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2171808_en-US
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Hello,
we've an RT1176 on custom hardware and use the internal RTC in SNVS domain. I've managed to get current consumption to 3,8uA when putting MCU in SNVS mode. So the system will go into SNVS mode by setting TOP bit in LPCR register when power fail occurs. But afterwards the system won't power on due to PMIC_ON_REQ is held low. Actual I keep all but instead of setting TOP bit the systen stuck in while loop until power supply shut down. In this state the current consumption from coin cell is 3,8uA and all is fine. But without setting TOP bit in LPCR I'm not sure if the MCU is in SNVS mode so I'm not sure if there will be any unwanted behavior and my system will drain my coin cell. Can someone clarify in which state the MCU will be? I'm not configure any setpoint or another energy mode. just power down all except VDD_SNVS_IN.
Another hint just for anyone trying to mesaure RTC consumption. When debugger is connected (we're using Segger JLink) the current will increase to ~60uA.
Best Regards
SNVS mode is the state where all power domains are off with the exception of SNVS. To access SNVS either you press the ON/OFF for more than five seconds or set the TOP bit. If you don’t do any of these then the system will not be on SNVS. If you don't set TOP and everything is off except SNVS mode, it still is SNVS mode.
BR,
Omar