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4.6
Initialization SPI Response
The first data transmitted by the device following reset is the SPI Error response shown in Table 30 . This ensures that an un-
expected reset will always be detectable. The device will respond to all acceleration data requests with the “Invalid Acceleration
Data Request” response until the DEVRES bit in the DEVSTAT register is cleared via a read of the DEVSTAT register. The arming
function will not be updated on Acceleration Data Request commands until the DEVRES bit in the DEVSTAT register is cleared.
4.7
Acceleration Data Representation
Acceleration values are determined from the 12-bit digital output (DV) using the following equations:
Acceleration = Sensitivity LSB × DV
For Signed Data
Acceleration = Sensitivity
LSB
× ( DV – 2048 )
For Unsigned Data
The linear range of digital values for signed data is -1920 to +1920, and for unsigned data is 128 to 3968. Resulting ranges
and some nominal acceleration values are shown in the following table.
Table 31. Nominal Acceleration Data Values
Nominal Acceleration
Unsigned Digital Value
Signed Digital Value
105g
120g
3969 - 4095
1921 - 2047
Unused
Unused
3968
3967
?
?
?
2050
2049
2048
2047
2046
?
?
?
129
128
1 - 127
0
1920
1919
?
?
?
2
1
0
-1
-2
?
?
?
-1919
-1920
-1921 - 2048
0
105.49
105.44
?
?
?
0.1099
0.0545
0
-0.0545
-0.1099
?
?
?
-105.44
-105.49
Unused
Fault
g
g
?
?
?
g
g
g
g
g
?
?
?
g
g
120.00
119.94
?
?
?
0.1250
0.0625
0
-0.0625
-0.1250
?
?
?
-119.94
-120.00
Unused
Fault
g
g
?
?
?
g
g
g
g
g
?
?
?
g
g
MMA655x
Sensor
50
Freescale Semiconductor, Inc.
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