As an additional reference, check:
http://focus.ti.com/lit/an/slaa074/slaa074.pdf
(Controlling the DCO Frequency of the MSP430x11x)
which provides a calibration routine that uses the higher stability
crystal to compensate the DCO frequency error.
It is well known that the two dominant aspects that
Hi,
I would think so. If you use just the DCO, without any calibration,
the error will be very high.
>From datasheet numbers for MSP430F1611:
Temperature sensitivity is about 0.38% / degC (from a nominal at 25 degC) at 3V.
Voltage sensitivity is about 5% / V.
Since the frequency vs temperature a
Hello Zainul,
Thanks for your reply. You said that the freq error (worst case) for the 32
Khz crystal is 40 ppm. What if we use the internal DCO ? will our internal
freq error go up ?
Thanks,
Somnath
On Sat, Oct 18, 2008 at 3:35 PM, Zainul M Charbiwala <[EMAIL PROTECTED]>wrote:
> Hi Somnath,
>
Hi Somnath,
The main clock on the Telos motes runs on an internal DCO which has a
lot of frequency error (could be on the order of 10%), unless the
error is corrected through periodic recalibration with the crystal.
I believe the timers are run off the 32KHz crystal in TinyOS, which
would lead to
Hello ,
People who have worked on time synchronization, can anyone please tell me
that -
Can we say that there is a maximum upper bound on the amount of drift of the
clocks of Telos like platforms ?
Thanks,
Somnath Mitra
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