Re: Temperature rating of IoIo Board

2016-12-22 Thread Ytai Ben-Tsvi 
Why would you use an external oscillator as opposed to just an external
crystal?

On Dec 22, 2016 7:17 AM, "P.S"  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"  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 
 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 <
>> pra...@tollmequick.com> 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
>>>
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>>
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Re: Temperature rating of IoIo Board

2016-12-22 Thread P.S 
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"  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  
>>> 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  > 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 ioio-users+...@googlegroups.com.
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>> Visit this group at https://groups.google.com/group/ioio-users.
>> For more options, visit https://groups.google.com/d/optout.
>>
>
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>>>
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>>
>

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