> [Christoph Mair So 23. August 2009]: > > > 2009/8/23 Christoph Mair <[email protected]>: > > > > 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 pleasemake sure you set those pins during suspend! > > ^^^^!
> As suspected in my other posting, and explained by Sven, the GSENSOR_3V3 rail > may see "phantom"-feeding by the data(MOSI)/clk-lines if those are at 3V3 > while LDO in PMU is powered down, during suspend. It doesn't matter if you > touch those lines, the feeding may take a path thru the gmeters (the clamp > diodes there) so you see some voltage of 3V3 - (voltage-drop on diode). > Please check as suggested by Sven GPD12/13 (G1_CS and G2_CS) remain high (3V3) after suspend. This probably leaks current into G1/2_INT and SPI_MISO1 which are at 2V4. Christoph _______________________________________________ hardware mailing list [email protected] http://lists.openmoko.org/mailman/listinfo/hardware
