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Inertial Measurement Unit Integrating Three Accelerometers And Gyroscope And Inclinometer

Inertial Measurement Unit Integrating Three Accelerometers And Gyroscope And Inclinometer

  • Inertial Measurement Unit Integrating Three Accelerometers And Gyroscope And Inclinometer
  • Inertial Measurement Unit Integrating Three Accelerometers And Gyroscope And Inclinometer
  • Inertial Measurement Unit Integrating Three Accelerometers And Gyroscope And Inclinometer
  • Inertial Measurement Unit Integrating Three Accelerometers And Gyroscope And Inclinometer
Inertial Measurement Unit Integrating Three Accelerometers And Gyroscope And Inclinometer
Product Details:
Place of Origin: China (Mainland)
Brand Name: Kacise
Certification: certificate of explosion-proof, CE
Model Number: STIM300
Payment & Shipping Terms:
Minimum Order Quantity: 1pcs
Packaging Details: each unit has individual box and all boxes are packed in standard packages or customers requests available
Delivery Time: 5-8 working days
Payment Terms: T/T, Western Union, MoneyGram
Supply Ability: 1000 Pieces per Week
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Detailed Product Description
Mechanical Shock: 1 500g/0.5ms Half-sine RxD+ Or RxD- To GND: -0.3V To +7V
Storage Temperature: -55°C To +90°C ESD Human Body Model: ±2kV

Inertial Measurement Unit STIM300

1 FEATURES:

● Miniature package

● Low noise

● Low bias instability

● Excellent performance in vibration and shock environments

● 9 axes offered in same package

● Electronically calibrated axis alignment

● Gyros based on Safran ButterflyGyroTM

● Single-crystal silicon technology

● No intrinsic wear-out effects

● High stability accelerometers and inclinometers

● Insensitive to magnetic fields

● Full EMI compliance

● Digital interface, RS422

● Fully configurable

● Continuous self-diagnostics

● RoHS compatible

 

2 GENERAL DESCRIPTION

STIM300 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 high-accuracy measurements in the temperature range -40°C to +85°C. The unit runs off a single +5V supply.

STIM300 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 STIM300 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. STIM300 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. STIM300 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, STIM300 may be put in Utility Mode. This mode is similar to Service Mode, but made for machine-machine communication.

 

3 BLOCK DIAGRAM:

Inertial Measurement Unit Integrating Three Accelerometers And Gyroscope And Inclinometer 0

4 ABSOLUTE MAXIMUM RATINGS

Stresses beyond those listed in Table 4-1may cause permanent damage to the device.

Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime.

Table 4-1: Absolute maximum ratings

 

Parameter Rating Comment

Mechanical shock

ESD human body model Storage temperature

VSUP to GND

RxD+ or RxD- to GND

RxD+ to RxD-

TxD+ or TxD- to GND

ExtTrig to GND

TOV to GND

NRST to GND

AUX+ to AUX-

AUX+ or AUX- to GND Chassis to GND

Helium sensitivity

1 500g/0.5ms half-sine

±2kV

-55°C to +90°C

-0.5 to +7V

-0.3V to +7V

±6V

-8V to +8V

-0.3V to +7V

-0.3V to +7V

-0.3V to +7V

±6.5V

±6.5V

500VDC

Any direction. Ref: MIL STD-883G

Ref: JEDEC/ESDA JS-001

Up to 1000 hours

 

with 120Ω Line Termination = ON

 

 

 

 

 

 

Not to be exposed to helium concentrations higher than those normally found in the atmosphere

 

5 SPECIFICATIONS

Table: Operating conditions

 

Parameter Conditions Min Nom Max Unit Note
INPUT RANGE, ANGULAR RATE   ±400 °/s  
INPUT RANGE, ACCELERATION   ±10 g 1
INPUT RANGE, INCLINATION   ±1.7 g  
POWER SUPPLY   4.5 5.0 5.5 V 2,3
OPERATING TEMPERATURE   -40 +85 °C  

Note 1: Other ranges available, ref.Table 5-4(5g),Table 5-6(30g) andTable 5-7(80g)

Note 2: At supply voltages above 5.85V (nominal value) an internal voltage protection circuit will cut power and the unit will go into reset until the voltage is back within operating conditions.

Note 3: At supply voltages below 4.05V (nominal value) the unit will go into reset until the voltage is back within

operating conditions. Due to power consumption being much lower in reset compared to normal operation, the series resistance between power source and STIM300 could give rise to an oscillating behavior of the input

voltage to the unit.

