STMicroelectronics ST25R3920 NFC reader IC for digital car keys

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Digital keys let drivers conveniently lock and unlock their cars using their smartphones, and support added-value features including easy sharing and management of access privileges for other users such as friends or valets. STMicroelectronics has now extended its portfolio of ST25R NFC reader ICs with an addition to its digital car key line, the ST25R3920.

The product introduces enhanced features for strong performance, including rapid key response and extended range. Together with dynamic power output (DPO) and noise-suppression receiver (NSR) technologies, the device is designed to increase RF output power and offers an enhanced input-circuit design for rapid car-key response and user convenience.

With DPO, the device operates at up to 1.6 W continuous RF output power and 2.5 W short-term input peak to maintain NFC connections over distance with a small antenna. ST’s NSR increases immunity to interference from noise sources and therefore simplifies electromagnetic immunity and eases certification.

Suitable for space-constrained locations that severely limit the maximum antenna size, the product can be positioned in door handles, a B-pillar or a centre console. Automatic antenna tuning compensates for changes in the RF environment to maintain a good connection to the user’s smartphone, and low-power key-signal detection with inductive wakeup minimises load on the battery when the key is not being used.

The ST25R3920 supports the CCC Digital Key Standardization Release 2.0, the architecture endorsed by leading carmakers, smartphone manufacturers and electronics suppliers. The chip is also certified by NFC Forum and can work as an NFC reader or NFC universal device. Compliance with NFC Forum standards for pairing applications, as well as EMVCo 3.0 standards, allows use as an in-car contactless-payment terminal for services such as electric-vehicle charging. In addition, a Qi wireless charging NFC-card protection algorithm enables safe wireless charging of portable devices.

For more information: www.st.com/st25r3920.