LE9541DUQCT [Microchip]

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.

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