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Texas Instruments TPS929121AQPWPRQ1
- Part No.:
- TPS929121AQPWPRQ1
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 24-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
TPS929121AQPWPRQ1.pdf
- Description:
- IC LED DRV LIN PWM 75MA 24HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:6,000
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Product details
Overview
TPS929121AQPWPRQ1 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 - deployed in rear lighting, headlight pixel control, and cluster displays requiring robust off-board communication.
For engineers reviewing the TPS929121AQPWPRQ1 datasheet, TPS929121AQPWPRQ1 pinout, TPS929121AQPWPRQ1 application, or TPS929121AQPWPRQ1 equivalent, this page delivers verified technical context, validated pin functions, confirmed diagnostic capabilities (LED open/short detection, 8-bit ADC), and real-world automotive implementation constraints including fail-safe state programming and CAN transceiver LDO support.
Technical Context
The TPS929121AQPWPRQ1 implements a UART-based FlexWire interface with CRC and watchdog for EMC-robust off-board communication up to 1 MHz, supporting up to 16 devices on one bus and 8-byte frame transactions. Its 12 high-side current sources use external REF resistor and 2-bit global + 6-bit per-channel current scaling to achieve <±5% accuracy across 1–75 mA.
Each channel integrates independent 12-bit PWM dimming with linear/exponential methods, programmable fail-safe states via EEPROM, and diagnostics including LED open-circuit (200–600 mV threshold), short-to-ground (0.8–1.3 V), single-LED short detection, and overtemperature protection (160–190 °C trip). The integrated 5-V/80-mA LDO powers external CAN transceivers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 4.5 V to 40 V - supports direct automotive battery connection with jump-start and load-dump tolerance. |
| Channel Count & Type | 12 high-side constant-current outputs - enables independent pixel-level control of LED strings without external high-voltage switches. |
| Current Accuracy | ±5% at 5–75 mA - ensures consistent brightness across channels and temperature (–40°C to +125°C). |
| PWM Resolution & Frequency | 12-bit independent dimming, up to 20 kHz - eliminates audible noise and supports smooth animation in exterior lighting. |
| FlexWire Interface | UART-based, 1-MHz max clock, CRC + watchdog - provides CAN-physical-layer-compatible long-distance communication with fault resilience. |
| LDO Output | 5 V / 80 mA - powers external CAN transceivers (e.g., TCAN1042) without secondary regulator. |
| Diagnostic Coverage | LED open/short, single-LED short, supply undervoltage warning, overtemperature (160–190 °C), and 8-bit ADC - enables ASIL-B–compatible system monitoring. |
Pinout & Package
TPS929121AQPWPRQ1 is housed in a thermally enhanced HTSSOP-24 (PWP) package measuring 7.80 mm × 4.40 mm with exposed thermal pad for automotive-grade power dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 RX | FlexWire input | Asynchronous serial receive line for command frames; requires external pull-up for bus termination. |
| 2 VLDO | 5-V LDO output | Regulated 5-V supply for external CAN/LIN transceivers; supports up to 80 mA with 1–10 µF ceramic capacitor. |
| 3 GND | Ground reference | Primary analog/digital ground return; must be connected to low-impedance PCB plane adjacent to thermal pad. |
| 4 TX | FlexWire output | Open-drain transmit line; requires external 4.7-kΩ pull-up to VLDO or 5-V rail for proper logic levels. |
| 5 ERR | Open-drain fault indicator | Asserts low on any detected fault (open/short, overtemp, UVLO); shared across multiple devices on same bus. |
| 6,7 SUPPLY | Main power input | Dual pins reduce IR drop and improve thermal performance under 40-V automotive transients. |
| 8 FS | Fail-safe mode select | Hardware-configurable input (0/1) to choose between two pre-programmed fail-safe states during MCU loss. |
| 9 ADDR2/CLK | Address bit 2 or PWM clock | In external address mode: device ID bit; in internal mode: clock input for synchronized PWM timing. |
| 10 ADDR1/PWM1 | Address bit 1 or PWM input | Selects device address or provides PWM signal for OUT6–OUT11 when internal addressing enabled. |
| 11 ADDR0/PWM0 | Address bit 0 or PWM input | Selects device address or provides PWM signal for OUT0–OUT5 when internal addressing enabled. |
| 12 REF | Reference current setting | Connects external resistor (1–50 kΩ) to set full-scale current; also used for EEPROM programming and chip select. |
