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NXP Semiconductors PCF7952ATT/C2BC20J
- Part No.:
- PCF7952ATT/C2BC20J
- Manufacturer:
- NXP Semiconductors
- Category:
- RFID, RF Access, Monitoring ICs
- Package:
- -
- Datasheet:
-
PCF7952ATT/C2BC20J.pdf
- Description:
- IC PASS ENTRY 125KHZ
- Quantity:
- Payment:
- Shipping:
Inventory:3,818
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Product details
Overview
PCF7952ATT/C2BC20J from NXP Semiconductors is a dedicated keyless entry/go IC with integrated 125 kHz 3D low-frequency frontend, ultra-low-power 8-bit microcontroller architecture, and hardware immobilizer security algorithm. It enables precise inside/outside detection for automotive door unlock and push-to-start functions, supporting RSSI-based key localization and passive LF backup mode.
For engineers reviewing the PCF7952ATT/C2BC20J datasheet, PCF7952ATT/C2BC20J pinout, PCF7952ATT/C2BC20J application, or PCF7952ATT/C2BC20J equivalent, this device requires attention to LF sensitivity (≥–105 dBm), wake-up latency (<100 µs), EEPROM endurance (100k cycles), UHF transmission capability (315/433/868 MHz), and TSSOP38 package thermal profile in vehicle access system design.
Technical Context
The PCF7952ATT/C2BC20J implements a field-proven 8-bit RISC microcontroller core with dedicated hardware acceleration for immobilizer cryptographic operations and RSSI-based distance estimation. Its 3D LF frontend supports simultaneous reception on three orthogonal axes for robust spatial detection without external signal conditioning.
It integrates a programmable wake-up processor that monitors LF carrier presence and triggers full MCU activation only upon valid challenge signal detection, enabling sub-1 µA standby current. The device operates across –40°C to +105°C and supports dual power domains (CVDDC/VBATA) for battery-backed operation during immobilizer backup mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| LF Frequency | 125 kHz - Enables standardized low-frequency challenge communication with vehicle basestation per ISO 14443-A and SAE J2931. |
| LF Sensitivity | ≤ –105 dBm - Supports reliable key wake-up at >2 m distance with standard coil geometry and minimal PCB layout constraints. |
| Standby Current | <1 µA - Extends CR2032 battery life beyond 5 years in typical key fob usage profiles. |
| EEPROM Size | 2 Kbyte - Stores cryptographic keys, rolling code counters, and configuration data with 100k write/erase cycle endurance. |
| UHF Output | 315/433/868 MHz - Provides region-specific response transmission compatible with common automotive receiver frontends. |
| Operating Temp | –40°C to +105°C - Qualified for under-hood and exterior key fob deployment without derating. |
| Security Core | Hardware immobilizer algorithm - Performs AES-128 and proprietary crypto operations without software intervention or RAM exposure. |
Pinout & Package
TSSOP38 package (9.7 mm × 4.4 mm × 1.1 mm, 0.65 mm pitch) with exposed thermal pad for enhanced thermal dissipation in sealed key fob enclosures.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN1P/IN1N, IN2P/IN2N, IN3P/IN3N | 3D LF differential inputs | Accept orthogonal 125 kHz magnetic field components; enable spatial detection without mechanical alignment. |
| P10–P13, P20–P24, P30–P34 | General-purpose I/O | Support up to 8 wake-up button inputs, LED drive, buzzer control, and SPI interface for external transceivers. |
| VBAT, VBATA, CVDDC | Power supply rails | Separate battery input (VBAT), analog supply (VBATA), and digital core supply (CVDDC) for noise isolation and backup mode operation. |
| VSS, VSSA | Ground terminals | Digital and analog ground separation minimizes coupling between LF frontend and digital switching noise. |
| P15 (XCLK) | External crystal input | Accepts 32.768 kHz crystal for real-time clock and low-power timing; enables accurate rolling code generation. |
Key Features
| Feature | Design Value |
|---|---|
| 3D LF frontend | Enables orientation-independent key detection without user repositioning or antenna calibration. |
