AN3393 datasheet(43/103 Pages) STMICROELECTRONICS

部品番号	AN3393

部品情報	This document is intended to provide information

PDF	103 Pages

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メーカー	STMICROELECTRONICS [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:

8-bit wide acceleration data produced by LSB cutter.

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

AN3393 データシート(PDF) 43 Page - STMicroelectronics