[oopic] Re: Power On Led

--- In oopic@yahoogroups.com, "Samitha Ransara" <samitharansara@...>
wrote:
>
> Hello,
> I have a OOPic R.The problem is the power on LED is not flashing when I
> connect it to the supply. But it aknowledgse to compiler, and I can
program
> it. What may be the problem?
>
> Thanks a lot..
>
> Sam

It isn't a Power On LED... It is connected to the clock signal for
the EEPROM. I would expect it to be dim but I'm not sure you can see
distinct blinking. I'm not certain of this because I don't have an R
board.

If you don't even see a dim LED, perhaps it is defective. Check the
clock signal with a scope to get an idea of the duty cycle. I would
be very interested in seeing the signal at the junction of the LED
cathode and the 2.7k resistor. If the LED is defective, the 2.7k
resistor may not be pulling the clock signal high as it should.

Richard

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