LED matrix manager applications for automotive headlight systems

Texas Instruments TPS92662A-Q1 LED Matrix Manager facilitates fully dynamic adaptive lighting solutions by giving individual pixel-level LED control. The device comprises four sub-strings of three series-connected integrated switches for bypassing individual LEDs. The individual sub-strings enable the device to receive either single or multiple current sources. The device provides a programmable Pierce crystal oscillator driver. Optimal performance is accomplished by choosing the driver strength based on the quartz crystal or ceramic resonator manufacturer's recommendations. The device also includes a selectable drive strength clock buffer. The rise and fall times and the EMI produced by a clock signal is controlled by varying the drive strength of the clock buffer. When needed, the clock buffer can be disabled to remove the noise produced by the clock signal and give the lowest EMI performance.

The device supports the multi-drop UART serial interface and is compatible with TPS92662-Q1 and TPS92663-Q1 devices. The I2C communication interface can be employed to read from and write to an external EEPROM that can store system calibration data. An onboard 8-bit ADC with two multiplexed inputs can be employed for system temperature compensation and utilised to measure a binning value, which provides for LED binning and coding. The internal charge pump rail provides the gate drive voltage for the LED bypass switches. The low on-resistance (RDS(on)) of the bypass switch reduces conduction loss and power dissipation. The two devices both include identical register settings for programming phase shift and pulse width of each individual LED in the string and for reporting LED open and short circuit faults. The devices are AEC-Q100 qualified for automotive applications.

Typical applications include automotive headlight systems, ADB or glare-free high beam, and sequential turn/animated daytime running lights.