HIGH-PERFORMANCE, HIGHLY PROGRAMMABLE INTEGRATED VOICE CHIP SET

The LE79252 device, in combination with an LE79252 SLAC 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 LE79252 SLAC devices. Additionally, the LE79252 device has integrated selftest 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.

• Monitor of two-wire interface voltages and currents supports
  • Voice transmission
  • Programmable DC feed characteristics
  • Independent of battery
  • Current limited
  • 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 Supports external ringing 3.3 V and battery supplies Dual battery operation for system power saving
  • Automatic battery switching
  • Intelligent thermal management Compatible with inexpensive protection networks
  • Accommodates low tolerance fuse resistors or PTC thermistors Metering capable
  • 12 kHz and 16 kHz
  • Smooth polarity reversal Tip-open state supports ground start signaling Integrated test load switch/relay drivers