SA2531F datasheet(3/24 Pages) SAMES

3 / 24 page

sames

SA2531 A/B/C/E/G/U

3/24

Pin# Symbol Function

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.

Negative Power Supply

8MO

Melody Output

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

high impedance when not active.

FCI

Frequency Comparator Input

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

during off-hook.

HS/DP

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.

OSC

Oscillator Input

Oscillator pin for Xtal or ceramic resonator (3.58 MHz). Recommended part

is the Murata CSA3.5MG312AM.

LLC

Line Loss Compensation

Select pin for the loss compensation.

OPEN = None

VDD = 45-75mA

VDD = 20-50mA

Repetition Rate

Select pin for repetition rate of melody for the Tone rinser.

MODE

Signalling Mode Select Input

Mode pin

Function

High

LD mode, 10pps, M:B = 33:66 (J:20pps)

Open

MFonly

Low

LD mode, 10pps, M:B = 40:60 (J:20pps, M:B = 33:66)

Keyboard Rows

Keyboard Columns

7CI

Complex Impedance Input

Input pin for the capacitor in the complex impedance

SA2531F Datasheet(PDF) 3 Page - Sames

SA2531F Datasheet(HTML) 3 Page - Sames

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24

Datasheet Download

Link URL