Microchip Technology, Inc. Single Ch Ringing SLIC with Serial Interface LE9551

The LE9551 Single Channel Ringing SLIC device provides 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 Le9551 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 Tiny 4x5mm 28-pin QFN package for single channel designs Functional Equivalent of Le9541 in smaller package 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 Le9551D Up to -100 V ringing battery Le9551C Eight Operating States Scan state for minimal oh-hook 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 Supports 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