On Wed, Nov 1, 2017 at 7:40 AM, Ondřej Jirman <m...@xff.cz> wrote: > Hi, > > Icenowy Zheng píše v St 01. 11. 2017 v 08:31 +0800: >> >> And according to the Orange Pi PC2 and Prime schematics, they both >> start at 1.1V. (The Prime schematics even says "For H5 adjust >> VDD-CPUX to 1.1V). >> > > Orange Pi PC2 starts at the same voltage as Orange Pi PC. That is at > 1.308V. > > It can be calculated from 0.6×(1+11.8÷10) as per the values of Ru1/Ru2 > resistors in the schema. It is also my experience of working with these > boards and writing the sy8106a driver.
I think you reverse the Ru values according to pc2 and prime schematic CPUX Vout = 0.6x(1+Ru1/Ru2) so Ru1 10K and Ru2 11.8K then Vout = 0.6x(1+10/11.8) => 1.10V thanks! -- Jagan Teki Free Software Engineer | www.openedev.com U-Boot, Linux | Upstream Maintainer Hyderabad, India. _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de https://lists.denx.de/listinfo/u-boot