| 13–24 OUT0–OUT11 | High-side current outputs | 12 individually controlled constant-current sinks; each drives LED anodes with ≤700 mV dropout at 75 mA. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +125°C ambient operation with full electrical specs guaranteed - meets automotive front-end lighting reliability requirements. |
| Programmable fail-safe states | Two user-defined configurations stored in EEPROM activate automatically on FlexWire timeout - enables safe default behavior (e.g., all-off or partial-on) during MCU failure. |
| Integrated 5-V/80-mA LDO | Eliminates need for discrete 5-V regulator to power CAN transceivers, reducing BOM count and PCB area in distributed lighting modules. |
| Single-LED short-circuit detection | Distinguishes individual LED shorts within multi-LED strings - prevents false triggers from string-level faults and supports precise diagnostics in matrix lighting. |
| ADC-based supply monitoring | 8-bit ADC measures V(SUPPLY) and compares against programmable 5–20 V threshold - disables sensitive diagnostics during brownout to avoid misreporting. |
| FlexWire CRC and watchdog | Ensures data integrity and detects communication stalls in noisy automotive environments - recovers autonomously without host intervention. |
Applications
| Automotive Exterior Rear Light | Automotive Exterior Headlight |
|---|---|
Use Scenario: Dynamic sequential turn signals and brake light animations using individually addressable LED strings across taillight assemblies. IC Role / Device Role / Timing Role: High-side current driver with 12-bit PWM dimming and FlexWire-controlled channel sequencing - manages timing-critical animation patterns via synchronized frame updates. Use Value: Enables pixel-level brightness control and real-time reconfiguration without adding microcontrollers per module, reducing system latency and ECU load. |
Use Scenario: Adaptive driving beam (ADB) systems requiring independent control of dozens of LED segments for glare-free high-beam modulation. IC Role / Device Role / Timing Role: 12-channel constant-current source with <±5% matching and 20-kHz PWM - delivers precise luminance uniformity across segmented optics under varying thermal conditions. Use Value: Maintains photometric compliance across temperature (-40°C to +125°C) and supply (4.5–40 V), eliminating calibration drift in safety-critical forward lighting. |
| Automotive Interior Ambient Light | Automotive Cluster Display |
Use Scenario: Soft, tunable cabin lighting with smooth color transitions and localized dimming zones behind trim panels and door handles. IC Role / Device Role / Timing Role: High-side driver with linear/exponential dimming curves and fail-safe state memory - executes fade-in/fade-out effects using internal PWM timing without MCU polling. Use Value: Reduces software overhead by offloading dimming waveform generation to hardware, enabling seamless transitions even during ECU sleep modes. |
Use Scenario: TFT backlight control in digital instrument clusters where multiple LED strings require independent brightness tuning for contrast optimization. IC Role / Device Role / Timing Role: 12-channel driver with per-string current trimming and diagnostic feedback - compensates for LED aging and temperature gradients across display edges. Use Value: Sustains display uniformity over lifetime via closed-loop current adjustment and open-circuit detection, preventing dead zones in critical speed/tachometer regions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-channel automotive LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS929121QPWPRQ1 | Lower ADC voltage range (up to 20 V vs. 40 V); default EEPROM DEVADDR[3] = 0. | Limited to systems where supply monitoring above 20 V is unnecessary; less suitable for 48-V hybrid architectures. | Select when cost sensitivity outweighs extended ADC range and fail-safe flexibility. |
| TPS929120AQPWPRQ1 | 10-channel version; identical FlexWire interface, LDO, and diagnostics but fewer outputs. | Applicable where reduced channel count suffices (e.g., simpler rear lamps), lowering PCB layer count and routing complexity. | Choose for space-constrained modules needing only 10 channels and identical feature set otherwise. |
Compared with TPS929121QPWPRQ1 and TPS929120AQPWPRQ1, the TPS929121AQPWPRQ1 offers extended 40-V ADC coverage for full-battery-range monitoring and EEPROM-configurable DEVADDR[3]=1 for deterministic multi-device addressing - critical for scalable lighting networks with >8 nodes.
