FAQs
cancel
Turn on suggestions
Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type.
Showing results for 
Search instead for 
Did you mean: 

Free-fall and motion detection simultaneously on LIS3DH

jgaldana
Associate II

‎2016-11-29 02:46 PM

Posted on November 29, 2016 at 23:46

Hi support,

We wonder if there is any register configuration that allow us to route the motion detection to the INT1 pin and the free-fall detection to the INT2 pin and both working at the same time? Both pins are routed/connected to our uP and we need to have these two features enabled and working at the same time.

Thanks in advance
Labels:
0 Kudos
1 REPLY 1
Miroslav BATEK
ST Employee

‎2016-12-06 02:48 AM

Posted on December 06, 2016 at 11:48

Yes, this configuration is possible.

You should enable interrupt generator (AOI1) on interrupt pin INT1 (CTRL_REG3 0x22h) and interrupt generator (AOI2) on interrupt pit INT2 (CTRL_REG6 0x25h).

Then configure interrupt generator according to you needs. Configuration of INT1 is described in the datasheet, check registers INT1_CFG, INT1_SRC, INT1_THS, INT1_DURATION. Below is the list of registers for INT2 which are not in the current version of the datasheet but will be published soon.

Please also check application note

http://www.st.com/resource/en/application_note/cd00290365.pdf

for details about free fall and wake-up interrupt configuration.

INT2_CFG (34h)

AOI -> AND/OR combination of interrupt events. Default value: 0

6D -> 6-direction detection function enabled. Default value: 0.

ZHIE ->Enable interrupt generation on Z high event. Default value: 0

ZLIE ->Enable interrupt generation on Z low event. Default value: 0

YHIE ->Enable interrupt generation on Y high event. Default value: 0

YLIE ->Enable interrupt generation on Y low event. Default value: 0

XHIE ->Enable interrupt generation on X high event. Default value: 0

XLIE ->Enable interrupt generation on X low event. Default value: 0

INT2_SRC (35h)

0-> do not change

IA->Interrupt active.

ZH->Z high. Default value: 0

ZL->Z low. Default value: 0

YH->Y high. Default value: 0

YL->Y low. Default value: 0

XH->X high. Default value: 0

XL->X low. Default value: 0

INT2_THS (36h)

THS[6:0] ->

1 LSb = 16 mg @ FS = 2 g

1 LSb = 32 mg @ FS = 4 g

1 LSb = 62 mg @ FS = 8 g

1 LSb = 186 mg @ FS = 16 g

INT2_DURATION (37h)

D[6:0] 1 LSb = 1/ODR (Duration time is measured in N/ODR, where N is the content of the duration register.)

0 Kudos
Top