The table titled "internal RC accuracy" in the datasheet specifies a typical 0.15% deviation, but a worst case 1% across the temperature range. USB's nominal requirement is 0.25%. So if you want to be 100% certain you'd need to add a crystal to the circuit (and make a configuration flag change in the bootloader). Otherwise, you can characterize it yourself and see how bad it actually gets.
On Fri, Jul 8, 2016 at 5:18 PM, Pranay Sharma <[email protected]> wrote: > HI Ytai, > I checked the data sheet of the PIC micro used in IOIO board but I am not > able to figure out which graph to see to understand the oscillators > behaviour to temprature changes. > Further, is there a link to exact BOM of the parts used for IOIO with > exact part names? > Thanks for your time > > On Friday, July 8, 2016 at 6:56:40 AM UTC+5:30, Ytai wrote: >> >> I haven't done any work to characterize the temperature range or design >> for a specific one. You'd have to do that be checking the datasheets of the >> individual parts. I'm assuming that 85C should be safe for most if not all >> parts. Another thing you'd need to evaluate is how stable the internal >> oscillator of the PIC is across the temperature range. USB is pretty picky >> about the precision of its clock. >> >> On Wed, Jul 6, 2016 at 12:59 PM, Pranay Sharma <[email protected]> >> wrote: >> >>> Dear ALL, >>> Could someone put some light on what are the temperature ranges for >>> proper operation of the IOIO board. >>> >>> I was thinking to use this board for a product which would be put >>> outdoors where maximum temperature in summers is 45Deg Celcius. >>> So the expected temperature inside the board could easily reach 55deg or >>> 60Deg. >>> >>> BR >>> Pranay >>> >>> -- >>> You received this message because you are subscribed to the Google >>> Groups "ioio-users" group. >>> To unsubscribe from this group and stop receiving emails from it, send >>> an email to [email protected]. >>> To post to this group, send email to [email protected]. >>> Visit this group at https://groups.google.com/group/ioio-users. >>> For more options, visit https://groups.google.com/d/optout. >>> >> >> -- > You received this message because you are subscribed to the Google Groups > "ioio-users" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To post to this group, send email to [email protected]. > Visit this group at https://groups.google.com/group/ioio-users. > For more options, visit https://groups.google.com/d/optout. > -- You received this message because you are subscribed to the Google Groups "ioio-users" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at https://groups.google.com/group/ioio-users. For more options, visit https://groups.google.com/d/optout.
