XE2476 查看數據表（PDF） - Xecom
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XE2476 Datasheet PDF : 12 Pages
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PIN NAME I/O
6
D/V
O
7
OH
O
8
RXD O
9
TXD
I
10
Test
-
11
SPK
O
12
VO
O
13
VI
I
14
TIP
—
15
RING —
16
Vcc
—
17
GND —
18
RI
O
DESCRIPTION
The Data/Voice output can be used to drive a relay to connect an
auxiliary telephone handset. Data/Voice is high when the modem is off-
hook.
Off-hook is an active high output which indicates that the XE2476 is
connected to the telephone line.
Received Data provides the serial data output from the modem. A logic
"high" represents a "mark" and a logic "low" represents a "space".
Transmit data provides the serial data input from the host. A logic
"high" represents a "mark" and a low represents a"space", TTL.
The Test pin should be left unconnected at all times.
Audio output to the speaker. Function is determined by L & M
commands . This output cannot directly drive a low impedence
speaker. It can drive a 50k ohm load.
The Modem Line Interface permits placement of non-modem signals on
the telephone line through the modem's telephone interface. VO must
be tied to VI for normal modem operation and open to place non-
modem signals on the line through VI.
Voice Interface provides a path for non-modem signals to be placed on
the telephone line through the modem's telephone interface. VI must
be tied to VO for modem operation. Non-modem signals are placed on
VO to be placed on the telephone line.
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
+5 Volt power for the modem.
Ground reference for the modem.
Ring Indicator provides an active high output whenever a ring signal
appears on the telephone line.
XE2476
XECOM\3
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