 

Table: Functional specifications, general

 

Parameter Conditions Min Nom Max Unit Note

POWER CONSUMPTION

Power consumption

  1.5 2 W  
TIMING        
Start-Up time after Power-On   0.3 s 1
Time to transmit after Reset   0.2 s 2
Time to valid data T=+25°C

0.7

1

s

s

3

3

RS422 Bit-Rate   ref.Table 5-11    
RS422 Bit-Rate Accuracy   ±1 % 4

RS422 PROTOCOL

Start Bit

Data Length

Parity

Stop Bits

 

1

8

None

1

bit

bits

bit

 

 

5

5

RS422 LINE TERMINATION        
Input resistance Line termination = ON 120 Ω  
Input resistance Line termination = OFF 48 125  
RESET (NRST PIN)        
Logic levels

“high”

“low”

2.3

0.6

V

V

 
Minimum hold time for reset   1 µs  
Pull-Up Resistor   80 100  
EXTERNAL TRIGGER (ExtTrig        
PIN)        
Logic levels

“high”

“low”

2.3

0.6

V

V

 
Trigger   Negative transition    
Time between triggers

Measurement unit:

angular rate

incremental angle

average rate

integrated angle

0.5 127

0.5 127

0.5 65

0.5 8

 

ms

ms

ms

ms

6,7

6,8

6,9

6, 10

Minimum “high” time before

trigger, text_hi

  250 ns 11
Minimum “low” time after trigger, text_lo   250 ns 11

Delay from external trigger to start of transmission, text_dl

Pull-Up Resistor

Latency

 

86

40 50

1000

µs

µs

11

TIME OF VALIDITY (TOV PIN)

Output configuration

VOH

 

 

VOL

TOV active level

Minimum time of TOV, ttov_min Delay from internal time-tick to TOV active, ttov_dl

Delay from TOV active (to start of transmission, ttx_dl

 

5V logic: IOH = - 10 µA

5V logic: IOH = - 100 µA 3.3V logic: IOH = - 10 µA 3.3V logic: IOH = - 100 µA IOL = 10 mA

Open drain with internal pull up

0.9 VSUP

0.7 VSUP

0.6 VSUP

0.47 VSUP

0.1

Active “low”

50

1.2 6

80

 

V

V

V

V

V

µs

µs

µs

 

12

12

12

12

 

13

13

13

CHASSIS

Isolation resistance chassis to GND (pin 15)

500VDC 100  

Note 1: Time from Power-On to start of datagram transmissions (starting with part-number datagram)

Note 2: Time from Reset release to start of datagram transmissions (starting with part-number datagram)

Note 3: Time from Power-On or Reset to the reset of the Start-Up bit (Bit 6 in the STATUS byte ref.Table 5-23). During this period the output data should be regarded as non-valid.

Note 4: If a user-defined bit-rate larger than 1.5Mbit/s is used, the deviation may exceed the specification due to the resolution of the bit-rate generator, ref. section9.13.1

Note 5: Other values can be configured, ref.Table 5-11

Note 6: If time between triggers is longer than 127ms, the sample counter will over-run

Note 7: Time between triggers should be carefully evaluated as long time between triggers in combination with high bandwidths could lead to issues related to folding. Similar for accelerometer and inclinometer outputs

Note 8: If time between triggers is longer than 8ms, an overload may occur in the incremental angle. An overload will be flagged in the status byte, ref.Table 5-23. Similar for accelerometer and inclinometer outputs

Note 9: If time between triggers is longer, the accuracy of average rate may also be reduced. Similar for accelerometer and inclinometer outputs

Note 10: If time between triggers is longer, the integrated angle may have wrapped several times and hence the

change in angle from last sample will not be possible to calculate. Similar for accelerometer and inclinometer

outputs

Note 11: For definition, ref.Figure 7-3

Note 12: Digital output level can be configured to 5V or 3.3V in SERVICEMODE (ref. section9.7) or when ordering (ref. section12)

Note 13: For definition, ref.Figure 7-4andFigure 7-5

 

Contact Details
Xi'an Kacise Optronics Co.,Ltd.

Contact Person: Ms. Evelyn Wang

Tel: +86 17719566736

Fax: 86--17719566736

Send your inquiry directly to us (0 / 3000)

Contact

Address: i City, No11, TangYan South road, Yanta District, Xi'an,Shaanxi,China.

Factory Address:i City, No11, TangYan South road, Yanta District, Xi'an,Shaanxi,China.