Rohm Uses ST NFC Chips For Qi Automotive Wireless Charging Design

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ROHM’s Qi automotive wireless charging solution, which includes STMicroelectronics’ NFC Reader IC and 8-bit microcontroller, enables innovative products in automotive applications. 

STMicroelectronics announced that its automotive NFC Reader IC (ST25R3914) and its automotive 8-bit microcontroller (STM8AF) have been chosen for the Qi-compliant automotive wireless charging reference design from Rohm. The design is based on the BD57121MUF-M 15W Qi-compliant 15W wireless charging IC developed by Rohm that aims to increase the adoption of wireless charging solutions in the center console of the vehicle.

ST notes that one of the benefits of the company’s contribution to the design is to enable the sophisticated control that makes possible the detection of contactless smart cards in proximity to the charging system in order to halt the charging immediately. This important and appreciated function prevents the failure of those cards due to the strong magnetic field generated by the Qi transmitter.

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“Contactless communication based on NFC is already in extensive use for functions such as mobile payment by smartphone and in recent years, NFC use has been rapidly widening from mobile devices to industrial equipment, IoT devices, and even automotive systems”, the announcement stated.

The automotive NFC reader IC

As explained by ST, the automotive NFC Reader IC ST25R3914 is an AEC-Q100 grade 1 qualified NFC analog front-end device supporting ISO14443A/B, ISO15693, FeliCa, and active P2P. It features a best-in-class RF performance and its unique Automatic Antenna Tuning function dynamically adapt to challenging metallic environments, making it the perfect fit for automotive applications. It comes with a MISRA-C: 2012-compliant RF middleware which helps to shorten the time required for software development.

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The automotive 8-bit MCU

The automotive 8-bit MCU from ST, STM8AF, provides high performance, a wide-ranging choice for memory size, and many package options, contributing to more flexible automotive systems. The MCU features true data EEPROM, CAN and LIN bus, and high operating temperature support up to 150°C. In combination with the NFC function, it can also be used as a controller to manage new types of automotive NFC applications, such as Bluetooth/Wi-Fi pairings for smartphones, “infotainment” using NFC verification, and engine start-up.

“Rohm’s adoption of the ST NFC products and 8-bit microcontroller for their Qi-standard automotive wireless-charging reference design shows that ST’s broad product lineup has big potential for creating new and valuable automotive functions,” said Hiroshi Noguchi, Japan country manager, STMicroelectronics.

“We anticipate many auto manufacturers will see wireless charging as an important added value that will provide ST with another way to contribute to a more comfortable driving experience for consumers.”

ST and Rohm demonstrated this Qi-standard automotive wireless charging reference design at the Automotive World 2019.

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