HT9302C 데이터 시트보기 (PDF) - Holtek Semiconductor

부품명

상세내역

제조사

HT9302C

1-memory/2-memory tone/pulse dialer

Holtek Semiconductor 

HT9302 Series

Pin Name

DTMF

HDI

HDO

HFI

HFO

LOCK

DOUT

CLOCK

VDD

VSS

I/O

Internal

Connection

Description

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

O CMOS OUT 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 5kW.

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

I

CMOS IN

Pull-high

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 200kW typ.

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

O CMOS OUT line. The hold function can 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.

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

I

CMOS IN

Pull-low

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

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

An external RC network is recommended for input debouncing.

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

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

O

CMOS OUT

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.

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

function with a lock-switch.

I/O CMOS IN/OUT LOCK=OPEN: Normal dialing (no lock)

LOCK=VDD: ²0, 9² is inhibited for use as the first key input

LOCK=VSS: ²0² is inhibited for use as the first key input

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

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

the functional description for the detailed timing.

O

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.

¾

¾

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

¾

¾

Negative power supply, ground

Approximate internal connection circuits

C M O S IN /O U T

V DD

NM OS OUT

C M O S IN

CM OS OUT

V DD

C M O S IN

P u ll- h ig h

V DD

C M O S IN

P u ll- lo w

O S C IL L A T O R

X1

X2

10M W

20pF

10pF

Rev. 1.30

4

May 13, 2009

Share Link: