SA2532P Datasheet, PDF (3/21 Pages) Sames – ONE MEMORY SINGLE CHIP TELEPHONE

SA2532P
Pin Description
Pin #
23
24
3
2
5
28
6
1
27
25
4
26
8
21
10
11
12
9
Symbol
M1
M2
RO1
RO2
A_GND
RI
STB
LS
LI
CS
V_DD
V_SS
MO
FCI
HS/DPB
OSC
RR
LLC
Function
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
Analog Ground
This is the analog ground for the amplifiers.
Receive Input
This is the input for the receive signal.
Side Tone Balance Input
This is the input for side tone cancellation.
Line Current Sense Input
This is the input for sensing the line current.
Line Input
This input is used for power extraction and line current sensing.
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
Melody Output
Pulse Density Modulated output of the melody generator for tone ringer. At
high impedance when not active.
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
Repetition Rate.
Select pin for the repetition rate of the tone ringer’s melody output.
Line Loss Compensation.
Select pin for the line loss compensation:
Open
None
Low
20-50mA
High
45-75mA
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sames