?lvaro Lopes wrote: > * Why was this chosen over PMU 1.8 power rail (IO_1V8) (or the other > way around) ?
I could see the following consequences of connecting GPS to IO_1V8: - this may create an EMI path, so at least a bead should be there. (I.e., instead of R7601) - IO_1V8 stays on in suspend while RF_3V (VDDIO, VCCx, VBP) can be cut. Not sure if this is an operating condition the ATR0635 would be happy in. - IO_1V8 comes from a step-down converter, which is more efficient than an LDO. So if GPS draws a significant current on its 1.8 V rail, that may make a difference. Ideally, someone with a bit of spare time on their hands would measure GPS performance and power consumption on a GTA02, then rework it to use IO_1V8 instead of the internal LDO, and then measure again, and also check what happens if RF_3V is cut. - Werner _______________________________________________ hardware mailing list [email protected] http://lists.openmoko.org/mailman/listinfo/hardware
