FXOS8700CQ datasheet(10/86 Pages) FREESCALE

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Sensors

Freescale Semiconductor, Inc.

4.2

Magnetic characteristics (magnetometer)

Table 3. Magnetic characteristics @ VDD = 2.5V, VDDIO = 1.8V T = 25°C unless otherwise noted.

Symbol

Parameter

Test Conditions

Min

Typ

Max

Unit

Measurement range

±1200

μT

Sensitivity

0.1

μT/LSB

Sensitivity change versus temperature

±0.1

%/°C

Zero-flux offset accuracy(1)

1. After m-cell has been trimmed.

±1

μT

Tco

Zero-flux offset change with temperature

0.8 (XY)

2.4 (Z)

μT/°C

Hysteresis(2)

2. Hysteresis is measured by sweeping the applied magnetic field from -1500

μT to 1500 μT and then back to -1500 μT. The difference in the

two readings at -1500

μT divided by the swept field range is the hysteresis figure, expressed in % of the full-scale range (FS).

±1

%FS

Nonlinearity(3)

Best-fit straight line

3. Over a ±300

μT sliding window within the full-scale range.

TBD

%FS

Temperature sensor repeatability(4)

4. Verified by characterization.

1°C

Temperature sensor sensitivity

0.96

°C/LSB

Noise

Magnetometer output noise

ODR = 800 Hz, OS = 2

1.7 (XY)

2.5 (Z)

μT/rms

ODR = 400 Hz, OS = 4

1.2 (XY)

1.8 (Z)

ODR = 200 Hz, OS = 8

0.85 (XY)

1.3 (Z)

ODR = 100 Hz, OS = 16

0.6 (XY)

0.9 (Z)

ODR = 50 Hz, OS = 32

0.42 (XY)

0.6 (Z)

ODR = 12.5 Hz, OS = 128

0.3 (XY)

0.44 (Z)

ODR = 6.25 Hz, OS = 256

0.23 (XY)

0.33 (Z)

ODR = 1.56 Hz, OS = 1024

0.21 (XY)

0.3 (Z)

Vst

Self-Test output change

(1)

X-axis

-1320

TBD

LSB

Y-axis

+1300

TBD

LSB

Z-axis

100

TBD

LSB

Output data bandwidth

ODR/3

ODR/2

Top

Operating temperature range

-40

+85

°C

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