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Re: [lwip-users] hayes commands popping up in ppp stream
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From: |
Sylvain Rochet |
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Subject: |
Re: [lwip-users] hayes commands popping up in ppp stream |
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Date: |
Fri, 14 Nov 2014 21:42:55 +0100 |
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User-agent: |
Mutt/1.5.21 (2010-09-15) |
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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