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SA2531A Scheda tecnica(PDF) 3 Page - Sames

Il numero della parte SA2531A
Spiegazioni elettronici  VERSATILE SINGLE CHIP TELEPHONE WITH 14 NUMBER REPERTORY DIALLER
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SA2531 A/B/C/E/G/U
3/24
Pin# Symbol Function
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.
4V
DD
Positive Voltage Supply
This is the supply pin for the circuit.
26
V
SS
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/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.
11
OSC
Oscillator Input
Oscillator pin for Xtal or ceramic resonator (3.58 MHz). Recommended part
is the Murata CSA3.5MG312AM.
9
LLC
Line Loss Compensation
Select pin for the loss compensation.
OPEN = None
VDD = 45-75mA
VDD = 20-50mA
12
RR
Repetition Rate
Select pin for repetition rate of melody for the Tone rinser.
22
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)
20
R1
Keyboard Rows
19
R2
18
R3
17
R4
16
C1
Keyboard Columns
15
C2
14
C3
13
C4
7CI
Complex Impedance Input
Input pin for the capacitor in the complex impedance


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