L9217G データシートの表示（PDF） - Agere -> LSI Corporation

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L9217G

Low-Cost Line Interface with Reverse Battery and PPM

Agere -> LSI Corporation 

L9217A/G Low-Cost Line Interface

with Reverse Battery and PPM

Data Sheet

November 2001

Functional Description

Table 2. Input State Coding

B0 B1 B2

State/Definition

1 1 1 Powerup, Forward Battery, Normal Overhead. Normal talk and battery feed state. Pin PT is

positive with respect to PR. On-hook transmission is enabled. PPM is not active. Overhead is un-

affected by resistor OVH and is adequate for 3.14 dBm overload into 900 Ω.

1 0 1 Powerup, Reverse Battery, Normal Overhead. Normal talk and battery feed state. Pin PT is

negative with respect to PR. On-hook transmission is enabled. PPM is not active. Overhead is un-

affected by resistor OVH and is adequate for 3.14 dBm overload into 900 Ω.

1 1 0 Powerup, Forward Battery, High Overhead. Normal talk and battery feed state. Pin PT is posi-

tive with respect to PR. On-hook transmission is enabled. PPM is not active. Overhead is in-

creased via resistor OVH.

1 0 0 Powerup, Reverse Battery, High Overhead. Normal talk and battery feed state. Pin PT is neg-

ative with respect to PR. On-hook transmission is enabled. PPM is not active. Overhead is in-

creased via resistor OVH.

0 1 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.

0 0 1 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 0 0 Powerup, Reverse Battery, High Overhead with PPM. Normal talk and battery feed state. Pin

PT is negative with respect to PR. On-hook transmission is enabled. PPM is active. Overhead is

increased via resistor OVH.

0 1 0 Powerup, Forward Battery, High Overhead with PPM. Normal talk and battery feed state. Pin

PT is positive with respect to PR. On-hook transmission is enabled. PPM is active. Overhead is

increased via resistor OVH.

Table 3. Supervision Coding

0 = off-hook or ring trip.

1 = on-hook and no ring trip.

NSTAT

6

Agere Systems Inc.

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