BCL322522-R33M中文资料
常用三极管参数大全
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MAXIM MAX3221 MAX3223 MAX3243 说明书
_______________General DescriptionThe MAX3221/MAX3223/MAX3243 achieve 1µA supply current with Maxim’s revolutionary AutoShutdown™ fea-ture. When the MAX3221/MAX3223/MAX3243 do not sense a valid signal level on their receiver inputs, the on-board power supply and drivers shut down. This occurs if the RS-232 cable is disconnected or if the transmitters of the connected peripheral are turned off.The system turns on again when a valid level is applied to any RS-232 receiver input. As a result, the system saves power without changes to the existing BIOS or operating system.The MAX3221/MAX3223/MAX3243 transceivers are 3V-powered EIA/TIA-232 and V.28/V.24 communications interfaces intended for notebook computer applica-tions. A proprietary, high-efficiency, dual charge-pump power supply and a low-dropout transmitter combine to deliver true RS-232 performance from a single +3.0V to +5.5V supply. A guaranteed data rate of 120kbps pro-vides compatibility with popular software for communi-cating with personal computers.The MAX3221/MAX3223/MAX3243 require only 0.1µF capacitors in 3.3V operation, and can operate from input voltages ranging from +3.0V to +5.5V. They are ideal for 3.3V-only systems, mixed 3.3V and 5.0V systems, or 5.0V-only systems that require true RS-232 performance.The MAX3221 is a 1-driver/1-receiver 16-pin SSOP ver-sion of the 20-pin MAX3223 (2-driver/2-receiver). The MAX3243 3-driver/5-receiver, complete serial port is ideal for notebook or subnotebook computers. The MAX3243 includes one complementary always-active receiver. This receiver can monitor an external device (such as a modem) in shutdown, without forward bias-ing the protection diodes in a UART that may have V CC completely removed.Next Generation Device Features♦For Space-Constrained Applications:MAX3228/MAX3229: +2.5V to +5.5V RS-232Transceivers in UCSP™♦For Integrated ESD Protection:MAX3222E/MAX3232E/MAX3237E/MAX3241E*/MAX3246E: ±15kV ESD-Protected, Down to 10nA,3.0V to 5.5V, Up to 1Mbps, True RS-232Transceivers (MAX3246E Available in UCSP Package)♦For Low-Voltage or Data Cable Applications:MAX3380E/MAX3381E: +2.5V to +5.5V, 1µA, 2 Tx/2 Rx RS-232 Transceivers with ±15kV ESD-Protected I/O and Logic Pins________________________ApplicationsNotebook, Subnotebook, and Palmtop Computers Battery-Powered Equipment Hand-Held Equipment Peripherals PrintersMAX3221/MAX3223/MAX3243*1µA Supply-Current, True +3V to +5.5V RS-232 Transceivers with AutoShutdown________________________________________________________________Maxim Integrated Products119-0306; Rev 8; 10/03* Covered by U.S. Patent numbers 4,636,930; 4,679,134; 4,777,577; 4,797,899; 4,809,152; 4,897,774; 4,999,761; and other patents pending.†Future product—contact factory for availability.AutoShutdown and UCSP are trademarks of Maxim Integrated Products, Inc.Pin Configurations appear at end of data sheet.Typical Operating Circuits appear at end of data sheet._____________________Selector GuideFor pricing, delivery, and ordering information,please contact Maxim/Dallas Direct!at 1-888-629-4642, or visit Maxim’s website at .M A X 3221/M A X 3223/M A X 32431µA Supply-Current, True +3V to +5.5V RS-232 Transceivers with AutoShutdown 2_______________________________________________________________________________________ABSOLUTE MAXIMUM RATINGSELECTRICAL CHARACTERISTICS(V CC = +3.0V to +5.5V, C1–C4 = 0.1µF (Note 2), T A = T MIN to T MAX , unless otherwise noted. Typical values are at T A = +25°C.)Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.V CC ...........................................................................-0.3V to +6V V+ (Note 1)...............................................................-0.3V to +7V V- (Note 1)...............................................................+0.3V to -7V V+ + |V-|(Note 1).................................................................+13V Input VoltagesT_IN, FORCEOFF , FORCEON, EN (MAX3223)......-0.3V to +6V R_IN...................................................................................±25V Output VoltagesT_OUT.............................................................................±13.2V R_OUT, INVALID ......................................-0.3V to (V CC + 0.3V)Short-Circuit DurationT_OUT......................................................................Continuous Continuous Power Dissipation (T A = +70°C)16-Pin SSOP (derate 7.14mW/°C above +70°C)...........571mW 16-Pin TSSOP (derate 6.70mW/°C above +70°C).........533mW 20-Pin Plastic DIP (derate 11.11mW/°C above +70°C)....889mW 20-Pin SSOP (derate 8.00mW/°C above +70°C)...........640mW 20-Pin TSSOP DIP (derate 7.00mW/°C above +70°C).....559mW 28-Pin Wide SO (derate 12.50mW/°C above +70°C)............1W 28-Pin SSOP (derate 9.52mW/°C above +70°C)...........762mW 28-Pin TSSOP (derate 8.70mW/°C above +70°C).........696mW Operating Temperature RangesMAX32_ _C_ _.......................................................0°C to +70°C MAX32_ _E_ _....................................................-40°C to +85°C Storage Temperature Range.............................-65°C to +150°C Lead Temperature (soldering, 10s).................................+300°CNote 1:V+ and V- can have maximum magnitudes of 7V, but their absolute difference cannot exceed 13V.1µA Supply-Current, True +3V to +5.5V RS-232 Transceivers with AutoShutdown_______________________________________________________________________________________3ELECTRICAL CHARACTERISTICS (continued)(V CC = +3.0V to +5.5V, C1–C4 = 0.1µF (Note 2), T A = T MIN to T MAX , unless otherwise noted. Typical values are at T A = +25°C.)Note 2:C1–C4 = 0.1µF, tested at 3.3V ±10%. C1 = 0.047µF, C2–C4 = 0.33µF, tested at 5.0V ±10%.M A X 3221/M A X 3223/M A X 32431µA Supply-Current, True +3V to +5.5V RS-232 Transceivers with AutoShutdown 4_________________________________________________________________________________________________________________________________Typical Operating Characteristics(V CC = +3.3V, 235kbps data rate, 0.1µF capacitors, all transmitters loaded with 3k Ω, T A = +25°C, unless otherwise noted.)-6-5-4-3-2-101234560MAX3221/MAX3223TRANSMITTER OUTPUT VOLTAGEvs. LOAD CAPACITANCELOAD CAPACITANCE (pF)T R A N S M I T T E R O U T P U T V O L T A G E (V )20003000100040005000246810121416182022150500MAX3221/MAX3223SLEW RATEvs. LOAD CAPACITANCELOAD CAPACITANCE (pF)S L E W R A T E (V /µs )2000300010004000500051015202530354005101520253035MAX3221/MAX3223SUPPLY CURRENT vs. LOAD CAPACITANCEWHEN TRANSMITTING DATALOAD CAPACITANCE (pF)M A X 3223 S U P P L Y C U R R E N T (m A )M A X 3221 S U P P L Y C U R R E N T (m A )20003000100040005000-7.5-5.0-2.502.55.07.50MAX3243TRANSMITTER OUTPUT VOLTAGEvs. LOAD CAPACITANCELOAD CAPACITANCE (pF)T R A N S M I T T E R O U T P U T V O L T A G E (V )2000300010004000500046810121416182022240MAX3243SLEW RATEvs. LOAD CAPACITANCELOAD CAPACITANCE (pF)S L E W R A T E (V /µs )20003000100040005000510152025303545400MAX3243SUPPLY CURRENT vs. LOADCAPACITANCE WHEN TRANSMITTING DATALOAD CAPACITANCE (pF)S U P P L Y C U R R E N T (m A )20003000100040005000MAX3221/MAX3223/MAX32431µA Supply-Current, True +3V to +5.5V RS-232 Transceivers with AutoShutdown_______________________________________________________________________________________5______________________________________________________________Pin DescriptionLapLink is a trademark of Traveling Software._______________Detailed DescriptionDual Charge-Pump Voltage ConverterThe MAX3221/MAX3223/MAX3243’s internal power supply consists of a regulated dual charge pump that provides output voltages of +5.5V (doubling charge pump) and -5.5V (inverting charge pump), regardless of the input voltage (V CC ) over the +3.0V to +5.5V range. The charge pumps operate in a discontinuous mode: if the output voltages are less than 5.5V, the charge pumps are enabled; if the output voltages exceed 5.5V, the charge pumps are disabled. Each charge pump requires a flying capacitor (C1, C2) and a reservoir capacitor (C3, C4) to generate the V+ and V- supplies.RS-232 TransmittersThe transmitters are inverting level translators that con-vert CMOS-logic levels to 5.0V EIA/TIA-232 levels. They guarantee a 120kbps data rate with worst-case loads of 3k Ωin parallel with 1000pF, providing compatibility with PC-to-PC communication software (such as Laplink™).Typically, the MAX3221/MAX3223/MAX3243 can oper-ate at data rates of 235kbps. Transmitters can be paral-leled to drive multiple receivers or mice (MAX3243).Figure 1 shows a complete system connection.When FORCEOFF is driven to ground, or the Auto-Shutdown circuitry senses invalid voltage levels at all receiver inputs, the transmitters are disabled and the outputs are forced into a high-impedance state.M A X 