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Customisable wireless medical sensor chip with ML accelerator

Customisable wireless medical sensor chip with ML accelerator

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By Ally Winning



Because of the integration of a large amount of functions onto a single chip, eSi-MediSense brings costs down. The chip could allow a health monitoring watch to cost around £100.

The single-chip has been designed to be an ultra-low-power platform that can work with multiple processor and DSP configurations. It has an optional machine learning accelerator that allows artificial intelligence to be designed into medical sensors. The AI accelerator both reduces the frequency of wireless communication and extends the battery life.

The platform can accurately and reliably measure ECG, heart rate, respiration rate, pulse oximetry and temperature. The device also features a flexible interface for electro chemical-based measurement such as amperometric, voltammetric or impedance measurements.

After processing, data is encrypted and transmitted using either the 2.4 GHz ISM band radio (Wi-Fi / Bluetooth / proprietary and medical), a sub-1 GHz MBAN standard or an ultra low power standard such as BLE 5.0 or 802.15.4. An NFC-A tag can be integrated to simplify device pairing and allow medical sensor data to be read by a smartphone.

“The platform has been developed to work with a huge range of sensors: from ECG to temperature and from electro-chemical to bioimpedance. Plus, our design team have the expertise to develop and integrate additional custom sensor interfaces with demanding performance requirements. It is an ideal platform to integrate custom sensors or run your smart diagnostic and remote healthcare applications on a single chip.”

The eSi-MediSense conforms to: IEC 60601-1, IEC 60601-2-27 and IEC60601-2-49. Its specialised medical analog front end can work with single lead and multi-lead ECG with clinical grade accuracy to provide R-R heart rate monitoring; temperature sensor interfaces to ISO 80601-2-56; bioimpedance channel capable of measuring respiration; and multi-channel electrochemical impedance spectroscopy (EIS).

It supports supply voltages between 1.0 and 3.6 V and has multiple power states are able to deliver a standby current of <1 µA.

The data is encrypted on the chip using crypto accelerators: AES-256, SHA-512 and ECC-384 with a true-random number generator (NIST 800-22). The platform can use a range of RTOS, including FreeRTOS, SafeRTOS, ThreadX and eBed OS, and comes with a feature rich DSP software library for easy algorithm programming.

More information

https://www.ensilica.com/market-sectors/medical-asic/

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