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BMA423

Name: BMA423
Rating: 4.7 (12 reviews)

ACCEL 2-16G I2C/SPI 12LGA

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製造商。部分 #BMA423
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規格

Part Status	Obsolete
Base Product Number	BMA423
Type	Digital
Axis	X, Y, Z
Acceleration Range	±2g, 4g, 8g, 16g
Bandwidth	8Hz ~ 1.6kHz
Output Type	I2C, SPI
Voltage - Supply	1.62V ~ 3.6V
Features	Adjustable Bandwidth, Selectable Low Pass Filter
Operating Temperature	-40°C ~ 85°C
Mounting Type	Surface Mount
Package	12-WFLGA
Supplier Device Package	12-LGA (2x2)
Packaging	Tape & Reel (TR)

概述

Description

The BMA423 is Bosch Sensortec’s ultra-low-power 3-axis accelerometer designed for wearables and mobile devices. It provides accurate motion sensing with built‑in activity/inactivity detection, pedometer, and gesture recognition, plus a FIFO and programmable interrupts for power-efficient event handling. It supports I2C and SPI interfaces and operates from a small, low-voltage supply, making it ideal for battery-powered products. In practice, you can detect steps, general movement, wake-up events, and simple gestures with minimal MCU load. Applications include fitness trackers, smartwatches, health sensors, AR/VR controllers, and other IoT devices requiring motion sensing. Bosch provides driver libraries and register-level APIs to configure data rate, full-scale, interrupts, and low‑power modes.

Features

Key features of the BMA423 (3-axis accelerometer, ultra-low power):
- Ultra-low-power accelerometer with multiple power modes, including wake-on-motion.
- Wide operating voltage and small package: I2C/SPI interface, suitable for wearables.
- Programmable dynamic range: selectable full-scale (e.g., ±2/±4/±8/±16 g) and high-resolution output (12–16 bit).
- Configurable data rate (ODR) and low noise for accurate motion sensing.
- On-chip motion/tilt/orientation detection and free-fall sensing.
- Built-in pedometer/step counter and activity recognition support.
- Interrupts with multiple latch/priority options; data-ready and event-based signaling.
- FIFO buffer for efficient data capture and reduced host processing.
- On-chip temperature sensor for bias compensation and performance monitoring.
- Small 3×3 mm LGA package with robust performance over temperature and motion.
Note: exact ODR, ranges, and feature set can vary by revision; refer to the latest datasheet for precise specifications.

Package

BMA423 uses a wafer-level chip-scale package (WLCSP), i.e., a CSP around 2×2 mm (8‑pad) style package.

Pinout

- Pin count: 12 pins (LGA package).
- Function: Bosch BMA423 is a 3-axis accelerometer with motion/sensor features (e.g., activity/pedometer). It supports I2C or SPI interfaces, and includes power pins (VDD, VDDIO, GND), interrupt outputs (e.g., INT1/INT2), and a reset pin (NRST/RESET). The SPI variant uses CS, SCK, MOSI, MISO; the I2C variant uses SDA and SCL.

Manufacturer

The BMA423 is manufactured by Bosch Sensortec, a subsidiary of Robert Bosch GmbH (Bosch). Bosch Sensortec is a German multinational company that designs and markets MEMS sensors (accelerometers, gyros, magnetometers, etc.) for mobile devices, wearables, IoT, and automotive applications.

Application

BMA423 is a low power 3-axis accelerometer for motion, orientation and gesture sensing. Common applications include wearables (fitness trackers, smartwatches, sleep/activity monitoring), mobile/AR/VR devices (screen orientation, gesture control), health monitoring and elder care (falls/activity detection), sports analytics (motion tracking), smart home/IoT (gesture-driven UI, motion-activated triggers), robotics/drones (stabilization, navigation), and industrial automation (machine monitoring, vibration sensing).

Equivalent

Possible equivalents (3-axis digital accelerometers from other vendors):
- STMicroelectronics: LIS3DH, LIS2DH12
- Analog Devices: ADXL345, ADXL362
- NXP Semiconductors: MMA8452Q, MMA8652FC
(Provided as comparable low-power, I2C/SPI accelerometers.)