KX022-1020 Datasheet, PDF (54/75 Pages) List of Unclassifed Manufacturers – Accelerometer Specifications

± 2g / 4g / 8g Tri-axis Digital
Accelerometer Specifications
PART NUMBER:
KX022-1020
Rev. 11.0
10-Sep-15
BUF_CNTL2
Read/write control register that controls sample buffer operation. Note that to properly change the
value of this register, the PC1 bit in CTRL_REG1 must first be set to “0”.
R/W
BUFE
Bit7
R/W
R/W
R/W
R/W
R/W
R/W
R/W
BRES
BFIE
0
0
0
BUF_M1 BUF_M0 Reset Value
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
00000000
I²C Address: 0x3Bh
BUFE controls activation of the sample buffer.
BUFE = 0 – sample buffer inactive
BUFE = 1 – sample buffer active
BRES 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 – 16-bit samples are accumulated in the buffer
BFIE buffer full interrupt enable bit
BFIE = 0 – buffer full interrupt disabled
BFIE = 1 – buffer full interrupt updated in INS2
BUF_M1, BUF_M0 selects the operating mode of the sample buffer per Table 23.
BUF_M1 BUF_M0
0
0
0
1
1
0
1
1
Mode
Description
The buffer collects 84 sets of 8-bit low resolution values or 41
FIFO sets of 16-bit 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
Stream or 41 sets of 16-bit 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
Trigger
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 16-bit high resolution values. Once the buffer is
FILO 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 23: Selected Buffer Mode
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