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Can voltage be applied to GPIO pins on un-powered device for KL26 family?

Question asked by Chris Bobek on Sep 11, 2015
Latest reply on Sep 14, 2015 by Hui_Ma

Hi,

 

In our design it is possible for 3.3V to be applied to several GPIO pins before the KL26 is powered.  I believe there is a discrepancy in the KL26 datasheet regarding the presence of voltage on GPIO pins of an un-powered device.

 

The KL26P121M48SF4 datasheet states:

Table 4 "Voltage and current operating ratings" --  Vio(max) = VDD + 0.3V.

Table 5 "Voltage and current operating requirements" note 1 -- states there is no esd diode to VDD and no current limiting resistor is required for voltages above VSS.

 

I read similar questions for other Kinetis devices and believe the part is capable of safely and reliably handling voltages on un-powered device pins, but I need to be sure the same is true for the KL26.

 

Our device is the MKL26Z128VLL4.

 

Thank you,

 

Chris

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