Hi, I am using inbuilt RTC in LPC2368. My query is if vdd is on(from SMPS) condition,then RTC draws power from 3.3v cell button battery or Vdd(controller core)?
what is mean by,
IBATact --> active mode battery supply current - DC-DC on = 20uA - DC-DC off = 28uA (page no 35 from datasheet)
The RTC runs from the battery. But with the processor core powered, there is less leakage current in the I/O interface between RTC and processor.