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Texas Instruments TPIC84125TPWPRQ1
- Part No.:
- TPIC84125TPWPRQ1
- Manufacturer:
- Texas Instruments
- Category:
- RFID, RF Access, Monitoring ICs
- Package:
- 28-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
TPIC84125TPWPRQ1.pdf
- Description:
- IC PASS ENTRY 125KHZ 28HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,043
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Product details
Overview
TPIC84125TPWPRQ1 from Texas Instruments is an automotive-grade low-frequency antenna driver IC for passive entry and passive start (PEPS) systems. It integrates eight programmable half-bridge MOSFET drivers, linear-mode sine-wave generation at 125 kHz, SPI-controlled gain staging (Gain1/Gain2/Destroy), and real-time current measurement per output channel - enabling precise magnetic field control across vehicle-mounted LF antennas.
For engineers reviewing the TPIC84125TPWPRQ1 datasheet, TPIC84125TPWPRQ1 pinout, TPIC84125TPWPRQ1 application, or TPIC84125TPWPRQ1 equivalent, this device supports ASK-modulated 125 kHz transmission with programmable timing, fault-aware tri-state protection, and diagnostic-ready current sensing - critical for secure keyless access and engine start system design.
Technical Context
The TPIC84125TPWPRQ1 implements a dedicated LF signal chain: an internal clock divider (default /8) converts CLK_IN (16 MHz) to 2 MHz for logic and sine-wave synthesis; the sine-wave generator produces a clean 125 kHz carrier derived from VA supply voltage, with amplitude controlled by Gain1 (1–32 Vpp), Gain2 (1–32 Vpp), and destroy-bit gain (32/(2⁶) Vpp = 0.5 Vpp).
Each of its eight outputs supports configurable bridge modes (half/full/parallel), phase selection (0°/180°), and independent current monitoring via sequential ADC sampling on LS transistors - with programmable timer1/timer2 (750 ns–255.25 µs resolution) and edge-triggered measurement timing aligned to Manchester-encoded data bits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Frequency | 125 kHz carrier generation with ASK modulation - enables RFID key communication in automotive PEPS systems. |
| Output Channels | 8 programmable outputs, each configurable as half-bridge, full-bridge, or parallel bridge - supports multi-antenna vehicle coverage. |
| Supply Voltages | VS: 5.5–38 V (power stage); VA/VD: 4.5–5.5 V (analog/digital rails) - ensures robust operation across battery voltage fluctuations. |
| Current Sensing | 5-bit ADC per LS transistor with programmable timing (750 ns–255.25 µs) - enables accurate open/short-to-rail diagnostics per antenna coil. |
| Protection Features | Over-temperature shutdown, VS/VD under-voltage lockout, IFAULT detection (150 mA DC / 0.9 A peak bi-directional) - prevents thermal runaway and coil damage. |
| SPI Interface | 64-bit frame (8-bit command + 56-bit data), slave mode, NCS/SCLK/SDI/SDO - allows full register control and CSR readback without external logic. |
| Temperature Range | –40°C to +105°C - qualified for under-hood and door module mounting locations in automotive applications. |
Pinout & Package
HTSSOP-28 (PWP) package with exposed thermal pad requiring PCB ground connection. Pin count and layout match TI's standard PWP footprint for mechanical compatibility and thermal management.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VS (Pins 15,21,22,28) | Power supply input | Must be connected to all four pins; supplies high-current output stage (up to 38 V, 3 A peak per channel). |
| Out1–Out8 (Pins 27,26,24,23,20,19,17,16) | Bridge output terminals | Eight independent half-bridge outputs; support full-bridge pairing (e.g., Out1+Out2) and destroy-bit activation on inactive channels. |
| VA (Pin 5), VD (Pin 9) | Analog & digital supply | VA sets sine-wave amplitude accuracy and ADC reference; VD powers digital logic; both must be tied together to avoid latch-up. |
| RBIAS (Pin 6) | Bias reference node | Connects to 62 kΩ, 1%, 50 ppm resistor - determines ADC reference scaling and bias current for measurement consistency. |
| CLK_IN (Pin 10), SDO/SDI/SCLK/NCS (Pins 11–14) | SPI + clock interface | Enables full configuration, status readback, and real-time control of transmission timing, gain, and diagnostics. |
| VS/2 (Pin 1) | Internal decoupling node | Requires 100 nF, 10%, ESR < 50 mΩ capacitor - stabilizes internal voltage reference for analog performance. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable Gain Staging | Independent Gain1 (1–32 Vpp), Gain2 (1–32 Vpp), and destroy-bit gain (0.5 Vpp default) - enables dynamic power control during telegram transmission and EMI-safe termination. |
