Hello Nordic team,
We have developed a smart tag using the NRF52810. We are looking at using it in asset monitoring application.
It is powered by 2x cr2032 in parallel.
1. Have your customers been able to power the nrf52 via cr2032 coin cell in freezing temperatures (-10 deg C)? Is there a better coin cell for this application.
2. what would be a good capacitor size to ensure brown outs do not happen, given that BLE adverts take (~10ma for 380 us) x 3, while the CR2032 can only supply a 200ua current.
The reason I ask is that I've tested 8 tags and they all fail in the freezer in 2 days. When I inspect the cell voltage, its at 1.5v or 1.6v. When I run the tags outside, they last months. I am assuming there was a brownout event, which pulled the mcu into reset which then discharged the cells.