This functionality is actually very good for me. I was intending to make
a system that prevents user from turning off BeagleBone Black without
proper shutdown. I thought i will have to implement this in code, but
since the BeagleBone Black is shutting down automatically after the main
supply is down (running on the battery in that time) i dont have to do
this on my own. Please correct me if I am wrong in understanding this.
W dniu 2014-11-17 o 12:44, Gerald Coley pisze:
I can accept that. This woul be only for non battery operation.
Gerald
On Monday, November 17, 2014, Bremenpl <[email protected]
<mailto:[email protected]>> wrote:
And also an important thing- I cannot turn on BeagleBone Black on
battery only now.
W dniu 2014-11-17 o 11:48, Gerald Coley pisze:
Replace the resistor with a wire and just short it to ground.
Gerald
On Monday, November 17, 2014, Bremenpl <[email protected]
<javascript:_e(%7B%7D,'cvml','[email protected]');>> wrote:
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]> 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]> 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]> wrote:
How can I know either it switched without taking
the battery out?
Dnia 14 listopada 2014 16:35:42 Gerald Coley
<[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]> 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]> 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]> 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]> 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]> 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]> 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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