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Texas Instruments TPS929121QPWPRQ1
- Part No.:
- TPS929121QPWPRQ1
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 24-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
TPS929121QPWPRQ1.pdf
- Description:
- IC LED DRV LIN PWM 75MA 24HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,506
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Product details
Overview
TPS929121QPWPRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive 12-channel high-side LED driver with FlexWire interface, 4.5–40 V supply range, ±5% current accuracy at 5–75 mA per channel, and 12-bit independent PWM dimming up to 20 kHz-designed for pixel-level control in exterior headlight and rear lighting systems.
For engineers reviewing the TPS929121QPWPRQ1 datasheet, TPS929121QPWPRQ1 pinout, TPS929121QPWPRQ1 application, or TPS929121QPWPRQ1 equivalent, this page delivers verified technical context, validated pin functions, confirmed diagnostic capabilities (LED open/short detection, 8-bit ADC), and real-world automotive use cases aligned with TI's production-grade SLVSFZ4A specification.
Technical Context
The TPS929121QPWPRQ1 implements a UART-based FlexWire interface with CRC and watchdog, supporting up to 16 devices on one bus at ≤1 MHz clock rate and enabling off-board communication via CAN/LIN physical layers. Its digital core integrates EEPROM-programmable fail-safe state machine, configurable ADC voltage monitoring (5–20 V threshold), and dual-mode dimming (linear/exponential).
Each of the 12 high-side outputs features independent 6-bit current scaling (via REF resistor + CONF_REFRANGE) and 12-bit PWM control, with <500 mV dropout at 50 mA and overtemperature protection triggering at 160–190°C. Diagnostics include per-channel LED open-circuit detection (200–700 mV threshold), short-to-ground sensing (0.8–1.3 V), and single-LED short identification using ADC-based voltage sampling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 4.5 V to 40 V - supports direct connection to automotive battery with jump-start and load-dump tolerance. |
| Channel Current Accuracy | ±5% at 5–75 mA - ensures consistent brightness across LED strings without external calibration. |
| PWM Resolution & Frequency | 12-bit independent dimming, up to 20 kHz - eliminates audible noise and enables smooth animation in dynamic lighting. |
| FlexWire Interface | UART-based, ≤1 MHz, CRC + watchdog - provides robust, crystal-free, multi-drop communication compliant with automotive EMC requirements. |
| Diagnostic Coverage | LED open/short, single-LED short, supply undervoltage warning, overtemperature (160–190°C), ERR open-drain fault flag - enables ASIL-B–compatible system monitoring. |
| LDO Output | 5 V ±5%, 80 mA - powers external CAN transceivers (e.g., TCAN1042) without secondary regulator. |
| Package | HTSSOP-24 (7.8 mm × 4.4 mm) with PowerPAD™ - optimized thermal performance (RθJA = 35°C/W) for under-hood mounting. |
Pinout & Package
TPS929121QPWPRQ1 is housed in a thermally enhanced HTSSOP-24 package (PWP) with exposed thermal pad, measuring 7.80 mm × 4.40 mm, rated for –40°C to +125°C ambient operation and qualified to AEC-Q100 Grade 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 RX | FlexWire input | Asynchronous serial data input; accepts 0–5 V logic, supports multi-drop bus with CRC validation. |
| 2 VLDO | 5-V LDO output | Regulated 5 V supply for external CAN transceiver; 80 mA capable with 1–10 µF ceramic capacitor support. |
| 3 GND | Ground reference | Common return for analog/digital circuits and thermal pad; must be connected to PCB ground plane. |
| 4 TX | FlexWire output | Open-drain UART output; requires external pull-up; drives 0–5 V logic with 5 mA sink capability. |
| 5 ERR | Open-drain fault indicator | Asserts low on any fault (open/short, UVLO, overtemp); shared across multiple devices on same bus. |
| 6,7 SUPPLY | Main power input | Dual pins for low-impedance 4.5–40 V supply connection; supports high-current LED loads and EMC filtering. |
| 8 FS | Fail-safe state select | Hardware-configurable input (0/1) to choose between two pre-programmed EEPROM fail-safe states. |
| 9 ADDR2/CLK | Address bit 2 / PWM clock | In external address mode: device ID bit; in internal mode: PWM clock input for OUT6–OUT11. |
| 10 ADDR1/PWM1 | Address bit 1 / PWM input | In external mode: device ID bit; in internal mode: PWM signal for OUT6–OUT11 channels. |
