MMA8451Q

Sensors

6

Freescale Semiconductor, Inc.

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

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

FS[1:0] set to 00

2g Mode

FS

±2

g

FS[1:0] set to 01

4g Mode

±4

FS[1:0] set to 10

8g Mode

±8

Sensitivity

FS[1:0] set to 00

2g Mode

So

4096

counts/g

FS[1:0] set to 01

4g Mode

2048

FS[1:0] set to 10

8g Mode

1024

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.

Soa

±2.64

%

Sensitivity Change vs. Temperature

FS[1:0] set to 00

2g Mode

TCSo

±0.008

%/°C

FS[1:0] set to 01

4g Mode

FS[1:0] set to 10

8g Mode

3. Before board mount.

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

TyOff

±17

mg

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

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

X

Y

Z

5. Self-Test is one direction only.

FS[1:0] set to 0

4g Mode

Vst

+181

+255

+1680

LSB

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

Normal Mode ODR = 400 Hz

Noise

99

µg/

√Hz

Operating Temperature Range

Top

-40

+85

°C