Can't achieve low power with PCA10028

[Lee Daniel Crocker]

I'm trying to measure absolute minimum power consumption of the chip using the PCA10028. I cut SB 9, and applied a very sensitive current measuring device to P22. I'm running the following code (no SD):

int main(void) {
    NRF_POWER->RAMON = POWER_RAMON_ONRAM0_RAM0On << POWER_RAMON_ONRAM0_Pos
                     | POWER_RAMON_ONRAM1_RAM1On << POWER_RAMON_ONRAM1_Pos
                     | POWER_RAMON_OFFRAM0_RAM0Off << POWER_RAMON_OFFRAM0_Pos
                     | POWER_RAMON_OFFRAM1_RAM1Off << POWER_RAMON_OFFRAM1_Pos;
    
    NRF_RADIO->TASKS_DISABLE = 1;
    NRF_POWER->TASKS_LOWPWR = 1;
    NRF_POWER->SYSTEMOFF = 1;
}

I'm consistently measuring 1.8 mA (that's milliamps--1000 times what the specsheet says I should be getting). I've read all the threads here, I'm pressing RESET (is there some other way I should be resetting the chip to get out of debug mode?), SYSTEMOFF mode says it powers down everything, so what am I missing?

Also, the signal I'm getting from the current measurement is jittery at about 3kHz. Is there maybe something on the board waking it up at that rate?

[Susheel Nuguru]

i am not sure if this would help, but i think there should be a while(1): in the end of the main function, else it will end up in hardfault handler.
Also i do not have the bitfield and product doc in hand, not sure what is going on with RAMON settings, are you switching it off or on? seems like your are doing both in one go?