Why would you use an external oscillator as opposed to just an external crystal?
On Dec 22, 2016 7:17 AM, "P.S" <[email protected]> wrote: > Dear Ytai and All, > We were choosing http://www.mouser.com/ds/2/96/008-0256-0-786323.pdf to > be used as an external oscillator. > Any comments or suggestions? > Best Regards > > On Friday, 9 December 2016 05:00:57 UTC+5:30, Ytai wrote: >> >> No special tips. Just make sure every component you use is rated for this >> range and that its critical parameters within the desired range across the >> temperature range you want to support. >> >> On Dec 7, 2016 11:55 PM, "P.S" <[email protected]> wrote: >> >>> Dear Ytai, >>> I will be starting to make a version of IOIO with Crystal and opensource >>> it. Any tips with respect to hardware/software design so that the board can >>> withstand higher ambient temperature? >>> >>> Thanks in advance >>> >>> >>> On Saturday, 9 July 2016 01:00:24 UTC+5:30, Ytai wrote: >>>> >>>> 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. >>> >> -- > 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.
