TC74
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CS
Electrical Specifications: Unless otherwise noted, VDD = 3.3V for TC74AX-3.3VXX and VDD = 5.0V for TC74AX-5.0VXX, -40°C ≤ TA ≤ 125°C. Note 5 Parameters Power Supply Power-on Reset Threshold Supply Voltage Operating Current Standby Supply Current Temperature-to-Bits Converter Temperature Accuracy TERR -2.0 -3.0 — 4 0.8 x VDD — — — — -1.0 10 4.7 4.0 — — ±2.0 8 — — — — 5.0 0.1 — — — +2.0 +3.0 — — — 0.2 x V DD 0.4 0.6 — 1.0 100 — — °C +25°C <TA < +85°C 0°C < TA < +125°C -40°C < TA < 0°C Note 2 VPOR VDD IDD IDD-STANDBY 1.2 2.7 — — — — 200 5.0 2.2 5.5 350 10 V V µA µA VDD Falling Edge or Rising Edge Note 5 VDD = 5.5V, Note 1 VDD = 3.3V Serial Port Inactive, Note 4 Sym Min Typ Max Units Conditions
Applications
• Thermal Protection for Hard Disk Drives and other PC Peripherals • PC Card Devices for Notebook Computers • Low Cost Thermostat Controls • Power Supplies • Thermistor Replacement
TC74
General Description
The TC74 is a serially accessible, digital temperature sensor particularly suited for low cost and small formfactor applications. Temperature data is converted from the onboard thermal sensing element and made available as an 8-bit digital word. Communication with the TC74 is accomplished via a 2wire SMBus/I2C compatible serial port. This bus also can be used to implement multi-drop/multi-zone monitoring. The SHDN bit in the CONFIG register can be used to activate the low power Standby mode. Temperature resolution is 1°C. Conversion rate is a nominal 8 samples/sec. During normal operation, the quiescent current is 200 µA (typ). During standby operation, the quiescent current is 5 µA (typ). Small size, low installed cost and ease of use make the TC74 an ideal choice for implementing thermal management in a variety of systems.
Absolute Maximum Ratings†
Supply Voltage (VDD) ............................................ +6V Voltage On Any Pin ....... (GND – 0.3V) to (VDD + 0.3V) Current On Any Pin .......................................... ±50 mA Operating Temperature (TA) ........ -40°C ≤ TA ≤ +125°C Storage Temperature (TSTG) .............. -65°C to +150°C Junction Temperature (TJ)................................ +150°C
Conversion Rate Serial Port Interface Logic Input High Logic Input Low SDA Output Low Input Capacitance SDA, SCLK I/O Leakage SMBus/I2C Clock Frequency Low Clock Period High Clock Period
M
Tiny Serial Digital Thermal Sensor
Features
• Digital Temperature Sensing in SOT-23-5 or TO-220 Packages • Outputs Temperature as an 8-Bit Digital Word • Simple SMBus/I2C™ Serial Port Interface • Solid-State Temperature Sensing: - ±2°C (max.) Accuracy from +25°C to +85°C - ±3°C (max.) Accuracy from 0°C to +125°C • Supply Voltage of 2.7V to 5.5V • Low Power: - 200 µA (typ.) Operating Current - 5 µA (typ.) Standby Mode Current
