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L7585G Datasheet(PDF) 7 Page - Agere Systems

Part # L7585G
Description  Full-Feature,Low-Power SLIC and Switch
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Manufacturer  AGERE [Agere Systems]
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L7585G Datasheet(HTML) 7 Page - Agere Systems

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Agere Communications Inc.
7
Data Sheet
September 2001
L7585G Full-Feature, Low-Power SLIC and Switch
Operating States
The L7585 has 14 operating states. These states are
selected using 4 bits, B0—B3, according to the truth
table shown in Table 2. The operation of the L7585 is
undefined for unassigned states. Additionally, bit B4
independently operates the test-in access contacts so
that all states are available for self-test; and bit B5
independently operates a relay driver, regardless of the
status of bits B0—B4. All 6 bits are loaded via the par-
allel data interface and chip select lead NCS.
Table 2. B0—B3 Input State Coding
Table 3. B4—B5 Input State Coding
Forward Battery 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.
Ground Start/Tip Open State
s
Ground start idle supervision state.
s
Ring lead continuity test state (tone injected at the
receive port) in forward battery.
s
Same as forward battery active state, but with SW2
and SW2a open, and the tip drive amplifier powered
down.
s
Pin PT is high impedance (>100 k
Ω).
s
The ring current limit is approximately equal to the
value programmed for the high-current active state
current limit. Current limit is achieved by reducing the
ring lead voltage only (see Table 6).
s
NDET indicates an off-hook when the ring current
(flowing into PR) is twice the value programmed for
the switchhook detector in the forward battery active
state.
B3 B2 B1 B0
State
1
1
1
1
Forward Battery Active
1
1
1
0
Ground Start/Tip Open
1
1
0
1
Ground Start/Tip Ground
1
1
0
0
Forward Battery Ring Open
1
0
1
1
Ringing (Battery Backed)
1
0
1
0
Disconnect State
1
0
0
1
Forward Battery Low-Current
Active State
1
0
0
0
High Impedance
0
1
1
1
Reverse Battery Active
0
1
1
0
Reverse Battery Tip Open
0
1
0
1
Ground Start/Tip Amplifier
0
1
0
0
Reverse Battery Ring Open
0
0
1
1
Ringing (Earth Backed)
0
0
1
0
Unassigned
0
0
0
1
Reverse Battery Low-Current
Active State
0
0
0
0
High Impedance
Bit
State
B4
1
Test-in contacts off.
0
Test-in contacts on.
B5
1
Relay driver off.
0
Relay driver on.


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