Name: BMA421
Brand: BOSCH
SKU: BMA421
Availability: OutOfStock

Specifications

Product Introduction

The BMA421 is an ultra-small, triaxial, low-g acceleration sensor with digital interfaces, aiming for low-power consumer electronics applications. Featuring 12 bit digital resolution and measurement of accelerations in 3 perpendicular axes, it senses any-motion/no-motion and enables plug 'n' play step counting in smart phones and wearable devices. Furthermore, the device is optimized to fulfill low power step counter requirements.

Features

Ultra-small footprint and lowest power consumption
12-bit digital resolution
Programmable measurement ranges: ±2g, ±4g, ±8g, ±16g
Low-power step counting at 25 µA in smartphones and wearable devices
High performance measurement mode with low pass filters
Robust to vibrations and aliasing
Highly configurable for system integration flexibility
Integrated 1 kB FIFO data buffer
SPI and I2C digital interfaces
2x digital interrupt pins
Wide supply voltage ranges (VDD and VDDIO)
Shock resistance up to 10,000 g

Applications

Step-counting in smartphones
Step-counting in wearable devices
Low power user interaction
Gesture recognition
Advanced power management for mobile devices
Tilt compensation for electronic compass

Specifications Table

Parameter	Value
Digital resolution	12 bit
Resolution	0.98 mg (in ±2g range)
Measurement ranges	±2 g; ±4 g; ±8 g; ±16 g (programmable)
Sensitivity (calibrated)	±2 g: 1024 LSB/g; ±4 g: 512 LSB/g; ±8 g: 256 LSB/g; ±16 g: 128 LSB/g
Zero-g offset	±100 mg (typ., over life-time)
Noise density (typ.)	300 µg/√Hz
Output data rate	1600 Hz … 8 Hz (programmable)
Digital inputs/outputs	SPI & I2C, 2x digital interrupt pins
Supply voltage (VDD)	1.62 … 3.6 V
I/O supply voltage (VDDIO)	1.2 … 3.6 V
Temperature range	-40 … +85 °C
Current consumption – full operation	150 µA
Current consumption – low-power mode	13 µA (@ 50 Hz data rate)
FIFO data buffer	1 kB
LGA package	2 x 2 x 0.95 mm³
Shock resistance	10,000 g x 200 µs

To learn more, please download the PDF.