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參數(shù)資料
| 型號(hào)： | L3913 |
| 文件頁(yè)數(shù)： | 11/14頁(yè) |
| 文件大?。?/td> | 199K |
| 代理商： | L3913 |
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DIALER FUNCTIONAL DESCRIPTION
The monochip includes a dialling circuit for either
pulsedialling or dual tone multifrequencydialling.
The dialler transmits the codes decoded by the
logic keyboard on the outputs 0L and DTMF.
DIALING MODE SELECTION
The default dialling mode is selected by the tri-
level pin DC/FV(pin 4):
– DC/FV open:
– DC/FV to pin Reset:
– DC/FV to pin GND:
– mixed mode
When the circuit is in pulse mode, it is possible to
change to DTMF dialling with the ” * ” key. The
circuit returns in pulse mode after a reset condi-
tion or after a flash pulse.
pulse dialling in 66/33ms
pulse dialling in 60/40ms
DTMF diallingcalibrated
DIALLING CODES
These are the numeric keys 0 to 9, and the non
numeric keys A, B, C, D, *, #. All of them are
stored in RAM.
The codes A, B, C, D can be only transmitted by
the serial bus, not by standard key board.
In pulse dialling, the code #, B, C, D have no ef-
fect on the dialling. The code A (in pulse mode)
corresponds to 11 pulses.
SERIALBUS DESCRIPTION
A microcontroller can be connected to the mono-
chip by 4 pinsC2, C3, C4, C5 (see fig. 8)
C1 must be connected to V
CC
to select the serial
mode operation.
C2 sends the data, C3 the clock, C4 the enable
VRAM
t
RESET
t
Trt
Trt=T(VRAM to VSoff)+Tr+Ton
D93TL029
Tr
VSoff
Figure 7b:
V
RAM
< V
Son
at t =0
Pinreset:
Itis the power on reset output.
D93TL030
CLOCK
DATA
ENABLE SIGNAL
twh
tsetup
twl
te
tel
teh
tRAN
Figure 9:
Timing serial bus.
MICRO
CONTROLLER
L3913
C1
C2
C3
C4
C5
DATA
CLOCK
ENABLE SIGNAL
STATE OF DIALER
VCC
D93TL031
Figure 8.
L3913
11/14
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