| Number of channels (#) | 12 |
| Topology | Current Source |
| Rating | Automotive |
| Operating temperature range (C) | -40 to 125 |
| | |
| Vin (Min) (V) | 4.5 |
| Vin (Max) (V) | 40 |
| Iout (Max) (A) | 0.075 |
| Iq (Typ) (mA) | 10 |
| Features | Enable/Shutdown, Fault Detection, Fault Diagnostic, LED Open Detection, LED Short to Ground Detection, LED Weak Supply Diagnostics, PWM Dimming, Reference Resistor Open or Short Detection, Thermal Error Flag, Thermal Prewarning and Shutdown, Thermal Shutdown |
- 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 < ±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
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.
