Low voltage "LF" chips can be used as normal ?

kaps123 · Joined: 26 Jul 2009 Posts: 2

Dear All,

I Need Help!

I want to know whether the chips designated "LF" (low voltages devices, Example :PIC18LF2580 ) can be used as normal "F" designated chips (Example: PIC18F2580). I know the vice-versa is not true. Whether all the ports, I2C, SPI, SERIAL and so on, etc. of "LF" chips function as standard "F" chip at +5. I mean are there any restrictions or limitations? Can I replace PIC18F2580 from the circuit and use PIC18LF2580 at + 5V ? I searched the datasheet but didn't find anything important regarding this.....

Thanks
Amit

bungee- · Joined: 27 Jun 2007 Posts: 206

You can. If F version of chip works, the LF version will too. Wink

dyeatman · Joined: 06 Sep 2003 Posts: 1934 Location: Norman, OK

If you are using Brownout you likely need to change the BOR level setting.
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magestik · Joined: 16 Oct 2008 Posts: 59

It's written on page 8 (1.3) of the datasheet.

"F" accomodate an operating VDD range of 4.2V to 5.5V.
"LF" function over an extended VDD range of 2.0V to 5.5V.

There are frequency restrictions, see figure (28-1) on page 358.

Ttelmah · Guest

On most chips, the 'LF', is identical to the standard version, except with a warranted extended voltage range. Frequency limitations at the lower end, but otherwise identical.
There are a few recent chips though, where actual operational differences exist. Commonly with the ADC.
The data sheet is your friend.
The 2580, doesn't have such a problem.

Best Wishes

kaps123 · Joined: 26 Jul 2009 Posts: 2

Thank You so much ....