Re: [Platformx-sg2-devel] power measurements for SG2

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Nilanjan,=20

The J2 connector is for connecting the Lithium Ion battery which about
4.2V to 4.4V. If you could apply that the voltage in that range to J2
then you should be able to power the SG2 from this source.

Alex,

-----Original Message-----
From: pla...@li...
[mailto:pla...@li...] On Behalf Of
ni...@cs...
Sent: Thursday, October 19, 2006 1:08 PM
To: Pering, Trevor
Cc: pla...@li...
Subject: Re: [Platformx-sg2-devel] power measurements for SG2

I have been trying to power SG2 from the 3.3 V supply (through connector
J2).

My console on my PC uses the miniusb on the SG2 main card (J9), which
can also
be used to supply power to the main board.=20

So, when both the miniusb is plugged in and I am trying to supply power
through
the 3.3 V supply (J2) the board draws power through the miniusb alone.
Is
there any way ( a jumper or a switch onboard) which can be used to
switch off
power supplied from miniusb and use it only for the console on the PC.

-Nilanjan  =20

P.S. : Sorry for the late reply on your previous question. I will try
the 3.3 V
supply once the above problem is solved. I am using a DLINK AIR DCF-660W
Wireless card.

Quoting "Pering, Trevor" <tre...@in...>:

