Hi Johnson-san, Thank you for your reply. [quote userid="404787" url="~/support/microcontrollers/msp-low-power-microcontrollers-group/msp430/f/msp-low-power-microcontroller-forum/1049596/msp430fr5733-internal-resistance-values-of-p1-0-and-p1-3/3884386#3884386"]How to measure this value? Power off and using voltage meter(one probe is GND, one probe is P1.0/P1.3)?[/quote] The customers use a voltage meter to connect to GND and P1.0 /P1.3 for measurement. [quote userid="404787" url="~/support/microcontrollers/msp-low-power-microcontrollers-group/msp430/f/msp-low-power-microcontroller-forum/1049596/msp430fr5733-internal-resistance-values-of-p1-0-and-p1-3/3884386#3884386"] This should be input impedance. I don't have FR5733, but I have been measured in FR5739 Lanuchpad, the input impedance of P1.0 & P1.3 is all about 2.9MR. [/quote] I think the terminals will be high impedance. I will also measure using FR5739 Launchpad. Best regards, Sasaki
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