Why Lis2dh power consumption stays at 188uA even in Low power ?

Paul Pinault · ‎2018-06-14

Posted on June 14, 2018 at 21:38

Hello,

I do not understand why my LIS2DH stays at 188uA (basically the one in boot-up configuration) even if I configured it in Low-Power mode ?

Here is my configuration :

--LIS2DH Config---

CTRL_REG1 : 0x2F (ODR 10HZ / Low Power / All Axis enabled)

CTRL_REG2 : 0x0E (HP filter activated normal mode)

CTRL_REG3 : 0x00

CTRL_REG4 : 0x80 (BDU / scale 2G / High Res disabled)

CTRL_REG5 : 0x42 ( Fifo enable / INt2 enable)

CTRL_REG6 : 0x00

STATUS_REG : 0xFF

FIFO_CTRL_REG : 0x80

FIFO_SRC_REG : 0x20

INT1_CFG : 0x00

INT1_THS : 0x00

INT2_CFG : 0x2A

INT2_THS : 0x06

INT1_SRC : 0x00

INT2_SRC : 0x00

Help welcome.

Paul Pinault · ‎2018-06-14

Posted on June 14, 2018 at 22:11

IN fact the reason was SA0 connected to GND : it should be done for that but for real this is consuming a lot. Connecting it to VCC gives a normal consumption. I assume it is due to the non documented internal pull-up. This should be fixed thanks to the non documented CONG_REG0 ...