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XE0020 View Datasheet(PDF) - Xecom

Part Name
Description
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XE0020 Datasheet PDF : 6 Pages
1 2 3 4 5 6
Pin Descriptions continued
Pin Name
6
VCC
7
T2
8
/RI
9
HInt
10
/CD
Description
VCC provides the + 5 volt power source for the XE0020.
T2 connects directly to the secondary side of the XE0020"s internal telephone line
transformer.
Ring Indicate, output, active low, TTL, RI provides a ring frequency pulse train representation.
An external 56K pull-up resistor is required to correctly bias the ring indicate output.
Handset Interrupt is an active high output from the modem. HInt goes high for one second if
an extension telephone is picked-up while the DAA has control of the line. When the host
sees HInt go high, it should immediately lower OH to disconnect the XE0020 or XE0020C
from the telephone line.
Connect Detect, output, active low, TTL. /CD indicates that the XE0020 is connected to the
telephone line and the telephone line is not in use.
XE0020/XE0020C Typical Connection Diagram
+5 Volts
Modem
Data Pump
Ring
VCC
56K
/RI
RXA
TXA1
TXA2
340 ohms
Z1
Z2
T1
C1
T2
15 Ohms 1/2 W
Ring
Tip
15 Ohms 1/2 W
FB2
MOV1
FB1
Off Hook
OH
Controller
HInt
/CD
Gnd
RJ11
4
C2
3
C3
Recommended Parts
Designation
Description
C1
.01 Microfarad
C2,C3
47 pico farad, 3000 volts
Z1, Z2
Zener Diode, 4.3 volts
FB1, FB2
Ferrite Beads (TDK Part Number CCB30-453215B)
MOV1
Minimum Breakover 220 volts (Teccor Electronics Part Number P2600BA70)
XECOM
(3)
XE0020
 

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