MSM7715 データシートの表示（PDF） - Oki Electric Industry

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MSM7715

Multi-Function Telecommunication LSI

Oki Electric Industry 

¡ Semiconductor

MSM7715

PIN DESCRIPTION

Name Pin No. I/O

Description

DTG4

1

I* Input for specifying the DTMF code to be sent.

Input for controlling output of the DTMF signal. (Transmit enable)

TEN

2

I* DTG1 to DTG4 are latched at the falling edge of TEN and the DTMF signal is

output when “0” is input. See Fig. 2.

TD

3

I*

Input for data to be sent to the modem. Input the data string at a speed of 300 bps

or lower.

RS

4

I*

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

CPW

5

I* output from the CP.

When "0" is input, presence of detected signal is output from the CP pin. See Fig.3.

ICTA

6

ICTB

7

I* Inputs for testing. Leave them open or connect them to VDD.

DTTIM

MODE1

MODE2

MODE3

X1

X2

CLK

8

I*

Input pin for controlling the detection timing of the DTMF receiver.

When “0” is input, the high-speed detection mode is selected.

9

10

I* Input for selecting the operation mode. See Table 1.

11

12

I Input and output connected to the crystal oscillator. See “Oscillation Circuit” in

13

O the Functional Description.

15

O 3.579545 MHz clock output

RD

16

O

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.

CD

17

O

Output for the carrier detector. “0” means detection, while “1” means

non-detection.

CP

18

O

Output for call progress tone (CPT) detection. When the CPT is detected,

the waveform selected by the CPW pin is output. See Fig. 3.

DT1

19

DT2

20

O Outputs for the code of the received DTMF signal. In a mode other than the

DT3

21

DTMF receiving mode, these pins are in a high-impedance state.

DT4

22

Output for presenting the DTMF signal receiving data. “1” means that the DTMF

SP

23

O signal is being received. Latch DT1 to DT4 at the rising edge of SP.

See Fig. 1.

PON

AOUT

Input for controlling power-on. When “1” is input, all lines of this device enter the

24

I* power down state, and then the operation of each funciton stops and the receiver

timer is reset.

27

O Analog signal output. The DTMF signal or modem sending signal is output.

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