3221/M A X 3223/M A X 32431µA Supply-Current, True +3V to +5.5V RS-232 Transceivers with AutoShutdown 6_______________________________________________________________________________________RS-232 ReceiversThe MAX3221/MAX3223/MAX3243’s receivers convert RS-232 signals to CMOS-logic output levels. All receivers have one inverting three-state output. In shut-down (FORCEOFF = low) or in AutoShutdown, the MAX3221/MAX3223’s receivers are active (Table 1).Driving EN high places the receiver(s) in a high-imped-ance state. The MAX3243’s receivers are high imped-ance when the part is shut down.The MAX3243 has an always-active complementary output (R2OUTB). R2OUTB is an extra output that mon-itors receiver activity while the other receivers are high impedance. This allows Ring Indicator to be monitored without forward biasing other devices connected to the receiver outputs. This is ideal for systems where V CC is set to 0V in shutdown to accommodate peripherals,such as UARTs (Figure 2).Figure 1. Interface Under Control of PMUFigure 2. The MAX3243 detects RS-232 activity when the UART and interface are shut down.MAX3221/MAX3223/MAX32431µA Supply-Current, True +3V to +5.5V RS-232 Transceivers with AutoShutdown_______________________________________________________________________________________7AutoShutdownA 1µA supply current is achieved with Maxim’s new AutoShutdown feature, which operates when FORCEON is low and FORCEOFF is high. When the MAX3221/MAX3223/MAX3243 sense no valid signal levels on all receiver inputs for 30µs, the on-board power supply and drivers are shut off, reducing supply current to 1µA. This occurs if the RS-232 cable is dis-connected or the connected peripheral transmitters are turned off. The system turns on again when a valid level is applied to any RS-232 receiver input. As a result, the system saves power without changes to the existing BIOS or operating system. When using AutoShutdown,the INVALID output is high when the device is on and low when the device is shut down. Because I NVALID indicates the receiver inputs’ condition, it can be used in any mode (Figure 3).Table 2 and Figure 3c summarize the MAX3221/MAX3223/MAX3243operating modes. FORCEON and FORCEOFF override the automatic circuitry and force the transceiver into its normal operating state or into its low-power standby state. When neither control is assert-ed, the IC selects between these states automatically based on receiver input levels. Figures 3a, 3b, and 5a depict valid and invalid RS-232 receiver levels.A mouse or other system with AutoShutdown may need time to wake up. Figure 4 shows a circuit that forces the transmitters on for 100ms, allowing enough time for theFigure 3a. MAX32_ _ Entering 1µA Supply Mode via AutoShutdown*Note:If the part is in AutoShutdown mode (FORCEOFF = V CC ,FORCEON = GND), it is shut down if no valid RS-232levels are present on all receiver inputs.Figure 4. AutoShutdown with Initial Turn-On to Wake Up a Mouse or Another SystemM A X 3221/M A X 3223/M A X 32431µA Supply-Current, True +3V to +5.5V RS-232 Transceivers with AutoShutdown 8_______________________________________________________________________________________other system to realize that the MAX3221/MAX3223/MAX3243is awake. If the other system outputs valid RS-232 signals within that time, the RS-232 ports on both systems remain enabled.When shut down, the device’s charge pumps are turned off, V+ decays to V CC , V- decays to ground, and the transmitter outputs are disabled (high impedance). The time required to exit shutdown is typically 100µs (Figure 5b).Software-Controlled ShutdownIf direct software control is desired, INVALID can be used to indicate DTR or Ring Indicator signal. Tie FORCEOFF and FORCEON together to bypass Auto-Shutdown so the line acts like a SHDN input.___________Applications InformationCapacitor SelectionThe capacitor type used for C1–C4 is not critical for proper operation; either polarized or nonpolarized capacitors may be used. The charge pump requires 0.1µF capacitors for 3.3V operation. For other supply voltages, refer to Table 3 for required capacitor values.Do not use values smaller than those listed in Table 3.Increasing the capacitor values (e.g., by a factor of 2)reduces ripple on the transmitter outputs and slightly reduces power consumption. C2, C3, and C4 can be increased without changing C1’s value. However, do not increase C1 without also increasing the values of C2, C3, and C4 to maintain the proper ratios (C1to the other capacitors).When using the minimum required capacitor values,make sure the capacitor value does not degrade excessively with temperature. If in doubt, use capaci-tors with a larger nominal value. The capacitor’s equiva-lent series resistance (ESR) usually rises at low temperatures and influences the amount of ripple on V+ and V-.Table 2. AutoShutdown LogicRS-232 SIGNAL PRESENT AT RECEIVER INPUTF O R C E O F F INPUTFORCEON INPUTI N V A L I D OUTPUTTRANSCEIVER STATUSYes H X H Normal OperationNo H H L Normal Operation (Forced On)No H L L Shutdown (AutoShutdown)Yes L X H Shutdown (Forced Off)NoLXLShutdown (Forced Off)Figure 5. AutoShutdown Trip LevelsMAX3221/MAX3223/MAX32431µA Supply-Current, True +3V to +5.5V RS-232 Transceivers with AutoShutdown_______________________________________________________________________________________9Power-Supply DecouplingIn most circumstances a 0.1µF bypass capacitor is adequate. In applications that are sensitive to power-supply noise, decouple V CC to ground with a capacitor of the same value as the charge-pump capacitor C1.Connect bypass capacitors as close to the IC as possible.Transmitter Outputs when Exiting ShutdownFigure 6 shows two transmitter outputs when exiting shutdown mode. As they become active, the two trans-mitter outputs are shown going to opposite RS-232levels. Each transmitter is loaded with 3k Ωin parallel with 2500pF. The transmitter outputs display no ringing or undesirable transients as they come out of shut-down. Note that the transmitters are enabled only when the magnitude of V- exceeds approximately 3V. Figure 7a shows the MAX3243’s transmitter output voltage vs. current per transmitter. Figure 7b is a mouse driver test circuit.Mouse Driveability (MAX3243)The MAX3243 has been specifically designed to power serial mice while operating from low-voltage power sup-plies. It has been tested with samples of ten major mouse models from six manufacturers including the leading three: Logitech (5 models), Mouse Systems, andMicrosoft. The MAX3243 successfully drove all serial mice and met their respective current and voltage requirements. Figure 7a shows the transmitter outputs under increasing load current. The MAX3243’s switching regulator ensures the transmitters will supply at least ±5V during worst-case conditions. The AutoShutdown feature does not work with a mouse, so FORCEOFF and FORCEON should be connected to V CC .High Data RatesThe MAX3221/MAX3223/MAX3243 maintain the RS-232±5.0V minimum transmitter output voltage even at high data rates. Figure 8 shows a transmitter loopback test circuit. Figure 9 shows a loopback test result at 120kbps, and Figure 10 shows the same test at 235kbps. For Figure 9, all three transmitters were driv-en simultaneously at 120kbps into RS-232 loads in par-allel with 1000pF. For Figure 10, a single transmitter was driven at 235kbps, but all three transmitters were loaded with an RS-232 receiver in parallel with 1000pF.Interconnection with 3V and 5V LogicThe MAX3221/MAX3223/MAX3243 can directly inter-face with various 5V logic families, including ACT and HCT CMOS. See Table 4 for more information on possi-ble combinations of interconnections.Figure 7a. MAX3243 Transmitter Output Voltage vs. Load Current per Transmitter5V/divV CC = +3.3V C1–C4 = 0.1µF2V/divT250µs/divT1Figure 6. Transmitter Outputs when Exiting Shutdown or Powering UpM A X 3221/M A X 3223/M A X 32431µA Supply-Current, True +3V to +5.5V RS-232 Transceivers with AutoShutdown 10______________________________________________________________________________________MAX3221/MAX3223/MAX32431µA Supply-Current, True +3V to +5.5V RS-232 Transceivers with AutoShutdown______________________________________________________________________________________11Figure 10. Loopback Test Result at 235kbpsT1INR1OUTV CC = +3.3V, 235kbps C1–C4 = 0.1µFT1OUT 5V/div5V/div2µs/div5V/divM A X 3221/M A X 3223/M A X 32431µA Supply-Current, True +3V to +5.5V RS-232 Transceivers with AutoShutdown__________________________________________________Typical Operating CircuitsMAX3221/MAX3223/MAX32431µA Supply-Current, True +3V to +5.5V RS-232 Transceivers with AutoShutdown______________________________________________________________________________________13______3V-Powered EIA/TIA-232 and EIA/TIA-562 Transceivers from MaximM A X 3221/M A X 