Bosch BMA456 3-Axis Accelerometer Sensor, ±16g, Ultra-Low Power 14µA, Step Counter & Activity Recognition, I²C/SPI, LGA-12

Name: Bosch BMA456 3-Axis Accelerometer Sensor, ±16g, Ultra-Low Power 14µA, Step Counter &amp; Activity Recognition, I²C/SPI, LGA-12
Brand: Bosch
SKU: SENS-1074
Price: 409.00 INR
Availability: OutOfStock

₹409.00 (Inclusive of all taxes)

Out of Stock

The Bosch BMA456 is a 3-axis digital accelerometer in an ultra-compact LGA-12 package, designed for ultra-low-power wearable and IoT applications. It features a 16-bit resolution, programmable ranges up to ±16g, and integrated step counting and activity recognition, communicating via I²C or SPI interfaces compatible with 1.2V to 3.6V logic systems.

Features

Ultra-low power consumption of 14µA (typical) in low-power mode for extended battery life.
High-resolution 3-axis sensing with 16-bit digital output and programmable ranges (±2g, ±4g, ±8g, ±16g).
Integrated intelligent features including step counter and activity recognition algorithms.
Flexible digital interfaces: I²C and SPI (3-wire & 4-wire) for easy MCU integration (Arduino, Raspberry Pi, ESP32).
Compact surface-mount LGA-12 package (2mm x 2mm x 0.65mm) ideal for space-constrained wearable designs.

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Description

The Bosch BMA456 is a MEMS-based 3-axis accelerometer engineered for precision motion sensing in power-sensitive applications. Its core utilizes a micromachined sensing element coupled with a high-resolution 16-bit ADC, providing accurate acceleration data across four user-selectable full-scale ranges. The sensor’s architecture is optimized for minimal quiescent current, making it a cornerstone for fitness trackers, smartwatches, and always-on IoT devices.

Advanced on-chip features include a configurable 1 kB FIFO buffer for efficient data management, programmable digital filters for noise reduction, and motion-triggered interrupts that allow the host processor to remain in sleep mode until a significant event occurs. The integrated step detection and activity recognition (like walking, running, stationary) algorithms offload processing from the main MCU, further conserving system power. Its wide VDDIO range from 1.2V to 3.6V ensures compatibility with modern low-voltage microcontrollers and system-on-chips.

Key Features

Ultra-low operating current: 14 µA typical in low-power mode for maximum battery longevity.
High-performance digital core: 16-bit resolution with programmable output data rates from 0.78 Hz to 1.6 kHz.
Intelligent on-chip processing: Integrated step counter and activity recognition for wearables.
Efficient data handling: 1 kB built-in FIFO buffer and motion-triggered interrupt system.
Robust digital communication: Supports both I²C (up to 3.4 MHz) and SPI (3-wire & 4-wire) interfaces.
Miniaturized form factor: 2.0 x 2.0 x 0.65 mm LGA-12 surface-mount package.
Wide supply voltage compatibility: VDDIO range from 1.2 V to 3.6 V for mixed-voltage systems.
Programmable functionality: Selectable acceleration ranges and configurable digital filters.

Applications

Wearable Electronics: Step counting and activity tracking in fitness bands and smartwatches.
IoT and Smart Devices: Gesture-based user interfaces and motion-activated power management.
Portable Medical Devices: Fall detection and activity monitoring for healthcare applications.
Asset Tracking: Tamper detection and orientation sensing in logistics and shipping.
Consumer Electronics: Screen rotation, gaming controllers, and pedometer functionality.

Technical Specifications

Manufacturer Part Number	BMA456
Sensor Type	3-Axis Digital Accelerometer (MEMS)
Measurement Range	±2g, ±4g, ±8g, ±16g (Programmable)
Resolution	16-bit Digital Output
Interface	I²C, SPI (3-wire & 4-wire)
Supply Voltage (VDDIO)	1.2 V to 3.6 V
Current Consumption (Typical)	14 µA (Low-Power Mode)
Output Data Rate (ODR)	0.78 Hz to 1.6 kHz
Built-in Features	Step Counter, Activity Recognition, FIFO, Interrupts
FIFO Buffer Size	1 kB
Package Type	LGA-12
Package Dimensions	2.0 mm x 2.0 mm x 0.65 mm
Mounting Type	Surface Mount (SMD)
Operating Temperature Range	-40°C to +85°C

Frequently Asked Questions

What is the typical power consumption of the BMA456 accelerometer?

The BMA456 is designed for ultra-low-power operation, consuming a typical current of just 14 µA in its low-power mode. This exceptionally low current draw is a key feature for battery-powered wearable and IoT devices, enabling extended operational life between charges.

What microcontrollers or development platforms is the BMA456 compatible with?

The BMA456 is highly compatible with common embedded platforms. Its 1.2V to 3.6V VDDIO range makes it suitable for 3.3V systems like ESP32, Raspberry Pi Pico, and many STM32 MCUs, as well as 1.8V domains. Communication is via standard I²C or SPI buses, supported by libraries for Arduino, PlatformIO, and other IDEs.

Does the BMA456 require external signal conditioning or is it a complete digital sensor?

The BMA456 is a fully integrated digital sensor. It contains the MEMS sensing element, a 16-bit ADC, digital filters, the FIFO buffer, and the I²C/SPI interface on a single chip. No external active components are required for basic acceleration measurement, simplifying PCB design and BOM cost.

How do I access the step counter and activity recognition data?

The step count and activity type (e.g., walking, running, stationary) are processed by dedicated algorithms inside the BMA456. The results are available via the I²C or SPI interface by reading specific data registers, which reduces the computational load on the host microcontroller and saves system power.

What is the purpose of the integrated FIFO buffer?

The 1 kB FIFO (First-In, First-Out) buffer allows the sensor to store up to 512 samples of acceleration data. This enables the host MCU to sleep for longer periods while the sensor continues logging data, waking up only to burst-read the stored data, which is a critical technique for minimizing overall system power consumption.