Data Sheet

MMA8452Q
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
Measurement Range
(1)
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
1024
counts/g
FS[1:0] set to 01
4g Mode
512
FS[1:0] set to 10
8g Mode
256
Sensitivity Accuracy
(2)
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
Zero-g Level Offset Accuracy
(3)
3. Before board mount.
FS[1:0] 2g, 4g, 8g TyOff ±17 mg
Zero-g Level Offset Accuracy Post Board Mount
(4)
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
Self-Test Output Change
(5)
X
Y
Z
5. Self-Test is one direction only.
FS[1:0] set to 0
4g Mode
Vst
+44
+61
+392
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
Output Noise Low-Noise Mode
(1)
Normal Mode ODR = 400 Hz Noise 99 µg/√Hz
Operating Temperature Range Top -40 +85 °C