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AN3393 датащи(PDF) 43 Page - STMicroelectronics

номер детали AN3393
подробное описание детали  This document is intended to provide information
PDF  103 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN3393 датащи(HTML) 43 Page - STMicroelectronics

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AN3393
State machine
103
independently. An interrupt is generated when the end state is reached or when some
specific command is performed.
Figure 4. State Machine in LIS3DSH
5.3
Signal block
Referring to Figure 5, while the measurement chain of LIS3DSH generates 16-bit wide data,
the state machine inputs can be selected between:
1.
8-bit wide acceleration data produced by LSB cutter.
2.
8-bit wide acceleration vector amplitude (V), calculated and filtered (if enabled).
5.3.1
LSB cutter
8-bit input data to the state machine are generated by dividing sensor output data by 256:
8-bit data = 16-bit data / 256.
Figure 5. Signal block
5.3.2
Vector calculation
Vector values (V) are in 8-bit format as well and their range is limited from -127 to +127.
Acceleration vector amplitude is only available inside the two state machines, but cannot be
read outside.
The vector value is calculated by means of an approximation formula:
AM14770V1



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