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Renesas Electronics Europe - Knowledgebase

Unused GPIO with TPS-1

Last Updated:06/01/2017


Can you clarify the recommendation for unused GPIO pins on the TPS-1? Should they be connected to 3.3V via a 10K resistor?


GPIO pins have no internal pull-up or pull-down resistor, so you must connect unused GPIOs to a defined level. We recommend connecting unused GPIOs to Vdd (3.3V) with 10K resistors. You cannot use a single resistor as a pull-up for multiple GPIOs, each GPIO must have its own resistor. From PROFINET stack version V1.4 and later, unused GPIOs can be left open.
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