MMA6281QR2 datasheet(3/12 Pages) FREESCALE

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Sensors

Freescale Semiconductor

MMA6281QT

Table 2. Operating Characteristics

Unless otherwise noted: –20°C < TA < 85°C, 2.2 V < VDD < 3.6 V, Acceleration = 0g, Loaded output(1)

Characteristic

Symbol

Min

Typ

Max

Unit

Operating Range(2)

Supply Voltage(3)

Supply Current

Supply Current at Sleep Mode(4)

Operating Temperature Range

Acceleration Range, X-Axis, Z-Axis

g-Select1 & 2: 00

g-Select1 & 2: 10

g-Select1 & 2: 01

g-Select1 & 2: 11

VDD

IDD

gFS

2.2

—

–40

—

3.3

500

—

±2.5

±3.3

±6.7

±10.0

3.6

800

+105

—

µA

°C

Output Signal

Zero-g (TA = 25°C, VDD = 3.3 V)(5)

Zero-g(4)

X-axis

Z-axis

Sensitivity (TA = 25°C, VDD = 3.3 V)

2.5g

3.3g

6.7g

10g

Sensitivity(4)

X-axis

Z-axis

Bandwidth Response

VOFF

VOFF, TA

S2.5g

S3.3g

S6.7g

S10g

S,TA

f-3dB

1.485

±2.6(6)

±1.0(6)

444

333

167

111

±0.02(6)

±0.01(6)

—

1.65

±0.6

±0.8

480

360

180

120

±0.02

±0.00

350

150

1.815

±3.8(7)

±0.8(7)

516

387

193

129

±0.02(7)

±0.01(7)

—

mg/°C

mV/g

%/°C

Noise

RMS (0.1 Hz – 1 kHz)(4)

Power Spectral Density RMS (0.1 Hz – 1 kHz)(4)

nRMS

nPSD

—

3.0

350

—

mVrms

µg/

Control Timing

Power-Up Response Time(8)

Enable Response Time(9)

Sensing Element Resonant Frequency

Internal Sampling Frequency

tRESPONSE

tENABLE

fGCELL

fCLK

—

1.0

0.5

6.0

3.4

2.0

—

kHz

Output Stage Performance

Full-Scale Output Range (IOUT = 30 µA)

VFSO

VSS+0.25

—

VDD–0.25

Nonlinearity, XOUT, ZOUT

NLOUT

–1.0

—

+1.0

%FSO

Cross-Axis Sensitivity(10)

VXZ

——

5.0

1. For a loaded output, the measurements are observed after an RC filter consisting of a 1.0 kΩ resistor and a 0.1 µF capacitor on VDD-GND.

2. These limits define the range of operation for which the part will meet specification.

3. Within the supply range of 2.2 and 3.6 V, the device operates as a fully calibrated linear accelerometer. Beyond these supply limits the device

may operate as a linear device but is not guaranteed to be in calibration.

4. This value is measured with g-Select in 2.5g mode.

5. The device can measure both + and – acceleration. With no input acceleration the output is at midsupply. For positive acceleration the output

will increase above VDD/2. For negative acceleration, the output will decrease below VDD/2.

6. These values represent the 10th percentile, not the minimum.

7. These values represent the 90th percentile, not the maximum.

8. The response time between 10% of full scale VDD input voltage and 90% of the final operating output voltage.

9. The response time between 10% of full scale Sleep Mode input voltage and 90% of the final operating output voltage.

10. A measure of the device’s ability to reject an acceleration applied 90° from the true axis of sensitivity.

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