> 2009/8/23 Christoph Mair <m...@chonyota.net>: > > The voltage is now between 3.32V and 3.44V which seems to be ok, > > Nice. > > > but after > > suspending it still drops to 2.44V Vmax and 1.78V Vmin (when the compass chip > > starts a measurement). > > Just to make sure I got you right: You enable the "g-sensor" and get about 3.3V, > then you suspend and _while suspended_ you get 2.4V and 1.8V respectively? > What happens when you resume? Do you get back 3.3V? If this is the case you > probably don't set GPD12/13 (CS), GPG7 (CLK), GPG6 (MOSI) to 0 and GPG5 (MISO) > to pulldown during suspend and leak the voltage from the CPU. Can you please > make sure you set those pins during suspend! I switch my Neo on, and the line goes immediately to 3.3V (I'm using Qi, if that matters). After SHR started (but with andy-tracking-kernel) I take the first measurement which results in 3.3V. I never explicitely enabled the g- sensor. Then I suspend the device which results in the voltage drop down to 2.4 (normally) or 1.8 (only if my chip draws some current, I think 1mA max, but I did not check this yet). Right after resuming the voltage rises to 3.3V again. I never touch the other pins since the compass chip has a I²C interface. I just use GSENSOR_3V3 as power supply, because it is easily accessible at C7802.
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