Sensors

Freescale Semiconductor

25

MMA7455L

Signed byte data (2’s complement): User level offset trim value for Z-axis

*Bit weight is for 2g 8-bit data output. Typical value for reference only. Variation is specified in “Electrical Characteristics” section.

Signed byte data (2’s complement): User level offset trim value for Z-axis

*Bit weight is for 2g 8-bit data output. Typical value for reference only. Variation is specified in “Electrical Characteristics” section.

GLVL [1:0]

00: 8g is selected for measurement range.

10: 4g is selected for measurement range.

01: 2g is selected for measurement range.

STON

0: Self-test is not enabled

1: Self-test is enabled

MODE [1:0]

00: Standby Mode

01: Measurement Mode

10: Level Detection Mode

11: Pulse Detection Mode

SPI3W

0: SPI is 4 wire mode

1: SPI is 3 wire mode

DRPD

0: Data ready status is output to INT1/DRDY PIN

1: Data ready status is not output to INT1/DRDY PIN

$14: Offset Drift Z LSB (Read/Write)

D7

D6

D5

D4

D3

D2

D1

D0

Bit

ZOFF[7]

ZOFF[6]

ZOFF[5]

ZOFF[4]

ZOFF[3]

ZOFF[2]

ZOFF[1]

ZOFF[0]

Function

0

0

0

0

0

0

0

0

Default

Bit

ZOFF[7]

ZOFF[6]

ZOFF[5]

ZOFF[4]

ZOFF[3]

ZOFF[2]

ZOFF[1]

ZOFF[0]

Weight*

64 LSB

32 LSB

16 LSB

8 LSB

4 LSB

2 LSB

1 LSB

0.5 LSB

$15: Offset Drift Z MSB (Read/Write)

D7

D6

D5

D4

D3

D2

D1

D0

Bit

--

--

--

--

--

ZOFF[10]

ZOFF[9]

ZOFF[8]

Function

0

0

0

0

0

0

0

0

Default

Bit

ZOFF[10]

ZOFF[9]

ZOFF[8]

Weight*

Polarity

256 LSB

128 LSB

$16: Mode Control Register (Read/Write)

D7

D6

D5

D4

D3

D2

D1

D0

Bit

--

DRPD

SPI3W

STON

GLVL[1]

GLVL[0]

MODE[1]

MODE[0]

Function

0

0

0

0

0

0

0

0

Default

Table 10. Configuring the g-Select for 8-bit output using Register $16 with GLVL[1:0] bits

GLVL [1:0]

g-Range

Sensitivity

00

8g

16 LSB/g

01

2g

64 LSB/g

10

4g

32 LSB/g

Table 11. Configuring the Mode using Register $16 with MODE[1:0] bits

MODE [1:0]

Function

00

Standby Mode

01

Measurement Mode

10

Level Detection Mode

11

Pulse Detection Mode