CR VIH VIL VOL CIN ILEAK fSMB tLOW tHIGH
SPS V V V V pF µA kHz µsec µsec
IOL = 3 mA IOL = 6 mA, Note 3
Serial Port AC Timing (CLOAD = 80 pF) 10% to 10% 90% to 90%
Control
Logic
2002 Microchip Technology Inc.
NC SDA GND SCLK VDD
NC
Note: The TO-220 tab is connected to pin 3 (GND)
DS21462C-page 1
TC74
1.0
1.1
ELECTRICAL CHARACTERISTICS
Note 1: Operating current is an average value integrated over multiple conversion cycles. Transient current may exceed this specification. 2: Maximum ensured conversion time after Power-on Reset (POR to DATA_RDY) is 250 msec. 3: Output current should be minimized for best temperature accuracy. Power dissipation within the TC74 will cause self-heating and temperature drift error. 4: SDA and SCLK must be connected to VDD or GND. 5: VDD = 3.3V for TC74AX -3.3 VXX. VDD = 5.0V for TC74AX -5.0 VXX. All part types of the TC74 will operate properly over the wider power supply range of 2.7V to 5.5V. Each part type is tested and specified for rated accuracy at its nominal supply voltage. As VDD varies from the nominal value, accuracy will degrade 1°C/V of V DD change.
Functional Block Diagram
Package Types
TO-220 SDA 5 TC74
123 45
Internal Sensor (Diode)
SDA Serial Port Interface SCLK
SOT-23 SCLK 4 TC74 1 2 GND 3 VDD
Temperature Register ∆Σ Modulator
† Notice: Stresses above those listed under "Maximum Ratings" may cause permanent damage to the device. This is a stress rating only and functional operation of the device at those or any other conditions above those indicated in the operation listings of this specification is not implied. Exposure to maximum rating conditions for extended periods may affect device reliability.
DS21462C-page 2
2002 Microchip Technology Inc.
TC74
DC CHARACTERISTICS (CONTINUED)
Electrical Specifications: Unless otherwise noted, VDD = 3.3V for TC74AX-3.3VXX and VDD = 5.0V for TC74AX-5.0VXX, -40°C ≤ TA ≤ 125°C. Note 5 Parameters SMBus/I C Rise Time SMBus/I2C Fall Time START Condition Setup Time (for repeated START Condition) START Condition Hold Time Data In Setup Time Data In Hold Time STOP Condition Setup Time Bus Free Time Prior to New Transition Power-on Reset Delay
2
Sym tR tF tSU(START)
Min — — 4.0
Typ — — —
Max 1000 300 —
Units nsec nsec µsec
Conditions 10% to 90% 90% to10% 90% SCLK to 10% SDA
Electrical Specifications: Unless otherwise noted, VDD = 3.3V for TC74AX-3.3VXX and VDD = 5.0V for TC74AX-5.0VXX, -40°C ≤ TA ≤ 125°C. Note 5 Parameters Power Supply Power-on Reset Threshold Supply Voltage Operating Current Standby Supply Current Temperature-to-Bits Converter Temperature Accuracy TERR -2.0 -3.0 — 4 0.8 x VDD — — — — -1.0 10 4.7 4.0 — — ±2.0 8 — — — — 5.0 0.1 — — — +2.0 +3.0 — — — 0.2 x V DD 0.4 0.6 — 1.0 100 — — °C +25°C <TA < +85°C 0°C < TA < +125°C -40°C < TA < 0°C Note 2 VPOR VDD IDD IDD-STANDBY 1.2 2.7 — — — — 200 5.0 2.2 5.5 350 10 V V µA µA VDD Falling Edge or Rising Edge Note 5 VDD = 5.5V, Note 1 VDD = 3.3V Serial Port Inactive, Note 4 Sym Min Typ Max Units Conditions
Applications
• Thermal Protection for Hard Disk Drives and other PC Peripherals • PC Card Devices for Notebook Computers • Low Cost Thermostat Controls • Power Supplies • Thermistor Replacement
TC74
General Description
The TC74 is a serially accessible, digital temperature sensor particularly suited for low cost and small formfactor applications. Temperature data is converted from the onboard thermal sensing element and made available as an 8-bit digital word. Communication with the TC74 is accomplished via a 2wire SMBus/I2C compatible serial port. This bus also can be used to implement multi-drop/multi-zone monitoring. The SHDN bit in the CONFIG register can be used to activate the low power Standby mode. Temperature resolution is 1°C. Conversion rate is a nominal 8 samples/sec. During normal operation, the quiescent current is 200 µA (typ). During standby operation, the quiescent current is 5 µA (typ). Small size, low installed cost and ease of use make the TC74 an ideal choice for implementing thermal management in a variety of systems.
