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AN4504 Fiches technique(PDF) 23 Page - STMicroelectronics

No de pièce AN4504
Description  This document is intended to provide usage information
PDF  41 Pages
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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN4504 Fiches technique(HTML) 23 Page - STMicroelectronics

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AN4504
Interrupt generation
41
The threshold module which is used by the system to detect any no-move or wake-up event
is defined by the INT1_THS register. The threshold value is expressed over 7 bits as an
unsigned number and is symmetrical around the zero-g level. XH (YH, ZH) is true when the
unsigned angular rate value of the X (Y, Z) channel is higher than INT1_THS. Similarly, XL
(YL, ZL) low is true when the unsigned angular rate value of the X (Y, Z) channel is lower
than INT1_THS. Refer to Figure 10 for more details.
Figure 10. NM_WU_CFG high and low
5.5.1
Wake-up
Wake-up interrupt refers to a specific configuration of the INT1_CFG register that allows
interrupt generation when the angular rate on the configured axis exceeds a defined
threshold (Figure 11).
Figure 11. Wake-up interrupt



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