STM32L073RZ-Nucleo stop mode

[guo sir]

Posted on November 28, 2017 at 06:54

I tried STM32L073RZ-Nucleo. and use 'en.stm32cubel0\STM32Cube_FW_L0_V1.10.0\Projects\STM32L073RZ-Nucleo\Examples\PWR\PWR_STOP_RTCâ€�  but

I got a strange question:  first time enter stop mode ,current is 1.2uA ,RTC wake up cpu ,the second time enter stop mode current is 2.6uA. and every time since then is 2.6uA . is this a bug?

[Joseph Chan]

Posted on March 16, 2018 at 18:32

I have observed the same issue as the original poster. I use the example project from STM32Cube_FW_L0_V1.10.0,  PWR\PWR_STOP_RTC on STM32L073RZ-NUCLEO board, measure the current through JP6 (IDD). After powers up, first stop mode current is about 1.3µA (expected), subsequent stop more current is always 2.8µA (unexpected).

I thought maybe some external hardware draws the current. I try another example PWR\PWR_STOP. Every time, the stop mode current is 0.7µA as expected. 

It seems some RTC operation is drawing more than expected current.