LE58QL061BVC Zarlink, LE58QL061BVC Datasheet - Page 9

• Manufacturer Part Number: LE58QL061BVC
• Description: QUAD, SLAC, PROG CODEC, 3.3V, GCI, 20 I/0, PQT44, LEAD FREE
• Manufacturer: Zarlink

PIN DESCRIPTIONS
AGND, DGND
CD1
CD2
C3
C4
C5
C6
C7
CHCLK
Pin Names
1
1
1
1
1
–C3
–C4
–C5
–C6
–C7
1
1
–CD1
–CD2
4
4
4
4
4
,
,
,
4
4
,
Power
Inputs/Outputs
Inputs/Outputs
Outputs
Output
Type
Separate analog and digital grounds are provided to allow noise isolation; however, the two
grounds are connected inside the part, and the grounds must also be connected together on
the circuit board.
Control and Data. CD1 and CD2 are TTL compatible programmable Input or Output (I/O)
ports. They can be used to monitor or control the state of SLIC device or any other device
associated with the subscriber line interface. The direction, input or output, is programmed
using MPI Command 54/55h or GCI Command SOP 8. As outputs, CD1 and CD2 can be used
to control relays, illuminate LEDs, or perform any other function requiring a latched TTL
compatible signal for control. In PCM/MPI mode, the output state of CD1 and CD2 is written
using MPI Command 52h. In GCI mode, the output state of CD1 and CD2 is determined by
the C1 and C2 bits contained in the down stream C/I channel for the respective channel. As
inputs, CD1 and CD2 can be processed by the QLSLAC device (if programmed to do so). CD1
can be debounced before it is made available to the system. The debounce time is
programmable from 0 to 15 ms in 1 ms increments using MPI Command C8/C9h and GCI
Command SOP 11. CD2 can be filtered using the up/down counter facility and programming
the sampling interval using MPI Command E8/E9h or GCI Command SOP 12.
Additionally, CD1 can be demultiplexed into two separate inputs using the E1 demultiplexing
function. The E1 demultiplexing function of the QLSLAC device was designed to interface
directly to Legerity SLIC devices supporting the ground key function. With the proper Legerity
SLIC device and the E1 function of the QLSLAC device enabled, the CD1 bit can be
demultiplexed into an Off-Hook/Ring Trip signal and Ground Key signal. In the demultiplex
mode, the second bit, Ground Key, takes the place of the CD2 as an input. The demultiplexed
bits can be debounced (CD1) or filtered (CD2) as explained previously. A more complete
description of CD1, CD2, debouncing, and filtering functions is contained in the Operating the
QLSLAC Device section on
Once the CD1 and CD2 inputs are processed (Debounced, Filtered and/or Demultiplexed) by
the QLSLAC device, the information can be accessed by the system in two ways in the PCM/
MPI mode: 1) on a per channel basis along with C3, C4, and C5 of the specific channel using
MPI Command 53h, or 2) by using MPI Command 4D/4Fh, which obtain the CD1 and CD2
bits from all four channels simultaneously. This feature reduces the processor overhead and
the time required to retrieve time-critical signals from the line circuits, such as off-hook and
ring trip. With this feature, hookswitch status and ring trip information, for example, can be
obtained from all four channels of a QLSLAC device with one read command.
In the GCI mode, the processed CD1 and CD2 inputs are transmitted upstream on the CD1
and CD2 bits for the respective analog channel, 1 or 2, using the C/I channel.
Control. C3, C4, and C5 are TTL-compatible programmable Input or Output (I/O) ports. They
can be used to monitor or control the state of the SLIC device or any other device associated
with subscriber line interface. The direction, input or output, is programmed using MPI
Command 54/55h or GCI Command SOP 8. As outputs, C3, C4, and C5 can be used to
control relays, illuminate LEDs, or perform any other function requiring a latched TTL
compatible signal for control. In PCM/MPI mode, the output state of C3, C4, and C5 is written
using MPI Command 52h. In GCI mode, the output state of C3, C4, and C5 is determined by
the C3, C4, and C5 bits contained in the down stream C/I channel for the respective analog
channel. As inputs, C3, C4, and C5 can be accessed by the system in PCM/MPI mode by
using MPI Command 53h. In GCI mode, C3 is transmitted upstream, along with CD1 and
CD2, for the respective analog channel using C3 of the C/I channel. Also, in GCI mode, C3,
C4, and C5 can be read along with CD1 and CD2 using GCI Command SOP 10.
The Le58QL061 QLSLAC device contains a single PCM highway or GCI Interface and five
programmable I/Os per channel (CD1, CD2, C3, C4, and C5) in a 44-pin PLCC or TQFP
package.
Control. Two additional outputs per channel are available on the Le58QL063VC device.
Chopper Clock. This output provides a 256 kHz or a 292.57 kHz, 50% duty cycle, TTL-
compatible clock for use by up to four SLIC devices with built-in switching regulators. The
CHCLK frequency is synchronous to the master clock, but the phase relationship to the
master clock is random. The chopper clock is not available in all package types.
Zarlink Semiconductor Inc.
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Description