> Ah -- can you try it with the 3.3 supply?  The 5V USB supply is
really,
> well, for the USB and so it's not really integrated with the PCMCIA.
If
> you really need it I'm sure it can be made to work...
>=20
> Try controlling the USB power to see how that works.  I think removing
> the USB modules might do it, or you can try something like "echo off >
> /proc/pmic/USBH" to turn it off...
>=20
> What kind of card are you using with the system?
>=20
> 	Trevor
> =20
>=20
> -----Original Message-----
> From: ni...@cs... [mailto:ni...@cs...]=20
> Sent: Thursday, October 05, 2006 5:05 PM
> To: Pering, Trevor
> Cc: pla...@li...
> Subject: RE: [Platformx-sg2-devel] power measurements for SG2
>=20
> I am using the 5V USB supply (C).
>=20
> -Nilanjan
>=20
>=20
> Quoting "Pering, Trevor" <tre...@in...>:
>=20
> > It depends somewhat -- how are you powering it?  There are three
> several
> > options:
> >=20
> > A) External 5V supply
> > B) Battery direct
> > C) 5V USB Charge Pump
> > D) 3.3V regulator
> >=20
> > Each one has a different way of control... What configuration are
you
> > using?
> >=20
> > If it's option D), then the method that Ed describes should do it,
but
> > if it's not then we can poke on it some more...
> >=20
> > 	Trevor
> >=20
> >=20
> > =20
> >=20
> > -----Original Message-----
> > From: pla...@li...
> > [mailto:pla...@li...] On Behalf
> Of
> > ni...@cs...
> > Sent: Wednesday, October 04, 2006 10:25 AM
> > To: pla...@li...
> > Subject: Re: [Platformx-sg2-devel] power measurements for SG2
> >=20
> > I tried it with a laptop. It does draw more power that I would
expect
> > , around 150 mW, but nothing like 500 mW that it shows on the
> stargate.
> > However,
> > I can get around this problem by powering the mote separately rather
> > than the USB.
> >=20
> > I want some help regarding the suspension/standby power of the
> stargate.
> > In a
> > mail, few weeks ago, you said you will help me debug why the
stargate
> > was
> > pulling such a lot of power during suspension. From my experiments,
I
> > could
> > figure out that the power supply to the CF card is not being cut
off.
> > Will
> > just unloading the drivers cut the current supply *completely* to
the
> > CF slot.
> >=20
> > -Nilanjan
> >=20
> >=20
> > Quoting "Pering, Trevor" <tre...@in...>:
> >=20
> > > Huh -- not really sure what to say.  Seems like the TelosB is
doing
> > > something weird -- there is really nothing that the SG2
could/should
> > be
> > > able to do to cause this problem.  It's a very simple circuit, and
> the
> > > fact that it's fine with another USB device indicates that the HW
is
> > ok.
> > >=20
> > > Have you measured the power of the TelosB platform with a
different
> > USB
> > > master?  E.g., a laptop of some kind?
> > >=20
> > > Cheers,
> > > 	Trevor
> > >=20
> > >=20
> > > -----Original Message-----
> > > From: pla...@li...
> > > [mailto:pla...@li...] On
Behalf
> > Of
> > > ni...@cs...
> > > Sent: Wednesday, September 27, 2006 3:14 PM
> > > To: pla...@li...
> > > Subject: Re: [Platformx-sg2-devel] power measurements for SG2
> > >=20
> > > Hi Trevor,
> > > Sorry for the late reply. I did what you asked. It seems like the
> > > problem only
> > > occurs with a tmote sky mote (and not with a SanDisk USB memory
> > stick).
> > > I have
> > > answered inline in detail using ---.
> > >=20
> > >=20
> > > Quoting "Pering, Trevor" <tre...@in...>:
> > >=20
> > > > Nilanjan, so -- you are saying that if the USBH interface *is*
> > powered
> > > > up, but that a USB dongle is NOT plugged in, that there is *no*
> > > leakage?
> > > > That is, under what conditions does the leakage occur?  When the
> > rail
> > > is
> > > > powered up?  When the USB dongle is plugged in? =20
> > >=20
> > > --- When the USBH *is* powered up but the TelosB is not plugged
in,
> > > there
> > > is *no* leakage. The leakage only occurs with the mote is plugged
> in.
> > >=20
> > >=20
> > >=20
> > > > Also, can you try it with J12 removed -- this is the power for
the
> > > > PCMCIA socket.  It just isolates it some, but I wouldn't expect
it
> > to
> > > do
> > > > anything. =20
> > >=20
> > > -- Removing J12 doesnot help.
> > >=20
> > >=20
> > >=20
> > > > Oh, if you try the port with something else other than the
TelosB,
> > > e.g.,
> > > > a memory stick -- do you see similar problems?  =20
> > >=20
> > >=20
> > > --- The problem doesnot occur with a memory stick. I used a 512 MB
> > > SanDisk
> > > USB memory stick in place of the TelosB and there was no leakage.
> The
> > > system
> > > drew around 350 mW of power (as expected).I tried different
programs
> > on
> > > the=20
> > > TelosB , but the leakage still remained.
> > >=20
> > >=20
> > > > And, if you disable the software drivers (prevent the USB
