TPS929121-Q1

• AEC-Q100-qualified for automotive applications:
  • Temperature grade 1: –40°C to +125°C, T_A
• 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 < ±5% at 5 mA to 75 mA
  • High current accuracy < ±10% at 1 mA
  • Low voltage drop 500 mV at 50 mA
  • 12-bit independent PWM dimming
  • Programmable PWM frequency up to 20 kHz
  • Linear and exponential dimming method
• 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

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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.