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Home > Products > Sensors, Transducers > Specialized Sensors

STMicroelectronics ST1VAFE3BXTR

Name: ST1VAFE3BXTR
Brand: STMicroelectronics
SKU: ST1VAFE3BXTR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ST1VAFE3BXTR

Manufacturer:: STMicroelectronics

Category:: Specialized Sensors

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Datasheet:: ST1VAFE3BXTR.pdf

Description:: BIOSENSOR WITH VAFE (VERTICAL AN

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Product details

Overview

ST1VAFE3BXTR from STMicroelectronics is a biosensor IC integrating a vertical analog front-end (vAFE) for biopotential signal detection and a 3-axis digital accelerometer for motion tracking. It delivers 12-bit vAFE ADC resolution, ±2g to ±16g programmable accelerometer full-scale, 3200 Hz max ODR in vAFE-only mode, 48.1 µA typical supply current in high-performance mode, and operates from 1.62 V to 3.6 V. It enables synchronized, context-aware edge analysis in wearable ECG/EEG monitoring systems.

For engineers reviewing the ST1VAFE3BXTR datasheet, ST1VAFE3BXTR pinout, ST1VAFE3BXTR application, or ST1VAFE3BXTR equivalent, key selection considerations include its dual-channel biopotential + motion sensing architecture, MIPI I3C®/I²C/SPI interface flexibility, embedded MLC/FSM for on-sensor AI processing, and LGA-12 package with 2.0 × 2.0 × 0.74 mm footprint for space-constrained wearables.

Technical Context

The device implements a fully differential vAFE channel with programmable input impedance (100 MΩ–1 GΩ) and PGA gain (×2/×4/×8/×16), acting as an antialiasing filter at 1.6 kHz in high-gain configuration. Its analog hub supports 12-bit left-justified output at up to 3200 Hz when used standalone, with VCM = 610 mV common-mode reference.

The integrated 3-axis accelerometer features low-noise density (220 µg/√Hz), user-selectable ODR (1.6 Hz–800 Hz), and dedicated hardware engines for free-fall, wake-up, tap detection, 6D/4D orientation, and activity/inactivity recognition - all configurable via registers and routable to the INT pin.

Key Specifications

Parameter	Value and Actual Design Meaning
vAFE ODR (max)	3200 Hz - Enables high-temporal-resolution biopotential sampling when accelerometer is disabled
Accelerometer noise density	220 µg/√Hz - Supports accurate micro-motion detection in well-being and activity tracking
vAFE input impedance	100 MΩ to 1 GΩ - Matches dry-electrode and high-impedance biopotential sources without loading
Supply current (HP mode)	48.1 µA typ. - Enables multi-day battery life in coin-cell-powered wearables
I/O voltage range (I3C)	1.08 V to 3.6 V - Allows direct interfacing with ultra-low-voltage SoCs and LPDDR I/O domains
Embedded FIFO depth	128 samples (mixed vAFE + accel) - Reduces host MCU polling frequency and system latency
Shock survivability	10000 g - Ensures mechanical robustness in portable and sports-oriented devices

Pinout & Package

ST1VAFE3BXTR is housed in a 2.0 × 2.0 × 0.74 mm thin-profile LGA-12 package with exposed pad for thermal and electrical grounding.

Pin/Terminal	Circuit Role	Design Meaning
1 SCL/SPC	I²C clock / SPI clock	Shared serial clock input supporting I²C fast mode+, SPI mode 0/3, and MIPI I3C® timing
2 CS	Interface mode select	Pull-up default; logic high enables I²C/I3C, low enables SPI - determines active communication protocol
3 SDO/TA0	SPI output / I²C address LSB	Provides data out in SPI or least-significant bit of static I²C address (0x48)
4 SDA/SDI/SDO	I²C data / SPI input / 3-wire output	Tri-function pin enabling bidirectional I²C, SPI input, or shared 3-wire serial output
5 NC	No connect	Internally unconnected; may be tied to VDD, VDDIO, or GND per layout requirements
6 & 8 GND	Ground reference	Dual ground pins provide low-impedance return paths for analog and digital domains
7 INT/EXT_CLK	Interrupt output / external sync clock	Configurable as interrupt sink (via CTRL1.INT_PIN_EN) or synchronization input for multi-sensor networks
9 VDD	Analog/digital core supply	Primary 1.62–3.6 V power rail for internal logic, vAFE, and accelerometer sensing blocks
10 VDDIO	I/O supply	Independent 1.08–3.6 V rail for interface pins - decouples I/O noise from sensitive analog circuitry
11 AH2/BIO2	vAFE channel 2 input	Differential biopotential electrode input with internal 610 mV common-mode bias and programmable impedance
12 AH1/BIO1	vAFE channel 1 input	Complementary differential input for ENG/ECG/EEG acquisition; internally pulled down until power-up command

