I use are LPCXpresso54S018M EVB. I need the RTC in the LPC54018 to work after the main power supply is removed. I initialized and enabled the RTC in my firmware. I powered the VBATT line (J10:11) with a coin cell battery CR2032. While the main power is present, the VBATT line consumption is == 0. It's Ok. However, after removing the main power supply, the VBATT line consumption increases up to ~41 uA! According to the datasheet, consumption should be less than 1 uA. Why? How can I achieve current consumption of 1 µA or less?
