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PIC18F6720
Just an update from my previous message about the PIC18Fxx20 family. I just got a new Processor Module for the ICE2000 and it seems to work fine with the PIC18F6720.
So far, no problems...
We'll see how the ICD2 thing goes in a week or two.
Stallion
mclr pic16f877 circuit
I just added ICSP in both of my circuits. Here is what/how I found/did.
Using the 16F was pretty easy. Simply put a diode on the VPP (pin 1), RB6 & RB7 are both outputs on my circuit. So, this had no adverse effect by simply connecting them directly to my programmer...
Oldman,
I have designed motor controllers in the past. You should PWM at 25-28KHz. Anything greater than that will not be very efficient. Anything less, you’ll more than likely get your audible noise.
ST has some pretty good information.
Good Luck,
Stallion
Oooops, sorry.
Well, then I would use a 220 ohm resistor to GND.
4mA = 0.88V
20mA = 4.4V
You could also use a couple of op-amps to get 0-5V insted of 0.88 - 4.4V. This method works well.
Another alternative, but more expensive, is a Burr-Brown part, RCV420. (I think that is right) Anyway...
Use a PWM output of the pic through an R-C network to filter it in to a voltage controlled current source using an op-amp. It is cheap and easy...
Look at the Microchip web site for getting an anlog output from a pic.
Look at National or fairchild op-amp data sheets for voltage controlled...
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