HT9302.pdf

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

Hand-free control

Operating voltage: 2.0V~5.5V

Hold-line control

Low standby current

Pause, P

T can be saved for redialing

Low memory retention current: 0.1

A (typ.)

Lock function

Tone/pulse switchable

Resistor options

M/B ratio

Flash function and flash time

Pause and P T duration

Pulse number

Interface with LCD driver

32 digits for redialing

32 digits for SA memory dialing

One-key redialing

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

Pause and P T key for PBX

4 4 keyboard matrix

3.58MHz crystal or ceramic resonator

General Description

The HT9302 series tone/pulse dialers are CMOS LSIs

for telecommunication systems. They are designed to

meet various dialing specifications through resistor op-

tion matrix.

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.

Selection Table

Function

Part No.

Lock Function

(Pin Selection)

Hold Line

Hand Free

LCD Interface

Package

HT9302x

(Normal version)

HT9302A

18 DIP

HT9302B

22 SKDIP

HT9302C

20 DIP

HT9302D

24 SKDIP

HT9302G

(Simple version)

HT9302G

16 DIP

Rev. 1.20

September 30, 2002

HT9302 Series

Block Diagram

Pin Assignment

HT9302x normal version

HT9302G simple version

Rev. 1.20

September 30, 2002

HT9302 Series

Keyboard Information

Pin Description

Pin Name I/O

Internal

Connection

Description

4 keyboard matrix which can perform key board input detec-

tion and dialing specification setting functions. Whe n o n -ho ok (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.

An inexpensive single contact 4

C1 ~ C4

R1~R4

I/O CMOS IN/OUT

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 descrip-

tion for dialing specification selection.

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

resonator to the X1 and X2 terminals can implement the oscillator function. The

oscillator is turned off in the standby mode, and is actuated whenever a key-

board entry is detected.

OSCILLATOR

XMUTE

NMOS OUT

XMUTE is an NMOS open drain structure pulled t o VSS d uring dialing signal

transmission. Otherwise, it is an open circuit. The XMUTE is used to mute the

speech circuit when transmitting the dial signal.

HKS

CMOS IN

This pin is u sed to monitor t he s tatus of the hook-switch and its combination

with HFI/HDI can control th e PO pin output to make or br eak the line.

HKS=VDD: On-hook state (PO=low). Except for HFI/HDI

(hand-free/hol d-lin e 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.

CMOS OUT

This pin is a CMOS output structure, which by receiving HKS and HFO/HDO

sign als, control the dialer to connect or d iscon nect the telephone line.

PO out put s a low to break the line when HKS is high (on-hook) and HFO/HDO

is low. PO outputs a high to make the line when HKS is low (off-hook) or HFO is

high or HDO is high.

During the off-hook state, the pin also outputs the dialing pulse train in pulse

mode dialing. While in the tone mode, this pin is always high.

MODE

I/O CMOS IN/OUT

This is a three-state input/output pin, used for dialing mode selection whether

Tone mode or Pulse mode; 10pps/20pps.

MODE=VDD: Pulse mode, 10pps

MODE=OPEN: Pulse mode, 20pps

MODE=VSS: Tone mode

During pulse mode dialing, switching this pin to the tone mode changes the

subsequent digit entry to tone mode. When the chips are in tone mode, switch-

ing to the pulse mode will also be recognized.

Rev. 1.20

September 30, 2002

These pins form a 4

HT9302 Series

Pin Name I/O

Internal

Connection

Description

DTMF

CMOS OUT

This pin is active only when the chip transmits tone dialing signals. Otherwise, it

always outputs a low. The pin outputs tone signals to drive the external trans-

mitter amplifier circuit. The load resistor should not be less than 5k

HDI

CMOS IN

Pull-high

This pin is a Schmitt trigger input structure. Active low. Applying a negative go-

ing pulse to this pin can toggle the HDO output once.

An external RC network is recommended for input debouncing. The Pull-high

resistance is 200k

typ.

HDO

CMOS OUT

The HDO is a CM OS output structure. Its output is to ggl e- controlled by a nega-

tive transition on HDI. When HDO is toggled high, PO keeps high to hold the

line. The hold function ca n be released by setting HFO high or by an on-off hook

operation or by another HDI input. Refer to the functional description for the

hold-line function.

