STIM 300 Inertial Measurement Unit / IMU

STIM300 is a high performance and rugged Inertial Measurement Unit (IMU) comprised of 3 highly accurate MEMS gyros, 3 high stability accelerometers and 3 inclinometers. The IMU is factory calibrated and compensated for temperature effects over the full temperature operating range. The STIM300 is based upon Sensonor's proven gyro sensor technology in production for more than a decade, and its high precision Gyro Modules are already designed into many applications worldwide. Another advantage of the Sensonor MEMS technology is the very low vibration and shock sensitivity in any direction.

Range and features

STIM300 full-scale angular rate input range is ±400°/s and the output is capped at ±480°/s. Standard acceleration input range is ±10g. Axis misalignment of as little as 1mrad is achieved by electronic axis alignment. STIM300 requires a single +5Vdc power supply and has a digital serial RS422 interface.

STIM300 offers several user selectable output formats and sample rates for gyro and accelerometer data:

 Angular Rate

 Incremental Angle

 Average Angular Rate

 Integrated Angle

 Acceleration

 Incremental Velocity

 Average Acceleration

Device configurations and self-diagnostics

A reliable RISC ARM microcontroller enables easy device configuration and programming. The user selectable Service Mode allows for setting the output unit format, sample frequency, LP filter cut-off frequency, RS422 transmission bit rate and line termination. Service Mode also enables single measurements on demand, and to access detailed diagnostics information.

evaluation tools

STIM300 evaluation tools supporting PCI or USB connectivity are available. The evaluation tools offer easy access to measurement data and configuration of the IMU. It supports data sampling at alternative rates, graphical presentation, and data logging to file. The evaluation tools contain a RS422 interface for USB or PCI hardware setup, all necessary cabling, and PC software.

Application areas

The STIM300 IMU is well suited for stabilization, guidance and navigation applications in Industrial, Aerospace and Defense markets. It is a crucial building block for inertial navigation systems in UAVs, AUVs, AGVs, UGVs and ROVs, robotics, and more, and offers the designer an ITAR free alternative. In many applications, STIM300 can competitively replac IMU's based on Fiber Optic Gyros (FOGs) and improve system performance with respect to robustness, reliability, size, weight, power and cost.

parameter	Min	Nom	Max	Unit
GENERAL
Weight		55		g
Operating temperature	-40		85	°C
Supply voltage	4.5	5.0	5.5	V
Supply current		300		mA
Start-up time		3		s
Sample rate			2000	SPS
Mechanical shock, any direction			1500	g
RS422 transmission bit rate			1.84	Mbit/s
Misalignment		1		mrad
GYRO
Input range		±400		°/s
Non-Linearity (conditions: ±200)		15		ppm
Resolution		0.22		°/h
Bias instability		0.5		°/h
Angular random walk		0.15		°/√h
Bias error over temperature gradients		±10		°/h rms
Linear acceleration effect
Bias		1		°/h/g
Scale Factor		50		°/h/g
Scale factor accuracy		±500		ppm
ACCELEROMETER
Input range		±10		g
Resolution		1.9		μg
Bias instability		0.05		mg
Velocity random walk		0.07		m/s/√h
Bias error over temperature gradients		±2		mg rms
Scale factor accuracy		±300		ppm
INCLINOMETER
Input range		±1.7		g
Resolution		0.2		μg
Scale factor accuracy		±500		ppm