AN4504 datasheet(23/41 Pages) STMICROELECTRONICS

Part #	AN4504

Description	This document is intended to provide usage information

PDF	41 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

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AN4504

Interrupt generation

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

AN4504 Datasheet(PDF) 23 Page - STMicroelectronics