3223/M A X 32431µA Supply-Current, True +3V to +5.5V RS-232 Transceivers with AutoShutdown 14________________________________________________________________________________________________________________________________________________Pin Configurations___________________Chip InformationMAX3221TRANSISTOR COUNT: 269MAX3223TRANSISTOR COUNT: 339MAX3243TRANSISTOR COUNT: 476MAX3221/MAX3223/MAX32431µA Supply-Current, True +3V to +5.5V RS-232 Transceivers with AutoShutdown______________________________________________________________________________________15Package Information(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,go to /packages .)M A X 3221/M A X 3223/M A X 32431µA Supply-Current, True +3V to +5.5V RS-232 Transceivers with AutoShutdown S O I C W .E P SPACKAGE OUTLINE, .300" SOIC1121-0042BREV.DOCUMENT CONTROL NO.APPROVALPROPRIETARY INFORMATION TITLE:TOP VIEWFRONT VIEWMAX 0.0120.1040.0190.2990.013INCHES0.2910.009E C DIM 0.0140.004B A1MIN0.093A 0.237.407.600.32MILLIMETERS 0.100.352.35MIN0.490.30MAX 2.650.0500.016L 0.401.270.5120.496D D MIN DIM D INCHESMAX 12.6013.00MILLIMETERS MIN MAX 20AC 0.4470.463AB 11.7511.35180.3980.413AA 10.5010.1016N MS013SIDE VIEWH 0.4190.39410.0010.65e 0.050 1.27D 0.6140.59815.202415.60AD D 0.7130.69717.702818.10AEHE NDA1BeA0∞-8∞CL1VARIATIONS:P D P N E P SMaxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses areimplied. Maxim reserv____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600Package Information (continued)(The packag/packages。
MAX3232中文资料.pdf
MAX3222/MAX3232/MAX3237/MAX32413.0V至5.5V、低功耗、1Mbps、真RS-232收发器，使用四只0.1µF外部电容________________________________________________________________Maxim Integrated Products119-0273; Rev 7; 1/07MegaBaud和UCSP是Maxim Integrated Products, Inc.的商标。
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M A X 3222/M A X 3232/M A X 3237/M A X 32413.0V至5.5V、低功耗、1Mbps、真RS-232收发器，使用四只0.1µF外部电容2_______________________________________________________________________________________ABSOLUTE MAXIMUM RATINGSELECTRICAL CHARACTERISTICS(V CC = +3.0V to +5.5V, C1–C4 = 0.1µF (Note 2), T A = T MIN to T MAX , unless otherwise noted. Typical values are at T A = +25°C.)Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.Note 1:V+ and V- can have a maximum magnitude of 7V, but their absolute difference cannot exceed 13V.V CC ...........................................................................-0.3V to +6V V+ (Note 1)...............................................................-0.3V to +7V V- (Note 1)................................................................+0.3V to -7V V+ + V- (Note 1)...................................................................+13V Input VoltagesT_IN, SHDN , EN ...................................................-0.3V to +6V MBAUD...................................................-0.3V to (V CC + 0.3V)R_IN.................................................................................±25V Output VoltagesT_OUT...........................................................................±13.2V R_OUT....................................................-0.3V to (V CC + 0.3V)Short-Circuit DurationT_OUT....................................................................ContinuousContinuous Power Dissipation (T A = +70°C)16-Pin TSSOP (derate 6.7mW/°C above +70°C).............533mW 16-Pin Narrow SO (derate 8.70mW/°C above +70°C)....696mW 16-Pin Wide SO (derate 9.52mW/°C above +70°C)........762mW 16-Pin Plastic DIP (derate 10.53mW/°C above +70°C)...842mW 18-Pin SO (derate 9.52mW/°C above +70°C)..............762mW 18-Pin Plastic DIP (derate 11.11mW/°C above +70°C)..889mW 20-Pin SSOP (derate 7.00mW/°C above +70°C).........559mW 20-Pin TSSOP (derate 8.0mW/°C above +70°C).............640mW 28-Pin TSSOP (derate 8.7mW/°C above +70°C).............696mW 28-Pin SSOP (derate 9.52mW/°C above +70°C).........762mW 28-Pin SO (derate 12.50mW/°C above +70°C).....................1W Operating Temperature RangesMAX32_ _C_ _.....................................................0°C to +70°C MAX32_ _E_ _ .................................................-40°C to +85°C Storage Temperature Range.............................-65°C to +150°C Lead Temperature (soldering, 10s).................................+300°CMAX3222/MAX3232/MAX3237/MAX32413.0V至5.5V、低功耗、1Mbps、真RS-232收发器，使用四只0.1µF外部电容_______________________________________________________________________________________3TIMING CHARACTERISTICS—MAX3222/MAX3232/MAX3241(V CC = +3.0V to +5.5V, C1–C4 = 0.1µF (Note 2), T A = T MIN to T MAX , unless otherwise noted. Typical values are at T A = +25°C.)ELECTRICAL CHARACTERISTICS (continued)(V CC = +3.0V to +5.5V, C1–C4 = 0.1µF (Note 2), T A = T MIN to T MAX , unless otherwise noted. Typical values are at T A = +25°C.)A X 3222/M A X 3232/M A X 3237/M A X 32413.0V至5.5V、低功耗、1Mbps、真RS-232收发器，使用四只0.1µF外部电容4_______________________________________________________________________________________典型工作特性Ω, T A = +25°C, unless otherwise noted.)LOAD CAPACITANCE (pF)0246810121416182022150MAX3222/MAX3232SLEW RATEvs. LOAD CAPACITANCELOAD CAPACITANCE (pF)S L E W R A T E (V /µs )20003000100040005000510152025303540MAX3222/MAX3232SUPPLY CURRENT vs. LOAD CAPACITANCEWHEN TRANSMITTING DATALOAD CAPACITANCE (pF)S U P P L Y C U R R E N T (m A )20003000100040005000TIMING CHARACTERISTICS—MAX3237(V CC = +3.0V to +5.5V, C1–C4 = 0.1µF (Note 2), T A = T MIN to T MAX , unless otherwise noted. Typical values are at T A = +25°C.)Note 2:MAX3222/MAX3232/MAX3241: C1–C4 = 0.1µF tested at 3.3V ±10%; C1 = 0.047µF, C2–C4 = 0.33µF tested at 5.0V ±10%.MAX3237: C1–C4 = 0.1µF tested at 3.3V ±5%; C1–C4 = 0.22µF tested at 3.3V ±10%; C1 = 0.047µF, C2–C4 = 0.33µF tested at 5.0V ±10%.Note 3:Transmitter input hysteresis is typically 250mV.MAX3222/MAX3232/MAX3237/MAX32413.0V至5.5V、低功耗、1Mbps、真RS-232收发器，使用四只0.1µF外部电容_______________________________________________________________________________________5-7.5-5.0-2.502.55.07.50MAX3241TRANSMITTER OUTPUT VOLTAGEvs. LOAD CAPACITANCELOAD CAPACITANCE (pF)T R A N S M I T T E R O U T P U T V O L T A G E (V )2000300010004000500046810121416182022240MAX3241SLEW RATEvs. LOAD CAPACITANCELOAD CAPACITANCE (pF)S L E W R A T E (V /µs )20003000100040005000510152025303545400MAX3241SUPPLY CURRENT vs. LOADCAPACITANCE WHEN TRANSMITTING DATALOAD CAPACITANCE (pF)S U P P L Y C U R R E N T (m A )20003000100040005000-7.5-5.0-2.502.55.07.50MAX3237TRANSMITTER OUTPUT VOLTAGE vs. LOAD CAPACITANCE (MBAUD = GND)LOAD CAPACITANCE (pF)T R A N S M I T T E R O U T P U T V O L T A G E (V )200030001000400050000102030504060700MAX3237SLEW RATE vs. LOAD CAPACITANCE(MBAUD = V CC )LOAD CAPACITANCE (pF)S L E W R A T E (V /µs )500100015002000-7.5-5.0-2.502.55.07.50MAX3237TRANSMITTER OUTPUT VOLTAGE vs. LOAD CAPACITANCE (MBAUD = V CC )LOAD CAPACITANCE (pF)T R A N S M I T T E R O U T P U T V O L T A G E (V )5001000150020001020304050600MAX3237SUPPLY CURRENT vs.LOAD CAPACITANCE (MBAUD = GND)LOAD CAPACITANCE (pF)S U P P L Y C U R R E N T (m A )200030001000400050000246810120MAX3237SLEW RATE vs. LOAD CAPACITANCE(MBAUD = GND)LOAD CAPACITANCE (pF)S L E W R A T E (V /µs )2000300010004000500010302040506070MAX3237SKEW vs. LOAD CAPACITANCE(t PLH - t PHL )LOAD CAPACITANCE (pF)1000150050020002500____________________________________________________________________典型工作特性(续)(V CC = +3.3V, 235kbps data rate, 0.1µF capacitors, all transmitters loaded with 3k Ω, T A = +25°C, unless otherwise noted.)M A X 3222/M A X 3232/M A X 3237/M A X 32413.0V至5.5V、低功耗、1Mbps、真RS-232收发器，使用四只0.1µF外部电容6_________________________________________________________________________________________________________________________________________________________________引脚说明MAX3222/MAX3232/MAX3237/MAX32413.0V至5.5V、低功耗、1Mbps、真RS-232收发器，使用四只0.1µF外部电容_______________________________________________________________________________________7_______________________________详细说明双电荷泵电压转换器MAX3222/MAX3232/MAX3237/MAX3241的内部电源由两路稳压型电荷泵组成，只要输入电压(V CC )在3.0V至5.5V范围以内，即可提供+5.5V (倍压电荷泵)和-5.5V (反相电荷泵)输出电压。
CF322522中文资料
10 1
100 10 DC CURRENT(m A)
1000 100
2. Typical Q vs. Frequency:
80
221K
60
100K R 47K
Q
4R 7K
40
101K
20 0 .1 1 10 100
F re q u e n c y (M H z)
SMD Molded Wire Wound Ferrite Chip Inductor P/N CF-322522 Series
C. Mechanical Drawing:
A
B
D
I
G
I H
C
F F
XXX
B
E
LAND PATTERN
D. General information:
1. Tolerance: M: ± 20%, L: ± 15%, K: ± 10%. 2. Operating Temperature: -25ºC TO +100ºC. 3. Storage Temperature: -40ºC TO +100ºC. 4. Temperature Rise: 20ºC Max. 5. Ambient temperature 80ºC Max. 6. Rated Current: Current cause inductance drops within 10% from 0ºC to 50ºC. 7. Resistance to solder heat: 260ºC for 10 seconds. 8. Inductance & Q measured using the HP4291B. 9. SRF measured using the HP8720D or HP8753E. 10. DCR measured using the 502BC. 11. Inductance range: From 0.12 uH to 220 uH. 12. SRF: From 7.0MHz to 500MHz. 13. RoHS compliant.
