what is micro-ESB ? nRF52810 have AD(Analog to Digital)?

Hi,

I finally want to integrate BLE and 2.4G in nRF52810.

【1】I am studying  Timeslot,i found some articles in DevZone.

There is a mention of micro-ESB , so what is micro-ESB ? (There are many abbreviations that don’t understand what it means)

【2】I need to detect the voltage of the lithium battery, no instructions for this section were found in the nRF52810 documentation.

Keyword is AD ? or other?

(Forgive me for studying mobile apps before , MCU knowledge is not very sufficient)

Thanks all