XE2420G Просмотр технического описания (PDF) - Unspecified
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XE2420G Datasheet PDF : 22 Pages
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XE2420G Pin Descriptions (continued)
PIN NAME DESCRIPTION
9
/RI
10 Ground
11 SPKR
12 N/C
13 /INT
14 VCC
15 N/C
16-19 NP
20-21 N/C
22 Tip
23 N/C
24 Ring
The /RI signal reports on the presence of an incoming ring signal. When a ring occurs across
Tip and Ring, the /RI output goes low and toggles with the cadence of the ring signal.
Ground provides the reference voltage for all host interface signals.
SPKR allows connection of a speaker to monitor modem operations. SPKR cannot directly drive
a speaker. An amplifier with a minimum input impedance of 300 ohms is required. The signal on
SPKR is controlled by the ATM command.
No internal connection
/INT provides an active low hardware interrupt signal from the XE2420G. The operation of this
interrupt pin is programmable using the modem’s register U70.
VCC provides 3.3 volt power to the modem.
No internal connection
No Pin
No internal connection
The Ring and Tip signals provide modem the connection to the telephone line. 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.
The telephone company places a DC “Battery” voltage across Tip and Ring on all public switched
telephone lines. The XE2420G will operate regardless of the polarity of this “Battery” voltage.
The “Battery” voltage drives up to 100 milliamps of DC loop current.
UL60950 requires minimum creepage and clearances distances be maintained between the Tip
and Ring traces and all other circuits. Clearance is the shortest distance between conductive
circuits; creepage is the distance between conductive surfaces along the surface
No internal connection, To prevent damage in case of voltage surges on the telephone line, we
recommend that nothing be connected to this pin.
The Ring and Tip signals provide modem the connection to the telephone line. 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.
The telephone company places a DC “Battery” voltage across Tip and Ring on all public switched
telephone lines. The XE2420G will operate regardless of the polarity of this “Battery” voltage.
The “Battery” voltage drives up to 100 milliamps of DC loop current.
UL60950 requires minimum creepage and clearances distances be maintained between the Tip
and Ring traces and all other circuits. Clearance is the shortest distance between conductive
XECOM
(4)
XE2420G
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