TPS929121-Q1数据手册TI中文资料规格书

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