SC9302F datasheet(10/39 Pages) SILAN

10 / 39 page

Silan

Semiconductors

SC9302 Series

HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD

Rev: 2.0

2001-11-01

(continued)

CMOS OUT

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

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.

MODE

I/O

CMOS

IN/OUT

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

dialing mode among Tone/20pps/10pps.

MODE=V

DD: Pulse mode, 10pps.

MODE=OPEN: Pulse mode, 20pps.

MODE=V

SS: Tone mode.

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

CMOS OUT

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

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

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

less than 5k

Ω.

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 to use for the input

debouncing. The pull-high resistance is 200k

Ω typically.

HDO

CMOS OUT

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

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.

CMOS OUT

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

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

tone mode.

(to be continued)

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