[18650] Re: Questions of Current Design (6/28/04)
- From: 1davide@xxxxxxx (Davide Andrea)
- To: 18650@xxxxxxxxxxxxx
- Date: Thu, 26 Aug 2004 21:20:38 +0000
>
> 1) Temperature sensor on PCB?
> Since the power resistors are also on the PCB, wouldn't this affect the
> temperature of the PCB? I would think a remote temperature sensor embedded
> in the module would be more accurate.
Yes, I considered that.
1) I assume that the resistors won't be On but in special cases, and then we'll
know not to trust the temperature reading
2) If fit snugly against a cell, the sensor will sense that cell's temperature.
Now, if that temperature increases because of the shunt resistors, then that
still is that cell's temperature
3) The resistors dissipate only 2 W, which won't heat-up the cells that much (I
assume)
4) The ease and reliability of having everything on one PCB was for me the
overriding factor; everything else is just me rationalizing ;-)
> 2) ICSP ? which programmer?
> I do not have a in-circuit programmer and plan to get one. Which one
> are you using and which one you recommend?
The EPIC. It's OK, cheap, decent software. I'm looking to get a USB ICSP, much
better. It's what my German partners are using, made in the Check republic. But
I have to import it. I'll send you a link later.
> 3) 2.048V ref might be better?
> I think a 2.048V reference voltage would put us closer to the mid point
> of the ADC range.
I'll look into it. Not much difference. I'd decide based on accuracy. I'd think
that 2.5 V is a bandgap volatge, and therefore inherently better. I'll let you
know.
> 4) Why ground pin 10?
> Why is pin 10 on U1 (PIC) grounded?
PCB layout reasons. Otherwise I'd need a bridge. (It's a single sided PCB).
Davide
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