I have a problem with power consumption of LPC54618 RTC. As illustrated in attached PDF I have a board with the configuration visible on the schematic. Battery is a rechargeable Panasonic VL-1220 with 7mA/h current capacitance. LPC54618 datasheet reports that, in power off conditions (board off, with only VBAT present), consumption is 340nA. I can't measure precisely the consumption, but after several tests, I see that the current absorbed from RTC is more than that indicated. I tried to left reset pin floating ad suggested in the datasheet, but without significative differences (and how can I left floating a reset pin?!?!). I have 2 different boards with same LPC54618 RTC circuit and same problem.
Is there anyone that can help me to understand how solve this problem?
For information I used same battery on LPC1768 controller (that has similar consumption characteristics) without problems and duration about 6 months.
Many thanks in advance for any information.
Marco Di Biaggio