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System Overview

System Architecture

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LPMS-U3 System Architecture

Pinout Description

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Please note that TTL, RS232 and CAN Bus pins are mutually exclusive. Only one communication interface is enabled depending on the model. Communication interfaces for different LPMS-U3 models are listed below:

Default settings for communication interface:

• USB: USBXpress, convertible to virtual COM port，921600bps，8N1 

• RS232: 921600bps，8N1

• CAN: 500kbps, terminal resistor enabled

Coordinate System

The coordinate system for LPMS-U3 is defined as follow:

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LPMS-U3 Coordinate system

Accelerometer output convention

A positive acceleration output will be produced when the sensor is accelerated at the same direction of the positive axes. When the sensor is at rest with Z axis pointing upwards, the calibrated output of the accelerometer is expected to be [0 0 +1g] indicating the acceleration due to the force of gravity.

Gyroscope output convention

Gyroscope output follows the right hand rule where rotation along an axis following the right hand convention will produce a positive angular velocity. The calibrated output of the gyroscope is expected to be close to zero when the sensor is at rest.

Magnetometer output convention

XYZ axes indicates the direction of magnetic field that generates a positive output reading in normal measurement configuration.

Euler output convention

Euler output is in degree. The rotation sequence follows global XYZ rotation. In other words, the current orientation of the sensor can be obtained by rotating at the euler values along global X → global Y → global Z axis.

Range of euler output is as follow:

• X Angle: -180° ~ +180°

• Y Angle: -90° ~ +90°

• Z Angle: -180° ~ +180°

Specifications

Main Parameters

Accelerometer Parameters

Gyroscope Parameters

Magnetometer Parameters

Packaging details

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LPMS-U3 Packaging details