Hi!
I'd like to power the USB DK with a coin cell battery, but I found the documentation (UM-B-125) not very clear.
In paragraph 5.20 it states:
"Remove R50 and place R51, or move the jumper from position 1-2 to position 2-3, if pin header J2 is installed"
Could I just remove R50 and R51 (R51 place should be empty, but a resistor is present on my DK), and use J2 to select which power source to use?
Thank you.
Device:
Hi paolog,
Have you placed a pin header on J2? If yes, then you should set it to position 2-3. Otherwise, the R50 (0 Ohm ) should be removed from R50 and placed on R51.
Thanks, PM_Dialog
Hi!
Yes, I placed a pin header on J2. So I'll leave R50 and R51 as they are and will just use a jumper on 1-2 for USB power and to 2-3 for battery power. Correct?
I set the pin header to position 2-3, powered up thru the battery contacts, and found out a current of 30 mA. Could it be the USB adapter absorbing so much current? Or could it be the software not going to sleep while it should?
Hi Paolog,
30mA is excessive. If you place all the S1 switches in the off position, are you seing the same current draw?
/MHv
With all S1 switches off current increases to 33mA.
Please provide a picture of how you soldered the battery or battery connector to the bottom of the USB stick. I worry that the battery holder or the battery connects to some of the testpoints under the battery.
/MHv
I can exclude that. I'm powering the DK with power supplier and using the soldering places of the battery holder.
What I'm doing now first of all is to test the power drain with one of the low power examples, to see if it's our programming not using sleep modes well. Do you confirm I need to keep R50?
Yes R50 must be removed
Ok, compiled and loaded ble_app_sleepmode and got the same 32 mA power consumption, with all S1 switches to off.
Okay lets go over the details of the hardware changes required.
Is it possible that you have a hardware conflict with your software? Try to build and load empty_peripjheral_template and load it into flash (Set the S1 accordingly). This project does not affect any GPIOs, but will advertise it's name "DIALOG-TMPL. In my setup running from battery i see an average power consumption of less than 1mA (sleepmode is not enabled in this project)
/MHv
Hi MHv.
I removed both R50 and whatever was on R51, and used J2 to switch between USB and battery power. I built and loaded in flash the empty peripheral template, but I still have 30mA measured, even with all S1 to off. Could it be a problem with my USB development kit?
A brief update on this issue: I programmed am SOC module with same DIALOG-TMPL project and I have a reading of 470uA, so I think it's something with the USB development kit.
OK, Thx for the update