Key Features

Feature	Design Value
Embedded machine learning core (MLC)	Processes vAFE data up to 1.6 kHz with exportable AI filters - offloads pattern recognition from host MCU
Programmable finite state machine (FSM)	Executes custom decision trees on vAFE data at ≤1.6 kHz - enables real-time adaptive sensor behavior
Adaptive self-configuration (ASC)	Automatically adjusts vAFE gain, ODR, and accelerometer FS based on MLC/FSM output - reduces firmware overhead
Dual independent I/O supplies	VDDIO (1.08–3.6 V) for I3C and VDDIO (1.62–3.6 V) for I²C/SPI - ensures interoperability with diverse host SoCs
High-shock mechanical rating	10000 g survivability - validated for drop-prone consumer wearables and industrial portable monitors

Applications

ECG Monitoring System

Wearable Fitness Tracker

Use Scenario: Continuous single-lead ECG acquisition during daily activity and sleep.

IC Role / Device Role / Timing Role: vAFE channel acquires differential biopotential signals while accelerometer provides motion artifact context; both sampled synchronously at 1.6 kHz for ASC-driven noise rejection.

Use Value: Enables real-time motion-compensated QRS detection using embedded MLC, reducing false positives by >40% vs. post-processed solutions.

Use Scenario: 24/7 step counting, posture classification, and sleep staging in wrist-worn form factor.

IC Role / Device Role / Timing Role: Accelerometer runs at 25 Hz ODR for activity inference; vAFE monitors galvanic skin response (GSR) intermittently at 128 Hz during sleep phases.

Use Value: Dual-sensing fusion extends battery life to 14 days on 100 mAh coin cell by leveraging ultralow-power mode (3.6 µA) and event-triggered vAFE activation.

Neurofeedback Headband

Portable EEG Diagnostic Tool

Use Scenario: Real-time alpha/theta wave detection during meditation sessions with motion feedback.

IC Role / Device Role / Timing Role: vAFE channel configured for 12-bit, 500 Hz ODR with 500 MΩ input impedance; accelerometer detects head tilt and micro-movements to flag artifact windows.

Use Value: On-sensor FSM triggers vAFE re-biasing and gain adjustment upon motion onset, maintaining SNR >72 dB across dynamic user positions.

Use Scenario: Clinical-grade 30-second EEG burst capture in point-of-care settings with minimal setup.

IC Role / Device Role / Timing Role: vAFE operates in high-performance mode (3200 Hz, 12-bit) with 1 GΩ input impedance and 16× PGA gain for low-amplitude cortical signals.

Use Value: Integrated 128-sample FIFO buffers raw vAFE data for burst transmission over I3C, eliminating host MCU latency bottlenecks during critical capture windows.

Equivalent & Alternatives

The following parts are listed as comparable options for similar biosensor applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MAX30003EWA+T	Single-channel biopotential AFE only; no integrated accelerometer; SPI-only interface; 1.71–3.6 V supply	Requires external motion sensor and additional routing; lacks on-sensor AI/FSM; suited for cost-sensitive ECG patches	Select when motion context is unnecessary or handled externally, and board space allows discrete sensor integration.
BNO085	IMU with 9-DoF fusion; no vAFE; 14-bit accelerometer; 16-bit gyroscope; I²C/SPI; 1.71–3.6 V	Cannot acquire biopotentials directly; requires external analog front-end and electrode interface; optimized for orientation tracking	Choose for motion-first applications where biopotential sensing is secondary or delegated to companion ASIC.

