gnupic: Re: [gnupic] WISP628 programmer layout design?
Subject:
RE: [gnupic] WISP628 programmer layout design?
From:
"Chen Xiao Fan" ####@####.####
Date:
6 Feb 2006 00:35:39 +0000
Message-Id: <7D4AB72251D4D949AB2732ABEABDA54F130022@PFSG-MX1.ap.p-f.biz>
> -----Original Message-----
> From: Jay Dagenais
> Sent: Monday, February 06, 2006 5:38 AM
> To: ####@####.####
> Subject: Re: [gnupic] WISP628 programmer layout design?
>
> So this programmer gets its power from the hosting
> computer, no? and the 13V needed is generated from the? I think
> that I need a bit of an explanation-more than what the page
> describes, because I don't know what the charge pump is, looks
> like a couple of caps to me and a couple of diodes for protection,
> but I don't know anything so...
I guess you will be better off buying the kit from Wouter. Wisp628A
needs a 5V supply. It generates Vpp using the charge pump. Google
will tell you what is a charge pump. I will say it is not as
easy to understand as other circuits but you can try to build it
and measure the voltage and waveforms at different points.
> You mention that you have a breadboard version already, how many types
> of PIC's have you programmed with it so far, and were there changes to
> the design that were necessary to implement programming of certain types?
I have used it to program many PICs (12F629/12F683/16F630/16F636/
16F684/18F252/18F2550/18F2580 and some others for testing of
xwisp2w) and you do not need to change the programmer in order to
do that. The only limitation is the dongle needed to program certain
PICs (eg: 12F629/12F675/16F630/16F676) with certain configurations
(internal oscillator and internal MCLR). In general I think Wisp628A
is a good programmer to have and it will be worth the money to buy the
kit from Wouter.
Another possibility is to buy the PICKit 2 from Microchip.
> One last question I have regards the type of PIC used in the
> programmer, does this PIC have to be a 16F628, or could one
> use a PIC18F252 for example?
This PIC has to be a 16F628A and you can not use a PIC18F252.
The firmware is designed for 16F628/16F628A/16F648A so you
may be able to use 16F628 or 16F648A as well but I have not
tried those two. 16F628 is an old part anyway.
To be honest, I do not think building a programmer is a very
good exercise for learning electronics. To interface the PIC
with outside world will be more rewarding.
Regards,
Xiaofan
