CMA3000-D0X Datasheet, PDF (14/35 Pages) VTI technologies – 3-axis accelerometer

CMA3000-D0X Series
Address: 05h
Register name: INT_STATUS, Interrupt status register
Bits
Mode
Initial
Value
Name Description
7:3
0h
Reserved
2
R
0
FFDET 1 – Free fall detected (i.e. 0 g acceleration)
0 – Free fall not detected
1:0
R
0h
MDET 00 – No motion detected
01 – Trigger on X-axis
10 – Trigger on Y-axis
11 – Trigger on Z-axis
Note: Contents of INT_STATUS [2:0] is set to '000' always after reading of this register.
Address: 06h
Register name: DOUTX, X-channel output register
Bits
Mode
Initial
Value
Name Description
7:0
R
0h
DOUTX See SPI data frame description for more info.
Address: 07h
Register name: DOUTY, Y-channel output register
Bits
Mode
Initial
Value
Name Description
7:0
R
0h
DOUTY See SPI data frame description for more info.
Address: 08h
Register name: DOUTZ, Z-channel output register
Bits
Mode
Initial
Value
Name Description
7:0
R
0h
DOUTZ See SPI data frame description for more info.
The bit level description for acceleration data from DOUTX ... DOUTZ registers is presented in
Table 4 below. The acceleration data is presented in 2's complement format. At 0 g acceleration
the output is ideally 0h.
Table 4. Bit level description in [mg] for acceleration registers of CMA3000-D01.
Range G_RANGE
Output sample
rate
B7
B6
B5
B4
B3
B2
2g
1
400 Hz, 100 Hz s 1142 571 286 143 71
B1
B0
36 1/56 = 18 mg
2g
1
40 Hz, 10 Hz s 4571 2286 1142 571 286 143 1/14 = 71 mg
8g
0
8g
0
s = sign bit
400 Hz, 100 Hz s 4571 2286 1142 571 286 143 1/14 = 71 mg
40 Hz, 10 Hz s 4571 2286 1142 571 286 143 1/14 = 71 mg
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