ok title is naff,
but as the pickit2 circuit has a variable voltage converter, just what I needed for a project, but changers would be needed.
I thought I would build one out of my junk box. the reason being if I did not have the part, redesign for parts I did have.
build went well. it was done in stages, 20 Mhz Osc, "usb A" socket (not the mini-B),the leds. I left off the 24lc512 as they are not being used at this time.
I used a 18F4550 as one was to hand. pc seen it as a pickit2 and reported power supply was at fault. (well most parts where not fitted)
.
Next I added the VDD TGT ADJ , op-amp and Q1, the VPP Voltage pump and all the components up to ICSP J3 pin 1. (VPP)
as the only Inductor I had was 100uH (680uH on the pickit2) I took the wire off it counting the turns, and rewound it with a smaller wire gauge x7 the original turns. (I think this is out as the voltage on VPP is some times reported as low in the Tools Troubleshoot Screen) also my meter reads low 7V.
As of now I can auto detect and program 16F628-04 on run programs on low pin count demo board. (some times it says Device Not Present - to fix this I download Pickit2 Firmware and it sees it again after Pickit2 is reset)
When I use a 16F690 I get Unsupported Part (ID=FFE0), I think I need to work on the Inductor to get the voltage right.
Has Anyone else had a go with this yet.
Regards Art
but as the pickit2 circuit has a variable voltage converter, just what I needed for a project, but changers would be needed.
I thought I would build one out of my junk box. the reason being if I did not have the part, redesign for parts I did have.
build went well. it was done in stages, 20 Mhz Osc, "usb A" socket (not the mini-B),the leds. I left off the 24lc512 as they are not being used at this time.
I used a 18F4550 as one was to hand. pc seen it as a pickit2 and reported power supply was at fault. (well most parts where not fitted)
.Next I added the VDD TGT ADJ , op-amp and Q1, the VPP Voltage pump and all the components up to ICSP J3 pin 1. (VPP)
as the only Inductor I had was 100uH (680uH on the pickit2) I took the wire off it counting the turns, and rewound it with a smaller wire gauge x7 the original turns. (I think this is out as the voltage on VPP is some times reported as low in the Tools Troubleshoot Screen) also my meter reads low 7V.
As of now I can auto detect and program 16F628-04 on run programs on low pin count demo board. (some times it says Device Not Present - to fix this I download Pickit2 Firmware and it sees it again after Pickit2 is reset)
When I use a 16F690 I get Unsupported Part (ID=FFE0), I think I need to work on the Inductor to get the voltage right.
Has Anyone else had a go with this yet.
Regards Art
