TCA9535: Port State Before POR

Hideki Hayashi1

Genius 9290 points

Part Number: TCA9535

Hi team,

When there haven't POR yet, how is the output state at each pin (/INT, SCL/SDA, Px)?

Best regards,

Hideki

over 4 years ago

0 Tyler Townsend over 4 years ago

TI__Guru 55988 points

Hi Hideki,

The first time this device is powered on for its application, the following pins will go to their default state:

SCL/SDA = High-Z inputs

Px = High Z- inputs

/INT = Active low Output connected to VCC through pullup resistor (typically 10kohm)

Regards,

Tyler

0 Tyler Townsend over 4 years ago

TI__Guru 55988 points

Hi Hideki,

I realize that this may not be the answer you are looking for. Give me till 5pm tomorrow to get back to you with a more correct response. You are interested in the output state of each pin before device is powered on for the first time, not after a POR, which I gave below.

Regards,

Tyler

+1 Tyler Townsend over 4 years ago

TI__Guru 55988 points

Hi Hideki,

The state of each pin is High-Z before power on.

Please let me know if you have anymore questions.

Regards,

Tyler

0 Hideki Hayashi1 over 4 years ago in reply to Tyler Townsend

TI__Genius 9290 points

Hi Tyler,

Yes, the latter is what customer needs to know. Appreciated for your support, and thankful for your self correction.

Best regards,

Hideki

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TCA9535: Port State Before POR