Hello,
I'm trying to interface a current sensor with voltage output to the ADC on the F2812 DSP. Although the User Guide specifies an analog input range, there aren't any guidelines or warnings about exceeding this range.
I have a sensor that gives a +/- 4V output for the nominal measuring range (+/- 50A). The current will be a large positive DC with an AC component, so I am planning on converting only a 0-4V sensor swing to a 0-3V signal. My questions are below:
1. Is there any automatic offset in the ADC? i.e., if I fed it a +/- 1V signal, would it rescale to something like 0.5V to 2.5V?
2. Since I am assuming that the sensor will never provide a negative value, what is the effect if it does and the ADC input drops below 0V during a failure or other event?
3. What happens if the current rises above the expected maximum value during a transient? i.e., the current sensor can measure up to +/- 150A corresponding to a much larger sensor output swing; does the ADC saturate, or will it be destroyed if a value over 3V is presented?
Thanks,
Nick
