CH1782A Просмотр технического описания (PDF) - Cermetek Microelectronics

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CH1782A

Family of Ultra Small Modem Modules V.22bis-2400bps

Cermetek Microelectronics 

Cermetek Microelectronics, Inc.

CH1782A Family of Ultra Small Modem Modules V.22bis-2400bps

Figure 3B. CH1782A Voice Application illustrating the use of the VI pin to control external injection of voice

or data into the CH1782A and onto the PSTN line.

PIN NAME

1

-

2 GND

3

VI

4

VCC

5 RXD

6 DTR

7 DSR

8 DCD

Table 3. CH1782A Pin Description.

I/O FUNCTION

NC NO CONNECTION. Formerly RTS – Not supported by the CH1782A.

- GROUND. Note: Noise should be less than 50mV peak to peak.

I/O VOICE INJECTION. Use this port to transmit/receive voice or DTMF signals to/from the

PSTN Line.

- POWER SUPPLY. 5 volts + 5% Note: Noise should be less than 50mV peak to peak.

O RECEIVE DATA. Serial Receive data output. Received marking or binary 1 condition is

indicated by HIGH.

I DATA TERMINAL READY. Active LOW. Switching off DTR can either return modem to

command state, disconnect phone call, or reset modem. DTR should be set LOW when not

used.

O DATA SET READY. LOW indicates handshaking with a remote modem is in progress, and/

or the data carrier of a remote modem has been detected.

O DATA CARRIER DETECT. LOW indicates a data carrier from a remote modem is detected.

Must be enabled using the &C1 command.

2002 Cermetek Microelectronics, Inc.

Page 6

Document No. 607-0009 Revision C (01/03)

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