LUCL9312AP-D AGERE [Agere Systems], LUCL9312AP-D Datasheet - Page 11

• Manufacturer Part Number: LUCL9312AP-D
• Description: Line Interface and Line Access Circuit Forward Battery SLIC and Ringing Relay for TR-57 Applications
• Manufacturer: AGERE [Agere Systems]

July 2001
State Definitions
Primary Control Modes
Powerup, Forward Battery
Scan
Agere Systems Inc.
Normal talk and battery feed state.
Pin PT is positive with respect to pin PR.
All ac transmission and dc feed circuits are powered
up.
On-hook transmission is enabled.
Thermal shutdown is active.
Battery window comparator sense shutdown is on.
Switch break switches (SW1 and SW2) are closed,
and ring access switches (SW3 and SW4) are open.
V
tions.
Automatic battery switch selects V
ing off-hook conditions.
All supervision circuits except for ring trip detector
are active.
NSTAT represents the loop closure detector status.
Scan clamp circuitry is active.
Loop closure is active.
All ac transmission, dc feed, and other supervision
circuits, including ring trip, are shut down.
Thermal shutdown is active.
Battery window comparator sense shutdown is on.
On-hook transmission is disabled.
Pin PT is positive with respect to PR, and V
applied to tip/ring.
Switch break switches (SW1 and SW2) are closed,
and ring access switches (SW3 and SW4) are open.
NSTAT represents the loop closure detector status.
BAT1
is applied to tip and ring during on-hook condi-
Forward Battery SLIC and Ringing Relay for TR-57 Applications
BAT1
or V
BAT2
BAT1
dur-
is
Ringing
Disconnect—Break Before Make
Reset
Special States
Thermal Shutdown
Switch break switches (SW1 and SW2) are open,
and ring access switches (SW3 and SW4) are
closed.
Tip/ring drive amplifiers are powered down.
Ring trip circuit is active.
Loop supervision and common-mode current detec-
tors are powered down.
NSTAT represents the ring trip detector status.
The tip and ring amplifiers are turned off to conserve
power.
Break switches (SW1 and SW2) are open, and ring
access switches (SW3 and SW4) are open. This
mode is also used as a transitional mode to achieve
break-before-make switching from the power ring to
active or scan mode.
All supervision circuits are powered down; NSTAT
overrides the actual loop condition and is forced high
(on-hook).
Selection of device reset via the RESET pin will set
the device into the disconnect break-before-make
state.
Not controlled via truth table inputs.
This mode is caused by excessive heating of the
device, such as may be encountered in an extended
power cross situation.
Upon reaching the thermal shutdown temperature,
the device will enter an all-off mode.
Upon cooling, the device will re-enter the state it was
in prior to thermal shutdown.
Hysteresis is built in to prevent oscillation. In this
mode, supervision output NSTAT is forced low
(off-hook) regardless of loop status or if the discon-
nect logic state is selected.
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