M25P32中文资料
M25P3232Mbit，低电压，75MHZ，SPI串行接口的flash存储器特征：32Mbit的flash。
单电源供电2.7~3.6V。
SPI总线通讯。
75M时钟（最大）VPP=9V快速读写电压页操作时间0.6ms擦出一个扇区时间0.6s整块擦除时间：标准23s，快速17s睡眠模式电流1uABP0,BP1,BP2硬件写保护选择位擦写次数可达100000次数据可保存20年目录1描述2信号描述数据输出数据输入时钟片选保护写保护,提高编程电压工作电压电源地3SPI协议4操作方法和时序页操作扇区的擦除和整块的擦写写检测和循环擦除快速编程和擦除操作激活，正常工作，睡眠模式状态寄存器保护方法保持条件5存储组织结构6操作说明写操作使能使能复位读器件ID读状态寄存器WIP位WEL位BP2,BP1,BP0位SRWD位写状态寄存器读数据操作快速读数据操作页操作扇区擦除操作整个器件擦除睡眠模式激活器件78原始状态9极限参数10DC和AC参数11硬件结构12编号13修订记录1 描述M25P32是32Mbit（4M*8）的串行flash存储器，具有增强写保护结构。
存取采用SPI 总线协议。
一次性可编程1-256个字节（参考页编程操作说明）。
增强型快速编程、擦除模式可适用于需要快速存储的场合。
当V PPH 达到写保护或增强编程电压时即可进入此模式。
存储结构分为64个扇区，每个含有256页，每页256字节的宽度，所以整个器件可以看成有16384页组成（或者4194304个字节组成）整个器件的擦除（参考整块擦除说明），一次擦除一个扇区（参考扇区擦除说明）图1表1图22信号描述串行数据输出（Q）串行数据输入（D）图31．DU = Don’t use2.3 串行时钟信号2.4片选（）当片选端输入为高时，那么取消选定器件，此时串行数据输出为高阻态，除非内部编程，循环对擦除、写寄存器进行操作，器件将工作在标准电源模式下（非睡眠模式）当器件片选信号拉低使能时，即器件进入正常工作模式。
12232液晶资料
Tr Tddr
V ih i V ili
Tdsw
Th
V a lid D a ta
Tc
MPU 写数据 MPU 读数据
V ih i V ili
串口读写时序：
7
林洋电子
七、软件初始化:
电源开启
延迟时间超过 40ms
RS RW D7 D6 D5 D4 D3 D2 D1 D0 0 0 0 0 1 1 X X XX
2
林洋电子
二、外形尺寸图
图1
2. 外形尺寸图
表1
项目 模块体积 视域 行列点阵数 点距离 点大小
正常尺寸 84×44×13 60.5×18.0 122×32 0.36×0.41 0.40×0.45
三.模块主要硬件构成说明
单位 mm mm DOTS mm mm
控制器接口信号说明：
结果 配合/W 进行写数据或指令 配合 R 进行读数据或指令
3
林洋电子
低/低——>高
无动作
● 忙标志:BF BF 标志提供内部工作情况.BF=1 表示模块在进行内部操作,此时模块不接受外部指令和数
据.BF=0 时,模块为准备状态,随时可接受外部指令和数据. 利用 STATUS RD 指令,可以将 BF 读到 DB7 总线,从而检验模块之工作状态.
林洋电子
9
DB2
10
DB3
11
DB4
12
DB5
13
DB6
14
DB7
15
BL+
16
BL-
H/L 数据线 H/L 数据线 H/L 数据线 H/L 数据线 H/L 数据线 H/L 数据线 VDD 背光源电压+4.2V－+5V Vss 背光源公共端
MAX323_datasheet
________________General DescriptionThe MAX3222/MAX3232/MAX3237/MAX3241 trans-ceivers have a proprietary low-dropout transmitter out-put stage enabling true RS-232 performance from a 3.0V to 5.5V supply with a dual charge pump. The devices require only four small 0.1µF external charge-pump capacitors. The MAX3222, MAX3232, and MAX3241 are guaranteed to run at data rates of 120kbps while maintaining RS-232 output levels. The MAX3237 is guaranteed to run at data rates of 250kbps in the normal operating mode and 1Mbps in the MegaBaud™ operating mode, while maintaining RS-232output levels.The MAX3222/MAX3232 have 2 receivers and 2 drivers. The MAX3222 features a 1µA shutdown mode that reduces power consumption and extends battery life in portable systems. Its receivers remain active in shutdown mode, allowing external devices such as modems to be monitored using only 1µA supply cur-rent. The MAX3222 and MAX3232 are pin, package,and functionally compatible with the industry-standard MAX242 and MAX232, respectively.The MAX3241 is a complete serial port (3 drivers/5 receivers) designed for notebook and subnotebook computers. The MAX3237 (5 drivers/3 receivers) is ideal for fast modem applications. Both these devices feature a shutdown mode in which all receivers can remain active while using only 1µA supply current. Receivers R1(MAX3237/MAX3241) and R2 (MAX3241) have extra out-puts in addition to their standard outputs. These extra outputs are always active, allowing external devices such as a modem to be monitored without forward bias-ing the protection diodes in circuitry that may have V CC completely removed.The MAX3222, MAX3237, and MAX3241 are available in space-saving TSSOP and SSOP packages.________________________ApplicationsNotebook, Subnotebook, and Palmtop Computers High-Speed ModemsHand-Held Equipment Peripherals Printers3.0V to 5.5V , Low-Power , up to 1Mbps, T rue RS-232Transceivers Using Four 0.1µF External CapacitorsMegaBaud and UCSP are trademarks of Maxim Integrated Products, Inc.Typical Operating Circuits appear at end of data sheet.MAX3222/MAX3232/ MAX3237/MAX3241捷多邦，您值得信赖的PCB打样专家！3.0V to 5.5V , Low-Power , up to 1Mbps, T rue RS-232Transceivers Using Four 0.1µF External CapacitorsABSOLUTE MAXIMUM RATINGSELECTRICAL CHARACTERISTICS(V CC = +3.0V to +5.5V, C1–C4 = 0.1µF (Note 2), T A = T MIN to T MAX , unless otherwise noted. Typical values are at T A = +25°C.)Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.Note 1:V+ and V- can have a maximum magnitude of 7V, but their absolute difference cannot exceed 13V.V CC ...........................................................................-0.3V to +6V V+ (Note 1)...............................................................-0.3V to +7V V- (Note 1)................................................................+0.3V to -7V V+ + V- (Note 1)...................................................................+13V Input VoltagesT_IN, SHDN , EN ...................................................-0.3V to +6V MBAUD...................................................-0.3V to (V CC + 0.3V)R_IN.................................................................................±25V Output VoltagesT_OUT...........................................................................±13.2V R_OUT....................................................-0.3V to (V CC + 0.3V)Short-Circuit DurationT_OUT....................................................................ContinuousContinuous Power Dissipation (T A = +70°C)16-Pin TSSOP (derate 6.7mW/°C above +70°C).............533mW 16-Pin Narrow SO (derate 8.70mW/°C above +70°C)....696mW 16-Pin Wide SO (derate 9.52mW/°C above +70°C)........762mW 16-Pin Plastic DIP (derate 10.53mW/°C above +70°C)...842mW 18-Pin SO (derate 9.52mW/°C above +70°C)..............762mW 18-Pin Plastic DIP (derate 11.11mW/°C above +70°C)..889mW 20-Pin SSOP (derate 7.00mW/°C above +70°C).........559mW 20-Pin TSSOP (derate 8.0mW/°C above +70°C).............640mW 28-Pin TSSOP (derate 8.7mW/°C above +70°C).............696mW 28-Pin SSOP (derate 9.52mW/°C above +70°C).........762mW 28-Pin SO (derate 12.50mW/°C above +70°C).....................1W Operating Temperature RangesMAX32_ _C_ _.....................................................0°C to +70°C MAX32_ _E_ _ .................................................-40°C to +85°C Storage Temperature Range.............................-65°C to +150°C Lead Temperature (soldering, 10s).................................+300°CMAX3222/MAX3232/MAX3237/MAX32413.0V to 5.5V , Low-Power , up to 1Mbps, T rue RS-232Transceivers Using Four 0.1µF External CapacitorsTIMING CHARACTERISTICS—MAX3222/MAX3232/MAX3241(V CC = +3.0V to +5.5V, C1–C4 = 0.1µF (Note 2), T A = T MIN to T MAX , unless otherwise noted. Typical values are at T A = +25°C.)ELECTRICAL CHARACTERISTICS (continued)(V CC = +3.0V to +5.5V, C1–C4 = 0.1µF (Note 2), T A = T MIN to T MAX , unless otherwise noted. Typical values are at T A = +25°C.)MAX3222/MAX3232/MAX3237/MAX32413.0V to 5.5V , Low-Power , up to 1Mbps, T rue RS-232Transceivers Using Four 0.1µF External Capacitors__________________________________________Typical Operating Characteristics(V CC = +3.3V, 235kbps data rate, 0.1µF capacitors, all transmitters loaded with 3k Ω, T A = +25°C, unless otherwise noted.)