HT9320L datasheet(4/29 Pages) HOLTEK

4 / 29 page

Memory dialing vs. keyboard form table

Dialing Output

One-Touch

Memory Keyboard

Two-Touch

Memory Keyboard

Three-Touch

Memory Keyboard

M1~M10

M1 ~ M10

a (a=1~9, 0)

M11~M20

M11 ~ M20

PAGE Ma (Ma=M1~M10)

A PAGE a (a=1~9, 0)

Pin Description

Pin Name

I/O

Internal

Connection

Description

C1~C8

R1~R5

I/O

CMOS

IN/OUT

These pins form a 5

´8 keyboard matrix which can perform keyboard input de-

tection and dialing specification setting functions. When on-hook (HKS=high)

all the pins are set high. While off-hook the column group (C1~C8) remains

low and the row group (R1~R5) is set high for key input detection.

For the HT9320L-X, the column group remains high and the row group is set

low for key input detection.

An inexpensive single contact 5

´8 keyboard can be used as an input device.

Pressing a key connects a single column to a single row, and actuates the sys-

tem 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.

OSCILLATOR

The system oscillator consists of an inverter, a bias resistor and the necessary

load capacitor on chip. Connecting a standard 3.579545MHz crystal or ce-

ramic resonator to the X1 and X2 terminals can implement the oscillator func-

tion. The oscillator is turned off in the standby mode, and is actuated

whenever a keyboard entry is detected.

XMUTE

NMOS OUT

XMUTE is an NMOS open drain structure pulled to VSS during dialing signal

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

speech circuit when transmitting the dial signal.

HKS

CMOS IN

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.

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 stand-by mode and

ready to receive the key input.

CMOS OUT

This pin is a CMOS output structure which by receiving the HKS and

HFO/HDO signals, control the dialer to connect or disconnect the telephone

line.

PO outputs a low to break line when HKS is high (on-hook) and HFO/HDO is

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

or HDO is high.

During the off-hook state, this 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, either

Tone mode or Pulse mode, 10pps/20pps

MODE=VDD: Pulse mode, 10pps

MODE=OPEN: Pulse mode, 20pps

MODE=VSS: Tone mode

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

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

switching to the pulse mode will also be recognized.

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

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

HT9320 Series

Rev. 1.10

October 1, 2002

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