XE924M Просмотр технического описания (PDF) - Xecom
Номер в каталоге
Компоненты Описание
Список матч
XE924M Datasheet PDF : 20 Pages
| |||
XE924M PIN CONFIGURATION
SIGNAL
/DSR
/MDSR
RXD
/MRXD
TXD
/MTXD
/RI
/MRI
RING
PINS
19
20
21
22
23
24
25
26
27
DESCRIPTION
/DSR is the Data Set Ready input to the communications controller. This
pin is normally tied to /MDSR, pin 20
/MDSR supplies the Data Set Ready output from the modem. /MDSR is
an active low output. This pin is normally tied to /DSR, pin 19.
RXD is the serial data input to the communications controller. This pin is
normally tied to /MRXD, pin 22.
/MRXD is the serial data output from the XE924M’s internal modem. A
Mark condition on /MRXD is active low. This pin is normally tied to
RXD, pin 21.
TXD is the serial data output from the communications controller. It is
normally tied to /MTXD, pin 24
/MTXD is the serial data input to the internal modem. A Mark condition
on /MRXD is active low. TXD is normally tied to /MTXD, pin 23
/RI provides the Ring Indication input to the communications controller. /
RI is normally tied to Pin 26
/MRI supplies the Ring Indication output from the embedded modem in
the XE924M. /MRI is active low. /MRI is normally tied to Pin 26
The Ring and Tip signals provide the connection from the XE924M to
the telephone line. FCC Part 68 Rules require a 1500 volt isolation barrier
between the telephone line and all other circuits. This isolation must be
preserved throughout the system.
TIP
NO PIN
VMD
UL60950 requires minimum creepage and clearances distances be
maintained between Tip and Ring and all other circuits. Clearance is the
shortest distance between conductive circuits; creepage is the distance
between conductive surfaces along the surface.
28
The Ring and Tip signals provide the connection from the XE924M to
the telephone line. FCC Part 68 Rules require a 1500 volt isolation barrier
between the telephone line and all other circuits. This isolation must be
preserved throughout the system.
UL60950 requires minimum creepage and clearances distances be
maintained between the Tip and Ring traces and all other circuits.
Clearance is the shortest distance between conductive circuits; creepage
is the distance between conductive surfaces along the surface.
29
This pin is intentionally removed to improve the isolation from the local
telephone line.
30
VMD provides 3.3 Volt power to the integral modem.
XECOM
(5)
XE924M
Share Link: 