LUCL7585FP Ver la hoja de datos (PDF) - Agere -> LSI Corporation

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LUCL7585FP

Full-Feature, Low-Power SLIC and Switch

Agere -> LSI Corporation 

L7585F Full-Feature, Low-Power SLIC and Switch

Data Sheet

September 2001

Operating States (continued)

Ground Start/Tip Ground State

s Ground start busy supervision state.

s Same as ground start/tip open state but with SW1

closed.

Forward Battery Ring Open State

s Tip lead continuity test state (tone injected at the

receive port) in forward battery.

s Same as forward battery active state, but with SW4

and SW4a open, and the ring drive amplifier

powered down.

s Pin PR is high impedance (>100 kΩ).

s Tip current limit is twice the low-current active state

current limit.

s NDET indicates an off-hook when the tip current

(flowing out of PT) is twice the value programmed for

the switchhook detector in the forward battery active

state.

Ringing States (2)

s Normal ringing state.

s Tip and ring drive amplifiers are powered down.

s SW1 and SW5 closed; SW2, SW2a, SW3, SW4,

SW4a, and SW6 open.

s NDET reflects the status of the ring trip detector.

s Bit B3 indicates whether the ringing voltage applied

to the ringing bus is either battery backed (B3 = 1) or

earth backed (B3 = 0). Although B3 has no direct

effect on the state of the SLIC, it can be used by the

ring trip detector to enhance ring trip detection.

Disconnect State

s All circuits are powered up and active.

s SW2, SW2a, SW4, and SW4a closed; SW1, SW3,

SW5, and SW6 open.

s PT and PR are at the same potential to deny current

to the loop.

Forward Battery Low-Current Active State

s Normal talk and forward battery feed state.

s All circuits are powered up and active.

s Pin PT is positive with respect to pin PR (forward bat-

tery).

s SW2, SW2a, SW4, and SW4a closed; SW1, SW3,

SW5, and SW6 open.

s NDET reflects the status of the switchhook detector.

s Current limit is lowered to approximately 0.66 times

the normal limit.

High-Impedance States (2)

s Disconnect state.

s Tip and ring drive amplifiers are powered down (all

bias currents off).

s Pins PT and PR are high impedance (>100 kΩ).

s SW1, SW2, SW2a, SW3, SW4, SW4a, SW5, and

SW6 open.

s NDET is undefined.

Reverse Battery Active State

s Normal talk and reverse battery feed state.

s Same as forward battery active state, but PR is posi-

tive with respect to PT.

Reverse Battery Tip Open State

s Ring lead continuity test state (tone injected at the

receive port) in reverse battery.

s SW2 and SW2a open and the tip drive amplifier pow-

ered down.

s Pin PT is high impedance (>100 kΩ).

s Pin PR is held between -1.7 V and -2.3 V for PR cur-

rents less than +-20 mA. PR current limit is the SW4

break switch current limit (250 mA < I < 85 mA).

s NDET indicates an off-hook when the ring current

(flowing out of PR) is twice the value programmed for

the switchhook detector in the reverse battery active

state.

8

Agere Communications Inc.

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