Pic16F15313 LFINTOSC Accuracy

Enhanced mid-range devices. PIC12F1xxx and PIC16F1xxx

Pic16F15313 LFINTOSC Accuracy

Postby birghtnight » Tue Mar 22, 2022 9:02 pm

I’m using the PIC16F15313 and I need to understand how much the clock will vary over time and how accurate it is over temperature. I haven’t been able to find this information about the internal 31kHz oscillator (LFINTOSC) in the datasheet.

Datasheet: https://www.mouser.com/datasheet/2/268/PIC16_L_F15313_23_Data_Sheet_40001897-2930305.pdf

My goal is two have two PIC15F15313 communicating wirelessly outdoors using IR LED’s and receivers with each chip shutting off in between pulses to save power and waking up just before it expects to see a pulse. Since both of them will experience close to the same temperatures I’m not sure if I can expect them to experiences the same drift or if I really need something more accurate. I also don’t have a sense for how accurate I need to be but this is a battery powered system so power savings is critical. I'm aiming to create pulses of 200us using the PWM port at 20Hz so I might be able to shut off between pulses to save power if it makes sense to do so.
birghtnight
 
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Joined: Wed Mar 09, 2022 1:29 am

Re: Pic16F15313 LFINTOSC Accuracy

Postby Roche » Fri Mar 25, 2022 9:14 am

Bob Pease's comment that his favourite programming language is solder might hold true here. Build some and measure drift over temperature.
Also maybe refer to Jack Gansles excellent report on low power systems, where he laments the failings of data sheets.
Roche
 
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Joined: Fri Jul 11, 2014 12:35 pm
PIC experience: Professional 5+ years with MCHP products


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