FMT1000 Datasheet, PDF (19/29 Pages) Fairchild Semiconductor – Motion Tracking Module with Output of Orientation, Inertial Motion Data and Magnetic Field

4 Sensor Calibration
Each FMT is individually calibrated and tested over its temperature range. The (simplified) sensor model of the
gyroscopes, accelerometers and magnetometers can be represented as following:
s
= sensor data of the gyroscopes, accelerometers and magnetometers in rad/s, m/s² or a.u. respectively
KT-1 = gain and misalignment matrix (temperature compensated)
u
= sensor value before calibration (unsigned 16-bit integers from the sensor)
bT
= bias (temperature compensated)
Fairchild‟s calibration procedure calibrates for many parameters, including bias (offset), alignment of the sensors with
respect to the module PCB and each other and gain (scale factor). All calibration values are temperature dependent
and temperature calibrated. The calibration values are stored in non-volatile memory in the FMT1000-series.
5 System and Electrical Specifications
5.1 Interface Specifications
Table 12. Communication Interfaces
Interface
I²C
SPI
UART
Description
Host I²C interface speed
Host SPI Interface Speed
Clock Duty Sycle
Baud Rates
Min.
30
Typ.
50
921.6
Max.
400
2
70
4000
Units
kHz
MHz
%
kbps
Table 13. Auxiliary Interfaces
Interface
SYNC_IN
Description
VIL
VIH
VHYS
nRST
VIL
RPU
Generated reset
pulse duration
Min.
Max.
0.3 * VDDIO
0.45 * VDDIO + 0.3
0.45 * VDDIO + 0.3
0.3 * VDDIO
30
50
Unit
V
V
V
V
kΩ
Comments
Digital Input Voltage
Digital Input Voltage
Only drive
momentarily
Pull-up Resistor
20
µs
5.2 System Specifications
Table 14. System Specifications
Interface
Size
Weight
Description
Width/Length
Height
Temperature
Operating Temperature
Power Consumption
Timing Accuracy
Specified performance
Operating Temperature
Min.
12.0
2.45
-40
0
Typ.
12.1
2.55
0.66
44
10
Max.
12.2
2.65
+85
+60
Unit
mm
mm
gram
ºC
Comments
PLCC-28 Compatible
Ambient Temperature,
Non-Condensing
ºC
mW VDD 3.0 V; VDDIO 1.8 V
ppm
© 2015 Fairchild Semiconductor Corporation
FMT1000-series • Rev. 1.0
19
www.fairchildsemi.com