-6-5-4-3-2-101234560MAX3222/MAX3232TRANSMITTER OUTPUT VOLTAGEvs. LOAD CAPACITANCELOAD CAPACITANCE (pF)T R A N S M I T T E R O U T P U T V O L T A G E (V )20003000100040005000246810121416182022150MAX3222/MAX3232SLEW RATEvs. LOAD CAPACITANCELOAD CAPACITANCE (pF)S L E W R A T E (V /µs )20003000100040005000510152025303540MAX3222/MAX3232SUPPLY CURRENT vs. LOAD CAPACITANCEWHEN TRANSMITTING DATALOAD CAPACITANCE (pF)S U P P L Y C U R R E N T (m A )20003000100040005000TIMING CHARACTERISTICS—MAX3237(V CC = +3.0V to +5.5V, C1–C4 = 0.1µF (Note 2), T A = T MIN to T MAX , unless otherwise noted. Typical values are at T A = +25°C.)Note 2:MAX3222/MAX3232/MAX3241: C1–C4 = 0.1µF tested at 3.3V ±10%; C1 = 0.047µF, C2–C4 = 0.33µF tested at 5.0V ±10%.MAX3237: C1–C4 = 0.1µF tested at 3.3V ±5%; C1–C4 = 0.22µF tested at 3.3V ±10%; C1 = 0.047µF, C2–C4 = 0.33µF tested at 5.0V ±10%.Note 3:Transmitter input hysteresis is typically 250mV.MAX3222/MAX3232/MAX3237/MAX32413.0V to 5.5V , Low-Power , up to 1Mbps, T rue RS-232Transceivers Using Four 0.1µF External Capacitors-7.5-5.0-2.502.55.07.50MAX3241TRANSMITTER OUTPUT VOLTAGEvs. LOAD CAPACITANCELOAD CAPACITANCE (pF)T R A N S M I T T E R O U T P U T V O L T A G E (V )2000300010004000500046810121416182022240MAX3241SLEW RATEvs. LOAD CAPACITANCELOAD CAPACITANCE (pF)S L E W R A T E (V /µs )20003000100040005000510152025303545400MAX3241SUPPLY CURRENT vs. LOADCAPACITANCE WHEN TRANSMITTING DATALOAD CAPACITANCE (pF)S U P P L Y C U R R E N T (m A )20003000100040005000-7.5-5.0-2.502.55.07.50MAX3237TRANSMITTER OUTPUT VOLTAGE vs. LOAD CAPACITANCE (MBAUD = GND)LOAD CAPACITANCE (pF)T R A N S M I T T E R O U T P U T V O L T A G E (V )200030001000400050000102030504060700MAX3237SLEW RATE vs. LOAD CAPACITANCE(MBAUD = V CC )LOAD CAPACITANCE (pF)S L E W R A T E (V /µs )500100015002000-7.5-5.0-2.502.55.07.50MAX3237TRANSMITTER OUTPUT VOLTAGE vs. LOAD CAPACITANCE (MBAUD = V CC )LOAD CAPACITANCE (pF)T R A N S M I T T E R O U T P U T V O L T A G E (V )5001000150020001020304050600MAX3237SUPPLY CURRENT vs.LOAD CAPACITANCE (MBAUD = GND)LOAD CAPACITANCE (pF)S U P P L Y C U R R E N T(m A )200030001000400050000246810120MAX3237SLEW RATE vs. LOAD CAPACITANCE(MBAUD = GND)LOAD CAPACITANCE (pF)S L E W R A T E (V /µs )2000300010004000500010302040506070MAX3237SKEW vs. LOAD CAPACITANCE(t PLH - t PHL )LOAD CAPACITANCE (pF)1000150050020002500_____________________________Typical Operating Characteristics (continued)(V CC = +3.3V, 235kbps data rate, 0.1µF capacitors, all transmitters loaded with 3k Ω, T A = +25°C, unless otherwise noted.)MAX3222/MAX3232/MAX3237/MAX32413.0V to 5.5V , Low-Power , up to 1Mbps, T rue RS-232Transceivers Using Four 0.1µF External Capacitors______________________________________________________________Pin DescriptionMAX3222/MAX3232/MAX3237/MAX32413.0V to 5.5V , Low-Power , up to 1Mbps, T rue RS-232Transceivers Using Four 0.1µF External Capacitors_______________Detailed DescriptionDual Charge-Pump Voltage ConverterThe MAX3222/MAX3232/MAX3237/MAX3241’s internal power supply consists of a regulated dual charge pump that provides output voltages of +5.5V (doubling charge pump) and -5.5V (inverting charge pump), regardless of the input voltage (V CC ) over the 3.0V to 5.5V range. The charge pumps operate in a discontinuous mode; if the output voltages are less than 5.5V, the charge pumps are enabled, and if the output voltages exceed 5.5V, the charge pumps are disabled. Each charge pump requires a flying capacitor (C1, C2) and a reservoir capacitor (C3, C4) to generate the V+ and V- supplies.RS-232 TransmittersThe transmitters are inverting level translators that con-vert CMOS-logic levels to 5.0V EIA/TIA-232 levels.The MAX3222/MAX3232/MAX3241 transmitters guaran-tee a 120kbps data rate with worst-case loads of 3k Ωin parallel with 1000pF, providing compatibility with PC-to-PC communication software (such as LapLink™).Typically, these three devices can operate at data rates of 235kbps. Transmitters can be paralleled to drive multi-ple receivers or mice.The MAX3222/MAX3237/MAX3241’s output stage is turned off (high impedance) when the device is in shut-down mode. When the power is off, the MAX3222/MAX3232/MAX3237/MAX3241 permit the outputs to be driven up to ±12V.The transmitter inputs do not have pullup resistors.Connect unused inputs to GND or V CC .MAX3237 MegaBaud OperationIn normal operating mode (MBAUD = GND ), the MAX3237 transmitters guarantee a 250kbps data rate with worst-case loads of 3k Ωin parallel with 1000pF.This provides compatibility with PC-to-PC communica-tion software, such as Laplink.For higher speed serial communications, the MAX3237features MegaBaud operation. In MegaBaud operating mode (MBAUD = V CC ), the MAX3237 transmitters guar-antee a 1Mbps data rate with worst-case loads of 3k Ωin parallel with 250pF for 3.0V < V CC < 4.5V. For 5V ±10%operation, the MAX3237 transmitters guarantee a 1Mbps data rate into worst-case loads of 3k Ωin parallel with 1000pF.Figure 1. Slew-Rate Test CircuitsLapLink is a trademark of Traveling Software, Inc.MAX3222/MAX3232/MAX3237/MAX32413.0V to 5.5V , Low-Power , up to 1Mbps, T rue RS-232Transceivers Using Four 0.1µF External CapacitorsRS-232 ReceiversThe receivers convert RS-232 signals to CMOS-logic out-put levels. The MAX3222/MAX3237/MAX3241 receivers have inverting three-state outputs. In shutdown, the receivers can be active or inactive (Table 1).The complementary outputs on the MAX3237 (R1OUTB)and the MAX3241 (R1OUTB, R2OUTB) are always active,regardless of the state of EN or SHDN . This allows for Ring Indicator applications without forward biasing other devices connected to the receiver outputs. This is ideal for systems where V CC is set to 0V in shutdown to accommodate peripherals, such as UARTs (Figure 2).MAX3222/MAX3237/MAX3241Shutdown ModeSupply current falls to less than 1µA in shutdown mode (SHDN = low). When shut down, the device’s charge pumps are turned off, V+ is pulled down to V CC , V- is pulled to ground, and the transmitter outputs are dis-abled (high impedance). The time required to exit shut-down is typically 100µs, as shown in Figure 3. Connect SHDN to V CC if the shutdown mode is not used. SHDN has no effect on R_OUT or R_OUTB.MAX3222/MAX3237/MAX3241Enable ControlThe inverting receiver outputs (R_OUT) are put into a high-impedance state when EN is high. The complemen-tary outputs R1OUTB and R2OUTB are always active,regardless of the state of EN and SHDN (Table 1). EN has no effect on T_OUT.__________Applications InformationCapacitor SelectionThe capacitor type used for C1–C4 is not critical for proper operation; polarized or nonpolarized capacitors can be used. The charge pump requires 0.1µF capaci-tors for 3.3V operation. For other supply voltages, refer to Table 2 for required capacitor values. Do not use values lower than those listed in Table 2. Increasing the capaci-tor values (e.g., by a factor of 2) reduces ripple on the transmitter outputs and slightly reduces power consump-tion. C2, C3, and C4 can be increased without changing C1’s value. However, do not increase C1 without also increasing the values of C2, C3, and C4, to maintain the proper ratios (C1 to the other capacitors).When using the minimum required capacitor values,make sure the capacitor value does not degrade exces-sively with temperature. If in doubt, use capacitors with a higher nominal value. The capacitor’s equivalent series resistance (ESR), which usually rises at low tempera-tures, influences the amount of ripple on V+ and V-.Figure 2. Detection of RS-232 Activity when the UART and Interface are Shut Down; Comparison of MAX3237/MAX3241(b) with Previous Transceivers (a).MAX3222/MAX3232/MAX3237/MAX32413.0V to 5.5V , Low-Power , up to 1Mbps, T rue RS-232Transceivers Using Four 0.1µF External CapacitorsPower-Supply DecouplingIn most circumstances, a 0.1µF bypass capacitor