HT9320L datasheet(5/29 Pages) HOLTEK

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Pin Name

I/O

Internal

Connection

Description

HDI

CMOS IN

Pull-high

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

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

W typ.

HDO

CMOS OUT

The HDO is a CMOS output structure. Its output is toggle- controlled by a nega-

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

The hold function can be released by setting HFO high or by an on-off hook oper-

ation 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

function.

An external RC network is recommended for input debouncing. The pull-low

resistance of HFI is 200k

W typ.

HFO

CMOS OUT

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

tive transition on the HFI pin. When HFO is high, the hand-free function is en-

abled and PO outputs a high to connect the line.

The hand-free function can be released by an on-off-hook operation or by

another HFI input or by setting HDO high. Refer to the functional description

for the hand-free function operation.

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

¾¾

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

VSS

¾¾

Negative power supply, ground

HST

CMOS IN

Pull-low

(HT9320A)

On-hook store enable input

HST=VDD: On-hook store (HT9320A/H)

HST=Floating: Off-hook store (HT9320A)

HST=VSS: Off-hook store (HT9320H)

The Pull-low resistance is 200k

W typ.

CMOS IN

(HT9320H)

M/B

CMOS IN

Pull-high

(HT9320A)

Make/Break ratio selection

M/B=VSS: 33.3/66.6 (HT9320A)

M/B=Floating: 40/60 (HT9320A)

M/B=VDD: 33.3/66.6 (HT9320H)

M/B=VSS: 40/60 (HT9320H)

The pull-high resistance is 200k

W typ.

CMOS IN

(HT9320H)

CMOS OUT

Keytone output pin. Outputs a 1.2kHz tone carrier for 34ms each time a key is

pressed in the pulse mode.

HT9320 Series

Rev. 1.10

October 1, 2002

HT9320L Datasheet(PDF) 5 Page - Holtek Semiconductor Inc

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