± 2g / 4g / 8g / 16g Tri-axis Digital
Accelerometer Technical
Reference Manual
PART NUMBER:
KX132-1211
Rev. 1.0
31-Jul-2019
36 Thornwood Dr.
–
Ithaca, NY 14850
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–
All Rights Reserved
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Page
42
of
73
1.23 OUTPUT BUFFER REGISTERS (0x5E
– 0x63)
BUF_CNTL1
Read/write control register that controls the buffer sample threshold. This register is On-The-Fly (OTF) register and
can be written to while the KX132-1211
is enabled (PC1 bit in CNTL1 register is set to “1”) and the change will be
accepted with no interruption in the operation.
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
SMP_TH7 SMP_TH6 SMP_TH5 SMP_TH4 SMP_TH3 SMP_TH2 SMP_TH1 SMP_TH0
Reset Value
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
00000000
Address:
0x5E
SMP_TH[7:0] Sample Threshold
–
determines the number of samples that will trigger a watermark
interrupt or will be saved prior to a trigger event. When BRES=1, the maximum number of
samples is 86; when BRES=0, the maximum number of samples is 171. The minimum number
of samples must be greater than or equal to 2.
Buffer Model
Sample Function
Bypass
None
FIFO
Specifies how many buffer samples are needed to
trigger a watermark interrupt.
Stream
Specifies how many buffer samples are needed to
trigger a watermark interrupt.
Trigger
Specifies how many buffer samples before the trigger
event are retained in the buffer.
Table 15:
Sample Threshold Operation by Buffer Mode
