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PDF L3916A Data sheet ( Hoja de datos )
| Número de pieza | L3916A | |
| Descripción | SPEECH AND 14 MEMORY DIALER WITH LED DRIVER | |
| Fabricantes | STMicroelectronics | |
| Logotipo |  |
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® L3916A
SPEECH AND 14 MEMORY DIALER WITH LED DRIVER
SPEECH CIRCUIT
2 TO 4 WIRES CONVERSION
PRESENT THE PROPER DC PATH FOR THE
LINE CURRENT AND THE FLEXIBILITY TO
ADJUST IT AND ALLOW PARALLEL PHONE
OPERATION
PROVIDES SUPPLY WITH LIMITED CUR-
RENT FOR EXTERNAL CIRCUITRY
SYMMETRICAL HIGH IMPEDANCE MICRO-
PHONE INPUTS SUITABLE FOR DYNAMIC
ELECTRET OR PIEZOELECTRIC
TRANSDUCER
ASYMMETRICAL EARPHONE OUTPUT
SUITABLE FOR DYNAMIC TRANSDUCER
LINE LOSS COMPENSATION
INTERNAL MUTING TO DISABLE SPEECH
DURING DIALING
LIGHTED DIAL LED CONSUMING 25% OF
LINE CURRENT
DIALER CIRCUIT
32 DIGITS FOR LAST NUMBER REDIAL
BUFFER
18 DIGITS FOR 13 MEMORY REDIAL
ALLOW MIXED MODE DIALING IN EITHER
TONE OR PULSE MODE
PACIFIER TONE PROVIDES AUDIBLE INDI-
CATION OF VALID KEY PRESSED IN A
BUZZER OR/AND IN THE EARPHONE
TIMED PABX PAUSE
FLASH INITIATES TIMED BREAK: 585ms.
CONTINUOUS TONE FOR EACH DIGIT UN-
TIL KEY RELEASE
USES INEXPENSIVE 3.579545MHz CE-
RAMIC RESONATOR
POWERED FROM TELEPHONE LINE, LOW
OPERATING VOLTAGE FOR LONG LOOP
APPLICATION
SO28
ORDERING NUMBER: L3916AD
PIN CONNECTION (Top view)
KEYPAD CONFIGURATION
DESCRIPTION
The device consists of the speech and the dialer.
It provides the DC line interface circuit that termi-
nates the telephone line, analog amplifier for
speech transmission and necessary signals for
either DTMF or loop disconnect (pulse) dialing.
March 2000
Note: PAUSE/LND:
PAUSE and LND functions are sharing the same key with different
sequence. Hereafter, PAUSE and LND keys are referring to the same
key.
1/14
1 page  
FUNCTION PIN DESCRIPTION (continued)
To dial a number from repertory memory (HKS
must be low), enter the following:
MEM (Location 0-9) or E1-E3
To save the last number dialed, enter the follow-
ing:
PROG MEM (location 0-9) or E1-E3
HOOK FLASH
D1 FLASH D2 ...etc
Hook flash may be entered into the dialed se-
quence at any point by keying in the function key,
FLASH. Flash consists of a timed break of
585ms, 300ms or 100ms depending on the Mask
option. When a FLASH key is pressed, no further
key inputs will be accepted until the hookflash
function has been dialed. The key input following
a FLASH will be stored as the initial digit of the
new number, overwriting the number dialed be-
fore the FLASH, unless it is another FLASH.
FLASH key pressed immediately after hookswitch
or LND will not clear the LND buffer unless digits
are entered following the FLASH key.
Example:
FLASH
LND not cleared
LND FLASH
LND not cleared
LND FLASH D1 D2
LND buffer will contain D1, D2
PAUSE/LAST NUMBER DIALED
If the PAUSE/LND key is pressed right after off
hook or FLASH key, it is considered as LND, if it
is pressed after a digit, it will be considered as
PAUSE.
LAST NUMBERED DIALED
OFF-HOOK PAUSE/LND or FLASH PAUSE/LND
Last number dialing is accomplished by entering
the PAUSE/LND key.
