MMA8652FC datasheet(27/77 Pages) FREESCALE

27 / 77 page

MMA8652FC

Sensors

Freescale Semiconductor, Inc.

6.4.2

0x01: OUT_X_MSB, Accelerometer X-axis Data register

6.4.3

0x02: OUT_X_LSB, Accelerometer X-axis Data register

6.4.4

0x03: OUT_Y_MSB, Accelerometer Y-axis Data register

6.4.5

0x04: OUT_Y_LSB, Accelerometer Y-axis Data register

6.4.6

0x05: OUT_Z_MSB, Accelerometer Z-axis Data register

6.4.7

0x06: OUT_Z_LSB, Accelerometer Z-axis Data register

These registers contain the X-axis, Y-axis, and Z-axis12-bit output sample data (expressed as 2's complement numbers).

NOTE:

–

If the FIFO data output register driver is disabled, then the sample data output registers store the current

sample data.

–

If the FIFO data output register driver is enabled (F_MODE > 00), then the sample data output registers point

to the head of the FIFO buffer (Register 0x01 X_MSB), which contains the previous 32 X, Y, and Z data

samples.

•

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, to reduce reading the status followed by 12-bit axis data to 7 bytes. If the

F_READ bit is set (0x2A bit 1), then auto-increment will skip over LSB registers (to access the MSB data only). This will

shorten the data acquisition from 7 bytes to 4 bytes.

•

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.

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

XD11

XD10

XD9

XD8

XD7

XD6

XD5

XD4

Figure 16. 0x01 OUT_X_MSB: X_MSB register (Read-Only)

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

XD3

XD2

XD1

XD0

Figure 17. 0x02 OUT_X_LSB: X_LSB register (Read-Only)

Bit 7

Bit 6Bit 5Bit 4Bit 3Bit 2Bit 1Bit 0

YD11

YD10

YD9

YD8

YD7

YD6

YD5

YD4

Figure 18. 0x03 OUT_Y_MSB: Y_MSB register (Read-Only)

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

YD3

YD2

YD1

YD0

Figure 19. 0x04 OUT_Y_LSB: Y_LSB register (Read-Only)

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

ZD11

ZD10

ZD9

ZD8

ZD7

ZD6

ZD5

ZD4

Figure 20. 0x05 OUT_Z_MSB: Z_MSB register (Read-Only)

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

ZD3

ZD2

ZD1

ZD0

Figure 21. 0x06 OUT_Z_LSB: Z_LSB register (Read-Only)

MMA8652FC Datasheet(PDF) 27 Page - Freescale Semiconductor, Inc

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