msm7715 Oki Semiconductor, msm7715 Datasheet - Page 4

• Manufacturer Part Number: msm7715
• Description: Multi-function Telecommunication Lsi
• Manufacturer: Oki Semiconductor

¡ Semiconductor
PIN DESCRIPTION
DTG4
TEN
TD
RS
CPW
ICTA
ICTB
DTTIM
MODE1
MODE2
MODE3
X1
X2
CLK
RD
CD
CP
DT1
DT2
DT3
DT4
SP
PON
AOUT
Name
Pin No.
10
11
12
13
15
16
17
18
19
20
21
22
23
24
27
1
2
3
4
5
6
7
8
9
I/O
I*
I*
I*
I*
I*
I*
I*
I*
I*
O
O
O
O
O
O
O
O
I
Input for specifying the DTMF code to be sent.
Input for controlling output of the DTMF signal. (Transmit enable)
DTG1 to DTG4 are latched at the falling edge of TEN and the DTMF signal is
output when “0” is input. See Fig. 2.
Input for data to be sent to the modem. Input the data string at a speed of 300 bps
or lower.
Input for controlling the modem sending output. (Request to send)
The sending signal is output when “0” is input.
Input for selecting the output waveform from the call progress tone detector.
When "1" is input, a rectangular wave that is synchronized with the input signal is
output from the CP.
When "0" is input, presence of detected signal is output from the CP pin. See Fig.3.
Inputs for testing. Leave them open or connect them to V
Input pin for controlling the detection timing of the DTMF receiver.
When “0” is input, the high-speed detection mode is selected.
Input for selecting the operation mode. See Table 1.
Input and output connected to the crystal oscillator. See “Oscillation Circuit” in
the Functional Description.
3.579545 MHz clock output
Output for serial data received by the modem. It is held in the marked state
(“1”) when the carrier detector (CD) does not make detection.
Output for the carrier detector. “0” means detection, while “1” means
non-detection.
Output for call progress tone (CPT) detection. When the CPT is detected,
the waveform selected by the CPW pin is output. See Fig. 3.
Outputs for the code of the received DTMF signal. In a mode other than the
DTMF receiving mode, these pins are in a high-impedance state.
Output for presenting the DTMF signal receiving data. “1” means that the DTMF
signal is being received. Latch DT1 to DT4 at the rising edge of SP.
See Fig. 1.
Input for controlling power-on. When “1” is input, all lines of this device enter the
power down state, and then the operation of each funciton stops and the receiver
timer is reset.
Analog signal output. The DTMF signal or modem sending signal is output.
Description
DD
.
MSM7715
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