| 11 ADDR0/PWM0 | Address bit 0 / PWM input | In external mode: device ID bit; in internal mode: PWM signal for OUT0–OUT5 channels. |
| 12 REF | Current reference setting | Connects external resistor (1–50 kΩ) to set full-scale current; also used for EEPROM programming chip-select. |
| 13–24 OUT0–OUT11 | High-side constant-current outputs | 12 individually programmable current sources; each supports 0.5–75 mA with <500 mV dropout at 50 mA. |
Key Features
| Feature | Design Value |
|---|---|
| FlexWire interface with CRC and watchdog | Enables reliable, crystal-free, multi-drop communication up to 1 MHz-eliminates need for external oscillator and reduces BOM cost. |
| EEPROM-programmable fail-safe states | Two user-defined configurations (e.g., all-off or partial-on) automatically activated during MCU loss-supports ASIL-B functional safety goals. |
| Integrated 5-V, 80-mA LDO | Powers external CAN transceivers directly-removes requirement for discrete 5-V regulator in lighting control modules. |
| Per-channel diagnostics with ADC | Real-time voltage sampling enables LED open-circuit, short-to-ground, and single-LED short detection-reduces need for external sense resistors. |
| 12-bit independent PWM + 6-bit analog current control | Supports both high-resolution dimming and precise current trimming-enables pixel-level brightness uniformity in adaptive driving beam (ADB) systems. |
Applications
| Automotive Exterior Headlight | Automotive Exterior Rear Light |
|---|---|
Use Scenario: Adaptive Driving Beam (ADB) systems requiring individual control of 12+ LED segments for glare-free high-beam projection. IC Role / Device Role / Timing Role: High-side current driver with 12-bit PWM dimming and real-time diagnostics-serves as pixel-level light engine controller. Use Value: Enables dynamic beam shaping without mechanical shutters; ±5% current accuracy ensures consistent lumen output across temperature. |
Use Scenario: Sequential turn signals and brake-light animations using independently addressable LED strings on rear lamp assemblies. IC Role / Device Role / Timing Role: 12-channel constant-current source with FlexWire interface-coordinates timing and intensity across distributed PCBs. Use Value: Eliminates EMC issues from long cable runs via CAN-physical-layer FlexWire; supports >1-MHz update rates for smooth animation. |
| Automotive Cluster Display | Automotive Interior Ambient Light |
Use Scenario: Backlighting for TFT instrument clusters with localized dimming zones and dynamic contrast enhancement. IC Role / Device Role / Timing Role: High-accuracy current source with 12-bit PWM-drives RGB or white LED zones with synchronized brightness control. Use Value: 500 mV dropout at 50 mA allows operation at low supply voltages (e.g., 5.5 V), extending display functionality during cold-crank conditions. |
Use Scenario: Multi-zone cabin lighting with programmable color temperature and intensity gradients across door panels, footwells, and overhead consoles. IC Role / Device Role / Timing Role: Fail-safe-enabled LED driver with EEPROM-stored ambient profiles-maintains safe illumination levels during MCU failure. Use Value: Pre-programmed fail-safe states (e.g., soft white at 20% brightness) meet UNECE R149 interior lighting safety requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-side LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS929120QPWPRQ1 | ADC input range limited to 20 V; lower supply undervoltage threshold (5–20 V vs. 10–40 V) | Suitable for 12 V-only systems without 24 V compatibility or wide-range supply monitoring | Select when ADC monitoring only required up to 20 V and cost optimization is prioritized over extended supply range. |
| TPS929121AQPWPRQ1 | EEPROM default address bit EEP_DEVADDR[3] = 1 (vs. 0); identical electrical specs and pinout | Enables parallel use of both variants on same FlexWire bus without address conflict | Choose for multi-device designs requiring >16 nodes-pairs with TPS929121QPWPRQ1 to double address space. |
Compared with TPS929120QPWPRQ1, TPS929121QPWPRQ1 offers broader ADC coverage (up to 40 V) and higher supply voltage tolerance-critical for 24 V commercial vehicle integration. Against TPS929121AQPWPRQ1, it provides complementary device addressing, enabling scalable lighting node expansion without bus arbitration changes.
