TCA9539-Q1: will INT effective when power on

Elec Cheng

Part Number: TCA9539-Q1

Hi Expert,

Assuming TCA9539-Q1 is just powered on and the I2C is not established yet, all I/O is default as input. If there is rising or falling edge on the port, will TCA9539-Q1 generate low signal on INT pin? Thanks

BR,

Elec Cheng

over 2 years ago

0 Clemens Ladisch over 2 years ago

Guru 283290 points

The interrupt detection logic is always active.

Please note that an interrupt might be generated due to the voltage changes that happen during power on.

0 Tyler Townsend over 2 years ago

TI__Mastermind 32773 points

Elec,

An interrupt is generated by any rising/falling edge of the port inputs when in input mode. Since device defaults on p-ports to inputs on start-up, any change rising/falling edge on the port will trigger the INT pin.

Regards,

Tyler

Because of the holidays, TI E2E™ design support forum responses will be delayed from Dec. 25 through Jan. 2. Thank you for your patience.

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TCA9539-Q1: will INT effective when power on