Availability
TPS929121AQPWPRQ1 is available at Aetrix Electronics and suitable for automotive exterior lighting, instrument cluster backlighting, and interior ambient lighting requiring stable component supply across extended temperature and voltage ranges.
Supply support for TPS929121AQPWPRQ1 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 AEC-Q100 qualification expertise and broad automotive system solutions.
The TPS929121AQPWPRQ1 belongs to TI's FlexWire LED driver family designed specifically for pixel-controlled automotive lighting - emphasizing EMC-hardened communication, fail-safe autonomy, and thermal resilience in harsh vehicle environments.
FAQ
What is the maximum supply voltage rating for the TPS929121AQPWPRQ1?
The TPS929121AQPWPRQ1 has an absolute maximum supply voltage of 45 V, with recommended operating range from 4.5 V to 40 V. This allows direct connection to 12-V and 24-V automotive batteries while surviving load-dump transients up to ISO 7637-2 Pulse 5a. Operation beyond 40 V is not supported in normal use and may trigger overvoltage protection or damage the device.
Does the TPS929121AQPWPRQ1 support standalone operation without a microcontroller?
Yes, the TPS929121AQPWPRQ1 supports standalone operation via its user-programmable EEPROM. When FlexWire communication is lost, the device automatically enters a preconfigured fail-safe state - which can include fixed PWM duty cycles, static current settings, or channel enable/disable patterns - all defined during manufacturing and retained across power cycles.
How does the TPS929121AQPWPRQ1 handle LED open-circuit detection?
The TPS929121AQPWPRQ1 detects LED open circuits by monitoring the voltage difference between SUPPLY and each OUTx pin. A rising threshold of 200–600 mV (with 100-mV hysteresis) triggers the fault, and the open-drain ERR pin pulls low. Detection is disabled below the programmable supply voltage threshold to prevent false alarms during brownout conditions.
Can the TPS929121AQPWPRQ1 drive LEDs in both constant-current and PWM modes simultaneously?
Yes, the TPS929121AQPWPRQ1 combines analog current setting (via REF resistor and CONF_REFRANGE) with independent 12-bit PWM dimming per channel. The analog current sets the full-scale amplitude, while PWM controls the effective duty cycle - enabling precise luminance control across 16-bit effective resolution without flicker or color shift.
What is the purpose of the VLDO pin on the TPS929121AQPWPRQ1?
The VLDO pin on the TPS929121AQPWPRQ1 provides a regulated 5-V output capable of delivering up to 80 mA. It is designed to power external CAN or LIN transceivers (e.g., TCAN1042), eliminating the need for a separate LDO in lighting modules. The output features internal current limiting, soft-start, and POR synchronization with the main supply.
TPS929121AQPWPRQ1 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
TPS929121AQPWPRQ1 FAQ
1.How can I place an order for TPS929121AQPWPRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS929121AQPWPRQ1 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 TPS929121AQPWPRQ1 reliable?
The price and inventory of TPS929121AQPWPRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS929121AQPWPRQ1 is usually 5 days.
3.What payment methods are accepted for TPS929121AQPWPRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS929121AQPWPRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS929121AQPWPRQ1?
TPS929121AQPWPRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS929121AQPWPRQ1 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 TPS929121AQPWPRQ1?
For technical support, including TPS929121AQPWPRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS929121AQPWPRQ1 requirements.
6.How does Aetrix verify that TPS929121AQPWPRQ1 is sourced from the original manufacturer or authorized distributors?
All TPS929121AQPWPRQ1 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 TPS929121AQPWPRQ1 meets industry standards.
7.What is the process for return or replacement of TPS929121AQPWPRQ1?
All TPS929121AQPWPRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with TPS929121AQPWPRQ1, 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 TPS929121AQPWPRQ1 part is unused and in its original packaging.
Return procedure for TPS929121AQPWPRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TPS929121AQPWPRQ1 Tags
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