| Hardware immobilizer crypto unit | Executes secure authentication without exposing keys in RAM or firmware, meeting OEM anti-cloning requirements. |
| RSSI-based distance estimation | Provides coarse proximity feedback (inside/outside car) using received LF signal amplitude, eliminating need for separate UWB or BLE subsystems. |
| Passive LF backup mode | Allows key operation with depleted battery by harvesting energy from vehicle's LF field, ensuring fail-safe entry. |
| Ultra-low-power wake-up processor | Reduces average current to <1 µA by ignoring ambient LF noise and activating only on valid challenge preamble. |
Applications
| Automotive Key Fob | Smart Entry Transponder |
|---|---|
Use Scenario: Driver approaches vehicle and touches door handle to trigger unlock sequence. IC Role / Device Role / Timing Role: PCF7952ATT/C2BC20J acts as the primary LF receiver and UHF transmitter, performing challenge-response authentication and RSSI-based proximity classification. Use Value: Eliminates mechanical key insertion while maintaining <2 m detection range and <500 ms total unlock latency. | Use Scenario: Integrated into OEM-issued key blade with embedded transponder coil and button array. IC Role / Device Role / Timing Role: PCF7952ATT/C2BC20J serves as the secure key identity engine, managing rolling codes, cryptographic state, and dual-mode (LF/UHF) communication. Use Value: Reduces bill-of-materials by integrating microcontroller, LF frontend, crypto accelerator, and power management in single TSSOP38 package. |
| Push-to-Start Engine Control | Immobilizer Backup System |
Use Scenario: Driver presses start button after entering cabin; system verifies key presence before cranking. IC Role / Device Role / Timing Role: PCF7952ATT/C2BC20J performs second-stage authentication using same LF/UHF protocol, confirming key is inside vehicle via RSSI threshold comparison. Use Value: Prevents unauthorized engine start when key is outside vehicle (e.g., on roof or in adjacent car) with <10 cm proximity resolution. | Use Scenario: Vehicle detects low battery in key fob and initiates passive LF energy transfer to power PCF7952ATT/C2BC20J. IC Role / Device Role / Timing Role: PCF7952ATT/C2BC20J switches to passive LF mode, rectifying incoming 125 kHz field to power internal logic and transmit fixed immobilizer response. Use Value: Ensures continued vehicle access even with fully discharged CR2032 battery, complying with OEM fail-safe requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar keyless entry/go applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| PCF7953ATT/C2BC20J | Same architecture but includes integrated UHF transmitter; PCF7952 requires external UHF IC. | Reduces external component count in compact key fobs where UHF integration is preferred over flexibility. | Select PCF7953ATT/C2BC20J when board space is constrained and UHF frequency is fixed (e.g., 433 MHz only). |
| NCF2952TAA,118 | ACTIC-4G generation with 16-bit core, higher LF sensitivity (–108 dBm), and AES-128 crypto support. | Required for new designs targeting enhanced security compliance (e.g., ISO/SAE 21434) and extended detection range (>2.5 m). | Select NCF2952TAA,118 for next-generation platforms needing future-proof crypto and improved RF performance. |
Compared with PCF7952ATT/C2BC20J, PCF7953ATT/C2BC20J reduces BOM count via integrated UHF, while NCF2952TAA,118 delivers higher security assurance and longer-range detection-making it suitable for Tier-1 programs requiring ISO 21434 alignment and extended lifecycle support.
Availability
PCF7952ATT/C2BC20J is available at Aetrix Electronics and suitable for automotive key fob manufacturing, smart entry transponder integration, and push-to-start engine control systems requiring stable component supply and long-term automotive qualification.
Supply support for PCF7952ATT/C2BC20J 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
NXP Semiconductors is a global semiconductor leader specializing in secure connectivity solutions for automotive, industrial, and IoT applications, with deep expertise in car access and immobilizer systems.
