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PDF IL2533A Data sheet ( Hoja de datos )
| Número de pieza | IL2533A | |
| Descripción | MULTISTANDARD CMOS IC | |
| Fabricantes | IK Semiconductor | |
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TECHNICAL DATA
MULTISTANDARD CMOS IC OF SINGLE CHIP PHONE
WITH DOUBLE SOFT LIMITATION
IL2533A
Description
IL2533AN, IL2533AD is CMOS IC, supporting all functions, necessary for design of electronic
telephone with high characteristics. Standard application circuit is shown at figure 2.
Device includes LD/MF constant automatic dialer, melodies generation, ring frequency
identification and high quality circuit for line/speech.
RAM at chip, intended for redialing of 31-digit number and memory elements, containing upto
21 symbols/data. Floating marker method enables to use LNR function under control of different
РАВХ systems. Device contains volume control of hearing aid. Volume is controlled by VOL
button (5.4dB) or "–/+" button (plus 8.1/minus 5.4dB in 5 levels).
Main features
─ Line/speech circuit. LD/MF constant automatic dialer
and tone ring at one 28-pin CMOS chip.
─ Operational range 13 to 100 mА (decreasing upto 5 mА
causes productivity deterioration).
─ Soft limitation for elimination of drastic distortion.
─ Controlling of received signal volume.
─ Automatic line loss compensation.
─ Low noise level (max – 72 dBmp).
─ Actual or complex impedance.
─ Switching LD/MF dialing.
─ Tone damper during programming.
─ Redial of the last 31 digit number.
─ Reference storage.
─ Redial of busy line or previous connection.
─ Pause button for applying to pause or waiting function.
─ 3 pulse flashes: buttons, ―R1‖–100 ms, ―R2‖ – 280 ms
and ―R3‖ – 375/600 ms.
─ Active RC-filter on chip.
─ Circuit of ring frequency determination.
─ Three-tone melody generator
LS
MFL
RO
VDD
AGND
STB
CI
LO
LCC
HS/DP
OSC
MODE
C4
C3
01
02
03
04
05
06
07
08
09
10
11
12
13
14
package pin out
28 RI
27 LI
26 VSS
25 CS
24 M2
23 M1
22 LED
21 FCI
20 R1
19 R2
18 R3
17 R4
16 C1
15 C2
PACKAGE
IL2533AD assembly to 28-pin SO-package
MS-013AE.
IL2533AN assembly to 28-pin DIP-package
MS-011AB.
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1 page  
IL2533A
KEYBOARD CONNECTING
Keyboard connecting is shown at figure 3.
Key closed, RON MAX = 1 Ohm
Key opened, ROFF MIN = 1 Ohm
C1 C2 C3 C4
R1 P/M 1 2 3
R2 4 5 6 7
R3 8 9 0 *
R4 # R1 R2 R3
LNR VOL
+
-
A B CD
RP PS T/P M1
M2 M3 M4 MR
Figure 3 – Keyboard connecting
Power-up set up
On-chip voltage on preset circuit traces supply voltage VDD during receiver off-hook.
When VDD increase reaches level approximately 1.2 V, preset circuit empties RAM.
Direct current conditions
Typical operational range is from 13 to 100 mА. Operational range by lowered effectiveness
is from 5 to 13 mА (parallel operation). In operational range all functions are active.
By line currents lower than 13 mА microcircuit provides additional decrease lower than 4.5 V
in order to allow parallel operation (see fig. 4).
Direct current characteristic (excluding diode bridge) determining by voltage to LI and R1
resistor by line currents higher than 13 mА by following form:
VLS = VLI + ILINE R1
(1). Voltage at LI is 4.5 V in typical operational range. In dialing mode, speech scheme and
inactive device parts is in mode of decreased power consumption with the purpose of current
saving. CS output pulls up to Vss in order to connect outer shunting transistor for supporting of low
voltage at LS output within periods forming.
IMPEDANCE FOR ALTERNATING CURRENT
Circuit impedance on alternating current is adjusting by outer components. Impedance can
be actual and complex. Alternating-current resistance ZAC, Ohm, is determining according to
following form
ZAC = 33 Z1
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IL2533A
Digits, dialed later, i.e. digits entered by hand after LNR invocation, are not stored to RAM,
but buffered to FIFO.
REDIALING
The last hand-dialed number can be redial without lever pressing, with the help of RP key. If
dialed number is busy, than pressing of RP key interrupts line for 1.6 с (in order to pass to new
dialing) and after pause number will be repeated.
Redialing function is allowed, if number was dialed before pressing RP key. It can be called
unlimited times till next pressing of the lever. During 1.6-second interval, device is in lower energy
consumption mode for current saving.
REPEATED CALL FUNCTION
Repeated call activation (R1, R2 or R3 keys) will cause flash (with periodic intervals), at that
R1 flashes are never accomplished in LD mode. R2 and R3 will be implemented independently of
mode.
If repeated call is repeated record in digit line, it will be stored into LNR RAM, when digit
(digits) are entered after repeated call.
If redial key is pressed after entering of digit line into FIFO buffer with sequentially entered
digit.
If redial key pressing does not accompanying by digits entering, LNR RAM stays untouched.
After number redialing, pause with duration 270 ms will be accomplished.
Keys from М1 to М12 are keys of direct memory access, and MR key is used for abbreviated
dialing.
Table 2
Memory structure
Number storing
Keys of direct memory access
Indirect memory
Quantity of numbers or keys
14
4
10
Numbers can be stored to on-chip RAM. Every number can contain upto 21 digit (including
pauses).
During programming several pauses can be entered by PS or LNR keys pressing. Every
pause, inserted within first 5 entries will be automatically limited after 2 seconds, while pauses,
inserted after position 5 in the digit line will stop dialing that can be continued after PS or LNR keys
pressing. ―Stop‖ function allows dialing in PABX extension.
Example – 45678–123 is stored in М1, where "–" is pause/waiting, and 123 is extension
number:
1) Lift up the receiver. Wait for tone signal;
2) Press М1 (45678 will be dialed);
3) Wait for tone signal from called РАВХ;
4) Press PS or LNR (123 will be dialed).
Dialing from the memory is cascade. However, one memory cell contents shall be dialed
before new one can be invoked.
РАВХ – PAX with outcoming and incoming communication.
11
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