XEV90-ITR Ver la hoja de datos (PDF) - Xecom
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XEV90-ITR Datasheet PDF : 10 Pages
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Pin Descriptions
PIN NAME DESCRIPTION
13
Mute
The Mute signal can be used for pulse (rotary) dialing. The host must toggle the Mute signal to generate
the dialing pulses.
14
T2
T2 in conjunction with T1 provides the differential input/output for the analog signal. T2 connects
directly to the secondary side of the miniature line transformer embedded into the XEV90. To match the
impedance of the DAA to the 600 ohm telephone line, a 320 ohm resistor must be connected in series
with T1 or T2.
15
T1
T1 in conjunction with T2 provides the differential input/output for the analog signal. T1 connects
directly to the secondary side of the miniature line transformer embedded into the XEV90. To match the
impedance of the DAA to the 600 ohm telephone line, a 320 ohm resistor must be connected in series
with T1 or T2.
16
OH(+)
Switch-hook control to the modem. OH(+) provides an active high input for controlling the switch
hook. When pin 16 is active, the switch-hook closes and the XEV90 seizes the local telephone line.
OH(+) should remain 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 these 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.
17
RI(+)
Ring Indicate output from the modem. RI(+) is an active high, open-emmitter output. RI(+) provides
a square wave representation of the Ring signal present across Tip and Ring. This permits intelligent
monitoring of the incoming ring. The XEV90 recognizes ring voltages of thirty-eight to one hundred
fifty volts RMS in the frequency range of sixteen to sixty-eight Hertz. When using the RI(+) output,
a 20 Kohm pull-down resistor must be added to RI(+); RI(-) must be tied to VCC.
18
RI(-)
Ring Indicate output from the modem. RI(-) is an active low, open collector output. RI(-) provides
a square wave representation of the Ring signal present across Tip and Ring. This permits intelli-
gent monitoring of the incoming ring. The XEV90 recognizes ring voltages of thirty-eight to one
hundred fifty volts RMS in the frequency range of sixteen to sixty-eight Hertz. Pin 17 provides an
active high ring indication. When using the RI(-) output, a 20 Kohm pull-up resistor must be added
to RI(-); RI(+) must be tied to ground.
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