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參數(shù)資料
| 型號(hào)： | L3916A |
| 廠商： | 意法半導(dǎo)體 |
| 元件分類： | LED驅(qū)動(dòng)器 |
| 英文描述： | SPEECH AND 14 MEMORY DIALER WITH LED DRIVER |
| 中文描述： | 言論和14記憶體，LED驅(qū)動(dòng)撥號(hào)器 |
| 文件頁數(shù)： | 4/14頁 |
| 文件大?。?/td> | 124K |
| 代理商： | L3916A |
IREF
Pin 13. An external resistor of 3.6kOhm con-
nected between IREF and GND will set the inter-
nal current level.Any change of thisresistor value
will influence the microphone gain, DTMF gain,
earphone gain and sidetone.
V
CC
Pin 14, V
CC
is the positive supply of the speech
network. It is stabilized by a decouplingcapacitor
between V
CC
and GND. The V
CC
supply voltage
may also be used to supply external peripheral
circuits.
LED
Pin 15. Lighted dial indicator.The LED connected
to this pin will light up when the telephone is off-
hook andconsuming 25% of the line current.
I
LINE
Pin 16. A recommended external resistor of
20ohm is connected between I
LINE
and GND.
Changing this resistor value will have influenceon
microphonegain, DTMF gain, sidetone, maximum
output swing on LN and on the DC characteristics
(especially in the low voltageregion).
LN
Pin 17. LN is the positive line terminal of the de-
vice.
REG
Pin 18. The internal voltage regulator has to be
decoupled by a capacitor from REG to GND. The
DC characteristics can be changed with an exter-
nal resistor connected between LN and REG or
between REG and I
LINE
.
GTX, MIC–, MIC+
GTX (pin 19), MIC– (pin 20) and MIC+ (pin 21).
The one chip phone has symmetrical microphone
inputs.The amplification from microphoneinputs to
LN is 51.5dB and it can be adjusted between 43.5
and 51.5dB.The amplification is proportional to ex-
ternalresistorconnectedbetweenGTXandREG.
GDTMF
Pin 22. When the DTMF input is enabled, the mi-
crophoneinputs and the receive amplifier input will
be muted and the dialing tone will be sent to the
line. The voltage amplification from GDTMF to LN
is 40dB. Final ouput level on LN can be adjusted
via the external resistor connected between
GDTMF and GND through a decoupling capaci-
tor. A confidence tone is sent to the earphone
during tone dialing. The attenuation of the confi-
dence tone from LN to Vear is –32dB typically.
V
DD
Pin 23. V
DD
is the positive supply for the dialing
network and must meet the maximum and mini-
mum voltagerequirements.
DEVICEOPERATION
During on-hook all keypad inputs are high imped-
ance internally and it requires very low current for
memory retention. At anytime, Row and Column
inputs assume opposite states at off-hook. The
circuit verifies that a valid key has been entered
by alternately scanning the Row and Column in-
puts. If the input is still valid following 32ms of de-
bounce, the digit is stored into memory, and dial-
ing
begins
after
a
approximately 40ms (measured from the initial
key closure). Output tone duration is shown in Ta-
ble1.
The device allows manual dialing of an indefinite
number of digits, but if more than 32 digits are di-
aled, it will ”wrap around”. That is, the extra digits
beyond 32 will be stored at the beginningof LND
buffer, and the first 32 digits will no longer be
availableforredial.
pre-signal
delay
of
Table 2:
DTMF Output Frequency
Key Input
Stadard
Frequency
697
770
852
941
1209
1336
1477
Actual
Frequency
699.1
766.2
847.4
948.0
1215.9
1331.7
1471.9
% Deviation
ROW 1
ROW 2
ROW 3
ROW 4
COL 1
COL 2
COL 3
+0.31
–0.49
–0.54
+0.74
+0.57
–0.32
–0.35
NORMAL DIALING
D1
Normal dialing is straighforward, all keyboard en-
tries will be stored in the buffer and signaled in
succession.
D2
D3
....etc
PROGRAMMING AND REPERTORY DIALING
To program, enterthe following:
PROG D1 D2 D3.. . Dn MEM (Location0-9)
or
PROG
D1
D2. . . .Dn
During programming,dialingis inhibited.
E1-E3
FUNCTION PIN DESCRIPTION
(continued)
L3916A
4/14
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