pwsafe: MCU selection, first round

Felix sucotronic at gmail.com
Mon Sep 16 05:11:38 EDT 2013


ooops, I'm very bad at electronics, but I know I forgot a stupid diode xD
(I hope the idea is understood)

[image: Inline image 1]


On Mon, Sep 16, 2013 at 10:15 AM, Felix <sucotronic at gmail.com> wrote:

> Well, the RTC feature is really attractive, so having an independent power
> input for it is cool. The MKL25Z128VFT4 don't have that input, so the
> only thing you can do is to put the cpu in VLLS1 state and connect it
> (whole cpu) to battery (maybe second power bus with a diode?) and it should
> drain few μA.
>
> Should be possible something like following?
>
> [image: Inline image 1]
>
>
>
> On Thu, Sep 12, 2013 at 5:04 AM, Ron K. Jeffries <rjeffries at gmail.com>wrote:
>
>> The KL2 MKL25Z128VFT4   M0+      48 MHz 48-QFN  128 kB   16 kB  USB-Reg,
>> ID
>> looks like a winner based on current information. It certainly doesn't
>> hurt that it costs > $2.00
>> LESS than competing MCUs. Also, it has the better low-power consumption
>> spec.
>>
>> Unrelated [to MCU selection] question in a separate email.
>>
>> I think you are on to something with the password safe idea. Not a mega
>> hit,
>> but a nice little niche that is do-able, and just might catch on. As in
>> Kickstarter
>> is not out of the question, given a lot more work on identifying WHY
>> people need it
>> and might be motivated to invest money. If you can make money with a
>> retail price
>> NTE $50 it can work.
>>
>> Ron K Jeffries
>>
>> ---
>> Ron K. Jeffries
>> 805-567-4670
>>
>>
>>
>>
>>
>>
>> On Wed, Sep 11, 2013 at 3:37 PM, Werner Almesberger <
>> werner at almesberger.net> wrote:
>>
>>> I wrote:
>>> > [ a lot ]
>>>
>>> That should of course have ended with:
>>>
>>> Any comments this far ?
>>>
>>> - Werner
>>>
>>> _______________________________________________
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>>
>>
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>
>
>
> --
> Felix
>



-- 
Felix
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