Hi chrysn, On Fri, Nov 14, 2014 at 05:43:47PM +0100, chrysn wrote: > > i was afraid so when i first saw them, but i never ran into an > UNDER-VOLTAGE POWER DOWN condition so far; thing is, i'm running my > entire board off 3.3V, which is the threshold for the warning. the > module can do down to 3.2V, and a 2m2 cap in parallel with a 4u7 and > 100n make sure it won't even if the usb power supply doesn't handle > bursts well. > > i hope it's sufficient -- or are you confident that this is indication > of trouble even when running on 3v3?
GSM modems connected to anything else than a li-ion battery should really be powered with a 3.8V 2A-peak low ripple power supply with enough decoupling capacitors (300 µF at least if powered through a DC/DC converter) for them to work correctly. Sylvain
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