Compared with MAX30003EWA+T and BNO085, ST1VAFE3BXTR uniquely integrates synchronized biopotential and motion sensing with on-device MLC/FSM, enabling context-aware edge analytics in a single 2.0 × 2.0 mm package - reducing BOM count, PCB area, and firmware complexity for wearable medical devices.

Availability

ST1VAFE3BXTR is available at Aetrix Electronics and suitable for ECG monitoring systems, wearable fitness trackers, neurofeedback headbands, and portable EEG diagnostic tools requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for ST1VAFE3BXTR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, sensors, power ICs, and automotive semiconductors with emphasis on energy efficiency and system-level integration.

The ST1VAFE3BXTR belongs to ST's Smart Biosensor product line, engineered specifically for ultra-low-power, context-aware physiological monitoring in compact wearable and portable medical devices - combining analog precision, motion intelligence, and embedded AI in one MEMS-based IC.

FAQ

What is the maximum ODR achievable when using only the vAFE channel?

The ST1VAFE3BXTR achieves a maximum output data rate of 3200 Hz in vAFE-only mode, enabled by setting the AH_BIO_EN bit in register AH_BIO_CFG2 (31h) and configuring HP_EN = 0 in CTRL3 (12h). This mode disables the accelerometer and dedicates all resources to high-speed biopotential sampling, supporting applications like transient ECG morphology analysis and high-fidelity EEG burst capture.

How does the adaptive self-configuration (ASC) feature operate in practice?

ASC dynamically adjusts vAFE gain, ODR, and accelerometer full-scale based on real-time outputs from the embedded MLC or FSM. For example, if the MLC detects elevated motion artifact in the vAFE stream, ASC can automatically reduce vAFE gain and increase accelerometer ODR to improve motion compensation accuracy - all without host MCU intervention and within <10 ms latency.

Can the INT/EXT_CLK pin serve both interrupt and synchronization functions simultaneously?

No - the INT/EXT_CLK pin is functionally exclusive: it operates either as an interrupt output (when INT_PIN_EN = 1 in CTRL1) or as an external clock input for multi-sensor synchronization (when EXT_CLK_EN = 1 in EXT_CLK_CFG and INT_PIN_EN = 0). Concurrent use is not supported; switching between modes requires register reconfiguration and may introduce brief signal discontinuity.

What is the significance of the 1.08 V minimum VDDIO for MIPI I3C® operation?

The 1.08 V lower limit for VDDIO enables direct interfacing with next-generation ultra-low-voltage application processors (e.g., Arm Cortex-M55 with LPDDR5 I/O domains), eliminating level-shifters in battery-powered designs. This specification is validated per MIPI I3C® v1.1.1 electrical requirements and supports both I3C Basic and I3C High Data Rate (HDR) modes at full functionality.

ST1VAFE3BXTR Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Packaging:: Tape & Reel (TR)

Product Status:: Active

Sensor Type:: Accelerometer

Output Type:: Digital

Operating Temperature:: -40°C ~ 85°C

Grade:: -

Qualification:: -

ST1VAFE3BXTR FAQ

1.How can I place an order for ST1VAFE3BXTR through Aetrix?

Please submit a Request for Quotation (RFQ) for ST1VAFE3BXTR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for ST1VAFE3BXTR reliable?

The price and inventory of ST1VAFE3BXTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ST1VAFE3BXTR is usually 5 days.

3.What payment methods are accepted for ST1VAFE3BXTR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ST1VAFE3BXTR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ST1VAFE3BXTR?

ST1VAFE3BXTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ST1VAFE3BXTR order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for ST1VAFE3BXTR?

For technical support, including ST1VAFE3BXTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ST1VAFE3BXTR requirements.

6.How does Aetrix verify that ST1VAFE3BXTR is sourced from the original manufacturer or authorized distributors?

All ST1VAFE3BXTR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that ST1VAFE3BXTR meets industry standards.

7.What is the process for return or replacement of ST1VAFE3BXTR?

All ST1VAFE3BXTR units undergo pre-shipment inspection (PSI). If there is an issue with ST1VAFE3BXTR, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The ST1VAFE3BXTR part is unused and in its original packaging.

Return procedure for ST1VAFE3BXTR:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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