I have tested the board again and heres what I have come to:
- Using meanwell 5V ac adapter works when the 10k resistor is NOT
soldered to battery header. If theres resistor soldered, but there is no
battery attached it stops working and the power led blinks all the time.
It really seems that the power controller is trying to switch to the
battery that is not there. After placing the battery everything works
correct. I only home it wont get discharged to fast when the board is off.
W dniu 2014-11-14 o 16:58, Gerald Coley pisze:
And mine.
Gerald
On Fri, Nov 14, 2014 at 9:50 AM, Bremenpl <[email protected]
<mailto:[email protected]>> wrote:
Ill get it tested, thank you. If this worked it would solve my
problem.
Dnia 14 listopada 2014 16:41:30 Gerald Coley
<[email protected] <mailto:[email protected]>> napisał(a):
The output voltage level is different. When the DC is contented
it is supposed to go to the DC input and go into charge mode for
the battery. Measure the output voltage of the PMIC. If it is 5V,
then it is DC in. If it is 3.7V +/- then it is running on the
battery.
Gerald
On Fri, Nov 14, 2014 at 9:37 AM, Bremenpl <[email protected]
<mailto:[email protected]>> wrote:
How can I know either it switched without taking the battery out?
Dnia 14 listopada 2014 16:35:42 Gerald Coley
<[email protected] <mailto:[email protected]>>
napisał(a):
Another test here would be to connect the battery and see if
after it switches to the battery if it switches back to the
DC input.
Gerald
On Fri, Nov 14, 2014 at 9:31 AM, Bremenpl
<[email protected] <mailto:[email protected]>> wrote:
I understand, thank you for the info. I will make more
attempts at monday with another bbb board. For now I
have a 10k resistor on the TS pin because I intend to
use the battery to. If the voltage is measured on the
resistor ill swap it to lower value one. I hope ill get
it working using meanwell power supply.
Dnia 14 listopada 2014 16:16:30 Gerald Coley
<[email protected] <mailto:[email protected]>>
napisał(a):
Not likely. As I said we need more boards that fail and
the power supply that is used with them. What I have
seen is that it tries to switch to the battery, that is
not there, for whatever reason. Theory is it sees a
voltage drop due to the inrush limit on certain power
supplies. I have fixed this on a few boards by
connecting the TS signal hard to ground using the
battery pins on the board.
What I see when the board "does not power up" is the
PMIC cycling on and off. You can look at the 5V output
rail of the PMIC for this condition.
Gerald
On Fri, Nov 14, 2014 at 9:03 AM, Bremenpl
<[email protected] <mailto:[email protected]>> wrote:
I dont agree here, and this is the weird part. A
cheap 5V wall plug adapter works great and a
certified meanwell supply does not. Can it be a
case related to linear/ switching power supply?
Dnia 14 listopada 2014 16:01:26 Gerald Coley
<[email protected]
<mailto:[email protected]>> napisał(a):
We are working on one if we can collect enough
information to confirm the issue. it appears to be
a power supply issue that creates a condition that
the TPS65217C does not like. If you use a good
power supply, the issue is not there.
Gerald
On Fri, Nov 14, 2014 at 8:31 AM, Bremenpl
<[email protected] <mailto:[email protected]>>
wrote:
Is there a workaround for this? I thought that
pre charged capacitors could help but in my
application power to the BeagleBone Black is
aplied in the same time as to the rest of the
circuit.
W dniu 2014-11-14 o 15:19, Gerald Coley pisze:
The power management IC, TPS65217C.
Gerald
On Fri, Nov 14, 2014 at 8:15 AM, Bremenpl
<[email protected]
<mailto:[email protected]>> wrote:
What is the exact circuit that requires a
fast ramp?
W dniu 2014-11-14 o 14:48, evilwulfie pisze:
As Gerald has said before, check the
ramp up of the power supply.
Some of the lab supplys have slow ramp ups.
Yes they are very stable and VERY good
regulation but
the BBB design requires a fast ramp up
supply.
On 11/14/2014 3:03 AM, bremenpl wrote:
Hello there,
I have a very strange problem with
powering up BeagleBone Black (rev
C).... When i try to power it up from
some cheap AC adapter it works fine,
but when I connect to to my labolatory
power supply the power LED on board is
lid for a second and then doesnt power
up the MCU and turns off intead. I have
connected both supplys to osciloscope
and they are both stable, the
laboratory one even more. Why is the
power controller on the BeagleBone
Black refusing to power up the MCU when
powered from lab supply? I have no idea
what is this about. I would aprichiate
any help.
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