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Assault and batteries

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NielV
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re: Assault and batteries
NielV   7/18/2011 8:32:37 PM
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Soft-off can still be virtually the same as hard-off by releasing the enable line of a voltage regulator. Isn't that what the original alarm remote controls did with a diode-or power enable, before the function was ported into remote control ICs? I've just finished an industrial product design where soft-off draws less than 1uA and the 1-year self discharge rate of the 26650 LiFePO4 cell is over 300uA. Soft-off is done by releasing the enable line of a load-disconnect switching regulator, but if the software guys did not fight against keeping the supply permanently on and the micro running then the low power standby current would still have been only about 35uA. For the next project the software guys are talking about keeping the micro running, which give instant start-up of the operating system. Note the capacity of Li coin cells depend on the current draw and termination voltage. They are intended for only a few mA mx.

wkcheung
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re: Assault and batteries
wkcheung   11/16/2009 7:51:50 AM
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25 years ago when I am working in a watch and clock with LCD display, ex-fty product should be < 2uA and majority is under 1uA. Presently the problem is customer requests more function but some of them are not needed but only for selling point especially to be chasing faster device like Mobile phone why needs so many function. So present product are more power hungery.

Bill2311
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re: Assault and batteries
Bill2311   11/6/2009 12:56:57 PM
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Newer, smaller geometries are not less power hungry, they are faster. The oscillator for most clocks is only 32.758 kHZ. so the added speed is wasted. The leakage current in the newer, sub-micron parts is also higher.

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