is adequate. In applications that are sensitive to power-supply noise, decouple V CC to ground with a capacitor of the same value as charge-pump capacitor C1. Connect bypass capacitors as close to the IC as possible.Operation Down to 2.7VTransmitter outputs will meet EIA/TIA-562 levels of ±3.7V with supply voltages as low as 2.7V.Transmitter Outputs whenExiting ShutdownFigure 3 shows two transmitter outputs when exiting shutdown mode. As they become active, the two trans-mitter outputs are shown going to opposite RS-232 lev-els (one transmitter input is high, the other is low).Each transmitter is loaded with 3k Ωin parallel with 2500pF. The transmitter outputs display no ringing or undesirable transients as they come out of shutdown.Note that the transmitters are enabled only when the magnitude of V- exceeds approximately 3V.Mouse DriveabilityThe MAX3241 has been specifically designed to power serial mice while operating from low-voltage power sup-plies. It has been tested with leading mouse brands from manufacturers such as Microsoft and Logitech. The MAX3241 successfully drove all serial mice tested and met their respective current and voltage requirements.Figure 4a shows the transmitter output voltages under increasing load current at 3.0V. Figure 4b shows a typical mouse connection using the MAX3241.CC = 3.3V C1–C4 = 0.1µF50µs/divFigure 3. Transmitter Outputs when Exiting Shutdown or Powering UpMAX3222/MAX3232/MAX3237/MAX32413.0V to 5.5V , Low-Power , up to 1Mbps, T rue RS-232Transceivers Using Four 0.1µF External CapacitorsFigure 4b. Mouse Driver Test CircuitFigure 4a. MAX3241 Transmitter Output Voltage vs. Load Current per TransmitterMAX3222/MAX3232/MAX3237/MAX32413.0V to 5.5V, Low-Power, up to 1Mbps, T rue RS-232Transceivers Using Four 0.1µF External CapacitorsHigh Data RatesThe MAX3222/MAX3232/MAX3241 maintain the RS-232±5.0V minimum transmitter output voltage even at highdata rates. Figure 5 shows a transmitter loopback testcircuit. Figure 6 shows a loopback test result at120kbps, and Figure 7 shows the same test at 235kbps.For Figure 6, all transmitters were driven simultaneouslyat 120kbps into RS-232 loads in parallel with 1000pF.For Figure 7, a single transmitter was driven at 235kbps,and all transmitters were loaded with an RS-232 receiverin parallel with 1000pF.The MAX3237 maintains the RS-232 ±5.0V minimumtransmitter output voltage at data rates up to 1Mbps.Figure 8 shows a loopback test result at 1Mbps withMBAUD = V CC. For Figure 8, all transmitters wereloaded with an RS-232 receiver in parallel with 250pF.CC = 3.3V5µs/divFigure 5. Loopback Test CircuitFigure 6. MAX3241 Loopback Test Result at 120kbpsCC = 3.3V2µs/divFigure 7. MAX3241 Loopback Test Result at 235kbps0V +5V 0V -5V +5V 0VT_INT_OUT = R_IN5kR_OUT150pF200ns/divCC = 3.3VFigure 8. MAX3237 Loopback Test Result at 1000kbps(MBAUD = V CC)MAX3222/MAX3232/MAX3237/MAX32413.0V to 5.5V , Low-Power , up to 1Mbps, T rue RS-232Transceivers Using Four 0.1µF External Capacitors__________________________________________________Typical Operating CircuitsInterconnection with 3V and 5V LogicThe MAX3222/MAX3232/MAX3237/MAX3241 can directly interface with various 5V logic families, includ-ing ACT and HCT CMOS. See Table 3 for more informa-tion on possible combinations of interconnections.Table 3. Logic-Family Compatibility with Various Supply VoltagesMAX3222/MAX3232/MAX3237/MAX3241MAX3222/MAX3232/MAX3237/MAX3241 3.0V to 5.5V, Low-Power, up to 1Mbps, T rue RS-232Transceivers Using Four 0.1µF External Capacitors_____________________________________Typical Operating Circuits (continued)MAX3222/MAX3232/MAX3237/MAX32413.0V to 5.5V, Low-Power, up to 1Mbps, T rue RS-232 Transceivers Using Four 0.1µF External Capacitors_____________________________________________Pin Configurations (continued)3.0V to 5.5V , Low-Power , up to 1Mbps, T rue RS-232Transceivers Using Four 0.1µF External Capacitors______3V-Powered EIA/TIA-232 and EIA/TIA-562 Transceivers from MaximOrdering Information (continued)*Dice are tested at T A = +25°C, DC parameters only.+Denotes lead-free package.MAX3222/MAX3232/MAX3237/MAX32413.0V to 5.5V , Low-Power , up to 1Mbps, T rue RS-232Transceivers Using Four 0.1µF External Capacitors___________________Chip Topography___________________Chip InformationT1INT2IN 0.127"(3.225mm)0.087"(2.209mm)R2OUTR2IN T2OUTV CCV+C1+SHDNENC1- C2+C2-V-MAX3222TRANSISTOR COUNT: 339SUBSTRATE CONNECTED TO GNDMAX3222/MAX3232/MAX3237/MAX32413.0V to 5.5V , Low-Power , up to 1Mbps, T rue RS-232Transceivers Using Four 0.1µF External CapacitorsPackage Information(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,go to /packages .)Revision HistoryPages changed at Rev 7: 1, 15, 16, 17MAX3222/MAX3232/MAX3237/MAX3241Maxim Integrated 160 Rio Robles, San Jose, CA 95134 USA 1-408-601-1000Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and max limits) shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance.©2007 Maxim IntegratedThe Maxim logo and Maxim Integrated are trademarks of Maxim Integrated Products, Inc.。
常用三极管参数大全
玉林万顺达电脑芯片级维修资料 2010-07-20整理玉林万顺达电脑芯片级维修资料 2010-07-20整理玉林万顺达电脑芯片级维修资料 2010-07-20整理玉林万顺达电脑芯片级维修资料 2010-07-20整理玉林万顺达电脑芯片级维修资料 2010-07-20整理玉林万顺达电脑芯片级维修资料 2010-07-20整理玉林万顺达电脑芯片级维修资料 2010-07-20整理玉林万顺达电脑芯片级维修资料 2010-07-20整理玉林万顺达电脑芯片级维修资料 2010-07-20整理玉林万顺达电脑芯片级维修资料 2010-07-20整理玉林万顺达电脑芯片级维修资料 2010-07-20整理玉林万顺达电脑芯片级维修资料 2010-07-20整理玉林万顺达电脑芯片级维修资料 2010-07-20整理玉林万顺达电脑芯片级维修资料 2010-07-20整理玉林万顺达电脑芯片级维修资料 2010-07-20整理玉林万顺达电脑芯片级维修资料 2010-07-20整理玉林万顺达电脑芯片级维修资料 2010-07-20整理玉林万顺达电脑芯片级维修资料 2010-07-20整理玉林万顺达电脑芯片级维修资料 2010-07-20整理玉林万顺达电脑芯片级维修资料 2010-07-20整理玉林万顺达电脑芯片级维修资料 2010-07-20整理玉林万顺达电脑芯片级维修资料 2010-07-20整理玉林万顺达电脑芯片级维修资料 2010-07-20整理玉林万顺达电脑芯片级维修资料 2010-07-20整理玉林万顺达电脑芯片级维修资料 2010-07-20整理玉林万顺达电脑芯片级维修资料 2010-07-20整理玉林万顺达电脑芯片级维修资料 2010-07-20整理玉林万顺达电脑芯片级维修资料 2010-07-20整理玉林万顺达电脑芯片级维修资料 2010-07-20整理玉林万顺达电脑芯片级维修资料 2010-07-20整理。
CMF商用电源ACP3225型号电源共模滤波器产品说明书
Common mode filters For power line ACP seriesACP3225 typeFEATURESimpedance.atible with high-density p ortable devices, which are always being made smaller and lighter, because the height has been reduced.APPLICATIONPART NUMBER CONSTRUCTIONCHARACTERISTICS SPECIFICATION TABLE*Temperature derating was considered for the rated current.Measurement equipmentEquivalent measurement equipment may be used.ACP3225-102-2PACP3225-501-2PACP3225-102-2P-T000Series nameL×W×H dimensions Impedance Number of linesPackaging styleInternal code3.2×2.5×1.9 mm(Ω) at 100MHzCommon mode impedance[at 100MHz]DC resistanceRated current *Rated voltageInsulation resistance Part No.(Ω)Tolerance (m Ω)typ.(m Ω)max.(A)max.(V)max.(M Ω)min.1000±25%50100 1.56010ACP3225-102-2P-T000500±25%4010026010ACP3225-501-2P-T000Measurement item Product No.ManufacturerCommon mode impedance 4991A Keysight T echnologies DC resistance 4338A Keysight T echnologies Insulation resistance 4339AKeysight TechnologiesIMPEDANCE VS. FREQUENCY CHARACTERISTICSMeasurement equipmentProduct No.Manufacturer4991A Keysight T echnologiesEquivalent measurement equipment may be used.SHAPE & DIMENSIONSRECOMMENDED LAND PATTERNCIRCUIT DIAGRAMRECOMMENDED REFLOW PROFILEPACKAGING STYLETEMPERATURE RANGE, INDIVIDUAL WEIGHT*For actual use, use within the temperature derating range shown in page 1/4 of this catalog.