modules
> > from
> > > > being loaded), do you see the same effect?
> > >=20
> > >=20
> > > ---Unloading the  USB drivers didnot help.
> > >=20
> > >=20
> > > > Depending on what you find we might need/want to get Alex to
poke
> at
> > > it
> > > > some, but we would need a very specific test case for him to
> > > isolate...
> > > >=20
> > > > Cheers,
> > > > 	Trevor
> > > >=20
> > >=20
> > >=20
> > >=20
> > >=20
> > >=20
> > >=20
> > > Thanks,
> > > Nilanjan
> > >=20
> > >=20
> > >=20
> > >=20
> > > > -----Original Message-----
> > > > From: Nilanjan Banerjee [mailto:ni...@cs...]=20
> > > > Sent: Wednesday, September 13, 2006 2:45 PM
> > > > To: Pering, Trevor
> > > > Cc: pla...@li...
> > > > Subject: RE: [Platformx-sg2-devel] power measurements for SG2
> > > >=20
> > > > I made a mistake in the last mail. It is actually the charge
pump
> > mode
> > > > which has a larger leakage current. I got the pins 1 2 3 on J8
in
> > the=20
> > > > reverse direction. So my measurement on charge pump and "direct
> from
> > > > the battery" mode should be swapped.
> > > >=20
> > > > Indeed powering off the power by echo off > /proc/pmic/USBH
makes
> > the
> > > > leakage goes away for the charge pump mode. I am using revision
> 2.2
> > > for=20
> > > > the mothercard.
> > > >=20
> > > > -Nilanjan
> > > >=20
> > > > On Wed, 13 Sep 2006, Pering, Trevor wrote:
> > > >=20
> > > > > Hmmm -- not sure where the power is going. You could try
> manually
> > > > > turning subsystems off one by one to see if it helps at all.
> The
> > > > power
> > > > > rails are listed in /proc/pmic/VDD_* -- and if you do
something
> > > like:
> > > > >
> > > > > echo off > /proc/pmic/VDD_CC2420
> > > > >
> > > > > it should turn power off to that rail.  There are some rails
> that
> > > you
> > > > > can't really turn off and still have a functional system.
E.g.,
> > > > VCC_IO.
> > > > > However, you can turn it off once and see how much it drops
the
> > > power,
> > > > > but you'll need to power-cycle to get it working again.
> > > > >
> > > > > Also, if you turn the power off for the charge pump (USBH),
does
> > the
> > > > > leakage go away?  This would be the obvious place and it would
> > > > indicate
> > > > > that there is some kind of leakage in that part of the system
> that
> > > we
> > > > > could look for... That power rail does go a few other places
so
> it
> > > > > wouldn't be unreasonable.
> > > > >
> > > > > Just to verify, which version of the board do you have?  This
> > should
> > > > be
> > > > > something like 2.1 or 2.2, and would be written in the silk
> screen
> > > > > somewhere...
> > > > >
> > > > > Cheers,
> > > > > 	Trevor
> > > > >
> > > > >
> > > > > -----Original Message-----
> > > > > From: ni...@cs... [mailto:ni...@cs...]
> > > > > Sent: Wednesday, September 13, 2006 12:38 PM
> > > > > To: Pering, Trevor
> > > > > Cc: pla...@li...
> > > > > Subject: RE: [Platformx-sg2-devel] power measurements for SG2
> > > > >
> > > > > Hi,
> > > > > I was using the "direct from the battery" to power the USB.
> > > > > So I tried the charge pump too. So these are
> > > > > the power characteristics for the above two modes of
> > > > > powering the usb.
> > > > >
> > > > > 1. "direct from the battery" : Initially, for about 30
> > > > > seconds the power consumption rises to  1170 mW. It seems
> > > > > that for this period of time a process called "usb.agent" is
> > > > > using about 15% of the CPU. Once this process terminates
> > > > > the power consumption falls to about 780 mW. The mote
> > > > > alone from the usb draws 145 mW. (This is high but this
> > > > > is the amount that it draws independently from a laptop
> > > > > usb too. I will try to see why this is the case !!). So
> > > > > there is at least a leakage of about 360 mW somewhere else.
> > > > >
> > > > >
> > > > > 2. charge pump : Initially for about 30 seconds the
> > > > > power rises to 850 mW due to the process usb.agent, I guess.
> > > > > and then it falls to 490 mW. the mote again pulls around
> > > > > 145 mW. So there is a leakage of about 75 mW.
> > > > >
> > > > >
> > > > > What does this process usb.agent actually do ? It runs for a
> long
> > > > > time (30 seconds) and energy consumption during this time
> > > > > is high ? Can it be brought down ?
> > > > >
> > > > >
> > > > > For the suspension number of 98mW, I didnot use the daughter
> > > > > card, the usb , the CF or SD slot. However, I experimented
> > > > > today by attaching a mote to the USB and the Wifi card in
> > > > > the CF slot. None of the these subsystems are being
> > > > > turned off on suspension, and consequently on suspension, with
> the
> > > CF
