L3000N datasheet(9/32 Pages) STMICROELECTRONICS

Part #	L3000N

Description	SLIC KIT OPTIMIZED FOR APPLICATIONS WITH BOTH FIRST AND SECOND GENERATION COMBOS

PDF	32 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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RING wires the voltage will increases to – 24V.

The comparator C1 will change its output voltage

from low to high level.

If the Chip Select input (CS) is low the ONHK out-

put pin will be set to low level (+ 0V) indicating

that the off hook condition is present.

This off-hook detection circuit can be influenced

by common mode signal present on RING Termi-

nal. The capacitor Cs is used to filter this common

mode signal.

In the case of very high common mode signal af-

ter the detection of a low level on the ONHK out-

put pin, it is suggested to set the SLIC in Stand-

by. In this operating mode the off-hook detection

circuit is not sensitive to the line common mode

signal.

If in Stand-by Mode the off-hook detection is not

confirmed (ONHK output set to high level) we

suggest after few second to set the SLIC again in

Power Down Mode.

Total operation is managed by line card control-

ler.

Figure 4: Off-hook Detection Circuit in Power Down Mode

L3000N

L3000N - L3092

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L3000N Datasheet(PDF) 9 Page - STMicroelectronics