Data Sheet

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
device registers are read using I
2
C burst read mode. Therefore the internal storage of the auto-increment address is cleared whenever a
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