I am using ADS1115 with Arduino Micro with differential mode between pin A0 and A1.
I have connected A1 to ground. Since A0 can be either positive or negative from a sensor but between -200mV to +200mV.
I have Vdd=5V and PGA gain set at 16x.
What is the maximum voltage level that can be connected at A0 pin ?
Can A1 be connected to ground in differential mode ?
It was working good before. But suddenly Arduino fails to initialize ADC.
Read the data sheet, particularly the absolute maximum rating section. You cannot have a negative input more than gnd-0.3V. The difference between inputs can be negative as long as the inputs are between gnd-0.3 and Vdd+.03. I don't know how it behaves at those limits - it may work or it may just not blow up.
For useful operation, the voltage on all inputs to the ADS1115 must between 0 and the ADS1115 power supply voltage.
You will need an op amp level shifter to read the sensor output using either the ADS1115 or the Arduino ADC.
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