> > > > > card and the mote attached the power consumption is around
> > > > > a watt.
> > > > >
> > > > >
> > > > > -Nilanjan
> > > > >
> > > > >
> > > > >
> > > > > Quoting "Pering, Trevor" <tre...@in...>:
> > > > >
> > > > >> Nilanjan, thanks for you questions.
> > > > >>
> > > > >> 1) short answer is I don't know, but you're right that it's
> very
> > > > >> strange. How are you powering the USB interface?  There are
two
> > > > > options:
> > > > >> direct from the battery (high current, but lower voltage) or
> from
> > > the
> > > > >> on-board charge pump (5V, but limited current).  This is
> > controlled
> > > > by
> > > > >> jumper J8 on the board (which should be fairly near the USBH
> > > > > connector).
> > > > >>
> > > > >> You can try turning off the power, either by removing the
> jumper,
> > > or
> > > > > if
> > > > >> it's using the charge-pump by doing "echo off >
> /proc/pmic/USBH"
> > or
> > > > >> something like that -- just to see what's going on.
> > > > >>
> > > > >> Also, if nothing else comes up, it would be good/interesting
to
> > > > > measure
> > > > >> the power consumption of the mote with a similar
> > resistor-in-series
> > > > >> trick just to see if that's indeed where the power is
going...
> > > > >>
> > > > >> Maybe it's a software issue -- when you plug the telosB mote
> in,
> > is
> > > > >> there any process that's consuming a lot of CPU?  Does ps
show
> > any
> > > > CPU
> > > > >> usage? Uptime?  I think there are/were some issues with the
> udev
> > > > >> filesystem that would cause it to consume a lot of CPU for a
> > short
> > > > > time.
> > > > >> How long does it run at 830mW for...?  Is it still like that
20
> > > > > minutes
> > > > >> later?  Actually, now that I think of it I think there is
> > something
> > > > to
> > > > >> this line, so maybe check it first.
> > > > >>
> > > > >> 2) Yah, I think your correct again in that I don't think
we've
> > done
> > > > >> anything really to reduce the power consumption in sleep
mode,
> so
> > > > > there
> > > > >> are probably a lot of peripherals that are still on.  Is this
> > with
> > > > the
> > > > >> DC plugged in?  I think the Ethernet interface probably
> consumes
> > a
> > > > lot
> > > > >> if so.  Otherwise, probably need to go through each subsystem
> and
> > > > > think
> > > > >> about what kind of low-power state they might be in...  Let
me
> > know
> > > > > how
> > > > >> you want to proceed on this -- I could help you make a list
of
> > all
> > > > the
> > > > >> subsystems and then we could discuss what might need to be
done
> > for
> > > > > each
> > > > >> of them...
> > > > >>
> > > > >> Cheers,
> > > > >> 	Trevor
> > > > >>
> > > > >>
> > > > >> -----Original Message-----
> > > > >> From: pla...@li...
> > > > >> [mailto:pla...@li...] On
> > > Behalf
> > > > > Of
> > > > >> ni...@cs...
> > > > >> Sent: Tuesday, September 12, 2006 11:47 AM
> > > > >> To: pla...@li...
> > > > >> Subject: [Platformx-sg2-devel] power measurements for SG2
> > > > >>
> > > > >> Hi,
> > > > >> I did some power measurements for the stargate 2 platform.
> > > > >> I just used the mothercard for the measurements (no daughter
> > > > >> card). I attached a 1 ohm resistance in series with the mini
> usb
> > > > cable
> > > > >
> > > > >> and used a NI-DAQ to measure the voltage across the resistor
> > > > >> and subsequently the current and the power consumed by
> > > > >> the stargate.
> > > > >>
> > > > >> I have the following two questions in this regard.
> > > > >>
> > > > >> 1. The idle power of the platform (without any
> > > > >> CF or SD card ) is around 270 mW, which
> > > > >> seems reasonable. However, as soon as I plug in a Telosb
> > > > >> using the USB on the mothercard, the power consumption
> > > > >> rises to 830 mW. This seems like an odd jump, as the mote
> > > > >> alone doesnot draw more than 50 mW of power. I am using
> > > > >> the ftdi_sio driver and the stargate recognises the Telosb
> > > > >> correctly and is able to communicate with it.
> > > > >>
> > > > >>
> > > > >> 2. The standby/suspension power of the platform is around
> > > > >> 98 mW which is also kind of high, since I remember that
> > > > >> Stargate 1 with the daughter card removed pulled around
> > > > >> 35 mW of power. However, in this case, it might be a
> > > > >> possible software problem, like maybe unloading the proper
> > > > >> device drivers before suspension ?
> > > > >>
> > > > >>
> > > > >>
> > > > >>
> > > > >> -Nilanjan
> > > > >>
> > > > >>
> > > > >>
> > > > >> -------------------------------------------------
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> > > > >>
> > > > >>
> > > > >
> > > >
> > >
> >
>
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