Author Topic: USB Supply vs Battery  (Read 1348 times)

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Offline iEtheTopic starter

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USB Supply vs Battery
« on: November 09, 2013, 11:21:30 PM »
Hi guys,

I`m attempting to build my own pcb for the purpose to be use with embedded pc. The thing is, i`m wondering whether it best to supply the uC from the pc (usb serial com, since i`m going to have the uC to communicate with the pc from time to time), or just take the regulated dc voltage from the battery? Please advise, thanks\


Offline vipulan12

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Re: USB Supply vs Battery
« Reply #1 on: November 10, 2013, 07:42:51 AM »
what is the embedded pc going to be used for?

Offline jwatte

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Re: USB Supply vs Battery
« Reply #2 on: November 10, 2013, 12:51:24 PM »
If you're OK with the microcontroller only being on when the PC USB bus outputs power, and the power limitations of USB are OK for you, then using USB power is just as good as using regulated battery power.
A bonus might be that the USB power probably is regulated with an efficient DC DC converter, not an inefficient linear regulator, and thus might draw slightly less from the battery for the equivalent power than a linear regulator would.


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