Re: [ts-7000] TS-7260 ADC calibration values

[Clark Dunson <>]

Once again Don, you and I are near the same place in development.  I checked

the memory map for the TS-7250, and it looks like what TS did is keep the map

the same, best they could, so these addresses match between 7250 & 7260.

Like you, I got -718.8 volts on one unit and -758 on another.  I noticed that the header file

has a call to write those values.  I'm going to have to try it, because we are

managing a solar charging system.  I have a bandgap supply here that I will

attempt to use on the two open channels as a calibration.  Should be an interesting

afternoon.

best

On Mar 10, 2011, at 12:49 PM, Rekcut_Nod wrote:

 

Is there a way to determine how good the ADC calibration values are, or to recalibrate the ADC?

Running the sample code adc_7250.c, the executable tells me that the board has been calibrated by Technologic Systems, but the voltages reported seem unrealistic (e.g. channel 1 reports as at -708V, and user input 0 reports as at 1.5V when it is grounded).

If I comment out the part of adc_7260.c where it checks if the board has already been calibrated (i.e. force it to NOT use the calibration values), the results seem more realistic (e.g. channel 1 reports as 0.808V and user input 0 reports as 0.08V when it is grounded).

I sent TS a question about this earlier, but have not yet received a response.

Don

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