HT9302

I
CMOS IN
HKS=VDD: On-hook state (PO=low). Except for HFI/HDI (hand-free/hold-line control input), other functions are all disabled.
HKS=VSS: Off-hook state (PO=high). The chip is in the standby mode and
ready to receive the key input.
This pin is a CMOS output structure, which by receiving HKS and HFO/HDO
signals, control the dialer to connect or disconnect the telephone line.
C o lu m n C4
R1 K ey R ow
R4
X1 D iv id e r
X2
.SM
K ey . u n c tio n E ncoder
E ncoder
D ebounce
C lo c k G e n e ra to r
C o n tro l
W RM C o u n te r
ADDRL
SRAM
OSCILLATOR resonator to the X1 and X2 terminals can implement the oscillator function. The
X2
O
oscillator is turned off in the standby mode, and is actuated whenever a key-
board entry is detected.
XMUTE
XMUTE is an NMOS open drain structure pulled to VSS during dialing signal O NMOS OUT transmission. Otherwise, it is an open circuit. The XMUTE is used to mute the
1
24
2
23
3
22
4
21
5
20
6
19
7
18
8
17
9
16
10
15
11
14
12
13
H T9302D 2 4 S K D IP -A
HDO R4 R3 R2 R1 M ODE D TM . PO HKS VDD H .O C LO C K
HT9302G simple version
C1 C2 C3 X1 X2 XM U TE VSS VDD
R1
1
2
R2
4
5
R3
7
8
R4
* /T
0
3
SA
6
.
9
P
#
R
H T9302G
C1 C2
R1
1
2
R2
4
5
R3
7
8
R4
* /T
0
C3 HKS
3
6
.
9
P
#
R
HT9302 Series
Pin Description
Pin Name
I/O
Internal Connection
Description
C1~C4 R1~R4
Selection Table
Function Part No. HT9302x HT9302A HT9302B HT9302C HT9302D HT9302G HT9302G
Lock Function (Pin Selection)
Ö Ö Ö Ö
¾
Hold Line
Hand Free
LCD Interface
These pins form a 4´4 keyboard matrix which can perform keyboard input detection and dialing specification setting functions. When on-hook (HKS=high) all the pins are set high. While off-hook the column group (C1~C4) remains low and the row group (R1~R4) is set high for key input detection. I/O CMOS IN/OUT An inexpensive single contact 4´4 keyboard can be used as an input device. Pressing a key connects a single column to a single row, and actuates the system oscillator that results in a dialing signal output. If more than two keys are pressed at the same time, no response occurs. The key-in debounce time is 20ms. Refer to the keyboard information for keyboard arrangement and to the functional description for dialing specification selection.
R4 R3 R2 R1 M ODE D TM . PO HKS VDD
HDI C1 C2 C3 C4 LO C K X1 X2 XM U TE VSS H .I
1
22
2
21
3
20
4
19
5
18
6
17
7
16
8
15
9
14
10
13
11
12
H T9302B 2 2 S K D IP -A
HDO R4 R3 R2 R1 M ODE D TM . PO HKS VDD H .O
D TM .
PO XM U TE
HKS H .I HDI HDO H .O M ODE
Pin Assignment
HT9302x normal version
C1 C2 C3 C4 LO C K X1 X2 XM U TE VSS
1
18
2
17
3
164155146
13
7
12
8
11
9
10
H T9302A 1 8 D IP -A
X1
I
The system oscillator consists of an inverter, a bias resistor and the necessary
load capacitor on chip. Connecting a standard 3.579545MHz crystal or ceramic
1
16
2
15
3
14
4
13
5
12
6
11
7
10
8
9
H T9302G 1 6 D IP -A
R4 R3 R2 R1 M ODE D TM . PO HKS
Rev. 1.20
2
September 30, 2002
Keyboard Information
H T 9 3 0 2 A /B /C /D
C1 C2 C3 C4
HT9302 Series
1-Memory/2-Memory Tone/Pulse Dialer
Features
Patent Number: 64097, 86474, 64529, 113235 (R.O.C.) 5424740 (U.S.A.)
· Universal specification · Operating voltage: 2.0V~5.5V · Low standby current · Low memory retention current: 0.1mA (typ.) · Tone/pulse switchable · Interface with LCD driver · 32 digits for redialing · 32 digits for SA memory dialing · One-key redialing · Pause and P®T key for PBX · 4´4 keyboard matrix · 3.58MHz crystal or ceramic resonator
speech circuit when transmitting the dial signal.
HKS
This pin is used to monitor the status of the hook-switch and its combination
with HFI/HDI can control the PO pin output to make or break the line.
C1 C2 C3 C4 LO C K X1 X2 XM U TE VSS DOUT
1
20
2
19
3
18
4
17
5
16
6
15
7
14
8
13
9
12
10
11
H T9302C 2 0 D IP -A
R4 R3 R2 R1 M ODE D TM . PO HKS VDD C LO C K
HDI C1 C2 C3 C4 LO C K X1 X2 XM U TE VSS H .I DOUT
PO outputs a low to break the line when HKS is high (on-hook) and HFO/HDO
PO
O CMOS OUT is low. PO outputs a high to make the line when HKS is low (off-hook) or HFO is
The HT9302 series provide the pin-selected lock func-
tion, Hold-line, Hand-free and LCD dialing number display interface, all of which are suitable for feature phone applications. HT9302G is simpler than HT9302X version. It provides only a redialing memory for simple low-cost system applications.
Package
(Normal version)
¾
¾
Ö
Ö
¾
¾
Ö
Ö
(Simple version)
¾
¾
¾
18 DIP
¾
22 SKDIP
Ö
20 DIP
Ö
24 SKDIP
¾
16 DIP
Rev. 1.20
1
September 30, 2002
Block Diagram
HT9302 Series
C1 K ey
high or HDO is high.
During the off-hook state, the pin also outputs the dialing pulse train in pulse
· Hand-free control
· Hold-line control
· Pause, P®T can be saved for redialing · Lock function
· Resistor options
- M/B ratio - Flash function and flash time - Pause and P®T duration - Pulse number · HT9302A: 18-pin DIP package HT9302B: 22-pin SKDIP package HT9302C: 20-pin DIP package HT9302D: 24-pin SKDIP package HT9302G: 16-pin DIP package
General Description
The HT9302 series tone/pulse dialers are CMOS LSIs for telecommunication systems. They are designed to meet various dialing specifications through resistor option matrix.
C heck
Tone E ncoder
C o n v e rte r
Tone O ut
P u ls e O ut
C lo c k C o n tro l
. la s h
M o d e In
H D /H .
M /B
T im e r
LO C K
K e y to n e G e n e ra to r
DOUT C LO C K