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'Different Operating Voltage'
2002\08\05@071611 by Keong

picon face
Hi

Currently I am using the PIC12CE518 JW package to do
my development work. The chip is designed to operate
over a voltage range of 3V to 5.5V. I wrote a simple
program to blink two LEDs on two I/O pins on a
breadboard with nothing but the PIC chip and its
supporting circuity connected up. However a strange
observation was made. The chip works fine when
supplied with a 4.5V supply and when the supply is
changed to 3.3V, the LEDs dont blink while one of
the LEDs is lit up permanently. Another observation
made is that when operating on a 3.3V supply, when the
PIC is put to sleep, the oscillation circuit still
operates!

A supply of 3.3V is within the operating range but
does it give a different operating result?

hanks


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2002\08\05@080020 by Alan B. Pearce

face picon face
>The chip works fine when
>supplied with a 4.5V supply and when the supply is
>changed to 3.3V, the LEDs dont blink while one of
>the LEDs is lit up permanently. Another observation
>made is that when operating on a 3.3V supply, when the
>PIC is put to sleep, the oscillation circuit still
>operates!
>
>A supply of 3.3V is within the operating range but
>does it give a different operating result?

This sounds like the brownout detection is enabled. If, like other chips, it
has a voltage setting of about 4 volts, then you will need to disable it to
get down to this operating voltage.

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2002\08\05@130227 by Herbert Graf

flavicon
face
> Currently I am using the PIC12CE518 JW package to do
> my development work. The chip is designed to operate
> over a voltage range of 3V to 5.5V. I wrote a simple
> program to blink two LEDs on two I/O pins on a
> breadboard with nothing but the PIC chip and its
> supporting circuity connected up. However a strange
> observation was made. The chip works fine when
> supplied with a 4.5V supply and when the supply is
> changed to 3.3V, the LEDs dont blink while one of
> the LEDs is lit up permanently. Another observation
> made is that when operating on a 3.3V supply, when the
> PIC is put to sleep, the oscillation circuit still
> operates!
>
> A supply of 3.3V is within the operating range but
> does it give a different operating result?

       I'm not familiar with that chip but that sounds suspiciously like BOD is
enabled (Brown Out Detect). TTYL

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