STMicroelectronics — ST1VAFE3BX Biosensor with vAFE

STMicroelectronics ST1VAFE3BX Biosensor with vAFE

Featuring a high-performance 3-axis digital accelerometer for precise motion tracking

STMicroelectronics ST1VAFE3BX has been engineered with a compact, low-noise, and low-power virtual analog front end (vAFE) featuring configurable input impedance. This vAFE is designed to capture analog signals that complement motion data, and because both the vAFE and motion signals are intrinsically synchronized, the device achieves highly efficient, context-aware edge analysis with minimal latency and reduced power consumption.

The tight integration and synchronization between the vAFE and the accelerometer signal enable standalone processing within the MEMS sensor itself. By leveraging the embedded ecosystem—including the finite state machine (FSM) and machine learning core (MLC)—the ST1VAFE3BX can offload tasks from the host microcontroller for improved efficiency.

To further support advanced applications, the device incorporates specialized signal-processing features such as the FSM, adaptive self-configuration (ASC), and exportable AI-based filters within the MLC.

A MIPI I3C® target interface and an embedded 128-level FIFO buffer enhance system integration, delivering advantages in bill-of-materials optimization, processing, and power efficiency.

The integrated accelerometer supports user-selectable full-scale ranges of ±2g, ±4g, ±8g, and ±16g, with output data rates from 1.6 Hz to 800 Hz. An internal engine handles motion and acceleration detection tasks, including free-fall, wake-up, tap recognition (single/double/triple), activity/inactivity monitoring, and 4D/6D orientation detection.

Finally, the ST1VAFE3BX is offered in a compact, thin land grid array (LGA) package and is specified to operate reliably across an extended temperature range from -40°C to +85°C.

Features

Applications

• Biopotential signal detection (ENG, ECG, EEG)
• Wearable and portable devices
• Activity tracking and well-being