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ST25R3920B NFC to Simplified Digital Vehicle Key System Authentication

Oct 14 2022

Wireless sensing technology has penetrated into people's daily life, such as NFC convenient payment, identity recognition, contactless RF smart card, security fire protection system, vehicle monitoring, industrial data acquisition system, wireless remote control system, robot control, etc.

Among them, NFC plays an important role in various fields, and more and more manufacturers are involved in the production of NFC chips, including NXP, STMicroelectronics, Infineon, Renesas, etc.

STMicroelectronics First CCC Automotive-grade NFC Chip

The ST25R3920B launched by STMicroelectronics is the first CCC automotive-grade chip certified by the NFC Forum.

It is an automotive-grade NFC reader IC with improved Active Waveform (AWS) functionality that facilitates CCC automotive digital key solutions and smartphone interaction while simplifying product authentication. AWS helps the reader eliminate undershoot and overshoot voltages in the received signal by adjusting parameters, thereby avoiding repeated rematching of the antenna during development. It supports automatic antenna tuning and automatic low-power wake-up functions.

Source: STMicroelectronics

In addition, ST25R3920B is also equipped with STMicroelectronics' unique Heartbeat protection algorithm, which can protect NFC cards in Wireless Power Consortium (WPC) applications, distinguish between NFC cards and mobile phone card emulation modes, and ensure that the phone is charged while protecting the card.

The ST25R3920B is installed in the door and center console locations for keyless entry and engine start, as well as Qi wireless charging control and smartphone pairing.

With up to 1.6W output power and best-in-class receiving sensitivity. The high noise immunity input structure is integrated with ST's unique Noise Suppression Receiver (NSR), so it has the highest immunity to external interference on the market.

Differences between NFC and RFID

NFC is near-field communication technology, which is a non-contact high-frequency identification interconnection technology that allows electronic devices to perform short-range wireless communication. So what is the difference between it and RFID?

NFC can be said to be a technology that integrates the functions of RFID card readers and RFID cards and provides compatibility with RFID devices. The IC access control cards and bus cards that we use every day are all products of RFID technology.

Both use electromagnetic induction coupling for data transmission, but NFC uses a unique signal attenuation technology, which has a shorter transmission distance, higher data bandwidth, and lower energy consumption than RFID technology.


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