SA2532KA/B

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Pin Description

Pin #

Symbol

Function

23

24

M1

M2

Microphone Inputs

Differential inputs for the microphone (electret).

2

3

RO1

RO2

Receiver Outputs

These are the outputs for driving a dynamic ear piece with an impedance of

100 to 300Ohms

Analog Ground

This is the analog ground for the amplifiers.

28

RI

Receive Input

This is the input for the receive signal.

6STB

Side Tone Balance Input

This is the input for side tone cancellation.

1LS

Line Current Sense Input

This is the input for sensing the line current.

27

LI

Line Input

This input is used for power extraction and line current sensing.

25

CS

Current Shunt Control Output

This N-channel open drain output controls the external high power shunt

transistor for the modulation of the line voltage and for shorting the line

during make period of pulse dialling.

Positive Voltage Supply

This is the supply pin for the circuit.

26

Negative Power Supply

8MO

Melody Output

Pulse Density Modulated output of the melody generator for tone ringer. At

high impedance when not active.

21

FCI

Frequency Comparator Input

This is a Schmitt trigger input for ring frequency discrimination. Disabled

during off-hook.

10

HS/DPB

Hook Switch Input and Dial Pulse Output

This is an I/O that is pulled high by the hook switch when off- hook. An

open drain pulls it low during break periods of pulse dialling and flash.

11

OSC

Oscillator Input

Oscillator pin for Xtal or ceramic resonator (3.58 Mhz). Recommended :

Murata CSA 3.58MG312AM

12

MODE

OUT

Mode Output.

An Output pin designed to drive a low power LED. Active whenever MF

dialling mode is selected.

9

LLC

Line Loss Compensation.

Select pin for the line loss compensation:

Open

None

Low

20-50mA

High

45-75mA