HelloMay i ask what happens when you put a 1.8V on I.MX6 pin (ONOFF or GPIO) while it is powered off?
Hello Massimo Romano,
You can see some more details of how the Pads operate on the i.MX6 Reference Manual, albeit with not much details on how they are protected for scenarios like this.
Also, would you mind elaborating a bit more on how is your power off scenario? Are you using a PMIC? Is VDD_HIGH present even when the processor is powered off or only SNVS or neither?
HelloWe are totally powered OFF, no SNVS or others, but we use the same GND. We noticed that a current flow trough ONOFF pin if you put a voltage on it. Maybe a clamping diode or other circuit connect this signal to GND.We solved the problem by limiting current with an resistor that doesn't affect on the circuit when it is powered. May this damage the i.mx6?We noticed that input impedance of the ONOFF pad while i.mx6 is totally powered off is 18Kohm (but it depends on voltage, like a kind of pn junction).Regards
Sorry but i ask it again."May this damage the i.mx6?"May a little current flowing through ONOFF pin wile I.MX6 is powered off damage the component?The scenario isI.MX6 has no voltage suorces, only GND pins are connected and a current flows through ONOFF pin, limited with 47K resistor. The ONOFF pin is connected with a button circuit always powered on (3V) that is used to enable power supplies too. This allow us to use SW shutdown or HW shutdown.Thanks
My apologies for the delay. The recommendation is not to apply any voltages to the i.MX6 pins while there are no voltage sources of the processor, as there could be current leakage and ultimately damage to the processor. You may have only the VDD_SNVS_IN voltage, which is associated with the ONOFF pin, so you can keep the desired configuration.
You do not give details on how you are generating the supplies for the i.MX (either trough individual regulator or a PMIC) but you may be able to work with your configuration with VDD_SNVS_IN constantly present.
I hope this helps!
Thank you, your support is very useful. Best regards
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