STMicroelectronics STSAFE secure elements for wireless charging

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Wireless chargers must be properly designed to protect consumers’ products, particularly in high-power, fast-charging modes. The Qi logo is awarded after testing and certifying in accordance with the WPC-Qi specifications. STMicroelectronics is protecting wireless charging of small devices and mobiles with its STSAFE secure elements for authenticating certified Qi chargers.

The company provides a secure way to authenticate genuine Qi-certified chargers before increasing the charge at any power level over 5 W. The secure elements are loaded with official Qi Certificates and provide authentication that leverages state-of-the-art cryptography. The elements clearly identify the charger and strictly attest to its authenticity as a Qi-certified product.

The STSAFE-A110 and STSAFE-V110 for automotive applications are loaded at a secure ST factory, creating a ready-to-use solution that relieves the charger makers from the burden of loading the sensitive data securely. For consumer markets, STSAFE-A110 is available in 4 x 5 mm SO8N or 2 x 3 mm UFDFPN8 packages. For the automotive market, STSAFE-V110 is available in a TSSOP20 package.

The STSAFE IC family provides common functions and services for end-to-end security optimised for consumables, connected devices and automotive peripherals. It relies on state-of-the-art security audited by independent security authorities and it is certified Common Criteria EAL5+ AVA_VAN 5.

STSAFE-A110 and STSAFE-V110 consist of a secure operating system executed on a secure microcontroller. They offer authentication based on ECDSA asymmetric cryptography and X509 certificates containing a unique serial number. For Qi authentication, they are preloaded with the appropriate cryptographic key and the official Qi Certificate corresponding to the customer’s Qi charger. The STSAFE-V110 is certified according to automotive standard AEC-Q100 grade 2.

Users can also take advantage of a comprehensive STSAFE-A110 ecosystem to support product development and ease integration of the element with the application host system, including ST’s STM32 microcontroller family, and devices such as ST’s STWBC2 digital controller for wireless battery charger transmitters.