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參數(shù)資料
| 型號： | L7585G |
| 廠商： | Lineage Power |
| 英文描述： | Full-Feature, Low-Power SLIC and Switch(特點齊全的低功耗用戶接口和開關) |
| 中文描述： | 全功能，低功耗SLIC和開關（特點齊全的低功耗用戶接口和開關） |
| 文件頁數(shù)： | 8/22頁 |
| 文件大?。?/td> | 560K |
| 代理商： | L7585G |
8
Lucent Technologies Inc.
Data Sheet
May 2000
L7585G Full-Feature, Low-Power SLIC and Switch
Operating States
(continued)
Ground Start/Tip Ground State
I
Ground start busy supervision state.
I
Same as ground start/tip open state but with SW1
closed.
Forward Battery Ring Open State
I
Tip lead continuity test state (tone injected at the
receive port) in forward battery.
I
Same as forward battery active state, but with SW4
and SW4a open, and the ring drive amplifier
powered down.
I
Pin PR is high impedance (>100 k
).
I
Tip current limit is twice the low-current active state
current limit.
I
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)
I
Normal ringing state.
I
Tip and ring drive amplifiers are powered down.
I
SW1 and SW5 closed; SW2, SW2a, SW3, SW4,
SW4a, and SW6 open.
I
NDET reflects the status of the ring trip detector.
I
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
I
All circuits are powered up and active.
I
SW2, SW2a, SW4, and SW4a closed; SW1, SW3,
SW5, and SW6 open.
I
PT and PR are at the same potential to deny current
to the loop.
Forward Battery Low-Current Active State
I
Normal talk and forward battery feed state.
I
All circuits are powered up and active.
I
Pin PT is positive with respect to pin PR (forward bat-
tery).
I
SW2, SW2a, SW4, and SW4a closed; SW1, SW3,
SW5, and SW6 open.
I
NDET reflects the status of the switchhook detector.
I
Current limit is lowered to approximately 0.66 times
the normal limit.
High-Impedance State
I
Disconnect state.
I
Tip and ring drive amplifiers are powered down (all
bias currents off).
I
Pins PT and PR are high impedance (>100 k
).
I
SW1, SW2, SW2a, SW3, SW4, SW4a, SW5, and
SW6 open.
I
NDET is undefined.
Reverse Battery Active State
I
Normal talk and reverse battery feed state.
I
Same as forward battery active state, but PR is posi-
tive with respect to PT.
Reverse Battery Tip Open State
I
Ring lead continuity test state (tone injected at the
receive port) in reverse battery.
I
SW2 and SW2a open and the tip drive amplifier pow-
ered down.
I
Pin PT is high impedance (>100 k
).
I
Pin PR is held between
–1.7 V and –2.3 V for PR
currents less than
±
20 mA. PR current limit is the
SW4 break switch current limit (250 mA < I < 85 mA).
I
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.
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