Configurable IC Simplifies Control Of Animated LED Turn Signals

by Muhammad Saqib and Aamir Hussain Chughtai, Dialog Semiconductor, Lahore, Pakistan, How2Power Today, Apr 15 2019

Focus:
Many automotive manufacturers now provide indicator lights (turn signals) with animated LED patterns. The animations can be implemented using several discrete ICs to generate the control signals in combination with an LDO regulator and one or more LED drivers. An alternative approach to generating the LED control signals using the SLG46620 configurable mixed signal IC (CMIC) provides greater flexibility along with reductions in PCB footprint and bill-of- materials cost. This article describes how to generate three different animated LED patterns using the SLG46620. After a brief explanation of the cost savings, two system design schemes are presented using a single-channel and a multi-channel LED driver, respectively. Then the article explains how the CMIC can be configured as a 16-state Moore machine to generate the three example LED patterns. Key design equations are presented and performance of the design examples is verified experimentally.

What you’ll learn:

• How to generate the control signals for animated LED automotive turn signals using the SLG46620 configurable mixed signal IC

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