XE2422H Ver la hoja de datos (PDF) - Unspecified

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XE2422H

Low-Cost, 2400 BPS Surface-Mount Modem

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XE2422H Pin Descriptions (continued)

PIN NAME DESCRIPTION

3 /DCD

/DCD is an active low output from the modem that indicates the presence of a valid

carrier signal. The SE2 register controls /DCD in the XE2422H. The default state is

for /DCD to be disabled ATSE2=04 enables /DCD.

4 /DTR

/DTR is an active low input to the modem. The operation of /DTR is controlled by

register SE2 and is normally disabled. When enabled, the modem will exit data mode

and enter command mode if /DTR is removed while the modem is on-line. In Pulse and

FSK Alarm modes raising /DTR is the only was to disconnect the data link.

5 /RI

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. /RI is controlled by register S0D bit 6. The default condition is for /RI to be

disabled.

6 Reserved Reserved for future use

7 Ground Ground provides the reference voltage for all host interface signals.

8 TXD

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

the host controller to the modem. A logic high on TXD represents a “Mark” condition

and a logic low represents a “Space” condition.

9 RXD

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

modem to the host controller. A logic high on RXD represents a “Mark” condition and

a logic low represents a “Space” condition.

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

11 /CTS

/CTS is an active low output from the modem. The modem asserts /CTS to indicate that

it can accept data from the terminal equipment on TXD.

12 /INT

/INT provides an active low hardware interrupt signal from the XE2422H. The operation

of this interrupt pin is programmable using registers SE2 and S08. /INT can be

programmed to indicate Loss of Carrier, Wake-on-Ring, Loss of Loop Current, or

Shared Line Activity. Once triggered the /INT line remains active until cleared by the

AT:I command.

13 VCC VCC provides 3.3 volt power to the modem.

XECOM

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XE2422H

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