AS3820-ZLQT

Overview

The AS3820-ZLQT is a high-performance ambient light sensor (ALS) designed for mobile and wearable applications. It integrates a photodiode with spectral filtering to accurately measure illuminance in lux, mimicking human eye response. The device features an I2C interface for digital communication and supports multiple gain settings for wide dynamic range coverage. It operates within a standard voltage range and includes integrated infrared blocking to ensure color accuracy under various lighting conditions.

Feature Summary

• Human-eye matched spectral sensitivity for accurate lux measurement
• Integrated infrared blocking filter for enhanced color fidelity
• Digital I2C interface for simplified system integration
• Wide dynamic range capability through programmable gain settings

Applications

• Smartphone display brightness auto-adjustment
• Tablet and e-reader screen adaptation
• Wearable device ambient light detection
• IoT sensor nodes requiring illumination monitoring

Procurement Notes

Verify the specific suffix ZLQT indicates the correct tape-and-reel packaging configuration required for your assembly line. Confirm that the component meets RoHS and REACH compliance standards for your target market. Ensure the ordering part number matches the exact pinout and calibration data sheet version to avoid integration issues with existing firmware drivers.

Selection Notes

Choose this component when precise visible light measurement is critical for user experience optimization. It is suitable for space-constrained designs due to its small package footprint. Consider this part if your application requires robust rejection of infrared interference to maintain consistent performance across different LED and natural light sources without additional external filtering.

Part Context

This sensor belongs to the AS3820 family of ambient light sensors from ams-OSRAM. These devices are engineered for consumer electronics where power efficiency and accuracy are paramount. The family typically offers calibrated digital outputs, reducing the need for complex analog signal conditioning in the host system design.

Replacement Considerations

Check datasheets for direct pin-compatible alternatives such as the AS3820 variants with different suffixes. Verify functional equivalence regarding spectral response curves and I2C register maps before substituting. Ensure any replacement maintains the same operating voltage and current consumption profiles.

FAQ

Does the AS3820-ZLQT include an integrated IR filter?

Yes, the device features an integrated infrared blocking filter to improve color accuracy by rejecting non-visible light.

What communication interface does the AS3820-ZLQT use?

It uses a standard two-wire I2C digital interface for command and data transfer.