IMU300 High-Precision 6-Axis MEMS IMU | ±500°/s, ±10g, RS422 Interface

Inertial Measurement Unit

The IMU300 is a high-performance, 6-axis Inertial Measurement Unit (IMU) integrating three high-precision MEMS gyroscopes and three high-stability accelerometers. Designed for demanding applications, it delivers reliable and accurate motion sensing in a compact, low-power package, complete with a digital RS422 interface.

IMU300 provides users with several output formats for both the gyroscope and accelerometer, as follows:

• Angular rate
• Incremental angle
• Average angular rate
• Integrated angle
• Acceleration
• Incremental velocity
• Average acceleration
• Integrated velocity

Application Fields:

• Dynamic stabilization platforms
• Aircraft control
• Inertial integrated navigation
• Other scenarios and fields require the measurement of three-axis angular rate and three-axis acceleration of moving objects.

Device Configuration and Self-Diagnostics:

IMU300 utilizes a 32-bit RISC ARM microcontroller. It offers flexible configuration of parameters such as output units, sampling rate, low-pass filter with -3dB frequency, RS422 baud rate, and protocol settings. All configurable parameters can be defined at the time of ordering or set by the customer.

During operation, IMU300 continuously monitors its internal status, and users can access the following monitored parameters:

• Check of internal references
• Check of sensors (error and overload)
• Check of internal temperatures
• Check of RAM and flash
• Check of supply voltage

Host Computer Software Support:

IMU300 supports debugging using host computer software. Through the RS422 interface, the software allows for easy and quick access to measurement data or modification of configuration settings. It also supports data logging and saving to a file.

Composition and Functional Block Diagram:

Performance Specifications and Model Selection:

The performance of the gyroscope for the general-purpose product is detailed in the table below.

Table 1：Gyroscope Specifications Table

Parameter（gyros）	Conditions	Min	Nom	Max	Unit	Note
Full Scale			500		deg/s	1
Resolution			24		bits
Scale Factor	25℃		15000		Isb/deg/s	Nominal Value
Scale Factor Repeatability（1σ）			＜30		ppm	2
Scale Factor Nonlinearity（1σ）			＜150		ppm	3
Bandwidth（-3dB）		16		262	Hz	Configurable
Sample Rate				2000	samples/s	Configurable
Bias Instability （Allan）	Allan Variance @25°C		＜0.3		deg/h
Bias Stability@10s			＜3		deg/h
Bias Stability @1s			＜7.5		deg/h
Bias Temperature Drift（1σ）			＜20		deg/h	Over the full temperature range
Bias Repeatability（1σ）			＜3		deg/h
Broadband Noise	25℃		＜0.4		deg/s
G-Value Sensitivity			＜1		°/hr/g	Three-axis direction
Vibration Rectification Error（VRE）	（12gRMS，20-2000HZ）		＜1		°/hr/g
Power-Up Time			750		ms

Note 1: The gyroscope maintains a saturated output state at ±105% FS when exceeding the measurement range. 
Note 2: Performance metrics are repeated daily from the specified operating temperature.

Table 2：Accelerometer Specifications Table

Parameter（accelerometers）	Conditions	Min	Nom	Max	Unit	Note
Full Scale			±10		g	4
Resolution			24		bits
Scale Factor Accuracy	Calibration Accuracy	266	270	274	mv/g
Long-Term Scale Factor Stability Scale Factor Temperature Coefficient	@20℃	20	300 120	220	ppm ppm/℃
Non-Linearity	IEEE Norm，% of full scale		0.3	1.0	%
Bandwidth（-3dB）		16		262	Hz	Configurable
Sample Rate				2000	samples/s	Configurable
Bias switch on/off repeatability			0.75		mg
Bias Stability			0.15		mg
Bias Error Under Temperature Influence Long-Term Zero Bias Repeatability@20℃	ΔT ≤ ±1°C/min @1000g @6000g	－2	±0.5 1.5 7.5	2	mg/℃ mg mg