AXO315T0 is a high-temperature single-axis closed-loop MEMS accelerometer designed for MWD/LWD directional drilling in oil & gas downhole applications.# AXO315T0

One sentence summary:** AXO315T0 is a high-temperature single-axis closed-loop MEMS accelerometer from Tronics for oil & gas downhole MWD/LWD directional drilling. It serves as a replacement for quartz accelerometers, featuring high temperature resistance and robust shock & vibration immunity for downhole inclination measurement.

 Key Specifications

1. Axis: Single-axis

2. Measurement range: ±14 g

3. Power supply: 4.75~5.25V (IO level compatible with 5V)

4. Communication interface: 24-bit SPI digital output, resolution 2 μg/LSB

5. Noise density: 10 μg/√Hz

6. Full-temperature residual bias error: 0.8 mg

7. Scale factor temperature error: 500 ppm

8. Vibration Rectification Error (VRE): 20 μg/g² (strong vibration rejection)

9. Bandwidth: >300Hz, latency 1ms

10. Operating temperature: **-30℃ ~ +150℃**; powered lifetime >1000 hours at 150℃

11. Package: 28-pin hermetic ceramic SMD J-LEAD, dimension 12.45×12.45×5.5mm

12. Bias instability: 3μg at room temperature; 5μg at 150℃

13. Compliance: RoHS, REACH

Features

1. Closed-loop MEMS architecture: Compared with open-loop accelerometers, it delivers excellent vibration and shock resistance, significantly reducing measurement drift induced by vibration. It accurately measures gravity components to calculate inclination under severe downhole vibration.

2. Built-in **power-on self-test + continuous self-test**, real-time sensor status monitoring for safety diagnosis of downhole equipment.

3. Factory full-temperature calibration. Outputs 24-bit digital acceleration data. The MCU reads raw acceleration values, and inclination angles are calculated by system algorithm.

4. Hermetic ceramic package, resistant to harsh downhole conditions including temperature cycling, humidity, dust and mechanical shock.

5. Integrated temperature sensing (raw data, not factory-calibrated), available for system temperature compensation.

## Applications

Primarily designed for **oil & gas downhole directional drilling**

- MWD (Measurement While Drilling)

- LWD (Logging While Drilling)

- Wireline logging, attitude and inclination measurement for directional drilling tools

> Extended use: Also applicable to other special industrial attitude measurement scenarios with high temperature and high vibration (downhole exploration, special geological monitoring). **Not a consumer or general industrial inclinometer.**

 Brief Comparison with AXO301

- AXO301: ±1g range, high-precision inclination measurement for general industrial ambient temperature use, narrower temperature range, for ground equipment and structural monitoring.

- AXO315T0: ±14g wide range, high-temperature variant, withstands 150℃ downhole high temperature plus heavy shock and vibration, targeted at oil & gas MWD/LWD drilling.