KXTI9-1001 Datasheet, PDF (35/54 Pages) List of Unclassifed Manufacturers – 2g/4g/8g Tri-axis Digital Accelerometer Specifications

± 2g / 4g / 8g Tri-axis Digital
Accelerometer Specifications
PART NUMBER:
KXTI9-1001
Rev. 2
Jul-2011
BUF_CTRL2
Read/write control register that controls sample buffer operation.
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
BUFE BUF_RES 0
0
0
0
BUF_M1 BUF_M0
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
I²C Address: 0x33h
Reset Value
00000000
BUFE controls activation of the sample buffer.
BUFE = 0 – sample buffer inactive
BUFE = 1 – sample buffer active
BUF_RES determines the resolution of the acceleration data samples collected by the sample
buffer.
BUF_RES = 0 – 8-bit samples are accumulated in the buffer
BUF_RES = 1 – 12-bit samples are accumulated in the buffer
BUF_M1, BUF_M0 selects the operating mode of the sample buffer per Table 22.
BUF_M1 BUF_M0
0
0
0
1
1
0
1
1
Mode
FIFO
Stream
Trigger
FILO
Description
The buffer collects 84 sets of 8-bit low resolution values or 41
sets of 12bit high resolution values and then stops collecting
data, collecting new data only when the buffer is not full.
The buffer holds the last 84 sets of 8-bit low resolution values
or 41 sets of 12bit high resolution values. Once the buffer is
full, the oldest data is discarded to make room for newer
data.
When a trigger event occurs, the buffer holds the last data
set of SMP[6:0] samples before the trigger event and then
continues to collect data until full. New data is collected only
when the buffer is not full.
The buffer holds the last 84 sets of 8-bit low resolution values
or 41 sets of 12bit high resolution values. Once the buffer is
full, the oldest data is discarded to make room for newer
data. Reading from the buffer in this mode will return the
most recent data first.
Table 22. Selected Buffer Mode
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