Microchip Technology, Inc. Single Ch Ringing SLIC with Serial Interface LE9541

The Le9541 Single Ringing SLIC device is optimized for single channel designs to provide battery feed, ringing, and supervision on voice loops found in short-loop VoIP applications. This device utilizes a serial bus to interface to the Broadcom BCM3383/84/85/90 cable SoCs and BCM6818/28/38 PON SoCs. The Le9541 device operates independently from a single, user-adjusted battery and a +3.3 V VCC providing forward and reverse battery feed, voice transmission, power ringing, an ultra low-power scan state, ground start (Tip open), and a disconnect state. A test load switch is also included to support integrated test algorithms. Additional Features Single Channel High Voltage Ringing SLIC Functionally Equivalent of Le9540 One Channel Operation Control and Status Report through Serial Interface with Reset SLIC Operation State / DC Current Limit / Test Load Enable DC Loop Closure / Ring Trip / Thermal Shutdown High Voltage Design Meets Comcast Ringing requirements without clipping distortion Robust solution with no damage during extended ringing cycles or switching the ringer on and off Allows use of 50 Ohm protection resistors and lower cost lower current rated protectors Up to -145 V ringing battery Le9541D Up to -100 V ringing battery Le9541C Eight Operating States Scan state for minimal power dissipation Active Forward Battery (Default Power Up State) Active Forward Battery ICV Active Reverse Battery Tip Open Ground Start Wink Ringing Disconnect (Default Power Up Mode) Ringing Inputs for Optimized Interface to BCM SoC Devices Allows to accept driving signals from voice outputs as well as from PWM outputs Ultra-Low On-Hook Power Loop Start, Ring Trip, and Ground Start Detections Loop closure detection with hysteresis to minimize dial pulse distortion Thermal Shutdown Protection with Hysteresis Test Load Switch Supports integrated test algorithms