Absolute Maximum Ratings†
Supply Voltage (VDD) ............................................ +6V Voltage On Any Pin ....... (GND – 0.3V) to (VDD + 0.3V) Current On Any Pin .......................................... ±50 mA Operating Temperature (TA) ........ -40°C ≤ TA ≤ +125°C Storage Temperature (TSTG) .............. -65°C to +150°C Junction Temperature (TJ)................................ +150°C
Conversion Rate Serial Port Interface Logic Input High Logic Input Low SDA Output Low Input Capacitance SDA, SCLK I/O Leakage SMBus/I2C Clock Frequency Low Clock Period High Clock Period
M
Tiny Serial Digital Thermal Sensor
Features
• Digital Temperature Sensing in SOT-23-5 or TO-220 Packages • Outputs Temperature as an 8-Bit Digital Word • Simple SMBus/I2C™ Serial Port Interface • Solid-State Temperature Sensing: - ±2°C (max.) Accuracy from +25°C to +85°C - ±3°C (max.) Accuracy from 0°C to +125°C • Supply Voltage of 2.7V to 5.5V • Low Power: - 200 µA (typ.) Operating Current - 5 µA (typ.) Standby Mode Current
CR VIH VIL VOL CIN ILEAK fSMB tLOW tHIGH
SPS V V V V pF µA kHz µsec µsec
IOL = 3 mA IOL = 6 mA, Note 3
Serial Port AC Timing (CLOAD = 80 pF) 10% to 10% 90% to 90%
Control
Logic
2002 Microchip Technology Inc.
NC SDA GND SCLK VDD
NC
Note: The TO-220 tab is connected to pin 3 (GND)
DS21462C-page 1
TC74
1.0
1.1
ELECTRICAL CHARACTERISTICS
Note 1: Operating current is an average value integrated over multiple conversion cycles. Transient current may exceed this specification. 2: Maximum ensured conversion time after Power-on Reset (POR to DATA_RDY) is 250 msec. 3: Output current should be minimized for best temperature accuracy. Power dissipation within the TC74 will cause self-heating and temperature drift error. 4: SDA and SCLK must be connected to VDD or GND. 5: VDD = 3.3V for TC74AX -3.3 VXX. VDD = 5.0V for TC74AX -5.0 VXX. All part types of the TC74 will operate properly over the wider power supply range of 2.7V to 5.5V. Each part type is tested and specified for rated accuracy at its nominal supply voltage. As VDD varies from the nominal value, accuracy will degrade 1°C/V of V DD change.
Functional Block Diagram
Package Types
TO-220 SDA 5 TC74
123 45
Internal Sensor (Diode)
SDA Serial Port Interface SCLK
SOT-23 SCLK 4 TC74 1 2 GND 3 VDD
Temperature Register ∆Σ Modulator
† Notice: Stresses above those listed under "Maximum Ratings" may cause permanent damage to the device. This is a stress rating only and functional operation of the device at those or any other conditions above those indicated in the operation listings of this specification is not implied. Exposure to maximum rating conditions for extended periods may affect device reliability.
DS21462C-page 2
2002 Microchip Technology Inc.
TC74
DC CHARACTERISTICS (CONTINUED)
Electrical Specifications: Unless otherwise noted, VDD = 3.3V for TC74AX-3.3VXX and VDD = 5.0V for TC74AX-5.0VXX, -40°C ≤ TA ≤ 125°C. Note 5 Parameters SMBus/I C Rise Time SMBus/I2C Fall Time START Condition Setup Time (for repeated START Condition) START Condition Hold Time Data In Setup Time Data In Hold Time STOP Condition Setup Time Bus Free Time Prior to New Transition Power-on Reset Delay
2
Sym tR tF tSU(START)
Min — — 4.0
Typ — — —
Max 1000 300 —
Units nsec nsec µsec
Conditions 10% to 90% 90% to10% 90% SCLK to 10% SDA