Teensy 3.1 current drawn

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yair

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Hi, I was looking at the site's table for current drawn. https://www.pjrc.com/teensy/low_power.html

I noticed there is no column for the teensy 3.1

I am using this library https://github.com/duff2013/LowPower_Teensy3 to implement hibernate mode.

I was wondering how I might discern how much current is drawn while my teensy 3.1 is hibernating and how much is drawn while it is running.

My teensy 3.1 is in a circuit with an SD card adapter and a string potentiometer. Is their a way to figure out how much current the full circuit draws?

I have tried to use a multimeter in series to measure current, but for some reason I can't get any reading at all.

Thank you in advance for any help you can offer.
 
yair said:
I was wondering how I might discern how much current is drawn while my teensy 3.1 is hibernating and how much is drawn while it is running.
Click to expand...
in hibernate will draw about 250uA, while running depends what cpu speed your at.

yair said:
My teensy 3.1 is in a circuit with an SD card adapter and a string potentiometer. Is their a way to figure out how much current the full circuit draws?
Click to expand...
measure with your mulitimeter in series at the power supply source.

yair said:
I have tried to use a multimeter in series to measure current, but for some reason I can't get any reading at all.
Click to expand...
check your fuses.

Headroom said:
For a true measurement of a system under "load", for such small currents you'd need something like this:

http://www.adafruit.com/products/882
Click to expand...
I want one of those too, I can't find anyone that has them in stock if anyone knows please let me know!
 
duff said:
in hibernate will draw about 250uA, while running depends what cpu speed your at.
Click to expand...

How do you know this? can I see a source?

I was just researching this and I found this thread:
http://forum.pjrc.com/threads/23660...-Battery-Operation-Solutions-For-The-Teensy-3
this part is what i saw:

"Sleep Mode: Very Low Leakage Stop (VLLS3) -- Hibernate
Downloaded program: Hibernate_Simple @ 24 Mhz
Hibernate current = 6.636 ma. <------<<<<<
Note: Installed reset handler patch
Note: Bootloader chip is not in hibernate mode
Note: Printing over USB when going into hibernate
keeps the current consumption at 12.566 ma. ???
Note: Disable USB printing will make hibernate work????"


thoughts?
 
cause i wrote the library you are using, and I have measured it many times along with many other people. Read that whole thread.
 
I am using
LP.Hibernate(RTCA_WAKE, 5);
rather than
LP.Hibernate(LPTMR_WAKE, 5000);

Can you explain the difference between these two things.
 
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