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7.5V maximum

 
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MosaicDave



Joined: 20 Jul 2010
Posts: 18
Location: Pennsylvania, USA

PostPosted: Thu Jul 29, 2010 2:26 pm    Post subject: 7.5V maximum Reply with quote

I'm beginning to work with the OpenServo V3 design, and I'm having a question:

Most of the online notes and documentation refer to a 7.5V upper limit on the input supply voltage. Where exactly is this number coming from?

I've begun to look around at the absolute max specs for the FETs, voltage regulators, etc., but as of yet I haven't come upon a clear reason for this exact number.

Any insight anyone can offer, would be much appreciated...

Thanks--

--dave
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Cliff



Joined: 23 Jan 2007
Posts: 150
Location: Saratoga, CA

PostPosted: Fri Jul 30, 2010 2:17 am    Post subject: Reply with quote

Dave,

The 7.5V Max. noted on the schematic relates to resistive voltage dividers for signals going to the processor's ADC inputs. If a higher voltage is used, the resistor values will need to be changed to insure that ADC max. input voltage (Vcc +0.5V) is not exceeded.

Cliff
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MosaicDave



Joined: 20 Jul 2010
Posts: 18
Location: Pennsylvania, USA

PostPosted: Fri Jul 30, 2010 2:24 am    Post subject: Reply with quote

Cliff--

Thanks very much, that makes complete sense now.

As it happens, I'm in fact designing a system around motors that operate at a higher voltage, so I'll pay attention to this...

--dc
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