On 20 May 2015 at 13:55, Maximiliano O. Sonnaillon msonnail...@gmail.com
wrote:
I will probably have to add an extra buffer to have PGOOD in 3.3V level
Heh, it's a pity U3 is an inverter rather than a buffer... it's currently
not actually used (hardware reset is not enabled in eMMC), it's
On 20 May 2015 at 13:55, Maximiliano O. Sonnaillon msonnail...@gmail.com
wrote:
I was considering that one because it's a 3.3V logic signal. PGOOD is a
1.8V signal and the EN pin of U4 has a minimum of 2V to consider it high.
Ick, I completely overlooked that. So it seems there's no single
Thanks for your response.
I see your point about not using SYS_RESETn signal... it can be driven low
by the processor.
I was considering that one because it's a 3.3V logic signal. PGOOD is a
1.8V signal and the EN pin of U4 has a minimum of 2V to consider it high.
[image: Inline image 1]
I will
On 19 May 2015 at 22:41, Max msonnail...@gmail.com wrote:
Did you try any change in the EN pin of U4 (enable signal of 3V3B)?
No, we replaced U4 by this state-of-the-art voltage-tracking regulator:
It can't supply as much current as the original, but our needs are modest
enough.
I'm
Matthijs,
Did you try any change in the EN pin of U4 (enable signal of 3V3B)?
I'm about to try SYS_RESETn (PMIC_PGOOD after U16), but I'm concerned about
the 20ms turn on delay (plus 10ms due to the RC).
The other option is to go back to use 3V3AUX, and add a 1k load resistor to
reduce the
On Friday, 1 May 2015 19:01:06 UTC+2, Matthijs van Duin wrote:
I've captured the shutdown sequence on DC versus BAT power in more detail
Just a quick clarification to avoid confusion:
Unlike the scope images in my original post, these were captured with
BATMON connected to BAT even in the
On Thursday, 30 April 2015 12:14:19 UTC+2, Andrew Bradford wrote:
For reference, I've not seen any failure of the am335x with this rework
when using a custom cape at my previous job. That's not saying there
isn't damage, just that I didn't see any.
I'm also not sure how easily the am335x
Hi Matthijs,
On 04/29/2015 04:12 PM, Matthijs van Duin wrote:
On Wednesday, 29 April 2015 20:18:51 UTC+2, Andrew Bradford wrote:
If you take a BBW and cut the trace coming from U8 pin 5 (the LDO enable
line) and then wire U8 pin 5 to the PWR_LED net on page 2 of the
schematic, then the U8
Hi Matthijs,
On Wed, Apr 29, 2015, at 03:10 AM, Matthijs van Duin wrote:
The PMIC is not the problem here, it properly shuts down all DCDC and LDO
supplies, and requires no configuration other than voltage adjustments
when
desired, and setting the OFF bit before using the RTC to request
On Wednesday, 29 April 2015 17:30:14 UTC+2, Matthijs van Duin wrote:
Your original question is actually very easy to answer
I posted a bit too hastily since I missed the second half of your original
post.
If external hardware unconditionally drives or pulls up to 3V3EXP (in case
of BBW) or
On Wednesday, 29 April 2015 20:18:51 UTC+2, Andrew Bradford wrote:
If you take a BBW and cut the trace coming from U8 pin 5 (the LDO enable
line) and then wire U8 pin 5 to the PWR_LED net on page 2 of the
schematic, then the U8 LDO will shutdown correctly when on battery.
It will shut
On Wed, Apr 29, 2015, at 01:07 PM, Matthijs van Duin wrote:
On Wednesday, 29 April 2015 17:30:14 UTC+2, Matthijs van Duin wrote:
Your original question is actually very easy to answer
I posted a bit too hastily since I missed the second half of your
original
post.
If external
On Wednesday, 29 April 2015 14:00:17 UTC+2, Andrew Bradford wrote:
You seem to be talking about the BBB, correct?
Correct, though it seems nearly all posts in this thread are referring to
the BBB issue?
My initial work was on BBW back in 2012 (prior to BBB release).
It sounds like BBB has
PM
To: beagl...@googlegroups.com beagl...@googlegroups.com
Cc: and...@bradfordembedded.com
Subject: [beagleboard] Re: Bone VDD_3V3EXP Disable Issues
Does anyone know if there is a software solution to this issue? I
haven't seen any changes in the recent hardware revisions to address
...@googlegroups.com
javascript:
Cc: and...@bradfordembedded.com javascript:
Subject: [beagleboard] Re: Bone VDD_3V3EXP Disable Issues
Does anyone know if there is a software solution to this issue? I haven't
seen any changes in the recent hardware revisions to address this. We are
currently
Does anyone know if there is a software solution to this issue? I haven't
seen any changes in the recent hardware revisions to address this. We are
currently planning on deploying a couple of dozen BBB and I would prefer
not having to make hardware mods.
Terry
On Thursday, January 30, 2014
On Friday, January 31, 2014 4:34:51 AM UTC+11, Brad Andersen wrote:
An update:
For the A6 (Beaglebone Black) version, I connected U4 pin 1 (enable) back
to VDD_3V3AUX (same as A5C). It now shuts down correctly while on
battery. This was verified on two A6 BBB.
The mystery is what
An update:
For the A6 (Beaglebone Black) version, I connected U4 pin 1 (enable) back
to VDD_3V3AUX (same as A5C). It now shuts down correctly while on
battery. This was verified on two A6 BBB.
The mystery is what causes the VDD_3V3A to hang up on the A6 version when
shutting down while on
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