LE9540CUQCT [Microchip]

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.

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