nrf52810 won't run under 2.5V

[xanthio]

I'm using nRF52810 in a CR2032 battery powered device.

I use the DCDC mode to enhance power consuption. According to Product Specification in release 1.3 (and unlike nRF52840), the product may run down to 1.7V but I noticed that application don't run below 2.5V.
With such a low voltage, I may not program nor debug the product with my J-Link.

Not enabling the DCDC mode doesn't change the issue.

POF feature is not activated.

May you have some idea of how to have the device working below 2.5V ?

[Turbo J]

xanthio said:

With such a low voltage, I may not program nor debug the product with my J-Link.

The J-Link disables sleep during debugging and programming, resulting in much higher current consumtion (several mA). A CR2032 can support this current (barely) when nearly 100% full, but not when discharged to 2.5 Volts. 

Note that this debug state also needs a power cycle to turn off (and re-enable deep sleep states). I recommend using a current limiting power supply for R&D with NRF chips.