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MMA8491Q Datasheet(PDF) 18 Page - Freescale Semiconductor, Inc

Part No. MMA8491Q
Description  Xtrinsic MMA8491Q 3-Axis Multifunction Digital Accelerometer
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Maker  FREESCALE [Freescale Semiconductor, Inc]
Homepage  http://www.freescale.com
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MMA8491Q Datasheet(HTML) 18 Page - Freescale Semiconductor, Inc

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MMA8491Q
Sensors
18
Freescale Semiconductor, Inc.
5.3.2
Accelerometer data registers (0x01–0x06)
These registers contain the X-axis, Y-axis, and Z-axis14-bit output sample data (expressed as 2's complement numbers).
OUT_X_MSB, OUT_X_LSB, OUT_Y_MSB, OUT_Y_LSB, OUT_Z_MSB, and OUT_Z_LSB are stored in the auto-
incrementing address range of 0x01 – 0x06.
The LSB registers can only be read immediately following the read access of the corresponding MSB register.
A random read access to the LSB registers is not possible.
Reading the MSB register and then the LSB register in sequence ensures that both bytes (LSB and MSB) belong to the same
data sample, even if a new data sample arrives between reading the MSB and the LSB byte.
The accelerometer data registers should be read only after the status register has confirmed that new data on all axes is
available.
5.4
Accelerometer output conversion
Table 13. OUT_X_MSB: X_MSB register (0x01, Read-only)
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
XD[13:7]
Table 14. OUT_X_LSB: X_LSB register (0x02, Read-only)
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
XD[5:0]
0
0
Table 15. OUT_Y_MSB: Y_MSB register (0x03, Read-only)
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
YD[13:6]
Table 16. OUT_Y_LSB: Y_LSB register (0x04, Read-only)
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
YD[5:0]
0
0
Table 17. OUT_Z_MSB: Z_MSB register (0x05, Read-only)
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
ZD[13:6]
Table 18. OUT_Z_LSB: Z_LSB register (0x06, Read-only)
Bit 7Bit 6Bit 5Bit 4Bit 3Bit 2Bit 1Bit 0
ZD[5:0]
0
0
Table 19. Accelerometer output data
14-bit Data
Range ±8g
(1 mg/count)
01 1111 1111 1111
+8.000g
01 1111 1111 1110
+7.998g
...
00 0000 0000 0000
0.000g
11 1111 1111 1111
-0.001g
...
...
10 0000 0000 0001
-7.998g
10 0000 0000 0000
-8.000g


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