Datasheet

Sensors
NXP Semiconductors 45
MMA8452Q
18 FF_MT_COUNT
Freefall/Motion
Debounce R/W
D7 D6 D5 D4 D3 D2 D1 D0
1D TRANSIENT_CFG Transient Config R/W 0 0 0 ELE ZTEFE YTEFE XTEFE HPF_BYP
1E TRANSIENT_SRC Transient Source R 0 EA ZTRANSE Z_Trans_Pol YTRANSE Y_Trans_Pol XTRANSE X_Trans_Pol
1F TRANSIENT_THS Transient threshold R/W DBCNTM THS6 THS5 THS4 THS3 THS2 THS1 THS0
20 TRANSIENT_COUNT
Transient Debounce
R/W
D7 D6 D5 D4 D3 D2 D1 D0
21 PULSE_CFG Pulse Config R/W DPA ELE ZDPEFE ZSPEFE YDPEFE YSPEFE XDPEFE XSPEFE
22 PULSE_SRC Pulse Source R EA AxZ AxY AxX DPE Pol_Z Pol_Y Pol_X
23 PULSE_THSX Pulse X Threshold R/W 0 THSX6 THSX5 THSX4 THSX3 THSX2 THSX1 THSX0
24 PULSE_THSY Pulse Y Threshold R/W 0 THSY6 THSY5 THSY4 THSY3 THSY2 THSY1 THSY0
25 PULSE_THSZ Pulse Z Threshold R/W 0 THSZ6 THSZ5 THSZ4 THSZ3 THSZ2 THSZ1 THSZ0
26 PULSE_TMLT Pulse First Timer R/W TMLT7 TMLT6 TMLT5 TMLT4 TMLT3 TMLT2 TMLT1 TMLT0
27 PULSE_LTCY Pulse Latency R/W LTCY7 LTCY6 LTCY5 LTCY4 LTCY3 LTCY2 LTCY1 LTCY0
28 PULSE_WIND
Pulse 2nd Window
R/W
WIND7 WIND6 WIND5 WIND4 WIND3 WIND2 WIND1 WIND0
29 ASLP_COUNT
Auto-sleep Counter
R/W
D7 D6 D5 D4 D3 D2 D1 D0
2A CTRL_REG1 Control Reg1 R/W ASLP_RATE1 ASLP_RATE0 DR2 DR1 DR0 LNOISE F_READ ACTIVE
2B CTRL_REG2 Control Reg2 R/W ST RST 0 SMODS1 SMODS0 SLPE MODS1 MODS0
2C CTRL_REG3
Control Reg3
(wake Interrupts from
sleep) R/W
0 WAKE_TRANS WAKE_LNDPRT WAKE_PULSE WAKE_FF_MT 0 IPOL PP_OD
2D CTRL_REG4
Control Reg4
(Interrupt Enable Map)
R/W
INT_EN_ASLP 0 INT_EN_TRANS INT_EN_LNDPRT INT_EN_PULSE INT_EN_FF_MT 0 INT_EN_DRDY
2E CTRL_REG5
Control Reg5
(Interrupt Configuration)
R/W
INT_CFG_ASLP 0 INT_CFG_TRANS
INT_CFG_LNDPR
T
INT_CFG_PULSE INT_CFG_FF_MT 0 INT_CFG_DRDY
2F OFF_X X 8-bit offset R/W D7 D6 D5 D4 D3 D2 D1 D0
30 OFF_Y Y 8-bit offset R/W D7 D6 D5 D4 D3 D2 D1 D0
31 OFF_Z Z 8-bit offset R/W D7 D6 D5 D4 D3 D2 D1 D0
Table 67. Accelerometer output data
12-bit data Range ±2 g (1 mg) Range ±4 g (2 mg) Range ±8 g (3.9 mg)
0111 1111 1111 1.999 g +3.998 g +7.996 g
0111 1111 1110 1.998 g +3.996 g +7.992 g
…… … …
0000 0000 0001 0.001 g +0.002 g +0.004 g
0000 0000 0000 0.0000 g 0.0000 g 0.0000 g
1111 1111 1111 –0.001 g –0.002 g –0.004 g
…… … …
1000 0000 0001 –1.999 g –3.998 g –7.996 g
1000 0000 0000 –2.0000 g –4.0000 g –8.0000 g
8-bit data Range ±2 g (15.6 mg) Range ±4 g (31.25 mg) Range ±8 g (62.5 mg)
0111 1111 1.9844 g +3.9688 g +7.9375 g
0111 1110 1.9688 g +3.9375 g +7.8750 g
…… … …
Table 66. MMA8452Q register map (continued)
Reg Name Definition Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0