Elmos has recently introduced the E522.46, a specialized driver chip designed for automotive interior LED lighting. This advanced chip features an 8-channel high-side driver, allowing individual LED classification data and configuration parameters to be stored in on-chip EEPROM. Using this stored information, the brightness of each LED can be adjusted via PWM input, enabling precise control over lighting intensity. Additionally, the E522.46 includes an analog dimming interface that allows for smooth brightness adjustments through an analog voltage signal.
The chip is equipped with an I2C interface, making it easy to connect to a host microcontroller. This enables the implementation of custom animations and user-friendly interfaces, offering greater flexibility for automotive lighting applications. The E522.46 supports a wide input voltage range from 3.3V to 32V (with a maximum of 42V) and can deliver up to 26.5mA per channel. Each channel offers 8-bit current resolution, ranging from 1mA to 26.5mA, and the chip can operate at temperatures as high as +165°C.
In terms of diagnostics, the E522.46 provides comprehensive monitoring capabilities, including overvoltage and undervoltage protection, on-chip temperature sensing, and detection of open or short circuits in LEDs. It is AEC-Q100 qualified, ensuring reliability for automotive environments, and is available in a compact DFN18L5040 package.
Key features of the E522.46 include:
- Input voltage range: 3.3V to 32V (up to 42V)
- 8-channel I2C programmable linear constant current LED driver
- Maximum output current of 200mA in parallel applications
- 8-bit adjustable LED current from 1mA to 26.5mA
- 8-bit PWM dimming function with calibration for LED classification
- All LED operating parameters and system configurations are stored in EEPROM
- Supports both digital PWM and analog dimming
- Integrated temperature sensor for LED monitoring
- Diagnostic features such as:
- Input voltage overvoltage/undervoltage monitoring
- On-chip temperature and forward voltage detection
- Single LED load open/short detection
The E522.46 is ideal for various automotive lighting applications, including interior ambient lighting, infotainment button backlighting, taillights, brake lights, and turn signals. It’s also suitable for industrial LED or RGB lighting systems where precision and reliability are essential. With its robust design and versatile functionality, the E522.46 is a powerful solution for next-generation automotive and industrial lighting systems.
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