| Real-Time Current Diagnostics | Per-output LS current measurement with 5-bit resolution and programmable sampling window (750 ns–255.25 µs) - detects open load, short-to-GND, and short-to-VBAT on each antenna coil. |
| Configurable Bridge Topology | Each output supports half-bridge, full-bridge, or parallel-bridge configuration via SPI - adapts to diverse antenna impedance and field-strength requirements. |
| Fault-Aware Tri-State Protection | Automatic channel disable on over-temperature, under-voltage, or IFAULT events - preserves system integrity while flagging faults in Control and Status Register (CSR). |
| Low-EMI Linear Output Stage | Sine-wave generation in linear mode (not switching) - reduces radiated emissions and simplifies EMC filtering in safety-critical vehicle access systems. |
Applications
| Passive Entry Door Handle Antenna | Passive Start Ignition Coil |
|---|---|
Use Scenario: Detects authorized key fob within 1–2 meters of front/rear door handle and initiates unlock sequence. IC Role / Device Role / Timing Role: TPIC84125TPWPRQ1 drives LF antenna coil with 125 kHz ASK-modulated signal; measures coil current to verify antenna integrity before transmission. Use Value: Enables reliable proximity detection with built-in short/open diagnostics - eliminating false triggers caused by damaged or detuned antennas. | Use Scenario: Activates engine start sequence when driver sits inside cabin and presses ignition button, using seat-integrated LF antenna. IC Role / Device Role / Timing Role: TPIC84125TPWPRQ1 generates synchronized 125 kHz carrier across multiple coils; uses Gain2 to boost initial authentication burst and destroy bits to suppress residual coupling. Use Value: Ensures deterministic RF field establishment and rapid signal termination - meeting ISO 14230 security timing requirements for key validation. |
| Trunk Release Antenna Module | Smart Key Fob Programming Interface |
Use Scenario: Enables hands-free trunk opening when authorized fob is detected near rear bumper. IC Role / Device Role / Timing Role: TPIC84125TPWPRQ1 configures Out5–Out8 as parallel bridges to drive large-area trunk antenna; monitors current to detect coil detachment or moisture ingress. Use Value: Delivers sufficient magnetic field strength (>10 A/m) at 1.5 m range while maintaining diagnostic coverage - supporting IP67-rated enclosure designs. | Use Scenario: Used in dealership programming stations to write cryptographic keys into new fobs via LF coupling. IC Role / Device Role / Timing Role: TPIC84125TPWPRQ1 operates in high-accuracy linear mode with fixed Gain1 (28 Vpp) and calibrated RBIAS; provides stable carrier for bidirectional data exchange. Use Value: Guarantees bit-error-rate < 10⁻⁶ during key provisioning - enabled by VA-referenced sine-wave stability and low-noise current sensing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-frequency antenna driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPIC84124TPWPRQ1 | 4-channel version; identical architecture, register map, and pinout subset - shares same PWP-28 package but with fewer outputs. | Targeted for cost-sensitive single-zone PEPS (e.g., driver-side only), not full-vehicle coverage. | Select when antenna count ≤ 4 and board space/layout reuse of TPIC84125TPWPRQ1 is required. |
| NXP UJA1075ATW/3V3/1 | Integrated LIN transceiver + LF driver; 125 kHz output with fixed 16 Vpp, no Gain2/destroy-bit control; requires external current sense. | Designed for LIN-connected body domain controllers - lacks autonomous diagnostics and flexible gain staging. | Select when system uses LIN bus for host communication and simplified LF functionality suffices. |
Compared with TPIC84125TPWPRQ1, TPIC84124TPWPRQ1 reduces channel count without altering timing or diagnostic capability, while UJA1075ATW/3V3/1 trades programmability for integration with LIN - making TPIC84125TPWPRQ1 the only option supporting full 8-channel, gain-staged, and self-diagnosing PEPS antenna control.
Availability
TPIC84125TPWPRQ1 is available at Aetrix Electronics and suitable for automotive passive entry, passive start, and smart key programming applications requiring stable component supply, AEC-Q100 Grade 1 qualification, and long-term production continuity.
Supply support for TPIC84125TPWPRQ1 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 company specializing in analog, embedded processing, and automotive ICs, with decades of leadership in automotive electronics and functional safety solutions.
