sames
Key Features
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SA2532KA/B
SINGLE CHIP
TELEPHONE FOR INDIA
Speech Circuit, LD/MF Dialler and Tone Ringer
on one 28 pin CMOS chip
Low Noise
31 digit Last Number Redial
Line Loss Compensation selectable by pin
option
2 Timed Break Recall keys
Moving Cursor protocol with comparison
On chip MF filter (CEPT CS 203 compatible)
Pause key for auto pause or wait function
Power down mode
Ring frequency discrimination
Selectable Loop-Disconnect or DTMF dialling
modes
Real or complex impedance programmable
Soft Clipping to avoid harsh distortion
Uses inexpensive 3.58MHz ceramic resonator
Operating range from 13 to 100 mA
3 Tone melody generator
General Description
The SA2532K is a CMOS integrated circuit that
contains all the functions needed to form a high
performance electronic telephone.
The device incorporates LD/MF repertory dialling,
melody generation, ring frequency discrimination
and a high quality speech circuit.
Soft switch into temporary MF mode using * when
LD mode is selected .Timed Break Recall will be
available in both LD and MF dialling modes.
A 31 digit Last Number Redial (LNR) memory, with
moving cursor protocol, activated by single key
depression.
Line Loss Compensation whereby send and receive
gains are adjusted (by 6dB) over the ranges
selected by the LLC pin.
Block Diagram
hook
+
LI
LS
STB
+
RI
A
GND
CS
BJT
LINE
CURRENT
SENSE
+
RO1
RO2
+
SA2532K
V
DD
M1
V
DD
V
SS
SOFT
CLIP
M2
MO
MELODY
SEQUENCER
TONE
GENERATOR
MUTE
R4
R3
DIALER
FC1
RING
FREQUENCY
DISCRIMINATION
R2
R1
CONTROL
LOGIC
OSC
RAM
+
HS/DP
MODE
LLC
OSC
MODE_OUT
C1 C2
C3 C4
KEYPAD
+
DAT_SH02
PDS039-SA2532K-001
Rev. C
20-03-00
SAMES [ SAMES ]
