SA2532KA/B
Pin Description
Pin #
Symbol
Function
23
24
2
M1
M2
RO1
RO2
Microphone Inputs
Differential inputs for the microphone (electret).
Receiver Outputs
These are the outputs for driving a dynamic ear piece with an impedance of
100 to 300Ohms
3
5
28
6
A
GND
Analog Ground
This is the analog ground for the amplifiers.
Receive Input
This is the input for the receive signal.
Side Tone Balance Input
RI
STB
LS
This is the input for side tone cancellation.
Line Current Sense Input
1
This is the input for sensing the line current.
Line Input
This input is used for power extraction and line current sensing.
27
25
LI
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
4
VDD
This is the supply pin for the circuit.
26
8
VSS
MO
Negative Power Supply
Melody Output
Pulse Density Modulated output of the melody generator for tone ringer. At
high impedance when not active.
21
10
11
12
9
FCI
HS/DPB
OSC
Frequency Comparator Input
This is a Schmitt trigger input for ring frequency discrimination. Disabled
during off-hook.
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.
Oscillator Input
Oscillator pin for Xtal or ceramic resonator (3.58 Mhz). Recommended :
Murata CSA 3.58MG312AM
MODE
OUT
Mode Output.
An Output pin designed to drive a low power LED. Active whenever MF
dialling mode is selected.
Line Loss Compensation.
LLC
Select pin for the line loss compensation:
Open
Low
High
None
20-50mA
45-75mA
/21
3
sa me s
SAMES [ SAMES ]
