Sensonor STIM377H MEMS IMU

Sensonor STIM377H MEMS IMU

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The STIM377H from Sensonor is a high-performance, tactical-grade, non-GPS aided Inertial Measurement Unit (IMU) in a hermetic package built into a hermetic package. Small and lightweight, the package is a hermetic aluminum enclosure with a glass-to-metal sealed electrical micro-d connector and a laser-welded lid to secure long-term hermetic operation. All parts are tested for fine and gross leak to conform to MIL-STD-883J, Class H.

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Overview

The Sensonor STIM377H is an IMU consisting of 3 high accuracy MEMS-based gyros, 3 high stability accelerometers and 3 high stability inclinometers in a miniature package. Each axis is factory-calibrated for bias, scale factor and compensated for temperature effects to provide highaccuracy measurements in the temperature range -40°C to +85°C. The unit runs off a single +5V supply.

The STIM377H communicates via a standard high-level RS422 interface. The use of a 32-bit RISC ARM microcontroller provides flexibility in the configuration, like choice of output unit, sample rate, low pass filter ‒3dB frequency and RS422 bit-rate and protocol parameters.
All configurable parameters can be defined when ordering or set by customer.

When the STIM377H is powered up, it will perform an internal system check and synchronize the sensor channels. As an acknowledgement of the complete power-up sequence, it will provide special datagrams containing part number, serial number, configuration and bias trim data. STIM377H will then automatically proceed to provide measurement data.

The measurement data is transmitted as packages of data on a fixed format (datagram) at intervals given by the sample rate together with a synchronization signal (TOV). The datagram is in binary coded format in order to have an efficient transfer of data. In addition to the measurement data itself, the datagram contains an identifier, status bytes and a 32 bit CRC (Cyclic Redundancy Check) to provide high degree of fault detection in the transmissions. The status bytes will flag any detected errors in the system. STIM377H can also be configured to transmit data only when triggered by a separate digital input signal (ExtTrig).

For more advanced users, the gyro may be put in Service Mode. In this mode all the configuration parameters can be intermediately or permanently changed by overwriting the current settings in the flash memory. In Service Mode the commands and responses are in a human readable format (ASCII); to enable the use of terminal-type software during typical product integration. Service Mode also provides the ability to perform single measurements, perform diagnostics and obtain a higher detail level of detected errors reported in the status bytes.

Finally, the STIM377H may be put in Utility Mode. This mode is similar to Service Mode, but made for machine-machine communication.

Features

  • Small size, low weight and low cost
  • Hermetic package without paint and separate label
  • ITAR free
  • Insensitive to magnetic fields
  • 0.3 °/h gyro bias instability
  • 0.15 °/√h angular random walk
  • ±400 °/s angular rate input range
  • 10 °/h gyro bias error over temperature gradients
  • 0.05 mg accelerometer bias instability
  • ±10 g acceleration input range (optional ranges available)
  • 3 inclinometers for accurate levelling
  • Backwards compatible with STIM300

Technical Specifications

Performance
Range Gyro:± 400 °/s
Range Accelerometer:±10 g
Digital Output:24 bit RS422
Angular Random Walk:0.15 °/√h
Sampling frequency:2000 SPS
Physical
Weight:55 g
Size:44.8 mm x 38.6 mm x 21.5 mm
Supply Voltage:5.5 V Max
Power Consumption:2.0 W Max
Environmental
Operating Temperature:-40 °C to +85 °C
Mechanical Shock:1500 g

Video

Ordering

The STIM377H MEMS IMU by Sensonor is available through Canal Geomatics. If you would like more information about this product, please feel free to get in touch with us by completing the Request Pricing form.

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