MMA8451Q Просмотр технического описания (PDF) - Freescale Semiconductor

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MMA8451Q

3-Axis, 14-bit/8-bit Digital Accelerometer

Freescale Semiconductor 

2

Mechanical and Electrical Specifications

2.1 Mechanical Characteristics

Table 2. Mechanical Characteristics @ VDD = 2.5V, VDDIO = 1.8V, T = 25°C unless otherwise noted.

Parameter

Test Conditions

Symbol Min Typ Max

Unit

FS[1:0] set to 00

±2

2g Mode

Measurement Range(1)

FS[1:0] set to 01

FS

±4

g

4g Mode

FS[1:0] set to 10

±8

8g Mode

FS[1:0] set to 00

2g Mode

4096

Sensitivity

FS[1:0] set to 01

So

4g Mode

2048

counts/g

FS[1:0] set to 10

8g Mode

1024

Sensitivity Accuracy(2)

Soa

±2.64

%

FS[1:0] set to 00

2g Mode

Sensitivity Change vs. Temperature

FS[1:0] set to 01

4g Mode

TCSo

±0.008

%/°C

FS[1:0] set to 10

8g Mode

Zero-g Level Offset Accuracy(3)

FS[1:0] 2g, 4g, 8g

TyOff

±17

mg

Zero-g Level Offset Accuracy Post Board Mount(4)

FS[1:0] 2g, 4g, 8g

TyOffPBM

±20

mg

Zero-g Level Change vs. Temperature

-40°C to 85°C

TCOff

±0.15

mg/°C

Self-Test Output Change(5)

X

Y

Z

FS[1:0] set to 0

Vst

4g Mode

+181

LSB

+255

+1680

ODR Accuracy

2 MHz Clock

%

±2

Output Data Bandwidth

BW

ODR/3

ODR/2 Hz

Output Noise

Normal Mode ODR = 400 Hz Noise

126

µg/√Hz

Output Noise Low Noise Mode(1)

Normal Mode ODR = 400 Hz Noise

99

µg/√Hz

Operating Temperature Range

Top

-40

+85

°C

1. Dynamic Range is limited to 4g when the Low Noise bit in Register 0x2A, bit 2 is set.

2. Sensitivity remains in spec as stated, but changing Oversampling mode to Low Power causes 3% sensitivity shift. This behavior is also seen

when changing from 800 Hz to any other data rate in the Normal, Low Noise + Low Power or High Resolution mode.

3. Before board mount.

4. Post Board Mount Offset Specifications are based on an 8 Layer PCB, relative to 25°C.

5. Self-Test is one direction only.

MMA8451Q

6

Sensors

Freescale Semiconductor, Inc.

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