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'Dallas Temp sensor.'
1997\04\07@030859 by David BALDWIN

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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.

-david

1997\04\07@033222 by Philippe

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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.
>
>-david

Dowload the DS1620 datasheet at DALLAS URL, the data sheet is very complete:
       http://www.dalsemi.com/DocControl/PDFs/pdfindex.html

Best regards,
       Philippe.

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1997\04\07@034501 by David BALDWIN

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Philippe wrote:
{Quote hidden}

--

       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?

 _____________
 \           /               David BALDWIN
  \ ALCATEL /               Design engineer
   \TELECOM/
    \     /         SdM (Societe de Microelectronique)
     \   /
      \ /      B.P. 4205            Phone : +32 (0)71 442932
       V       B-6000 Charleroi     Fax   : +32 (0)71 442905
               (Belgium)            baldwinspamKILLspametca.alcatel.be

1997\04\07@050427 by Philippe

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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:
>>         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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 | Try UMPS: the best microcontroller simulator            |
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1997\04\07@051921 by David BALDWIN

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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:
> >>         www.dalsemi.com/DocControl/PDFs/pdfindex.html
> >--
> >        I already got this, but in fact they don't tell if the sensor is
doing
{Quote hidden}

       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.
--

 _____________
 \           /               David BALDWIN
  \ ALCATEL /               Design engineer
   \TELECOM/
    \     /         SdM (Societe de Microelectronique)
     \   /
      \ /      B.P. 4205            Phone : +32 (0)71 442932
       V       B-6000 Charleroi     Fax   : +32 (0)71 442905
               (Belgium)            baldwinspamspam_OUTetca.alcatel.be

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