描述 Description

With increasing demand for animation in automotive lighting, LEDs must be controlled independently. Therefore, LED drivers with digital interfaces are essential to effectively drive pixel-controlled lighting applications. In exterior lighting, multiple lamp functions are typically located on different PCB boards with off-board wires connected to each other. It is difficult for a traditional single-ended interface to meet the strict EMC requirements. By using an industrial-standard CAN physical layer, the UART-based FlexWire interface of the TPS929121-Q1 easily accomplishes long distance off-board communication without impacting EMC.

The TPS929121-Q1 is a 12-channel, 40-V high-side LED driver that controls the 8-bit output current and 12-bit PWM duty cycles. The device meets multiple regulation requirements with LED open-circuit, short-to-ground, and single LED short-circuit diagnostics. A configurable watchdog also automatically sets fail-safe states when the MCU connection is lost, and, with programmable EEPROM, TPS929121-Q1 can flexibly be set for different application scenarios.

特性 Features

? AEC-Q100-qualified for automotive applications:
? Temperature grade 1: –40°C to +125°C, TA

? 12-channel precision high-side current output:
? Supply voltage 4.5 V to 40 V
? Up to 75-mA channel current set by resistor
? 2-bit global, 6-bit independent current setting
? High current accuracy
? FlexWire control interface
? Up to 1-MHz clock frequency
? Maximum 16 devices on one FlexWire bus
? Up to 8-bytes data transaction in one frame
? 5-V LDO output to supply CAN transceiver

? Diagnostic and protection:
? Programmable fail-safe state
? LED open-circuit detection
? LED short-circuit detection
? Single-LED short-circuit diagnostic
? Programmable low-supply detection
? Open-drain ERR for fault indication
? Watchdog and CRC for FlexWire interface
? 8-Bit ADC for pin voltage measurement
? Overtemperature protection