This question probably asked here many times:
P16Pro40 programmer:
works just fine with 16F628 and 12F675
Can't get it to work with 16F870 (tested 2 different chips)
Voltage 12.95V, no spikes.
Checked with 2 different software packages.
Any ideas?
Also, can a low voltage programming mode be used for 16F870 with P16PR40?
This question probably asked here many times:
P16Pro40 programmer:
works just fine with 16F628 and 12F675
Can't get it to work with 16F870 (tested 2 different chips)
No I did not program any large chips, I have now only few 16F870 chips, rest of them small.
Yes it does require Vpp40 and I see different LED coming up and I see 12.95V on pin 1.
I checked spec on 16F87x and programming voltage is 13+/- .5V
It is little higer than voltage spec for 16F628 and 12F675 (12-13V)
Should I try to bump Vpp40 voltage to 13.5 or it may damage rest of chips?
Also I will try to replace transistor on Vpp40 line.
No I did not program any large chips, I have now only few 16F870 chips, rest of them small.
Yes it does require Vpp40 and I see different LED coming up and I see 12.95V on pin 1.
I checked spec on 16F87x and programming voltage is 13+/- .5V
It is little higer than voltage spec for 16F628 and 12F675 (12-13V)
Should I try to bump Vpp40 voltage to 13.5 or it may damage rest of chips?
Also I will try to replace transistor on Vpp40 line.
13.5V shouldn't cause any problems, but I've never had any problems with P16PRO40's like this. I've never had a 16F870 to try, but I've used 16F876 and 16F877 without any problems.
Did you build the programmer from a kit (with a PCB) or did you build it from scratch yourself?.