HFI

CMOS IN

Pull-low

This pin is a Schmitt trigger input structure. Active high. Applying a positive go-

ing pulse to HFI can toggle the HFO once and hence control the hand-free func-

tion. The Pull-low resistance of HFI is 200k typ.

An external RC network is recommended for input debouncing.

HFO

CMOS OUT

The HFO is a CMOS output structure. Its output is toggle- controlled by a posi-

tive t ran sition on HFI pin. When HFO is high, the hand-free function is enabled

and PO outputs a high to connect the line.

The hand-free function can be released by setting HDO high or by an on-off-hook

operation or by another HFI input. Refer to the functional description for the

hand-free functional operation.

LOCK

I/O CMOS IN/OUT

This is a three-state input/output pin, used for controlling long distance call

function with a lock-switch.

LOCK=OPEN: Normal dialing (no lock)

LOCK=VDD: 0, 9 is inhibited for use as the first key input

LOCK=VSS: 0 is inhibited for use as the first key input

DOUT

NMOS OUT

NMOS open drain output pin. It outputs the BCD code of the dialing digits to the

LCD driver chip (HT16XX series) or MCU for dialing number display. Refer to

the functional description for the detailed timing.

CLOCK

NMOS OUT

NMOS open drain output. When dialing, it outputs a series of pulse trains for

DOUT data synchronization. DOUT data is valid at the falling edge of clock.

VDD

Positive power supply, 2.0V~5.5V for normal operation

VSS

Negative power supply, ground

Approximate internal connection circuits

Rev. 1.20

September 30, 2002

HT9302 Series

Absolute Maximum Ratings

Supply Voltage ........................................... 0.3V to 6V

Storage Temperature ...........................

Cto125

Input Voltage .............................. V SS 0.3 to V DD +0.3V

Operating Temperature .......................... 20 Cto75

Note: These are stress ratings only. Stresses exceeding the range specified under Absolute Maximum Ratings may

cause substantial damage to the device. Functional operation of this device at other conditions beyond those

listed in the specification is not implied and prolonged exposure to extreme conditions may affect device reliabil-

ity.

Electrical Characteristics

f OSC =3.5795MHz, Ta=25

Test Conditions

Symbol

Parameter

Min.

Typ.

Max. Unit

V DD

Conditions

V DD

Operating Voltage

5.5

Pulse Off-hook

Keypad entry

No load

0.2

I DD

Operating Current

2.5V

Tone

0.6

I STB

Standby Current

On-hook, no load

No entry

V R

Memory Retention Voltage

5.5

I R

Memory Retention Current

1V On-hook

0.1

0.2

V IL

Input Low Voltage

V SS

0.2V DD

V IH

Input High Voltage

0.8V DD

V DD

I XMO

XMUTE Leakage Current

V XMUTE =12V

No entry

I OLXM

XMUTE Sink Current

2.5V V XMUTE =0.5V

I HKS

HKS Pin Input Current

2.5V V HKS =2.5V

0.1

R HFI

HFI Pull-low Resistance

2.5V V HFI =2.5V

200

R HDI

HDI Pull-high Resistance

2.5V V HDI =0V

200

I OH1

Keypad Pin Source Current

2.5V V OH =0V

I OL1

Keypad Pin Sink Current

2.5V V OL =2.5V

200

400

I OH2

HFO Pin Source Current

2.5V V OH =2V

I OL2

HFO Pin Sink Current

2.5V V OL =0.5V

I OH3

HDO Pin Source Current

2.5V V OH =2V

I OL3

HDO Pin Sink Current

2.5V V OL =0.5V

Control key

0.2

t FP

Pause Time After Flash

Digit key

t RP

One-key Redialing Pause Time

One-key redialing

t DB

Key-in Debounce Time

t BRK

Break Time for One-key Redialing

One-key redialing

1.2

f OSC

System Frequency

Crystal=3.5795MHz

3.5759 3.5795 3.5831 MHz

Rev. 1.20

September 30, 2002

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