™
Le79231
Intelligent Subscriber Line Interface Circuit
VE790 Series
DESCRIPTION
APPLICATIONS
Enables a cost effective voice solution for long or short
loop applications providing POTS and integrated test
capabilities
The Le79231 ISLIC device, in combination with a VE790 series
ISLAC™ device, implements the telephone line interface
function. This enables the design of a low-cost, high
performance, fully software programmable line interface for
multiple country applications worldwide. All AC, DC, and
signaling parameters are fully programmable via
microprocessor or GCI interfaces on the VE790 series ISLAC
devices. Additionally, the Le79231 ISLIC device has integrated
self-test and line-test capabilities to resolve faults to the line or
line circuit. The integrated test capability is crucial for remote
applications where dedicated test hardware is not cost
effective.
— CO
— DLC
— PBX/KTS
— Pair Gain
FEATURES
Monitor of two-wire interface voltages and currents
supports
— Voice transmission
— Programmable DC feed characteristics
RELATED LITERATURE
–
–
Independent of battery
Current limited
080250 Le79Q2241x Quad ISLAC™ Device Data Sheet
081065 Le79228 Quad ISLAC™ Device Data Sheet
080262 VE790 Series Evaluation Board User’s Guide
080804 Le79R2xx/Le79Q224x Chip Set User’s Guide
080923 Le79R2xx/Le79228 Chip Set User’s Guide
— Selectable off-hook and ground-key thresholds
— Subscriber line diagnostics
–
–
–
–
–
Leakage resistance
Loop resistance
Line capacitance
Bell capacitance
Foreign voltage sensing
— Power cross and fault detection
Ring relay driver for external ringing
+5 V and battery supplies
BLOCK DIAGRAM
Dual battery operation for system power saving
Signal
Transmission
RSN
VTX
— Automatic battery switching
AD
SA
— Intelligent thermal management
Compatible with inexpensive protection networks
— Accommodates low tolerance fuse resistors or PTC
thermistors
Longitudinal
Control
Gain/Level
Shift
VLB
HPA
HPB
SB
Two-Wire
Interface
Attenuator
VSAB
VREF
Metering capable
BD
— 12 kHz and 16 kHz
— Smooth polarity reversal
Signal
Conditioning
IMT
ILG
Tip-open state supports ground start signaling
Integrated test load switches/relay drivers
Space Saving Package Options (8 x 8 QFN)
TMN
TMP
TMS
Thermal
Management
Control
CREF
Fault
Meas.
VBL
ORDERING INFORMATION
Switch Driver
A VE790 series ISLAC™ device must be used with this part.
VBH
Relay
Control
Device
Le79231JC
Le79231DJC
Package
R2
R3
RYE
Relay
Drivers
P1
P2
P3
LD
Input Decoder and
Control Registers
32-pin PLCC
Relay
Driver 1
R1
32-pin PLCC (Green package)1
32-pin QFN
Le79231QC2
Le79231FQC2
32-pin QFN (Green package)1
1. Green package meets RoHS Directive 2002/95/EC of the European
Council to minimize the environmental impact of electrical equipment.
2. Due to size constraints, QFN devices are marked by omitting the
“Le” prefix. For example, Le79231QC is marked 79231QC.
Document ID# 080248 Date:
Sep 19, 2007
2
Rev:
F
Version:
Distribution:
Public Document
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