I’m choosing an ARM processor for an application that needs a very low power consumption in standby.
I am currently looking at a LPC2138 or a LPC2106.
Here is the question:
since both chip have 2 separate power supplies (1.8V and 3.3V for LPC2106; 3.3V and Vbat for LPC2138) I wonder if they are both necessary for ram retention.
Is it possible to power them for long time with only one power supply, (vbat for LPC2138 or one of the 2 voltages for LPC2106), without affecting ram content?
The datasheet seems not to talk about that.
This will allow me to save some precious microamp 