Geehy Unveils GALT61120 Automotive Headlamp LED Matrix Controller with High-Resolution Flexible Dimming

时间： 2024-07-09 来源：Geehy Semiconductor Official Website

技术问答

Geehy has introduced the GALT61120, its first Automotive Headlamp LED Matrix Controller. This chip enables seamless transitions between high beam, low beam, and graphic display functions, along with brightness adjustment. It effectively enhances automotive lighting with long-distance illumination, flexible beam switching, and anti-glare capabilities. The GALT61120 is widely used in automotive headlamp systems, high-brightness LED matrix systems, ADB adaptive headlamps, animated daytime running lights, intelligent interactive matrix headlamps, and smart projection headlamps.

Independent Pixel-Level LED Control for Dynamic Adaptive Lighting

The GALT61120 is an enhanced analog ASIC chip featuring 12 channels grouped into four, each with three cascaded high-voltage switches. Each switch supports up to 1.5A current with low on-resistance (120mΩ per channel), reducing power consumption and heat by 40% compared to competitors. It independently drives 12 LEDs or LED strings, programmatically controlling four sub-strings for versatile lighting modes like high beam, low beam, daytime running, and turn signals while maximizing high-power LED performance.

High-Resolution Flexible Dimming & Innovating Car Lighting

Supporting programmable 10-bit PWM dimming, the GALT61120 enables independent PWM adjustment for each MOSFET. PWM synchronization is managed via hardware pin or instruction control, achieving precise 1024-level brightness control. Internal register adjustments optimize PWM phase configuration and support inter-device synchronization, ensuring seamless LED brightness adjustment. Enhanced EMI performance is achieved through optimized crystal oscillator and clock buffer driving strengths, enhancing intelligent driving lighting quality.

Rich Peripherals Enhance Safety and Visibility

Equipped with a built-in multi-point UART communication interface supporting up to 31 devices, the GALT61120 is CAN physical layer-compatible at speeds up to 1Mbps. It cascades up to 32 chips for synchronized far and near light matrix headlamp arrays and dynamic front light effects. An external I2C interface connects to EEPROM for storing lamp configurations and status. Two 8-bit ADCs with multiplexer inputs can provide temperature sensing for system compensation and over-temperature protection or serve as LED BIN processing to ensure consistent brightness and lamp temperature management.

Enhanced Security, Reliability, and Environmental Adaptability

The GALT61120 features LED open and short circuit detection and protection, ensuring fault-free lamp operation. It includes a CRC calculation unit for software fault detection and, a communication watchdog timer for monitoring timeouts. It meets AEC-Q100 Grade 1 reliability standards, operates in temperatures from -40℃ to 125℃, and boasts strong ESD interference resistance (HBM=±8000V, CDM=±2000V), outperforming international competitors in complex automotive environments.

Comprehensive Software and Hardware Support for One-Stop Design

The GALT61120 offers robust code portability and provides a range of entry-level development toolkits and embedded running environments, debugging and mass production evaluation kits, and localized technical support, such as upper computer software, power control board, application examples, data manuals, and development tool user manuals. Geehy also provides adaptive headlamp solutions integrated with automotive MCU, LED drivers, and ADB to accelerate product development and mass production.

GALT61120 is currently in mass production.

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