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I setup the PSoC 62S4 Kit ADC , with 2 channels as singled end, Vref=VDDA, Vminus=VSSA. When feed the Vplus with known signal (or voltage) , the voltage readings of the two channel is ok and as expected. When I disconnected the signal, i.e. the Vplus open ended, I got reading (as calculated) is fixed as 2.8V . Is this normal? As I thought an open-ended Vplus will get varying readings from time to time, or at least the level is not so high.
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PSoC 6 MCU
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Hi,
As the floating pin could get influenced numerous other factors which could dependent on the schematic, routing, voltages on adjacent pins and routes etc it will be difficult to tell the voltage read on a floating pin. But you could check giving a known voltage on the ADC input from VSSA-VDDA as input to the ADC and see if they are properly getting converted. You can confirm whether the ADC is working as expected from this.
Best Regards,
Vasanth
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Hi,
As the floating pin could get influenced numerous other factors which could dependent on the schematic, routing, voltages on adjacent pins and routes etc it will be difficult to tell the voltage read on a floating pin. But you could check giving a known voltage on the ADC input from VSSA-VDDA as input to the ADC and see if they are properly getting converted. You can confirm whether the ADC is working as expected from this.
Best Regards,
Vasanth