XE2420-ITR Просмотр технического описания (PDF) - Xecom
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XE2420-ITR Datasheet PDF : 16 Pages
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XE2420 Typical Application Schematic
NM24C04
A0
VCC
A1
WP
A2
SCL
VSS
SDA
+5 Volts
20K
16C550
UART
/TXD
/RXD
/RTS
/RI
/DSR
/DCD
/CTS
/DTR
+5 Volts
Battery
Reset
EECL
EEDT
/TXD
/RXD
/RTS
/RI
/DSR
/DCD
/CTS
/DTR
Vcc
Vui
Gnd
XE2420
RING
TIP
FB1
FB2
RJ11
C1
C2
Notes:
1 FB1 and FB2 are ferrite beads which may be required for EMI filtering in your system. Without these
components you may experience unintended radiation when the telephone cable is attached to your system.
We recommend selecting components such as the TDK ACB2012L-120 which provide a minimum of 100
ohms of impedence at frequencies above 100 MHz.
2. C1 and C2 are high-voltage capacitors which may be required for EMI filtering in your system. Without these
components you may experience unintended radiation when the telephone cable is attached to your system. We
recommend selecting components such as the Panasonic ECKDRS471. This 470 pfd, 3000 volt capacitor will
direct the high frequency harmonics to the system ground. These capacitors must be rated at a minimum of 1500
volts to maintain the isolation required by FCC Part 68 Rules.
3. The Battery applied to Vui allows the XE2420’s Ring Indicate output to remain active even when the modem
itself is powered down. If this power-down mode is not required for your application, Vui should be tied to
VCC.
4. The EEPROM, NM24C04, provides for non-volatile storage of telephone numbers using the AT&Z command.
The EEPROM must be programmed using the Diplomat™ Utility from Zilog Inc.
Diplomat™ is a trademark of Zilog Inc.
XECOM
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XE2420
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