NFC car door handle solution for keyless entry based on NXP S32K118-EEWORLD

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Cars are the most widely used means of transportation, and most of them are mechanical and manual switches that control car door handles. From the birth of the car to the present, car keys have gone through many stages of development: from physical keys to remote control keys that remotely open and close car doors, to smart keys for keyless start, mobile phone cloud keys, mobile phone Bluetooth keys, and subsequently derived unlocking keys. The methods also vary - cards, passwords, fingerprints, mobile phones. All in all, the "car key" has evolved from a physical object to a concept. The focus of this article's solution is NFC . If NFC technology is applied to electric car door handles, electric car door handles can be controlled through near-field communication devices (such as mobile phones). This is more efficient than mechanical and manual control of car door handles. Smart, more practical and convenient. NFC is a good application prospect combined with the automotive market. NFC can very securely ensure that car doors are opened and closed correctly through encrypted protocol communication and close contact.

Regarding the application of NFC car keys, the earliest model was the Tesla Model 3. After that, NIO, a new domestic car-making force, also implemented the NFC unlocking function, but it was a card similar to a bus card as a carrier. Later, BYD took the lead in The mobile phone NFC car key function is launched in the domestic market. It is first adapted to the models: BYD Qin Pro transcendent version and Song Pro. It uses the mobile phone as the carrier. When using it, you only need to bring the mobile phone close to the part where the signal receiver is located to unlock the vehicle, just like using a mobile phone. It's the same as swiping the turnstile to enter a subway station.

For NFC car key applications, Dalian Shiping Group has launched a car door handle solution based on NXP car-standard MCU chip S32K 118/116 and car-standard NFC controller chip NCF3320. The main form of this solution is a long strip, which is mainly used on car door handles or rearview mirrors. Its main function is to unlock car doors through digital keys, thus replacing traditional keys, making it safer and more convenient. The chip data, software code, NFC library, and hardware data involved in this solution can only be obtained after signing an NDA agreement.

►Scenario application diagram

►Display board photo

►Solution block diagram

►Core technology advantages

Advantages of the key device NXP S32K 118:

1. Automotive-grade high performance: Cortex™-M0+ core, 48MHz main frequency

2. Rich peripheral resources:

· 256KB Flash, 2KB EEPROM

· 12-bit 1 Msps ADC, 16-bit FlexTimers

· Up to 58 I/Os available · Support CAN FD, FlexIO (UART, I2C, SPI, I2S, LIN, PWM)

· Scalable low-power run and stop modes. Fast wake-up, clock and power gating

3. Strong compatibility: 48 Pin LQFP package, all 48 Pin P2P compatible

4. Ease of use: MCU-based developers are easy to use, improving performance while leveraging the tool chain. Advantages of the key device NXP NCF3320:

1. NFC full protocol support:

· Supports ISO/IEC 14443 A/MIFARE, ISO/IEC 14443 B and FeliCa

· P2P passive enabler mode compliant with ISO/IEC 18092

· Support ISO/IEC15693, ICODE EPC UID and ISO/IEC 18000-3 Mode 3/EPC Class-1 HF

2. Flexible and efficient power-saving modes: hard power off, standby and low-power card check, with an average power consumption of at least 15uA

3. Rich host interface:

· SPI: up to 10 Mbit/s

· I2C: Bus interface up to 400 kBd in fast mode and up to 1000 kBd in fast mode+

· RS-232: Serial UART up to 1228.8 kBd, voltage level depends on power pin

►Project specifications

1. Processor: ARM®Cortex-M0+

2. Memory: on-chip 256K Flash, 2K EEPROM