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TPS929121-Q1

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12-channel automotive 40-V high-side LED driver with FlexWire interface

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Data sheet

TPS929121-Q1

ACTIVE
Data sheet Order now

Product details

Number of channels 12 Topology Current Source Rating Automotive TI functional safety category Functional Safety-Capable 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
Number of channels 12 Topology Current Source Rating Automotive TI functional safety category Functional Safety-Capable 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
HTSSOP (PWP) 24 49.92 mm² 7.8 x 6.4
  • 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
  • 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.

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.
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TPS929120-Q1 ACTIVE 12-channel automotive 40-V high-side LED driver with FlexWire interface Low-supply detection threshold decreased to 5V

Technical documentation

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* Data sheet TPS929121-Q1 12-Channel Automotive 40-V High-Side LED Driver With FlexWire datasheet (Rev. A) PDF | HTML 05 Feb 2021
User guide TPS929xxx-Q1 Sample Code User's Guide PDF | HTML 10 Apr 2023
Technical article Here's how body electronics and lighting technology are changing the driving experience 26 Sep 2016
Technical article LED brightness adjustment: high-frequency PWM dimming 26 Aug 2016
Technical article Take better selfies with innovative LED flashes 18 Nov 2014
Technical article Solving the automotive EMI issues in new cars with all the screens 11 Sep 2014

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Evaluation board

TPS929120EVM — TPS929120-Q1 evaluation module for 12-channel automotive LED driver

The TPS929120-Q1 evaluation module (EVM) helps designers evaluate the operation and performance of TPS929120-Q1, a 12-channel 40-V high-side LED driver with FlexLED interface to individually control output current and PWM dutycycle for automotive lighting applications. It also has LED (...)
User guide: PDF
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Application software & framework

TPS92912XQ1-SW-F5529 — Reference code for TPS92912x-Q1 based on MSP430F5529 (MSP-EXP430F5529LP)

This reference code showcases the ability of the MSP430F5529 device to communicate with the TPS929120-Q1 and TPS929121-Q1 LED driver. The code configures the MCU using UART to drive 12 LEDs which is available on the TPS929120EVM.
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Supported products & hardware

Supported products & hardware

Products
Automotive LED drivers
TPS929120-Q1 — 12-channel automotive 40-V high-side LED driver with FlexWire interface TPS929121-Q1 — 12-channel automotive 40-V high-side LED driver with FlexWire interface
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GUI for evaluation module (EVM)

TPS929120EVM-GUI-SW — TPS929120EVM GUI

Supported products & hardware

Supported products & hardware

Products
Automotive LED drivers
TPS929121-Q1 — 12-channel automotive 40-V high-side LED driver with FlexWire interface
Hardware development
Evaluation board
TPS929120EVM — TPS929120-Q1 evaluation module for 12-channel automotive LED driver
Download
Calculation tool

SLVRBF8 — TPS92912x-Q1 EEPROM Configuration Tool

Supported products & hardware

Supported products & hardware

Products
Automotive LED drivers
TPS929120-Q1 — 12-channel automotive 40-V high-side LED driver with FlexWire interface TPS929121-Q1 — 12-channel automotive 40-V high-side LED driver with FlexWire interface
Download
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PSPICE-FOR-TI — PSpice® for TI design and simulation tool

PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
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HTSSOP (PWP) 24 View options
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