XE5690SM-1ITR Просмотр технического описания (PDF) - Xecom

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XE5690SM-1ITR

Compact, Low-Cost Global Embedded Modem

Xecom 

XE5690SM Pin Descriptions (continued)

PIN NAME DESCRIPTION

3 /INT

4 /RESET

5 SPKR

6 Ground

7 /RI

8 /DTR

9 /TXD

10 /RXD

11 /RTS

12 /DSR

13 /CTS

14 /DCD

15 VCC

UL60950 requires minimum creepage and clearances distances between the Tip and

Ring and all other circuits. Clearance is the shortest distance between conductive

circuits; creepage is the distance between conductive points along the surface.

/INT provides an active low hardware interrupt signal from the XE5690SM. The

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

/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.

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.

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.

/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.

/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.

/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.

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

/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 equip-

ment on /TXD.

/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

XE5690SM asserts /DCD.

VCC provides 3.3 volt power to the modem.

XECOM

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XE5690SM

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