XEV90 Ver la hoja de datos (PDF) - Unspecified
Número de pieza
componentes Descripción
Lista de partido
XEV90 Datasheet PDF : 10 Pages
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Figure 2: XEV90 Pin Configuration
N/C 1
Ring 2
Tip 3
N/C 4
L2 5
L1 6
N/C 7
DC1 8
DC2 9
XEV90
(top)
18 RI(-)
17 RI(+)
16 OH(+)
15 T1
14 T2
13 /Mute
12 OH(-)
11 VCC
10 Gnd
Pin Descriptions
PIN NAME DESCRIPTION
1
N/C
2
Ring
3
Tip
4
N/C
5, 6 L1 & L2
7
N/C
8, 9 DC1 & DC2
10
GND
11
VCC
12
OH(-)
No Connection
Ring is one wire of the two-wire telephone line connection (RJ11 Pin 4). 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. Xecom recommends 0.100 inch spacing between traces connected to
Ring and all other conductors to preserve this isolation.
Tip is one wire of the two-wire telephone line connection (RJ11 Pin 3). The telephone company places
a DC "Battery" voltage across Tip and Ring on all public switched telephone lines. The XEV90 accepts
this line battery voltage without regard to its polarity.
No Connection
L1 and L2 provide the connective points for a billing tone filter when required.
No Connection
DC1 and DC2 control performance of the line current holding circuit. A jumper from DC1 to DC2
limits DC loop current to 60 milliamps. An open circuit between DC1 and DC2 permits loop currents up
to 100 milliamps as required for North America. A resistor may be placed between DC1 and DC2 to
alter the off-hook impedence to meet unique country requirements.
Ground connection to the XEV90. This signal provides the reference for the OH output and RI input.
This pin should be connected to the systems digital ground.
+5 Volt power source for the XEV90. VCC powers the RI and OH control lines.
Modem switch-hook control: OH(-), an active low input, for controls the switch hook in the XEV90.
When the host activates pin 12, the switch-hook closes and the XEV90 seizes the local telephone line.
Pin 16 provides an active high switch-hook control. OH(-) should remian open when using OH(+).
The host can pulse OH(-) line to perform rotary dialing. The normal pulse rate is ten pulses per second.
Closing the switch-hook creates a series of pulses. Dial one pulse for the digit one to ten pulses for the
digit zero. The pulses on OH(-) must be asymmetrical, active for thirty-one milliseconds, inactive for
sixty-nine milliseconds. An inter-digit delay of at least one hundred milliseconds is required.
XECOM
(2)
XEV90
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