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PDF SA2532 Data sheet ( Hoja de datos )
| Número de pieza | SA2532 | |
| Descripción | VERSATILE SINGLE CHIP TELEPHONE | |
| Fabricantes | Sames | |
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SA2532
SA2532 A/C/U
VERSATILE SINGLE CHIP TELEPHONE
FEATURES
n Speech circuit, LD/MF Dialler and Tone
Ringer on one 28 pin CMOS chip
n Soft clip to avoid harsh distortion
n Line Loss Compensation selectable by
pin option
n Power down mode
n Versatile applications for different PTT
demands
n 31 digit last number redial
n Sliding Cursor protocol with comparison
n 2 Flash keys, 100 ms and 280 ms (option
600 ms)
n Pause key for 3 sec Auto Pause or Wait
Function
n Ring frequency discrimination
n Operating range from 13 to 100 mA
(down to 5 mA with reduced perform-
ance)
n Low noise (max. -72dBmp)
n Real or Complex impedance on chip pro-
grammable
n LD/MF switchable dialling
n On chip MF filter (CEPT CS 203 compat-
ible)
n 3-tone melody generator with selectable
repetition rates
GENERAL DESCRIPTION
The SA2532 is a CMOS integrated circuit that
contains all the functions needed to form a
high performance electronic telephone.
The device incorporates LD/MF dialling,
melody generation, ring frequency discrimi-
nation and a high quality speech circuit.
A RAM is on chip for a 31 digit last number
redial. The sliding cursor procedure makes
Last Number Redial easy behind a PABX.
The versatility of the circuit is provided by on
chip programmability and a few external com-
ponents. This allows easy adaption to differ-
ent PTT requirements without changing the
PCB of the telephone.
PACKAGE
Available in 28 pin DIP and SOIC
LS
RO2
RO1
VDD
AGND
STB
CI
MO
LLC
HS DP
OSC
RR
C4
C3
1 28
SA2532
14 15
RI
LI
VSS
CS
M2
M1
MODE
FCI
R1
R2
R3
R4
C1
C2
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4153
DR-00975
PDS039-SA2532-001 Rev. C
1/22
1/22
23-10-1995
1 page  
SA2532
Dialling Functions
Valid Keys
The keypad of the SA2532 comprises a maximum of 20 keys (of which 3 have no function).
A Bi-polar scan technique is used so that the 20 keys are scanned in a 4 x 5 matrix using
only 8 pins.
A valid key is detected when one and only one contact closure is detected between a Row
and Column Pin. Key contacts are debounced to avoid incorrect detection.
Dial Mode Selection
The default mode (LD or MF) can be selected by the Mode pin. When default LD mode
is selected, a temporary change to MF can be invoked by pressing the * key. The circuit
will revert to LD by pressing the R (or R2) key or by next on-hook.
When MF mode is selected by the mode pin, the circuit can not be changed temporarily
to LD but will remain in MF.
Last Number Redial
LNR is a facility that allows resignalling of the last manually dialled number without keying
in all the digits again. The LNR is repeatable.
The current contents of the RAM are overwritten by new entries.
A manually entered number is automatically stored in the LNR RAM. The capacity of the
RAM is 31 digits. If a number greater than 31 digits is entered, the LNR facility will be
inhibited (Until new entries < 32 digits) and further entries will be buffered in a First In First
Out Memory (FIFO).
Post dialled digits, i.e. digits manually entered after LNR has been invoked, are not stored
in RAM but buffered in FIFO.
During dialling, one or more pauses can be inserted by pressing the PAUSE KEY. Each
pause is 3 secs (optionally 6 secs) when inserted within the first 5 digits. Otherwise a Wait
Function will halt dialling until the LNR Key is pressed.
Recall Function
A Recall (R key or R2 key) activation will invoke a Flash (Timed Loop Break).
If Recall is the first entry in a digit string, it will be stored in LNR RAM when digit(s) are
entered after the Recall.
If the recall key is depressed after a digit string has been entered or dialled out, the recall
will not be stored but buffered in the FIFO together with subsequently entered digits.
If pressing the recall key is not followed by digit entries, the LNR RAM remains intact.
After a recall, a 3 second pause will automatically be executed.
Mute Function
The MUTE key is enabled in speech mode only. Depressing the MUTE key mutes the
microphone amplifier. Repressing the MUTE key deactivates the mute (toggle function).
Any key entry overwrites a mute activated by the MUTE key and mute will be deactivated.
When privacy mute is activated a reminder tone is applied to the earpiece every 3
seconds.
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5 Page 
Privacy Mute
SA2532
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11 Page | ||
| Páginas | Total 22 Páginas | |
| PDF Descargar | [ Datasheet SA2532.PDF ] | |
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