What are the limitations on drawing current from the nRF52840 VDD pins? Are there continuous and transient limits on how much current can be drawn?
We are powering peripherals from these pins and we haven't had any problems if they are directly connected. This has been very solid on a previous design that went to production.
But now we are attempting to add a load switch to allow the peripherals to be powered down. When we turn on the load switch, the processor resets as if a current limit was exceeded and something internal to the chip detected it and caused a reset. I've tried setting the regulators to both LDO and DC/DC mode.
While testing, I am using either a power supply with a current limit set to 0.15 mA or the PPK2. I haven't seen the current limit trip on the power supply, but I can't rule out that it could be doing so very briefly.
I've looked at the datasheet for something that could be causing the reset and I haven't found anything. Is there something I'm missing?
