Philippe wrote:
>
> At 09:38 07/04/1997 +0200, you wrote:
> >>
> >> At 09:02 07/04/1997 +0200, you wrote:
> >> >Hi,
> >> >
> >> >        Is there anybody that's able to help me about the temp sensor from
> >> >Dallas: DS1620? I am trying to find out if it is doing self
> >> >thermostating while in CPU mode (3wire interface). Can anybody help.
> >> >Thanks a lot.
> >> >
> >> Dowload the DS1620 datasheet at DALLAS URL, the data sheet is very
 complete:
> >>         http://www.dalsemi.com/DocControl/PDFs/pdfindex.html
> >--
> >        I already got this, but in fact they don't tell if the sensor is
 doing
> >temp. regulation when in CPU mode. They also have an example of
> >communication between DS1620 and CPU, but they don't wait 10ms between
> >each write to TH or TL register, nor CONFIG. What am I supposed to
> >understand?
>
> This is what the data sheet said:
>
> NVB = Nonvolatile Memory Busy Flag.
> 1=write to an E 2 memory cell in progress.
> 0=nonvolatile memory is not busy.
> A write to E 2 may take up to 10 ms.
>
> I think better is to test the BIT NVB in CONFIGURATION/STATUS REGISTER
> before doing something else. This chip seems to have a RAM copy
> of the EEPROM section (like NOVRAM).
>
> In all case writing into an EEPROM take a certain time, this is due
> to physical matter and charge accumulation, then, it's normal to wait
> about 10ms before EEPROM is wrote correctly.
> Best way is to test NVB bit until wrote is completed, or in the
> worst case to wait 10ms.
> Note 10ms is a maximum, at the begining it will take 2ms for example
> and after 10.000 write operations it will take 9,9ms.
>
> Regards,
>         Philippe.
>
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        Ok, mais est-ce que ce foutu capteur joue au thermostat lorsqu'il est
en mode CPU? Est-ce que tu as du code pour un PIC afin de le controler?
Merci.
--

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