AD7770 Transfer function

Hi Abishek

The following function is the one I am currently using and it seems to work properly.  

ref= value of the reference

raw_code= the 24bits data

voltage= pointer where the calculated voltage is stored.

void ad7771_data_to_voltage(double ref, uint32_t *raw_code, double *voltage)
{
if((*raw_code <= 0x7FFFFF) && (*raw_code >= 0x00))
{
*voltage = (double)(*raw_code * (ref/16777216.0));
}
else
{
*voltage = (double)((*raw_code * (ref/16777216.0))-ref);
}
}

XLS

This excel file will help you calculate the voltage. You only need to insert in the blue cell the value read from the ADC.

Regards

Joan

XLS

This excel file will help you calculate the voltage. You only need to insert in the blue cell the value read from the ADC.

Regards

Joan