NSFK datasheet(21/39 Pages) NXP

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Mechanical and electrical specifications

NXP Sensor Fusion Library for Kinetis MCUs, Rev. 0.8

NXP B.V.

The currents in Table 9 were measured using a FreeRTOS-based project with sampling rates similar to

the above, but with the addition of separate 40 Hz fusion and 200 Hz sensor sampling task to the

RTOS-based project. The project is designed to shut down the gyro when no motion is detected by the

accelerometer. Measured current includes IDD for FXOS8700CQ, FXAS21002 and dual 4.7K I2C

pullup resistors on the board.

Table 9. Typical Current Draw on AGM01 Sensor Board

Function

Measured IDD P3V3 (mA)

Run Mode

3.4

Gyro Standby Mode

0.7

4.6 Computation metrics

The Sensor Fusion Library computations are measured directly using the Sensor Fusion Toolbox and

the ARM® sysTick clock, using the configuration outlined in the previous section.

4.6.1 Statistics from version 7.00 of the Sensor Fusion Library

NXP used the built-in sysTick counter to measure each iteration of the fusion algorithms in units of CPU

clock cycles.

The customer can repeat the exact same measurement, because both PC and Android Sensor Fusion

Toolboxes display this information in a real-time basis. The test results may vary, depending on device

movement, as presented numbers are typical.

Table 10. K SysTick values for Freedom development platforms and sensor combinations1

Freedom Platform

Accel

2D Mag

Gyro

eCompass

Accel

+Gyro

9-axis

FRDM-K22F

2.7

2.1

3.6

46.7

FRDM-K64F

2.6

1.9

3.5

12.7

42.8

Based on “All Motions” build, which includes tilt, 2D automotive compass, rotation, eCompass, 6- and 9-axis

Kalman filters. Does not include pressure/altimeter.

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