**The storage temperature range is for after the assembly.Dimensions in mmDimensions in mmT ype A B KACP3225(2.9)(3.6)(2.35)Package quantity1000 pcs/reelOperating temperature range*Storagetemperature range**Individualweight–40 to +85 °C–40 to +85 °C60 mgDimensions in mmREMINDERS FOR USING THESE PRODUCTSBefore using these products, be sure to request the delivery specifications.SAFETY REMINDERSPlease pay sufficient attention to the warnings for safe designing when using this products.The storage period is within 6 months. Be sure to follow the storage conditions (temperature: 5 to 40°C, humidity: 10 to 75% RH or less).If the storage period elapses, the soldering of the terminal electrodes may deteriorate.Do not use or store in locations where there are conditions such as gas corrosion (salt, acid, alkali, etc.).Before soldering, be sure to preheat components.The preheating temperature should be set so that the temperature difference between the solder temperature and chip temperature does not exceed 150°C.Soldering corrections after mounting should be within the range of the conditions determined in the specifications.If overheated, a short circuit, performance deterioration, or lifespan shortening may occur.When embedding a printed circuit board where a chip is mounted to a set, be sure that residual stress is not given to the chip due to the overall distortion of the printed circuit board and partial distortion such as at screw tightening portions.Self heating (temperature increase) occurs when the power is turned ON, so the tolerance should be sufficient for the set thermal design.Carefully lay out the coil for the circuit board design of the non-magnetic shield type.A malfunction may occur due to magnetic interference.Use a wrist band to discharge static electricity in your body through the grounding wire.Do not expose the products to magnets or magnetic fields.Do not use for a purpose outside of the contents regulated in the delivery specifications.The products listed on this catalog are intended for use in general electronic equipment (AV equipment, telecommunications equip-ment, home appliances, amusement equipment, computer equipment, personal equipment, office equipment, measurement equip-ment, industrial robots) under a normal operation and use condition.The products are not designed or warranted to meet the requirements of the applications listed below, whose performance and/or qual-ity require a more stringent level of safety or reliability, or whose failure, malfunction or trouble could cause serious damage to society,person or property.If you intend to use the products in the applications listed below or if you have special requirements exceeding the range or conditions set forth in the each catalog, please contact us.(1) Aerospace/aviation equipment(2) T ransportation equipment (cars, electric trains, ships, etc.)(3) Medical equipment(4) Power-generation control equipment (5) Atomic energy-related equipment (6) Seabed equipment(7) T ransportation control equipment(8) Public information-processing equipment (9) Military equipment(10) Electric heating apparatus, burning equipment (11) Disaster prevention/crime prevention equipment(12) Safety equipment(13) Other applications that are not considered general-purposeapplicationsWhen designing your equipment even for general-purpose applications, you are kindly requested to take into consideration securing pro-tection circuit/device or providing backup circuits in your equipment.REMINDERS。
PL3323中文_Adapter_7W_20130806
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Datasheet
PL3323
图 2 辅 绕组电压波形
基于内部的时序 制，辅 绕组的电压可以通过 连接于辅 绕组和 FB 之间的分压电阻采样得
到 在恒压工作模式中，内部误差放大器 采样 的电压进行调节，从而得到恒定的输 电压 在恒流工作模式中，不管系统的输 电压大小， 芯片会保持输 电流恒定
9.7 保护 能
PL3323 内置了多种保护 能，包括 逐周期限 流保护，VDD 钳 保护，软启 ， 压保护，短
路保护，开路保护，过压保护，过载保护等 当 PL3323 的 VDD 电压 降到 UVLO(ON)，或 者 VDD 电压 升到 OVP 阈值，芯片将不工作，
时会进入重启状态
V1.0 © 2013
0.050 8º
11 注意 项
聚元有权在任何时刻修改 产品信息，恕不另行通知 客户在 单前应确保产品信息的及时更新和完 整性
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压保护 过载保护
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Datasheet 3 管脚分布图
SOP-8的管脚图如 图所示
PL3323
4 管脚 述
管脚 VDD COMP FB CS DRAIN GND
述 芯片电源输入 误差放大器输 ，用于 路补偿 通过电阻分压连接到辅 绕组，该管脚用于检测输 信号并调节芯片的恒流/恒压 通过检测连接CS到地电阻的电压来反映原边电感电流 高压MOSFET的漏端，连接到变压器 芯片地
℃
7 结构框图
V1.0 © 2013
4
Datasheet
PL3323
8 电气特性
(无特殊说明， 测试条件 参数
3225石英晶振 26MHz晶振 10PF资料
BOOK OF MODIFICATIONNo.DATECONTENT OFMODIFICATIONREASON OFMODIFICATIONPAGE ITEM APPROVE02011/8/08INTIAL RELEASED 1234567891011121314151617181920P: 1/8NO. ECAB110811 Acknowledgement Book( Modle:( ECEC P/N: ( CUST P/N:XS-3225 26.000 MHz ) M26000C034 ))ReceiverPlease return one after acknowledgement Zhejiang East Crystal Electronic Co.,Ltd.Quality DepartmentNo. 555,Sec 2,Binhong Road,Jinhua Zhejiang CHINASale QC Technic Design王茵施俊妍潘春琴童思柯SPECIFICATION OF QUARTZ CRYSTAL UNITS1.HOLDER TYPE: XS-3225 26.000 MHz2.GENERAL2-1 FREQUENCY (F0) 26.000 MHz2-2 MODE OF OSCILLATION (Mn) FUNDAMENTAL) -20℃/+70℃2-3 OPERATION TEMPERATURE RANGE (T2-4 STORAGE TEMPERATURE RANGE (Ts) -40℃/+85℃2-5 TEST SET S&A 250B ANALYSIS SYSTEM2-6 DRIVE LEVEL (DL) 100±2μw2-7 LOADING CAPACITANCE (CL) 10pF3.ELECTRICAL CHARACTERISTICS(This test shall be performed under the condition of temperature at 25±3℃.)3-1 FREQUENCY TOLERANCE (△f) ±10ppm Max3-2 EQUIVALENT RESISTANCE (Rr) 40ΩMax/Series3-3 TEMPERATURE DRIFT (T C) ±10ppm/ Max -20℃/+70℃3-4 SHUNT CAPACITANCE (C0) <7.0pF3-5 INSULATION RESISTANCE 500MΩmin/DC100V±15V(Lead to lead ,case to lead)4.DIMENSIONS AND MARKING4-1 HOLDER TYPE XS-32254-2 DIMENSION (mm)DESIGN INSPECTION ZHEJIANG EAST CRYSTAL ELECTRONIC.CO.,LTD童思柯施俊妍QUARTZ CRYSTAL UNITS4-4 PACKING4-4-1 Dimensions of the tape4-4-2 Dimensions of the reel4-4-3 Packing and LabelP: 4/8No: ECAB110811Date: 2011/8/081 Reel=3000pcsBox type(Reel quantity) Box size(L×W×H) mmAtype(Reel x 5pcs max) Btype(Reel x 6~15pcs)Ctype(Reel x 16~30pcs)Dtype(Reel x 31~60pcs)200×200×140 200×200×255 395×200×255395×400×255Manufactory name: ZHEJIANG EAST CRYSTAL ELEC.CO.,LTDZHEJIANG EAST CRYSTAL ELECTRONIC.CO.,LTDDESIGNINSPECTION5-5.REFLOW(WAVE)SOLDERINGFollowing profile of heat stress is applied to resonator,then being place in the naturalcondition for 1 hour,resonator shall be measured.260±5℃ 10~20sec150~190℃ 120sec5-6.SOLDERING DIPTerminals/lead-wires of specimen shall be dipped into solder melter tankat +260℃±5℃ for 3 sec.Dipping depth shall be 2mm from the bottom of specimens body.(Afterapplying ROSIN FLUX) soldering portion shall be covered in over 95% ofTerminals/lead-wires dipped.5-7.HUMIDITYElectrical characteristics shall be satisfied after letting it alone at 65±2℃in humidity of 90~95% for 500 hours.5-8.STORAGE IN LOW TEMPRATUREElectrical characteristics shall be satisfied after letting it alone at -40±2℃for 500 hours.5-9.STORAGE IN HIGH TEMPRATUREElectrical characteristics shall be satisfied after letting it alone at 85±2℃for 500 hours.DESIGN INSPECTION ZHEJIANG EAST CRYSTAL ELECTRONIC.CO.,LTD童思柯施俊妍No.ItemsMaterials1 LID(Cap) Fe ALLOY2 PKG(Base)CERAMIC+Au PLATING 3 External Electrode Au PLATING 4 Conductive Adhesive Ag+Epoxy Resin 5 Internal Electrode Ag 6Element(Blank)SiO2No: ECAB110811 QUARTZ CRYSTAL UNITSDate:2011/8/086.Structure Illustration142563DESIGN INSPECTIONZHEJIANG EAST CRYSTAL ELECTRONIC.CO.,LTD童思柯施俊妍。
贴片电感3225
100 Inductance (µH) 50
47µH 22µH 10µH
10 5
1 0.5 1 1µH 0.1 current (mA)
500 1000
0.5
1
5 10 Frequency (MHz)
50 100
• All specifications are subject to change without notice.
