MMA8452Q

Sensors

Freescale Semiconductor, Inc.

19

Note: Auto-increment addresses which are not a simple increment are highlighted in bold. The auto-increment addressing is only enabled when

STOP condition is detected.

6.1

Data Registers

The following are the data registers for the MMA8452Q. For more information on data manipulation of the MMA8452Q, refer

to application note, AN4076.

PULSE_WIND(3)(4)

R/W

0x28

0x29

00000000

0x00

Window time for 2nd pulse

ASLP_COUNT(3)(4)

R/W

0x29

0x2A

00000000

0x00

Counter setting for Auto-SLEEP

CTRL_REG1(3)(4)

R/W

0x2A

0x2B

00000000

0x00

Data Rate, ACTIVE Mode

CTRL_REG2(3)(4)

R/W

0x2B

0x2C

00000000

0x00

Sleep Enable, OS Modes,

RST, ST

CTRL_REG3(3)(4)

R/W

0x2C

0x2D

00000000

0x00

Wake from Sleep, IPOL, PP_OD

CTRL_REG4(3)(4)

R/W

0x2D

0x2E

00000000

0x00

Interrupt enable register

CTRL_REG5(3)(4)

R/W

0x2E

0x2F

00000000

0x00

Interrupt pin (INT1/INT2) map

OFF_X(3)(4)

R/W

0x2F

0x30

00000000

0x00

X-axis offset adjust

OFF_Y(3)(4)

R/W

0x30

0x31

00000000

0x00

Y-axis offset adjust

OFF_Z(3)(4)

R/W

0x31

0x0D

00000000

0x00

Z-axis offset adjust

Reserved (do not modify)

0x40 – 7F

—

—

—

Reserved. Read return 0x00.

1. Register contents are reset when transition from STANDBY to ACTIVE mode occurs.

2. This register data is only valid in ACTIVE mode.

3. Register contents are preserved when transition from ACTIVE to STANDBY mode occurs.

4. Modification of this register’s contents can only occur when device is STANDBY mode except CTRL_REG1 ACTIVE bit and CTRL_REG2

RST bit.

0x00: STATUS Data Status Register (Read Only)

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

ZYXOW

ZOW

YOW

XOW

ZYXDR

ZDR

YDR

XDR

Table 12. STATUS Description

ZYXOW

X, Y, Z-axis Data Overwrite. Default value: 0

0: No data overwrite has occurred

1: Previous X, Y, or Z data was overwritten by new X, Y, or Z data before it was read

ZOW

Z-axis Data Overwrite. Default value: 0

0: No data overwrite has occurred

1: Previous Z-axis data was overwritten by new Z-axis data before it was read

YOW

Y-axis Data Overwrite. Default value: 0

0: No data overwrite has occurred

1: Previous Y-axis data was overwritten by new Y-axis data before it was read

XOW

X-axis Data Overwrite. Default value: 0

0: No data overwrite has occurred

1: Previous X-axis data was overwritten by new X-axis data before it was read

ZYXDR

X, Y, Z-axis new Data Ready. Default value: 0

0: No new set of data ready

1: A new set of data is ready

ZDR

Z-axis new Data Available. Default value: 0

0: No new Z-axis data is ready

1: A new Z-axis data is ready

YDR

Y-axis new Data Available. Default value: 0

0: No new Y-axis data ready

1: A new Y-axis data is ready

XDR

X-axis new Data Available. Default value: 0

0: No new X-axis data ready

1: A new X-axis data is ready

Table 11. Register Address Map