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

[cbobek]

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

[Hui_Ma]

Hi

The KL26 product most GPIO pin default status is "DISABLED", which is in high impedance status

If VDD & VDDA voltage is 0V, customer can apply up to 3.3 V voltage connected to GPIO pin.

If connected voltage is lower than 3.6V, it will not damage Kinetis product.

Thank you for the attention.

Have a great day,
Ma Hui

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