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tca6416a strange behavior

Other Parts Discussed in Thread: TCA6416A

hi,

i m working with a TCA6416a for driving 8 leds and 4 keys. i m using the the device with VCCI=VCCP=3.3V

i have 4 LEDs that allways on.  everything is fine but sometimes the device switch into the default configuration so the LEDs will be off because the different ports switch to an Input mode.

it's like the device is passed with a reset mode but i don't find why this happen ?!

why the device switch to it's default configuration ?

thanks