Elmos E522.88

The E522.88 is a multi-channel PWM driver for light application. It provides 16 current sinks with integrated 10bit PWM generator for each channel. Each of the drivers can digitally be configured to drive up to 100mA with a selectable slew rate. The device provides a simple instruction set to control the LED channels. The instruction set can be used to generate up to 8 unique light functions. These lighting functions can be triggered using up to 5 discrete pins. The device provides OTP memory to store the application specific sequences of instructions. An advanced device power management feature allows LED channel bundling with automatic current balancing to external resistors resulting in reduced device power dissipation. Various diagnostic features, like LED open, short condition detection and temperature sensor, are provided to meet automotive requirements. To protect the device from thermal damage, the device implements a configurable LED supply and device temperature dependent automatic LED current derating.

Key features

• Operating input voltage range 5.5V to 32V, max. 40V
• 16 programmable LED drivers up to 100mA
• LED driver current selection step size of 100uA
• Customizable supply and temperature dependent LED current de-rating
• Advanced Thermal Management: Power Zeroing
• Up to 8 custom sequences
• Standalone operation
• Different Light Functions per Device supported
• 16 PWM generators with 10bit resolution
• 10bit ADC for LED open, short and system diagnosis
• Developed according ISO26262 supporting applications up to ASIL B

Applications

• Brake Light
• Tail Light
• Turn Indicator
• Basic animations

Evaluation board block diagram