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XE2400

Low-Cost, Embeddable, Serial 2400bps Modem

Xecom 

XE2400 Pin Descriptions

PIN NAME

11 \CTS

DESCRIPTION

Clear to Send, output, active LO, TTL/CMOS. A low indicates the modem is ready

to accept data signals for transmission.

12 OH

Off-Hook, output, active HI, TTL/CMOS. A high indicates the modem's hookswitch

relay is closed connecting the modem to the telephone line.

13 TXD

14 \RTS

15

HS

16

\RI

17 No Pin

18

TIP

19 No Pin

20 RING

21 GND

22 AMP

23-37 No Pin

38 \DCD

39 \DSR

40

Vcc

Serial data input from the DTE (i.e. external UART). A logic "high" represents a "mark" and a

low represents a"space", TTL.

Request to Send, input, active LO, TTL.

High Speed indicator, output, active LO, TTL/CMOS. Low when operating at 2400bps rate,

high otherwise.

Ring Indicator, output, active LO, TTL. When low indicates the modem is receiving a ring

signal.

Tip connection to the phone line (RJ11 pin3) from the internal DAA.

Ring connection to the phone line (RJ11 pin4) from the internal DAA.

Caution: Observe design rules for Tip & Ring trace layout.

Ground.

Audio output to speaker. Function is determined by L & M commands and the value in register

S22. The input impedance to the speaker driver must be greater than 300 ohms.

Data Carrier Detect, output, active LO, TTL/CMOS. Function is set by the &C command and

the value in register S21.

Data Set Ready, output, active LO, TTL/CMOS. Function is set by the &S command and the

value in register S21.

+5 Volts.

XECOM

(3)

XE2400

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