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louwi_138
Joined: 17 Nov 2012
Posts: 23
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| Running pic18f452 with 3.3V ; CCS PCB 4.110 |
 Posted: Wed Oct 30, 2013 9:47 pm |
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Hello,
I'm trying to run my pic with voltage 3.3V. I'm wondering if there is anything to add in the code before using it with 3.3V. |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19498
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| Posted: Thu Oct 31, 2013 3:11 am |
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No. Just change the PIC......
Read the data sheet. The 18F452, _minimum_ operating voltage is 4.2v.
The 18LF452 (note the extra character), is rated to run to about 25MHz at this voltage, but the 452, is not.
Best Wishes |
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louwi_138
Joined: 17 Nov 2012
Posts: 23
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| Posted: Thu Oct 31, 2013 3:44 am |
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| Ttelmah wrote: | No. Just change the PIC......
Read the data sheet. The 18F452, _minimum_ operating voltage is 4.2v.
The 18LF452 (note the extra character), is rated to run to about 25MHz at this voltage, but the 452, is not.
Best Wishes |
so what they mean by :
• Wide operating voltage range (2.0V to 5.5V)
that was mentioned in the datasheet of the pic 18f452 at the end of the 3rd page. |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19498
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| Posted: Thu Oct 31, 2013 4:08 am |
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The data sheet is for the _family_. 18Fxx2, and 18LFxx2. Telling you what features you _can_ have if you get the right variant. The point is if you look at the back of the sheet, the low voltage part only applies if you have the low voltage chip. This is what the 'LF' signifies.
The same is true of things like the temperature range. There are different variants, -I, and -E, for the industrial and extended temperature ranges.
Similarly with how many pins the package has. /P, is a PDIP package, /L a TQFP package and /PT a PLCC package.
You always need to look at the full individual device specification, not 'family summary' pages....
Best Wishes |
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