Hello, sorry if I am repetitive but I want to be sure to understand. In caravel specs, there is : Other power domains: • vccd, SoC core voltage, 1.8V nom • vddio / vdda, IO output driver voltage, 3.3 to 5.0V nom Does it mean that a 1.8V supply voltage is directly available and usable for an analog schematic with sky130 1.8V transistors ?

@Etienne Moutinho I’m pretty sure you can use the user vdda1, vdda2 domains anywhere from 1.8V-5V. https://caravel-harness.readthedocs.io/en/latest/maximum-ratings.html

Ok this documentation is useful, thanks

@Etienne Moutinho: There are four power domains that connect into the user wrapper; you can use any of them.

vccd1

and

vccd2

are 1.8V domains; they are typically used for digital but they are not connected to anything outside of the user project (except for two circuits that detect whether the domains are powered or not).

vdda1

and

vdda2

are also available, and since they are specified to be anywhere from 1.8V to 5.5V, you can use them as additional 1.8V domains.

Ok nice thank you for the explanation