nrf52833 standby current reaches 60uA

Question

First, NRF52833 work environment at 100 degrees celsius, standby current reaches 60uA. 
 Second, When the NRF52833 working in 100 degrees Celsius, what kind of processing software or hardware needs to be done. 
 Third, When the NRF52833 dormant, how to shielding the red signal in the frame? As is shown.

hmolesworth · Answer

The refresh frequency is directly related to the reservoir/smoothing capacitance fitted to the regulator output. Assuming ceramic capacitors, the capacitance already should be derated 50% from the required value, so a 3.3 volt output requires a 6.3 volt capacitor. 
 With increase in temperature, the capacitance further decreases (by as much as 30% depending on capacitor type). A 30% decrease in DC-DC capacitance would result in an increase in frequency by a similar amount as the refresh tries to maintain a fixed mean voltage with a faster decaying capacitor voltage, which likely explains the figures you are seeing. There are capacitors which would have better temperature performance, or alternatively choose a larger capacitance value. Tantalum capacitors are entirely unsuitable in this application due to very high leakage. Also the internal leakage of the nRF52833 rises with temperature, and there is no control over this but it can be measured by testing an isolated part, crudely put swiftly heat the package of the nRF52833 alone to 100 degrees while not heating the rest of the board and components.