CMA3000-D0X Series
Address: 05h
Register name: INT_STATUS, Interrupt status register
Initial
Value
0h
Bits
Mode
Name
Description
7:3
2
Reserved
R
R
0
FFDET
MDET
1 – Free fall detected (i.e. 0 g acceleration)
0 – Free fall not detected
00 – No motion detected
01 – Trigger on X-axis
1:0
0h
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
Initial
Value
0h
Bits
7:0
Mode
R
Name
Description
DOUTX
See SPI data frame description for more info.
Address: 07h
Register name: DOUTY, Y-channel output register
Initial
Value
0h
Bits
7:0
Mode
R
Name
Description
DOUTY
See SPI data frame description for more info.
Address: 08h
Register name: DOUTZ, Z-channel output register
Initial
Value
0h
Bits
7:0
Mode
R
Name
Description
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.
Output sample
Range G_RANGE
B7 B6
B5
B4
B3
B2
B1
B0
rate
2g
2g
8g
1
1
0
0
400 Hz, 100 Hz
40 Hz, 10 Hz
400 Hz, 100 Hz
40 Hz, 10 Hz
s
s
s
s
1142 571 286 143
4571 2286 1142 571 286 143 1/14 = 71 mg
4571 2286 1142 571 286 143 1/14 = 71 mg
4571 2286 1142 571 286 143 1/14 = 71 mg
71
36 1/56 = 18 mg
8g
s = sign bit
VTI Technologies Oy
www.vti.fi
14/ 35
Doc.Nr. 8281000.12
Rev. 0.12
VTI [ VTI TECHNOLOGIES ]
