Sensors

Crista Inertial Sensors

Crista IMU

Crista Sensor Head

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The Crista OEM Sensor Head

 is a small, solder down, three axis inertial sensor package available for direct integration into end user applications. It provides high bandwidth raw measurements from the MEMS gyroscopic rate sensors and accelerometers. Direct SPI interface is provided to the A/D converter and serial EEPROM containing gain, temperature calibration, and alignment correction data. The Crista OEM Sensor Head is also available as complete IMU assembly with a RS-232 serial interface.
Crista Sensor Head

  • 16 Bit Resolution Data Conversion
  • SPI interface to analog to digital converter and calibration EEPROM
  • Three Axis Sensing, 300 deg/sec. rate and 10G acceleration
  • Gyro and accelerometer diagnostic test modes
  • Solder down inertial sensor for customer processor board
Gyros
empty¹Range: ±300 º /sec
empty²Scale Factor Error: < 3°/sec (@ 25°C)
emptyIn-Run Bias Error  
emptyFixed Temperature: <0.2°/sec (warmed up)
emptyOver Temperature: <0.6°/sec
   
emptyLinear Acceleration
Effects:		 0.2 º /sec / G typical;
1.5 º /sec / G max uncorrected.
emptyNoise: (1, no
over-samples) 		< ± 0.7°/sec
empty³Cross Axis Rate
Error:		 2.6% uncorrected
(Includes alignment and off axis acceleration)
 
emptyA/D Measurement
Resolution:		 0.0155°/sec
emptyConverted Data Rate
Resolution:		 0.009 º /sec
(max rate = 300 º /sec)
emptyBandwidth: 2 order LPF Fc=100Hz
Interface
  
emptySerial Interface: SPI to A/D and EEPROM
emptyData Output Rate: 8 channels out at 10KHz
emptyInternal A/D Rate: 2 MHz SPI Clk
Electrical
  
emptyVIN: 5.5 – 8 Volts
emptyPower: 0.2 W (typical)
Mechanical
  
emptySize: 1.10” x 1.15” x 0.59”
emptyWeight: 7.0 grams (0.25oz)
Accelerometers
  
emptyRange: ± 10G
emptyScale Factor Error: < 100 mG (0.98 m/s²)
(@ 25°C)
 
emptyIn-Run Bias Error  
emptyFixed Temperature: < 25 mG (0.245 m/s²)
emptyOver Temperature: < 51 mG (0.500 m/s²)
   
emptyTurn-on to Turn on Bias: < 30 mG (0.295 m/s²)
emptyNoise: (1ó, no
over-samples)		 < ± 12 mG
(0.120 m/s²)
empty³Cross Axis Error: 2.6% uncorrected
(Includes alignment and off axis acceleration)
 
emptyA/D Measurement
Resolution		 0.62 mG
0.30 mG
emptyConverted Data Rate
Resolution		 0.30 mG
(max rate = 10 G)
emptyBandwidth: Simple LPF. Fc=100 Hz
 
  1. Higher rate ranges for the Gyros are possible. Contact CCT for more information.
  2. Based on room ambient temperature. Nonlinearity from best fit straight line. Typically much better at lower rates/accelerations.
  3. Includes alignment and off axis acceleration.
Environmental
  
emptyOperating Temp: -40C to +70 C
(Calibrated Temp. Range)
emptyMax Acceleration: 500 G

The Crista Developer's Kit

 provides first time Crista users all the parts needed for setting up the Crista IMU in a lab environment for bench-top testing and facilitating vehicle integration.
Inertial Measurement Unit Crista IMU Assembly Crista IMU 9-Pin Serial Cable Crista IMU Developer's Cable Crista IMU Serial Support
Crista IMU Developer's Kit
CCT Part No. 900-9006-00
  • Crista IMU - Includes the tools, installers and related support documentation for the Crista IMU.
  • Crista Sensor Head - Includes the installers, documentation, and drivers for the Crista Sensor Head.
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