AXO301-EVB3 is an evaluation board for TDK Tronics AXO301 single-axis closed-loop MEMS accelerometer.

It is a TDK product equipped with the AXO301 sensor and peripheral passive components. It is designed for rapid evaluation and testing of the high-precision AXO301 accelerometer chip, and is NOT an end-product sensor module.

## I. Key Specifications (Evaluation Board + On-board AXO301 Chip)

Evaluation Board Hardware Specifications

1. Power Supply: Single 5V supply; Communication IO level supports **1.8V / 3.3V / 5V**, compatible with most MCUs.

2. Communication Interfaces: SPI (plug-and-play), RS422, USB; Direct plug-in support for Arduino Leonardo / Yun.

3. Sensor Axis: Single-axis

4. On-board Components: AXO301 closed-loop MEMS accelerometer plus supporting resistive and capacitive passive components.

Core Specifications of AXO301 Sensor Chip (the chip mounted on the evaluation board)

1. Measurement Range: ±1 g

2. Noise Density: 8 μg/√Hz

3. Resolution: 50 μg

4. Output: 24-bit SPI digital output

5. Maximum Data Rate: 950 Hz

6. Architecture: Closed-loop force-balance MEMS with built-in BIST self-test.

7. Temperature Range: -40℃ ~ +85℃

8. Vibration Resistance: Compliant with railway vibration and shock standard EN61373.

## II. Functions

1. Acceleration Acquisition: Measures single-axis acceleration; capable of **tilt measurement (inclinometer)** under static conditions.

2. Chip Evaluation: Quickly verify AXO301 performance, noise, temperature drift and self-test functions, eliminating the need for custom PCB design.

3. Data Acquisition: Native SPI output. Real-time reading of acceleration, temperature and status registers with Arduino host computer.

4. Communication Adaptation: Multi-level SPI and RS422 expansion for easy integration into industrial control acquisition systems.

5. Built-in BIST Self-test: Sensor self-test triggered upon power-up or by command to check chip health status.

 III. Scope of Application

> The evaluation board is a development and test tool; the AXO301 chip is used for final end products.

Use Cases for the Evaluation Board

- Evaluation during R&D, algorithm verification, bench calibration (thermal chamber + rate table test)

- Inertial sensor prototyping for universities and laboratories

Target Applications of AXO301 Chip

1. Railway Industry: Train tilt measurement, acceleration/deceleration measurement, train positioning assistance (EN61373)

2. Industrial Sector: Tilt monitoring for construction machinery, tilt monitoring of factories/buildings, servo motion control

3. Inertial navigation assistance for robots, AGVs and unmanned vehicles

4. High-precision static tilt measurement for heavy equipment, vessels and aerospace ground equipment

> Positioning: Replacement for traditional quartz inclinometers. Features low noise and high stability, suitable for high-precision tilt measurement in static/low-speed scenarios.

 Supplementary Points

- Advantages: Closed-loop MEMS with ultra-low noise and excellent static tilt accuracy; built-in self-test, 24-bit SPI. Outperforms conventional open-loop MEMS accelerometers.

- Limitations: Single-axis only, ±1g full scale, not suitable for high-shock or high-dynamic acceleration scenarios; not AEC-Q100 automotive qualified.

- Competitive Benchmarking: Competes against quartz tilt sensors with benefits of smaller size and better cost; compared with ordinary MEMS, it delivers superior noise performance and long-term stability.