How to calculate LIS331HH wakeup threshold

[Abdelrahman_Elnahas]

Hello All,

I try to set threshold of INT1 in LIS331HH
According to the datasheet the sensitivity of the sensor can be set to(3 , 6 , 12)mg/digit
And the threshold register is 7-bit register

Can anyone confirm these calculations or there's another factor must be added to set the threshold :
Threshold(mg) = (Sensitivity) * (7-bit value)

For ex :
To set threshold to 1g . and set the sensitivity to 12mg/digit :
1000 mg = (12) * register value
register value = 1000/12 = 83

[Peter BENSCH]

I am extremely sorry to have to inform you that the LIS331HH accelerometers have long been discontinued and that STMicroelectronics no longer has any information about them. I am very sorry not to be able to give you more pleasant information.

But maybe there is another user who has used this sensor and can help you.

Regards
/Peter

[Ali9088]

To calculate the LIS331HH wakeup threshold, use this formula:

Threshold=THS×Sensitivity\text{Threshold} = \text{THS} \times \text{Sensitivity}Threshold=THS×Sensitivity

• THS = Value from the threshold register (0-127)
• Sensitivity = 12 mg/digit (for ±6g mode) or 48 mg/digit (for ±24g mode)

Example: If THS = 50 and using ±6g mode →

50×12=600 mg(0.6g)50 \times 12 = 600 \text{ mg} (0.6g)50×12=600 mg(0.6g)

Similar to KDV Hesaplama, where you set a minimum taxable amount, here, you set a minimum motion level for wake-up