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MSP-TS430RHB32A: About the current output from ADC

Part Number: MSP-TS430RHB32A

Dear all


I'm sending a file which includes our measurement results, the configurations and our source code.

According to the results, ADC seems to output current. What kind of causes can you think of?



A: When we connect A1.0+ and GND by a resistor, the value of ADC changes depending on the resistor value.


B:When we connect A1.0+ and GND , and between A 1.0- and GND by each a resistor,

the difference of ADC value when we use resistors or just short seems to be in proportion to Vin.

Even when measuring the ADC input with an external measuring instrument,

there was a difference in voltage value depending on the presence or absence of resistance.

I guess it is due to the leakage current of the protection diode, what do you think?

We'd like to use this chip for our development though, our customer says until we figure out the reason clearly, they can't use this for their mass production.


Best regard,

Megumi Nishi

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