Post by thread:Pickit 2 In circuit programming

Hi, I just finished finished putting together my first in-circuit programmable PCB board and my first circuit with any 18f series chip. However, when I plugged my Pickit 2, it could not find the chip. Did check my soldering and I think all the connections are good. Now I am wondering if I made a mistake with how I connected the ICSP jack. This i166.photobucket.com/albums/u83/adasta/usbrocketschematic.png is the schematic. Does this look right? Thanks for any help. Cheers, Adam

Adam Stambler spam_OUTadastaTakeThisOuTgmail.com wrote: >Hi, I just finished finished putting together my first in-circuit >programmable PCB board and my first circuit with any 18f series chip. >However, when I plugged my Pickit 2, it could not find the chip. Did check >my soldering and I think all the connections are good. >Now I am wondering if I made a mistake with how I connected the ICSP jack. >This i166.photobucket.com/albums/u83/adasta/usbrocketschematic.png >is the schematic. Does this look right? >Thanks for any help. >Cheers, >Adam The 330ohm pullup on the MCLR line is way too low, should be a 27k or so It's a little confusing to use VCC and VDD for the same wire. for the rest it looks good TTYL Peter van Hoof

Hmm. I was just looking over my circuit and realized I used a PIC 18LF4450 instead of the PIC 18F4550 that I should have. (ARG!!!!!) Could that be causing my programming problems? Can the pickit 2 handle an LF part? I am not even sure what that L means. Thanks again, Adam On 3/15/07, Peter van Hoof <.....pvhoofKILLspam@spam@yahoo.com> wrote: {Quote hidden}> > Adam Stambler adastaKILLspamgmail.com wrote: > >Hi, I just finished finished putting together my first in-circuit > >programmable PCB board and my first circuit with any 18f series chip. > > >However, when I plugged my Pickit 2, it could not find the chip. Did > check > >my soldering and I think all the connections are good. > > >Now I am wondering if I made a mistake with how I connected the ICSP > jack. > > >This i166.photobucket.com/albums/u83/adasta/usbrocketschematic.png > >is the schematic. Does this look right? > > >Thanks for any help. > > >Cheers, > >Adam > > The 330ohm pullup on the MCLR line is way too low, should be a 27k or so > It's a little confusing to use VCC and VDD for the same wire. > for the rest it looks good > > TTYL > Peter van Hoof > > -

The 'L' is for low power. I believe the programming specs are the same. -n. -----Original Message----- From: "Adam Stambler" <.....adastaKILLspam.....gmail.com> To: "Microcontroller discussion list - Public." <EraseMEpiclistspam_OUTTakeThisOuTmit.edu> Sent: 3/15/2007 10:27 PM Subject: Re: Pickit 2 In circuit programming Hmm. I was just looking over my circuit and realized I used a PIC 18LF4450 instead of the PIC 18F4550 that I should have. (ARG!!!!!) Could that be causing my programming problems? Can the pickit 2 handle an LF part? I am not even sure what that L means. Thanks again, Adam On 3/15/07, Peter van Hoof <pvhoofspam_OUTyahoo.com> wrote: {Quote hidden}> > Adam Stambler @spam@adastaKILLspamgmail.com wrote: > >Hi, I just finished finished putting together my first in-circuit > >programmable PCB board and my first circuit with any 18f series chip. > > >However, when I plugged my Pickit 2, it could not find the chip. Did > check > >my soldering and I think all the connections are good. > > >Now I am wondering if I made a mistake with how I connected the ICSP > jack. > > >This i166.photobucket.com/albums/u83/adasta/usbrocketschematic.png > >is the schematic. Does this look right? > > >Thanks for any help. > > >Cheers, > >Adam > > The 330ohm pullup on the MCLR line is way too low, should be a 27k or so > It's a little confusing to use VCC and VDD for the same wire. > for the rest it looks good > > TTYL > Peter van Hoof > > -

Adam Stambler KILLspamadastaKILLspamgmail.com wrote: >To: Microcontroller discussion list - Public. <RemoveMEpiclistTakeThisOuTmit.edu> >Sent: Thursday, March 15, 2007 10:27:00 PM >Subject: Re: Pickit 2 In circuit programming >Hmm. I was just looking over my circuit and realized I used a PIC 18LF4450 >instead of the PIC 18F4550 that I should have. (ARG!!!!!) >Could that be causing my programming problems? >Can the pickit 2 handle an LF part? I am not even sure what that L means. >Thanks again, >Adam According to the latest MPlab pickit2 readme (7.52 interrim release) no 18f devices are supported at all!! LF means the chip was tested for a wider operating voltage range on the low side, and being able to run at a higher clockspeed for a given operating voltage. Peter van Hoof

For Pickit 2, I was going by this list: http://www.microchip.com/stellent/idcplg?IdcService=SS_GET_PAGE&nodeId=1406&dDocName=en027813 This says that most actually are. I tried reinstalling my Pickit software thinking I had an older verison, but it still gives me that same error. No device attached or no supported device. Are there any common PCB board mistakes that I should search for? I checked all the connections with a multimeter and they seem to all be going to the right places. Thanks again, Adam On 3/15/07, Peter van Hoof <spamBeGonepvhoofspamBeGoneyahoo.com> wrote: {Quote hidden}> > Adam Stambler TakeThisOuTadastaEraseMEspam_OUTgmail.com wrote: > >To: Microcontroller discussion list - Public. <RemoveMEpiclistTakeThisOuTmit.edu> > >Sent: Thursday, March 15, 2007 10:27:00 PM > >Subject: Re: Pickit 2 In circuit programming > > > >Hmm. I was just looking over my circuit and realized I used a PIC > 18LF4450 > >instead of the PIC 18F4550 that I should have. (ARG!!!!!) > > >Could that be causing my programming problems? > > >Can the pickit 2 handle an LF part? I am not even sure what that L > means. > > >Thanks again, > >Adam > > According to the latest MPlab pickit2 readme (7.52 interrim release) no > 18f devices are supported at all!! > > LF means the chip was tested for a wider operating voltage range on the > low side, and being able to run > at a higher clockspeed for a given operating voltage. > > Peter van Hoof > > -

I have to correct myself here The pickit2 software can do a lot more devices than the current mplab release including the 18(L)F4550 and 18(L)F4450 Peter >Peter van Hoof pvhoofEraseME.....yahoo.com wrote: >According to the latest MPlab pickit2 readme (7.52 interrim release) no 18f devices are supported at all!!

> This i166.photobucket.com/albums/u83/adasta/usbrocketschematic.png > is the schematic. Does this look right? Someone has already called out that your pullup on VPP/MCLR is WAY WAY too strong. During first time programming before you get LVP disabled you may need to tie PGM low. One of your pics VDD pins (pin 28) doesn't appear to be actually connected to the VDD net Those are the only problems i can spot on a quick check over the cuircuit.

I still have not gotten it working.... Does anyone have a schematic and board for 40 pin pic Pickit2 programming adapter? I am screwing something up consistently. Maybe if i see/use someone else's I will be able to get it to work. Thanks again, Adam On 3/16/07, peter green <EraseMEplugwashp10link.net> wrote: {Quote hidden}> > > This i166.photobucket.com/albums/u83/adasta/usbrocketschematic.png > > is the schematic. Does this look right? > Someone has already called out that your pullup on VPP/MCLR is WAY WAY too strong. > > During first time programming before you get LVP disabled you may need to tie PGM low. > > One of your pics VDD pins (pin 28) doesn't appear to be actually connected to the VDD net > > Those are the only problems i can spot on a quick check over the cuircuit. > > > > -