Narendran Pandian

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11 years, 8 months ago.

How to battery power a kl25z?

I am in need of battery powering my Kl25z. However I dont know how to do it. Can anyone explain me or give me a link where I can learn abt this?

You may find this KL25Z low-power tutorial interesting. http://mcuoneclipse.com/2013/10/20/tutorial-using-the-frdm-kl25z-as-low-power-board/ He gets down to 130uA after turning off unneeded resources.

posted by K B 12 Mar 2014

2 Answers

Stephen Paulger
11 years, 8 months ago.

If a coin cell will suffice you can add a coin cell holder to the underside. this part from Farnell should fit and allow you to use a CR2023. Some people have tried this and found that it doesn't work for them (see this mbed question) so it may take a bit of work.

I've not tried this but I think another alternative would be to look at the pinout on the KL25Z handbook page and supply between 5v and 9v to the pin labelled VIN.

If your KL25Z board has the arduino headers it might be possible to power it using an arduino battery shield, I've not tried this either, but if they supply between 5v and 9v to VIN then I think it should work.

Accepted Answer
Erik -
11 years, 8 months ago.

Besides Stephens answer, take into account that the board isn't designed for low power. Even if you use a power pin which doesn't power everything, there is still alot that is powered and is power hungry. If you really need a battery application, you need a very simple board which you probably need to design yourself. If you have just a KL25 it can 'run' on a single coin cell in deepsleep mode something like 10+ years. With the entire board? I don't know the numbers, but I would guess not more than a few days, if you manage that.

My applications is going to be a solar charger . So the charge of the battery might not even matter. I just need to power it through a battery so that it can be used in remote location where a power supply isnt present. I will try giving voltage to Vin or 3.3 V to look whether that power ups the system. Thanks a lot :)

posted by Narendran Pandian 12 Mar 2014