XE5692H-ITR Ver la hoja de datos (PDF) - Xecom

Número de pieza

componentes Descripción

Fabricante

XE5692H-ITR

Half-Size, Low-Cost Global Embedded Modem

Xecom 

XE5692H Pin Descriptions (continued)

PIN NAME DESCRIPTION

3 /DSR

4 /DCD

5 /DTR

6 /RI

7 SPKR

8 Ground

9 /TXD

10 /RXD

11 /RESET

12 /CTS

13 /INT

14 VCC

15 /RTS

16, 17 N/C

/DSR is an active low output from the modem and is forced to the active condition.

/DCD is an active low output from the modem. An active /DCD indicates the

presence of a valid carrier signal. The AT&C command controls when the XE5692H

asserts /DCD.

/DTR is an active low input to the modem. An active /DTR signals the terminal is

available for communications. The AT&D command determines how the modem

interprets activity on /DTR.

The /RI signal reports on the presence of an incoming ring signal. When a ring occurs

across Tip and Ring, the /RI output goes low and toggles with the cadence of the ring

signal.

SPKR provides a Pulse Width Modulated version of the signal on Tip and Ring

allowing connection of a speaker to the modem to monitor modem operations. The

recommended speaker circuit is shown on Page 9 of this data sheet. The signal on

SPKR is controlled by the ATL and ATM commands.

Ground provides the reference voltage for all host interface signals.

/TXD provides the path for transmitted data and modem commands to be passed

from the host controller to the modem.

/RXD provides the path for received data and modem responses to be sent from the

modem to the host controller.

/RESET is an active low input which initiates a modem hardware reset. /RESET

must be active for a minimum of 100 milliseconds for a proper modem reset

sequence. No external reset is required; if none is used the RESET signal should be

left open.

/CTS is an active low output from the modem. When hardware flow control is set,

the modem asserts /CTS to indicate that it can accept data from the terminal

equipment on /TXD.

/INT provides an active low hardware interrupt signal from the XE5692H. The

operation of this interrupt pin is programmable using the modem’s register U70.

VCC provides 3.3 volt power to the modem.

/RTS is an active low input to the modem. When hardware flow control is set, an

active /RTS indicates to the modem that the host has data to send.

These pins are provided only for mechnical stablity. These pins must remain

unconnected.

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XE5692H

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