L9218A Просмотр технического описания (PDF) - Agere -> LSI Corporation

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L9218A

Low-Cost Line Interface

Agere -> LSI Corporation 

L9218A/G Low-Cost Line Interface

Data Sheet

November 2001

Functional Description

Table 2. Input State Coding

B0 B1

State/Definition

1 1 Powerup, Forward Battery. Normal talk and battery feed state. Pin PT is positive with respect to PR.

On-hook transmission is enabled. Low current limit is selected.

1 0 Powerup, Forward Battery. Normal talk and battery feed state. Pin PT is positive with respect to PR.

On-hook transmission is enabled. High current limit is selected.

0 0 Disconnect. The tip and ring amplifiers are turned off, and the SLIC goes to a high-impedance state

(>100 kΩ). Supervision outputs read on hook. Device will power up in this state.

0 1 Low-Power Scan. Except for off-hook detection, all circuits are shut down to conserve power. Pin PT

is positive with respect to pin PR. On-hook transmission is disabled.

Table 3. Supervision Coding

NSTAT

0 = off-hook or ring trip.

1 = on-hook and no ring trip.

TSD

0 = Normal device operation.

1 = Device is in thermal shutdown.

6

Agere Systems Inc.

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