XE2420-ITR Ver la hoja de datos (PDF) - Xecom
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XE2420-ITR Datasheet PDF : 16 Pages
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XE2420 Pin Descriptions (continued)
PIN NAME DESCRIPTION
8 /TXD
9
/RI
10 Ground
11 N/C
12 EECL
13 EEDT
14 VCC
15 Vui
16 HI2
17 CD
18 HI1
/TXD provides the path for transmitted data and modem commands to be passed from the host
terminal equipment to the modem.
The /RI signal reports on the presence of an incoming ring signal. When a ring occurs across
Tip and Ring, the /RI output toggles at the ring frequency. The /RI output is powered by Vui
and therefore operates even when VCC is removed from the modem.
Ground provides the reference voltage for all host interface signals.
No internal connection
EECL provides the clock to the optional external non-volatile memory. The XE2420 requires
a serial 8 by 256 Byte EEPROM for telephone number storage. If the non-volatile memory is
not used, EECL should remain unconnected.
EEDT provides the serial data connection for the optional, external non-volatile memory. The
XE2420 requires a serial 8 by 256 Byte EEPROM for telephone number storage. If the non-
volatile memory is not used, EEDT should remain unconnected.
VCC provides 5 volt power to the modem. The RI output is not powered by VCC but by Vui.
Vui provides uninterrupted power to the XE2420 ring detect circuit. Placing 5 volt power on
Vui insures that the /RI ouput will operate when VCC is removed from the modem.
HI2 is one of the four hardware hooks for connecting shared line features to the XE2420.
HI2 interfaces to the 911 Interrupt circuit. This circuit detects changes in the loop current
when an extension handset is lifted as when making an emergency call. The system host
should immediately abort the modem connection to permit the user to complete their call.
See the Application Note on Page 10 of this data sheet to see how these line monitoring
circuits interface with the XE2420.
CD provides another of the four hardware hooks for connecting shared line features to the
XE2420. CD interfaces to the Connect Dectect circuit. Connect Detect allows the system
host to check the status of the telephone line before going off-hook to initiate a call. If the
phone line is in use,the host can delay its call until the telephone line is free. See the
Application Note on Page 10 of this data sheet to see how these line monitoring circuits
interface with the XE2420.
HI1 is one of the four hardware hooks for connecting shared line features to the XE2420.
HI1 interfaces to the 911 Interrupt circuit. This circuit detects changes in the loop current
when an extension handset is lifted as when making an emergency call. The system host
should immediately abort the modem connection to permit the user to complete their call.
See the Application Note on Page 9 of this data sheet to see how these line monitoring
circuits interface with the XE2420.
XECOM
(4)
XE2420
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