Operating temperature range Storage temperature range –40 to +85°C –40 to +85°C [Unit of products]
NLC Series NLC3225 Type
(We currently recommend that you switch to the NLCV32 type.)
FLUX AND CLEANING Rosin-based flux is recommended. Cleaning Conditions
Solvent Time Please select the solvent of this product avoiding a strong acid and a strong alkali, and considering the environments. 2min max.
2.5±0.2
1.2 2
1.9±0.1
Weight: 50mg
2 1.2 Dimensions in mm
ELECTRICAL CHARACTERISTICS
MAX3223CDB中文资料
元器件交易网IMPORTANT NOTICETexas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications,enhancements, improvements, and other changes to its products and services at any time and to discontinueany product or service without notice. Customers should obtain the latest relevant information before placingorders and should verify that such information is current and complete. All products are sold subject to TI’s termsand conditions of sale supplied at the time of order acknowledgment.TI warrants performance of its hardware products to the specifications applicable at the time of sale inaccordance with TI’s standard warranty. Testing and other quality control techniques are used to the extent TIdeems necessary to support this warranty. Except where mandated by government requirements, testing of allparameters of each product is not necessarily performed.TI assumes no liability for applications assistance or customer product design. Customers are responsible fortheir products and applications using TI components. To minimize the risks associated with customer productsand applications, customers should provide adequate design and operating safeguards.TI does not warrant or represent that any license, either express or implied, is granted under any TI patent right,copyright, mask work right, or other TI intellectual property right relating to any combination, machine, or processin which TI products or services are used. Information published by TI regarding third–party products or servicesdoes not constitute a license from TI to use such products or services or a warranty or endorsement thereof.Use of such information may require a license from a third party under the patents or other intellectual propertyof the third party, or a license from TI under the patents or other intellectual property of TI.Reproduction of information in TI data books or data sheets is permissible only if reproduction is withoutalteration and is accompanied by all associated warranties, conditions, limitations, and notices. Reproductionof this information with alteration is an unfair and deceptive business practice. TI is not responsible or liable forsuch altered documentation.Resale of TI products or services with statements different from or beyond the parameters stated by TI for thatproduct or service voids all express and any implied warranties for the associated TI product or service andis an unfair and deceptive business practice. TI is not responsible or liable for any such statements.Mailing Address:Texas InstrumentsPost Office Box 655303Dallas, Texas 75265Copyright 2001, Texas Instruments Incorporated。
BC32维修手册
共页 (包括封面)
技术文件类别：说明书
文件编号：
技术文件名称：BC32 主板维修手册
版
本：V1.2
生效日期：
拟制 审核 批准
会签栏：部部部部部部部
部
部
部
闪电通讯
目录
1 INTRODUCTION ................................................................................................................................................... 3 1.1 概述 ....................................................................................................................................................... 3 1.2 FREQUENCY ALLOCATION AND ITS USE..................................................................................... 3
4 基带部分故障维修 ......................................................................................................................................... 19 4.1 产线前端故障 ..................................................................................................................................... 19 （1）无法下载......................................................................................................................................... 19 4.2 主板功能部分故障 ............................................................................................................................. 19 （1）LCD 显示部分................................................................................................................................... 19 （2）摄像头............................................................................................................................................. 20 （3）扬声器/听筒 ................................................................................................................................. 21 （4）振动马达 ....................................................................................................................................... 22 （5）麦克风 ........................................................................................................................................... 24 （6）耳机 ............................................................................................................................................... 25 (7)充电器 ............................................................................................................................................. 25 (8)U 盘 .................................................................................................................................................. 25
BC327中文资料
MOTOROLA
SEMICONDUCTOR TECHNICAL DATA
Amplifier nsistors
Order this document by BC327/D
PNP Silicon
COLLECTOR 1 2 BASE 3 EMITTER
BC327,-16,-25 BC328,-16,-25
–0.6
–0.4 IC = –300 mA –0.2 0 –0.01 IC = –10 mA –0.1 –1.0 –10 IB, BASE CURRENT (mA) –100 IC = –100 mA
–0.4
–0.2 VCE(sat) @ IC/IB = 10 0 –1.0 –10 –100 IC, COLLECTOR CURRENT (mA) –1000
A R P
SEATING PLANE
B
F
L K D
X X G H V
1
J
C N N
SECTION X–X
DIM A B C D F G H J K L N P R V
CASE 029–04 (TO–226AA) ISSUE AD
STYLE 17: PIN 1. COLLECTOR 2. BASE 3. EMITTER
Output Capacitance (VCB = –10 V, IE = 0, f = 1.0 MHz) Current – Gain — Bandwidth Product (IC = –10 mA, VCE = –5.0 V, f = 100 MHz) Cob fT — — 11 260 — — pF MHz
–1000
Figure 2. Active Region — Safe Operating Area
75232l 芯片参数
75232l 芯片参数1.引言概述部分的内容可参考以下示例：1.1 概述概述部分旨在对75232l芯片的基本信息进行简要介绍。
作为一款先进的集成电路芯片，75232l芯片在通信和数据传输领域发挥着重要作用。
本文将对其技术特点、应用范围以及优势进行详细阐述。
75232l芯片具有高性能和可靠性的特点，能够提供快速而稳定的数据传输功能。
其关键特性包括高速率传输、低功耗、多种通信接口支持等。
这些特性使得75232l芯片成为了许多领域中的首选解决方案，如工业自动化、通信设备等。
在本文的后续部分，将详细介绍75232l芯片的技术参数和关键功能。
同时，还将探讨其在实际应用中的应用案例，以帮助读者更好地了解该芯片的价值和优势。
通过对75232l芯片的全面介绍和分析，读者将能够了解到该芯片在通信和数据传输领域的重要性，并为相关行业的专业人士提供了一种选择合适的解决方案的参考。
在下一节中，将进一步展开介绍75232l芯片的具体结构和技术要点。
1.2 文章结构文章结构部分介绍了本文的组织结构和各部分的主要内容。
通过明确文章的结构安排，读者可以更好地理解整篇文章的框架，有助于观点的连贯性和逻辑性。
文章结构部分的内容如下所示：文章结构：本文分为引言、正文和结论三个部分。
引言部分主要包括概述、文章结构和目的三个方面。
首先，我们将简要介绍75232l芯片的背景和相关的基本概念，为读者提供必要的背景知识。
然后，我们将详细介绍本文的组织结构，以便读者可以清晰地了解每个部分的主要内容和目标。
最后，我们将明确本文的目的，以便读者能够理解我们编写本文的动机和期望达到的效果。
正文部分包括芯片参数要点1和芯片参数要点2两个小节。
在芯片参数要点1部分，我们将详细介绍75232l芯片的第一个关键参数，并解释其重要性和应用场景。
在芯片参数要点2部分，我们将继续介绍芯片的另一个关键参数，并讨论其与其他参数的关系和优化策略。
结论部分主要包括总结和展望两个方面。
驱动IC A3225规格书
OVP 电压门限对温度的变化
5
启动电流对温度的变化
A 3225
高精度原边反馈 LED 恒流功率开关
电流检测门限对温度的变化
内部结构框图
图 3 A3225 内部框图
6
A 3225
高精度原边反馈 LED 恒流功率开关
应用信息
A3225 是一款专用于 LED 照明的恒流驱动芯片， 采用专利的恒流架构和控制方法，芯片内部集成 600V 功率开关，只需要极少的外围组件就可以达 到优异的恒流特性。无需光耦及 TL431 反馈，系 统成本低。
490
500
510
mV
500
ns
200
ns
工作电流 IST IOP
FB 反馈 VFB
TDemag_Min ΔVCS/ΔIFB_up
Байду номын сангаас
启动电流 典型工作电流
FB 反馈电压阈值 最小退磁时间 线电压补偿比例
VCC= VCC_th - 1V FOP =40KHz
(注 6)
25
50
uA
1.5
mA
1
V
4
us
1.1
保证满足个别性能指标。电气参数定义了器件在工作范围内并且在保证特定性能指标的测试条件下的直流和交流电参数 规范。对于未给定上下限值的参数，该规范不予保证其精度，但其典型值合理反映了器件性能。
注 2：温度升高最大功耗一定会减小，这也是由 TJMAX, θJA,和环境温度 TA 所决定的。最大允许功耗为 PDMAX = (TJMAX TA)/ θJA 或是极限范围给出的数字中比较低的那个值。 注 3：人体模型，100pF 电容通过 1.5KΩ 电阻放电。
当输出出现 LED 短路或 LED 开路时，系统将自动 进入低功耗模式，同时不断检测负载状态，直到 故障解除。当故障解除后，系统自动恢复正常工 作。