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ST, Ams team up to deliver secure wearable reference design

Posted: 09 Mar 2016     Print Version  Bookmark and Share

Keywords:STMicroelectronics  ams  NFC controller  wearable  IoT 

At the same time, the close compatibility between the discrete ST and Ams components provides for sophisticated power-saving capabilities: the ST54E may be held in a deep power-down mode when not in the presence of an NFC RF field. At the same time, the AS39230 cycles rapidly through its far less power-hungry active power modes, drawing an average current of just 18μA.

The Ams/ST solution's software is optimised for low-power MCUs based on ARM technology. Its modular design means that users can choose to compile only the modules for the use cases their device supports, helping to reduce the system's memory requirement and to optimise the resource footprint.

Ams/ST wearable solution

Figure 1: Ams/ST wearable solution block diagram

The software stack optionally also supports peer-to-peer and reader/writer functionality, and can be updated over-the-air when the device is in the field.

The ST54E is supplied to developers fully approved for use as an NFC device in card emulation, peer-to-peer and tag reader modes in compliance with the NFC Forum standards. It is also suitable for use in applications, which require worldwide certification, including for Common Criteria, EMVCo, GlobalPlatform, and Visa, Mastercard, Amex, Discover and the People's Bank of China (PBoC).

In addition, the security capabilities of the mbed wearable reference design are enhanced by a separate fingerprint reader, which uses an STM32F411 Dynamic Efficient MCU from ST, based on the ARM Cortex-M4 core, to perform fingerprint image processing and matching.

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