This may wind up being a "SAMB11 Xplained Pro" hardware question instead of a "SAMB11 module" question, but here goes:
In modeling some stuff we're doing on a custom board that involves powering off the SAMB11 at certain times (with an LP38693) on a SAMB11 Xplained Pro by switching its power off with a relay, I discovered that the chip seems to draw enough power through the peripherals I have connected to continue to run! This is not an ideal situation, but I looked at the datasheet (such as it is) and it seemed like I should be able to get it to power off by holding CHIP_EN low. Since nothing exposes CHIP_EN on that board explicitly, I soldered to the RST pad on the back (which is at 3.3V while everything is running), but pulling it to GND does not seem to shut the chip down. (I also tried accessing it via the nRESET pin on the SWD header, but I don't even see 3.3V there)
- does anyone know if CHIP_EN is actually exposed on the RST pad (on the back of the board, seems to be a set of JTAG related pads)?
- should pulling CHIP_EN to GND actually force the board to power down? I can try soldering directly to pin 22 of the SAMB11 module and try again (though that looks pretty tricky).