Mecanique's internal bootloader OSC

[Bruce]

Charles,

We have chamber-tested random units at -40C and 100C, about 30 units total.

Were you testing this by boot-loading with the internal osc and a serial loader, or just testing to see if the PIC failed at these temps?

If so - which PIC were you using? I've had problems in Colorado when the temperature fell below freezing with serial loaders using the internal osc. And more when the board was in an enclosure exposed to direct sun.

Just curious. That's pretty good if you were boot-loading with a serial loader using the internal osc at these temperatures.

[Charles Linquis]

Charles,


Were you testing this by boot-loading with the internal osc and a serial loader, or just testing to see if the PIC failed at these temps?

If so - which PIC were you using? I've had problems in Colorado when the temperature fell below freezing with serial loaders using the internal osc. And more when the board was in an enclosure exposed to direct sun.

Just curious. That's pretty good if you were boot-loading with a serial loader using the internal osc at these temperatures.

We were not actually boot-loading at those temps. We were, however, continuously doing serial I/O at 19,200 baud. No problems. Note that we were using 18LF2321's at 5V.
Many years ago, I found that some other chips (in the 16F series) were not nearly so accurate - or stable.

[Bruce]

Thanks Charles. I'll have to try an 18F part. I had tested this with 16F types. Never thought there would be that much difference with the internal osc on an 18F type, but I will test it. Solid comms with the internal osc at those temps is pretty amazing.

[Charles Linquis]

Different parts have different tolerances on the oscillator. Some of the newer 18F parts are really good.

[SUNFLOWER]

Received email from Mecanique --

Hi

We only supply loader hex with external OSC. You might want to take a look at

http://mrmackey.no-ip.org/elektronik/ds30loader/

which may better meet your needs...

regards



Open source "ds30 loader" PIC bootloader supporting PIC16, PIC18, PIC24, and dsPIC