Datasheet

LM3463

SNVS807A –MAY 2012–REVISED MAY 2013

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DC interface mode in cascade operation

In the DC interface mode, the master unit accepts four individual analog dimming control signals from external

signal sources (via the DIM01, DIM23, DIM4 and DIM5 pins) and encodes the analog signals into 8-bit serial

dimming control signals. The master LM3463 passes the encoded dimming control signals serially to the

following slave unit through its serial data output interface (SYNC and CLKOUT pins). Every slave unit shifts data

in and out bit by bit to its following slave unit.

Direct PWM dimming mode in cascade operation

In the Direct PWM Dimming mode, the master and slave units share the PWM dimming control signals at the

DIM01, DIM23, DIM4 and DIM5 pin to facilitate dimming control. In this mode, the SYNC and CLKOUT of all

slave units should be connected to the SYNC and CLKOUT pin of the master unit accordingly to perform startup

synchronization. Since the dimming control signal inputs of all the LM3464 are connected in parallel to share the

control signals, it is essential to ensure the signal source is strong enough to drive all the LM3463 in parallel.

Product Folder Links: LM3463