The PCF7952ATT/C2BC20J belongs to NXP's ACTIC-Pro keyless entry/go product line, designed specifically for cost-sensitive, high-volume automotive key fobs requiring ultra-low power consumption and proven LF/UHF authentication reliability.
FAQ
What is the primary function of the PCF7952ATT/C2BC20J in automotive keyless systems?
The PCF7952ATT/C2BC20J serves as the core keyless entry/go IC in automotive key fobs, handling 125 kHz LF challenge reception, RSSI-based proximity detection, cryptographic authentication, and UHF response transmission. It integrates an 8-bit microcontroller, 3D LF frontend, hardware immobilizer engine, and power management to enable seamless unlock and push-to-start functionality without external processors.
Does the PCF7952ATT/C2BC20J include an integrated UHF transmitter?
No, the PCF7952ATT/C2BC20J does not integrate a UHF transmitter. It requires an external UHF transceiver (e.g., PCF790 or PQJ7980) for response transmission. This architecture provides frequency flexibility and allows independent optimization of LF and UHF sections. The PCF7953ATT/C2BC20J variant includes an integrated UHF transmitter.
What package type is used for the PCF7952ATT/C2BC20J?
The PCF7952ATT/C2BC20J is housed in a TSSOP38 package measuring 9.7 mm × 4.4 mm × 1.1 mm with 0.65 mm lead pitch and an exposed thermal pad. This package supports automated assembly, meets automotive AEC-Q100 Grade 2 requirements, and provides sufficient thermal dissipation for continuous LF frontend operation in sealed key fob enclosures.
How does the PCF7952ATT/C2BC20J support battery longevity in key fobs?
The PCF7952ATT/C2BC20J achieves ultra-low standby current (<1 µA) through its dedicated wake-up processor, which remains active while the main MCU sleeps. It activates only upon detection of a valid LF challenge preamble, minimizing unnecessary power draw. Combined with 2 Kbyte EEPROM optimized for low-voltage writes, this enables CR2032 battery life exceeding five years in typical usage.
What security features are implemented in the PCF7952ATT/C2BC20J?
The PCF7952ATT/C2BC20J includes a hardware-based immobilizer security algorithm supporting proprietary and standardized protocols, with cryptographic operations executed entirely in dedicated logic-no keys stored in RAM or software-accessible memory. It also supports Receive Signal Strength Indication (RSSI) for spatial authentication and passive LF backup mode to prevent denial-of-service attacks from battery depletion.
PCF7952ATT/C2BC20J Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Passive Entry/Start
- Frequency:
- 125kHz
- Standards:
- -
- Interface:
- -
- Voltage - Supply:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
PCF7952ATT/C2BC20J FAQ
1.How can I place an order for PCF7952ATT/C2BC20J through Aetrix?
Please submit a Request for Quotation (RFQ) for PCF7952ATT/C2BC20J 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 PCF7952ATT/C2BC20J reliable?
The price and inventory of PCF7952ATT/C2BC20J are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PCF7952ATT/C2BC20J is usually 5 days.
3.What payment methods are accepted for PCF7952ATT/C2BC20J?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PCF7952ATT/C2BC20J transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PCF7952ATT/C2BC20J?
PCF7952ATT/C2BC20J orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PCF7952ATT/C2BC20J 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 PCF7952ATT/C2BC20J?
For technical support, including PCF7952ATT/C2BC20J datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PCF7952ATT/C2BC20J requirements.
6.How does Aetrix verify that PCF7952ATT/C2BC20J is sourced from the original manufacturer or authorized distributors?
All PCF7952ATT/C2BC20J 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 PCF7952ATT/C2BC20J meets industry standards.
7.What is the process for return or replacement of PCF7952ATT/C2BC20J?
All PCF7952ATT/C2BC20J units undergo pre-shipment inspection (PSI). If there is an issue with PCF7952ATT/C2BC20J, 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 PCF7952ATT/C2BC20J part is unused and in its original packaging.
Return procedure for PCF7952ATT/C2BC20J:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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