On 14 Feb 2011, at 20:01, Plastic <[email protected]> wrote:
<snip>
>>>>
>>>> Is the CR2032 man enough though?
>>>>
>>>
>>>
>>> The CR2032 is 3V 235ma, and on this card would need to be replaced every
>>> three years or so, which would be a simple "pop a new one in" operation...
>>> The 40LF220 had a lower current capacity but was designed for a long
>>> shelf
>>> life of ten years, hence the bulk. So yes, the CR2032 truly fits this
>>> application.
>>>
>>> The format is standard for battery backed clocks on PCs, but was quite new
>>> in the late 80s.
>>>
>>> I will look at current costs for getting a batch of 100 of these tiny,
>>> single layer PCBs made.
>>>
>>> Couldn't the card have a battery socket so that only the battery need be
>> replaced?
>>
>> ( ... and why are you not yet living Texas time - it is 2am (8-)# )
>
>
> That is exactly what I was describing ;) A simple adaptor card to a CR2032
> socket, and a CR2032 battery.
Ah sorry.
3 years though seems a mite short. I wonder if there is a more beefier battery
that is thin enough - or maybe a chargeable one?
Tony
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