GTA02 GPS chip (ATR0635) VDD 1.8 power rail
alvieboy at alvie.com
Mon Jun 22 10:29:21 CEST 2009
CC: hardware @ openmoko.
According to GTA02V5 schematics, the GPS (ATR0635) VDD_1.8 power rail can be connected to PMU output or to the chip's 1.8V LDO, by choosing which resistors (0R)
to be connected during PCB assembly.
Right now (according to schematics) it is being powered by its internal LDO. We (the #gta02-core team) would like to remove the unnecessary pads from the layout
and schematics, but we have some questions:
* Is VDD_1.8 actually connected to the LDO ?
* Why was this chosen over PMU 1.8 power rail (IO_1V8) (or the other way around) ?
* Shall we keep it as is or switch to PMU ? (or the other way around)
More information about the hardware