PAUSE
OFF-HOOK D1 PAUSE/LND D2 ...etc
A pause may be entered into the dialed sequence
at any point by keying in the special function key,
L3916A
PAUSE/LND. Pause inserts a 3.1 second delay
into the dialing sequence. The total delay, includ-
ing pre-digit and post-digit pauses is shown in Ta-
ble 3.
Table 3: Special Function Delays
Each delay shown below represents the time re-
quired after the special function key is depressed
until a new digit is dialed. The time is considered
”FIRST” key if all previous inputs have been com-
pletely dialed. The time is considered ”AUTO” if in
redial, or if previous dialling is still in progress.
Function First/Auto
SOFTSW ITCH
PAUSE
FIRST
AUTO
FIRST
AUTO
Delay (seconds)
Pulse
Tone
0.2
1.0
2.6 3.0
3.4 3.1
SOFTSWITCH FUNCTION USING TONE/PULSE
MODE SWITCH
When dialing in Pulse mode after off-hook,
switching TONE/PULSE mode switch from Pulse
to Tone will cause the device to change the sig-
naling mode into tone signal and store the soft-
switch function in the LND memory for redial. To
redial the softswitch function (mixed mode dialing)
in the pulse mode after going on-hook and back
to off-hook, you have to switch the TONE/PULSE
mode switch back to pulse mode either before go-
ing on-hook or after off-hook or during on-hook.
Subsequent mode change from Tone to Pulse will
change the signaling mode to pulse dialing se-
quence but this mode change will not be stored in
.the LND memory.
When dialing in Tone mode after off-hook, a
switching of TONE/PULSE mode Switch from
Tone to Pulse will cause the device to change the
signaling mode into pulse mode but this mode
change will not be stored in the LND memory.
When LND key is pressed in Tone mode after go-
ing off-hook, the device will output all tone sig-
nals.
A pacifier tone of 75ms is provided after 32ms de-
bounce time when switching from Pulse to Tone
mode.
Redial by the LND key will repeat the mixed dial-
ing sequence in Pulse mode.
5/14
5 Page 
TEST CIRCUITS(continued)
Figure 7.
470nF
2.25K GDTMF
22
4.0V
22nF
VMF
IDD
RDTMF
VDD
470K
PULSE
3.58MHz
OSC
PULSE
TONE
SW2 MODE
100K /PT
HKS
SW1
GND
300Ω 10µF
Re
Vear
RXOUT
100K GRX
RGRX
IREF
3.6K
VCC
100µF
RGIN
23
6
5
7
8
9
10
11
13
14
12
620Ω
100nF
Figure 8.
470nF
2.25K
GDTMF
22
IDD 22nF
4.0V
470K
3.58MHz
SW2
PULSE
TONE
100K
SW1
RP
10µF
Re
Vear
RGRX
3.6K
100µF
VDD
PULSE
OSC
MODE
/PT
HKS
GND
23
6
5
7
8
9
RXOUT
GRX
10
11
IREF
13
VCC
RGIN
14
12
620Ω
Vinp
100nF
L3916A
C4
4
C3
3
2 C2
C1
1
R1
28
R2
27
R3
26
R4
25
R5
24
VLN
GDTMF=20log
VMF
Vear
CDTMF=20log
VLN
1 2 3 FLASH
4 5 6 PROG
7 8 9 P/LND
*0#
E1 E2 E3 MEM
MIC+
21
2.2K
1µF
MIC-
20
GTX
19
1µF
RGTX 88K 4.7µF
REG
18
LN
17
VLN
LED
15
ILED
16
ILINE
390Ω
130K
3.9K
100µF
IL
20Ω 390Ω
600Ω
D95TL166
C4
4
C3
3
2 C2
C1
1
R1
28
27 R2
R3
26
R4
25
R5
24
GRX=20log
Vear
Vinp
NRX with Vin=0
1 2 3 FLASH
4 5 6 PROG
7 8 9 P/LND
*0#
E1 E2 E3 MEM
MIC+
21
2.2K
1µF
MIC-
20
GTX
19
1µF
RGTX 4.7µF
REG
18
LN
17
VLN
LED
15
ILED
16
ILINE 390Ω
130K
3.9K
100µF
IL
20Ω 390Ω
D95TL167
11/14
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet L3916A.PDF ] | |
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