It's certainly possible to give the raw byte sequence. There is a slight
wrinkle that the DS2450 does A/D conversion either 0-2.5V or 0-5V and we use
the requested property to transparently set the correct resolution.
>From modules/owlib/src/c/ow_2450.c:
// data conversions
f[0] = (resolution ? 7.8126192E-5 : 3.90630961E-5) * ((((UINT) data[1])
<< 8) | data[0]);
f[1] = (resolution ? 7.8126192E-5 : 3.90630961E-5) * ((((UINT) data[3])
<< 8) | data[2]);
f[2] = (resolution ? 7.8126192E-5 : 3.90630961E-5) * ((((UINT) data[5])
<< 8) | data[4]);
f[3] = (resolution ? 7.8126192E-5 : 3.90630961E-5) * ((((UINT) data[7])
<< 8) | data[6]);
Are you using a platform where floating point arithmetic is inconvenient?
I'm told the true resolution is only 8 bit even though 16bit is set, so
rounding errors are probably irrelevant.
If you want the raw reading, can you suggest a good name? A2D ? raw_read?
Paul Alfille
On Thu, May 1, 2008 at 4:25 PM, Alessio Sangalli <[EMAIL PROTECTED]> wrote:
> Hi, I am using a DS2450 to control voltages.
>
> I use a voltage divider, 33K + 10K resistors and measure the voltage in
> the middle to measure up to about 20V.
>
> I have to calibrate each ADC to get an accurate reading depending on the
> real value of the resistors.
>
> In this operation I would be more comfortable to use the raw 16bit
> reading from the sensor, is it possible to have it available or the
> DS2450 just sends the voltage reading?
>
> bye thank you
> Alessio
>
>
>
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