Microchip Technology, Inc. Dual Ch Ringing SLIC with Serial Interface LE9540

The Le9540 Dual Ringing SLIC device is a dual-channel device optimized to provide battery feed, ringing, and supervision on voice loops found in short-loop VoIP applications. This device is optimized with a serial bus to interface to the Broadcom BCM3383/84/85/90 cable SoCs and BCM6818/28/38 PON SoCs. The Le9540 device operates independently from a single, user-adjusted battery and a +3.3 V VCC per channel. Each channel provides 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 Dual Architecture Two fully independent integrated SLIC channel No impulse noise crosstalk in any operation states to the listening channel in forward or reverse active states Two Power Supplies Single user adjusted battery input per channel 3.3 V for VCC 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 Le9540D Up to -100 V ringing battery Le9540C Channel Independent 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) Per Channel Ringing Inputs for Optimized Interface to BCM SoC Devices Allows to accept driving signals from per channel 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