My problem is that I have a RF chip which is supplied 3V3 and interfaces with my MCU over 1V8/2V8.
I have an external source of 3V3 which will supply the RF chip. I'm space restrained on my PCB and as such would like to have the least amount of external extra components. This means I prefer not to LLC the UART lines between the MCU and RF chip.
My MCU can run on between 1V8 and 3V3. As such it would be possible to run the MCU at 1V8 and bypass the LLC question.
Would it be possible to run this MCU using a resistor divider circuit wherein the 3V3 is converted into 1V8?
My MCU sinks 142 µA/MHz at 3V and runs at 24MHz making 3,408 mA at 3V. (5,68mA @ 1V8) Which is a relatively small amount of current which makes me think the normal problems with resistor circuits as supply source (e.g. variable and highly subjective voltages) would be possible.
Is this line of thought correct or would I be better of using an 3V3->1V8 LDO?