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STMicroelectronics’ ST1VAFE3BX Biosensing Chip: What Wearable Makers Need to Know

The ST1VAFE3BX combines biopotential signal sensing, motion data and embedded processing in a component intended for wearable-device makers—not consumers.

By WatchRanker Team 3 min read
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STMicroelectronics’ ST1VAFE3BX is a small sensor component designed to help wearable-device makers collect biopotential signals and motion data in one package. It is not a finished smartwatch, ring or medical device. ST announced it on October 28, 2024, and currently lists it as active and in volume production.

What is the ST1VAFE3BX?

The ST1VAFE3BX combines a vertical analog front end (vAFE) for biopotential signals with a three-axis accelerometer. ST positions it for developers building healthcare and fitness wearables, including watches, sports bands, connected rings, smart glasses and body-worn patches. The chip acquires sensor signals; it is not itself a diagnosis system or a product that determines a wearer’s mental or medical state. ST’s launch announcement and product page describe the component and its intended uses.

How does it combine biosensing and motion data?

The vAFE reads biopotential signals, while the accelerometer records movement. ST says the channels are synchronized, allowing motion data to add context when analyzing biosignals. That integration may be useful to developers designing wearable sensing systems, but it does not by itself establish how accurately a finished device measures a particular health signal.

An embedded finite state machine and machine-learning core can process sensor information on the device. ST presents these as ways to handle some functions without relying as heavily on a host microcontroller. The available product information describes signal acquisition and embedded processing, not clinical conclusions or independently validated health outcomes.

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ST1VAFE3BX specifications

The following figures are ST’s published specifications, not independent measurements. See ST’s product page for the current specification listing.

Specification ST-listed value
Biopotential-channel ADC 12-bit
Analog hub/vAFE output data rate Up to 3,200 Hz
Accelerometer output data rate 1.6–800 Hz
Accelerometer selectable ranges ±2g, ±4g, ±8g or ±16g
Package 12-lead LGA; maximum dimensions 2.0 × 2.0 × 0.74 mm
Typical current, high-performance mode 48.1 µA
Typical current, power-down 2.6 µA
Operating temperature range −40°C to +85°C

What wearable products is it intended for?

ST’s announcement points to smartwatches, sports bands, connected rings and smart glasses, as well as patches for lifestyle or medical monitoring. It also names BM Innovations GmbH and Pison as customers that had adopted the sensor for product development. Those statements indicate intended device categories and development activity; they do not confirm that a product using the chip has shipped or that its performance has been clinically validated. ST’s announcement is the source for those examples.

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Production status and price

ST announced the ST1VAFE3BX as in production on October 28, 2024. Its current product page lists the part as active and in volume production. ST’s launch notice gave a starting price of $1.50 for orders of 1,000 units in October 2024; that is dated launch pricing, not a current quote. ST’s online store listing shows current stock and quantity-based pricing, which can change.

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How developers can evaluate the chip

ST documents the STEVAL-MKI250KA demonstration kit as a companion for evaluating the ST1VAFE3BX. The kit includes a sensor board, electrode boards and a microcontroller that connects the sensor to a PC. Developers can use it with ST’s MEMS Studio graphical interface or custom software routines; ST lists ECG monitoring among the kit’s features. Check ST’s evaluation-kit page for current availability and details.

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For a developer assessing whether the chip fits a design, the practical checks are:

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  • Confirm that the biopotential input and synchronized motion data suit the signals and movement conditions the intended device must handle.
  • Review the published data rates, selectable acceleration ranges, package dimensions and current figures against the device’s power and board constraints.
  • Use the evaluation kit to explore the sensor, electrodes and software workflow before committing to a product design.
  • Assess any finished wearable’s measurement accuracy and health claims separately; component capabilities alone do not validate the final device.

Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.

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