[time-nuts] FE-.5680A trimming resolution
djl at montana.com
Tue Jan 31 16:05:55 EST 2012
If you are willing to use external counters:
Dallas DS2423 Dual 32-bit Counter
Or, if you have an unlimited budget:
the word "defense" is prominent here :-).
Or counter products from: http://www.lsicsi.com/
I use encoder interfaces from the last company and recommend them!
> On Tue, 31 Jan 2012 21:06:04 +0100
> Javier Herrero <jherrero at hvsistemas.es> wrote:
>> El 31/01/2012 20:43, Attila Kinali escribiÃ³:
>> > My current progress is that the uC i wanted to use does not do what
>> > want. Can anyone recommend a uC with 32bit timers and IEEE 1588
>> You can have a look on these
>> Some of them have IEEE-1588, like the LM3S9B96
> This was exactly the device i intended to use.
> But it doesnt really have 32bit timers. They cascade two 16bit timers
> to get 32bit, but then all kind of restrictions apply which make the
> timers unusable. And when using 16bit timers, i'll get an overflow
> every 800us (at 80MHz clock).
> I browsed trough the internets and could find the following devices:
> LPC18xx (NXP):
> Look nice, but still in development or early production.
> I especially like that they (will be) are available in a 200 pin QFP.
> This would enable to use all the functions of the chip while still
> being able to solder one by hand.
> K60 (Freescale): Hell of a confusing documentation. Also quite new.
> Have only 16bit timers. A big issue is that they have a crypto unit
> on chip, which makes them export restricted. Ie the only way to buy
> them is from a local distributor which makes them expensive.
> STM32-F2/F4 (ST): ST doesn't want to give me the documentation to those.
> (website fails w/o error message)
> I havent found any other chips yet. Sofar the options i see are:
> * wait for the LPC18xx become available in quanities (can take a year)
> * Use a LM3S9B96 together with a small FPGA to implement the counter
> Any hints appreciated
> Attila Kinali
> Why does it take years to find the answers to
> the questions one should have asked long ago?
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