Availability
TPS929121QPWPRQ1 is available at Aetrix Electronics and suitable for automotive exterior headlight, rear lighting, and cluster display applications requiring stable component supply, AEC-Q100 compliance, and long-term lifecycle support.
Supply support for TPS929121QPWPRQ1 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and automotive ICs, with decades of automotive qualification expertise and ISO/TS 16949-certified manufacturing.
The TPS929121QPWPRQ1 belongs to TI's FlexWire automotive LED driver family, engineered specifically for EMC-robust, pixel-controlled lighting in ASIL-B systems-emphasizing fail-safe operation, diagnostic completeness, and CAN-physical-layer interoperability.
FAQ
What is the maximum number of TPS929121QPWPRQ1 devices supported on a single FlexWire bus?
The TPS929121QPWPRQ1 supports up to 16 devices on one FlexWire bus, enabled by its 4-bit address space (ADDR0–ADDR2 plus EEPROM-configurable ADDR3). Each device requires unique address assignment via hardware pins or EEPROM programming; bus termination and signal integrity must be maintained per TI's SLVSFZ4A layout guidelines.
Does TPS929121QPWPRQ1 require an external crystal oscillator for FlexWire operation?
No, the TPS929121QPWPRQ1 does not require an external crystal oscillator. Its FlexWire interface uses an internal 32.15 MHz oscillator with ±2.5% tolerance, synchronized via a dedicated frame structure-eliminating crystal cost, board space, and EMC concerns while maintaining UART compatibility.
How does the fail-safe feature of TPS929121QPWPRQ1 operate during MCU communication loss?
Upon loss of FlexWire communication, the TPS929121QPWPRQ1's EEPROM-programmable fail-safe state machine activates a pre-configured output state (e.g., all OFF or selective ON) within milliseconds. The FS pin selects between two stored states, and watchdog timeout duration is configurable-ensuring predictable behavior per ISO 26262 ASIL-B requirements.
What is the role of the REF pin on TPS929121QPWPRQ1, and what resistor value sets 75 mA per channel?
The REF pin on TPS929121QPWPRQ1 connects to an external resistor that sets the full-scale current reference. With CONF_REFRANGE = 11b (default), a 8.45 kΩ resistor yields 75 mA per channel (IOUT = 1.235 V × 512 / RREF). Resistor tolerance directly impacts channel accuracy-TI recommends 0.5% metal-film for ±5% total error.
Can TPS929121QPWPRQ1 drive LEDs directly from a 24-V truck battery without additional regulation?
Yes, TPS929121QPWPRQ1 supports 4.5–40 V supply voltage, making it compatible with 24 V commercial vehicle batteries including load-dump transients. Its 40 V absolute maximum rating, integrated overvoltage protection, and 500 mV dropout at 50 mA enable direct connection-no pre-regulator needed for standard LED string configurations.
TPS929121QPWPRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 24-PowerTSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Linear
- Topology:
- Constant Current
- Internal Switch(s):
- No
- Number of Outputs:
- 12
- Voltage - Supply (Min):
- 4.5V
- Voltage - Supply (Max):
- 40V
- Voltage - Output:
- 0V ~ 5V
- Current - Output / Channel:
- 75mA
- Frequency:
- 10kHz ~ 1MHz
- Dimming:
- Analog, PWM
- Applications:
- -
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-HTSSOP
TPS929121QPWPRQ1 FAQ
1.How can I place an order for TPS929121QPWPRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS929121QPWPRQ1 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for TPS929121QPWPRQ1 reliable?
The price and inventory of TPS929121QPWPRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS929121QPWPRQ1 is usually 5 days.
3.What payment methods are accepted for TPS929121QPWPRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS929121QPWPRQ1 transactions.
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4.How is shipping managed for TPS929121QPWPRQ1?
TPS929121QPWPRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS929121QPWPRQ1 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for TPS929121QPWPRQ1?
For technical support, including TPS929121QPWPRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS929121QPWPRQ1 requirements.
6.How does Aetrix verify that TPS929121QPWPRQ1 is sourced from the original manufacturer or authorized distributors?
All TPS929121QPWPRQ1 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that TPS929121QPWPRQ1 meets industry standards.
7.What is the process for return or replacement of TPS929121QPWPRQ1?
All TPS929121QPWPRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with TPS929121QPWPRQ1, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The TPS929121QPWPRQ1 part is unused and in its original packaging.
Return procedure for TPS929121QPWPRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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