Multi-pixel driver with CAN FD Light powers next-generation automotive rear lamp designs

The STMicroelectronics L99LDLH32 provides 32 regulated current sources, enabling the creation of complex light patterns and effects in safety-critical lamps such as turn indicators.

The L99LDLH32 from STMicroelectronics is a linear current regulator which provides a convenient, integrated solution for driving dynamic automotive lighting. It supports the streamlined CAN FD Light protocol. 

Ideal for use with OLED lamps, which provide bright, homogeneous, and high-contrast lighting from a small surface area, the new L99LDLH32 driver lets designers produce complex light patterns and effects that enhance safety and styling.

Featuring 32 regulated current sources with independently programmable outputs ranging from 1 mA to 15 mA, the L99LDH32 can drive individual pixels in external and interior lighting applications. It can also perform global dimming in 8-bit resolution. Operating from an input at the vehicle battery’s voltage, the driver produces outputs of up to 35 V, sufficient to cover a wide spread of emitter forward voltages.

The integrated CAN FD Light protocol handler and transceiver simplify connection to the vehicle’s communication infrastructure and the domain’s electronic control unit. The CAN FD Light protocol’s synchronized commander/responder communication, intended for the control of simple devices such as lights and sensors, eliminates the need for costly external components such as timing crystals. Data bandwidth of 1 Mbit/s enables designers to create complex animated light patterns, and permits smoothly modulated transitions and dimming.

The L99LDH32 can operate in a failsafe stand-alone mode in case the communication bus or controller malfunction. The driver is supplied in a 7 mm x 7 mm QFN48 package with wettable flanks and an exposed thermal pad to aid heat dissipation.

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