Hi,
Platform: iMX51
PMIC: MC13892
Recently the power consumption when powered by backup battery is too high, the current is about 1mA. Even I disable the VSRTC power supply, the current is still about 100uA. But the current I measure in iMX51 demo board is about 20uA. So I need to ask what internal modules in MC13892 are still powered by backup battery when the main power is dropped? As I know the MC13892 RTC, the core circuit and the backup memory are powered, any other modules? If no more modules how can I reduce the power consumption of these modules. Thank you.
已解决! 转到解答。
It needs to do test to confirm this issue. We have verified that our EVK board has no such issue, so customer should do comparison based on our hardware design. I have no other comment on this issue.
Regards, Linda
In RTC mode, MC13892's power consumption is around uA, as it is just 32K works. Is your hardware design different with our reference design? Please compare the HW design and software.
Thank you for your reply, I disabled the 32K output already, also disabled the SRTC power supply (by resetting DRM bit). Now I even disable MC13892 RTC by setting RTCDIS bit, the current is still high.
Can you help me to check which regulators or other modules can consume the power from backup battery?
My board is designed following the ref board. I am trying to compare the differences, can you give me some specific tips? Thanks again.
I've confirmed no power leakage in my board theoretically by analyzing the HW design. The second step I need to confirm all the modules are disabled. If still get high current it must be some physical reasons.
It needs to do test to confirm this issue. We have verified that our EVK board has no such issue, so customer should do comparison based on our hardware design. I have no other comment on this issue.
Regards, Linda