The TPIC84125TPWPRQ1 belongs to TI's automotive antenna driver product line, engineered specifically for secure, diagnostics-rich passive entry and passive start systems - emphasizing magnetic field precision, fault resilience, and SPI-based system integration.
FAQ
What is the primary function of the TPIC84125TPWPRQ1 in automotive systems?
The TPIC84125TPWPRQ1 serves as a dedicated low-frequency (125 kHz) antenna driver IC for passive entry and passive start (PEPS) systems. It generates ASK-modulated magnetic fields via up to eight programmable half-bridge outputs, performs real-time current-based diagnostics on each antenna coil, and communicates with the host microcontroller via SPI - enabling secure, reliable keyless vehicle access and engine start functionality. Its design centers on field strength accuracy, fault detection, and electromagnetic compatibility in automotive environments.
How does the TPIC84125TPWPRQ1 implement antenna diagnostics?
The TPIC84125TPWPRQ1 performs per-output low-side current measurement using an integrated 5-bit ADC with programmable sampling timing (750 ns–255.25 µs). It detects open load, short-to-GND, and short-to-VBAT conditions by comparing measured current against expected values during active transmission. Diagnostic results are stored in the Control and Status Register (CSR) and flagged for host MCU readout via SPI - enabling automated antenna health verification before and during RF transmission sequences.
Can the TPIC84125TPWPRQ1 drive full-bridge antenna configurations?
Yes, the TPIC84125TPWPRQ1 supports full-bridge operation by pairing two outputs (e.g., Out1 and Out2) to drive a single antenna coil differentially. Each output is independently configurable via SPI for phase (0°/180°), gain (Gain1/Gain2), and function (data/destroy). The device also allows simultaneous activation of up to two full-bridges in normal mode, while other outputs can transmit destroy bits at reduced amplitude - ensuring clean signal termination and minimal cross-coupling between antennas.
What are the supply voltage requirements for the TPIC84125TPWPRQ1?
The TPIC84125TPWPRQ1 requires three separate supply domains: VS (5.5–38 V) powers the high-current output stage and must be connected to all four VS pins; VA and VD (4.5–5.5 V each) supply analog and digital circuitry respectively - and must be tied together to prevent latch-up. Additionally, a 62 kΩ precision resistor at RBIAS and a 100 nF capacitor at VS/2 are mandatory for accurate current measurement and internal reference stability.
Does the TPIC84125TPWPRQ1 support programmable transmission timing and gain control?
Yes, the TPIC84125TPWPRQ1 provides granular SPI-based control over transmission timing and gain. It supports three independent gain settings: Gain1 (1–32 Vpp) for main telegram transmission, Gain2 (1–32 Vpp) for programmable initial burst segments, and destroy-bit gain (0.5–32 Vpp) for post-transmission signal suppression. Timing parameters - including counter for start of Gain2, length of Gain2 bits, and destroy-bit timing - are fully configurable in the Configuration Register to meet ISO 14230 and OEM-specific protocol requirements.
TPIC84125TPWPRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 28-PowerTSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Passive Entry/Start
- Frequency:
- 125kHz
- Standards:
- -
- Interface:
- SPI
- Voltage - Supply:
- 7V ~ 38V
- Operating Temperature:
- -40°C ~ 105°C
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-HTSSOP
TPIC84125TPWPRQ1 FAQ
1.How can I place an order for TPIC84125TPWPRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for TPIC84125TPWPRQ1 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 TPIC84125TPWPRQ1 reliable?
The price and inventory of TPIC84125TPWPRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPIC84125TPWPRQ1 is usually 5 days.
3.What payment methods are accepted for TPIC84125TPWPRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPIC84125TPWPRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPIC84125TPWPRQ1?
TPIC84125TPWPRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPIC84125TPWPRQ1 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 TPIC84125TPWPRQ1?
For technical support, including TPIC84125TPWPRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPIC84125TPWPRQ1 requirements.
6.How does Aetrix verify that TPIC84125TPWPRQ1 is sourced from the original manufacturer or authorized distributors?
All TPIC84125TPWPRQ1 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 TPIC84125TPWPRQ1 meets industry standards.
7.What is the process for return or replacement of TPIC84125TPWPRQ1?
All TPIC84125TPWPRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with TPIC84125TPWPRQ1, 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 TPIC84125TPWPRQ1 part is unused and in its original packaging.
Return procedure for TPIC84125TPWPRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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