SC9302D 查看數據表（PDF） - Silan Microelectronics

零件编号

产品描述 (功能)

生产厂家

SC9302D

1-MEMORY/2-MEMORY TONE/PULSE DIALER

Silan Microelectronics 

Silan

Semiconductors

SC9302 Series

(continued)

PO

MODE

This pin is a CMOS output structure, it receives HKS and HFO/HDO

signals to control the dialer so as to connect or disconnect the

telephone line.

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

O

CMOS OUT

HFO/HDO is low. PO outputs high to make 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.

This is a three-state input/output pin, provided to the user for selecting a

dialing mode among Tone/20pps/10pps.

MODE=VDD: Pulse mode, 10pps.

MODE=OPEN: Pulse mode, 20pps.

CMOS

I/O

MODE=VSS: Tone mode.

IN/OUT

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

changes the following entrance of digits to the tone mode. When the

chips are working in the tone mode, the switching from tone to the pulse

mode will be recognized.

DTMF

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

Otherwise, it always outputs low. The pin outputs tone signals to drive

O

CMOS OUT

the external transmitter amplifier circuit. The load resistor should not be

less than 5kΩ.

This pin is a schmitt trigger input structure. Active low. Applying a

CMOS IN negative going pulse to this pin can toggle the HDO output once.

HDI

I

Pull-High An external RC network is recommended to use for the input

debouncing. The pull-high resistance is 200kΩ typically.

HDO

KT

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

a negative transition on HDI . When HDO is toggled to high, PO keeps

high to hold the line. The hold function can be released by setting HFO

O

CMOS OUT high or by an on-off hook operation or by another HDI input. The HDO

pin can directly drive the melody generator to produce hold-line

background melody. Refer to the functional description for the hold-line

function.

Key-tone output pin. It outputs 1.2kHz tone carrier when any key is

O

CMOS OUT pressed in the pulse mode or when the function keys are pressed in the

tone mode.

(to be continued)

HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD

Rev: 2.0 2001-11-01

10

Share Link: