TCA9548A: TCA9548 Reset and I2C Detection

Sandiri Manoj Kumar

Prodigy 40 points

Part Number: TCA9548A

Hii

I have Design TCA9548 PCB Board. I have forget RESET pin connect to VCC in this case device I2C is Not Detecting.

Any other way to get I2C Detection or Reset.

Thank you

over 3 years ago

+1 Clemens Ladisch over 3 years ago

Guru 298130 points

While the /RESET pin is low, the device will not work at all. You must add a connection to V_CC on all boards.

+1 Rosemary Sanchez over 3 years ago

TI__Prodigy 380 points

Hi Sandiri,

Can you elaborate if the reset pin in your design is completely floating or is it connected to a GPIO?

Regards,

Rosemary

+1 Sandiri Manoj Kumar over 3 years ago in reply to Rosemary Sanchez

Prodigy 40 points

Hi Rosemary

I have Design PCB Board for TCA9548 but i forget to give RESET pin to VCC and Reset Pin is not Floating through VCC or GPIO also.

+1 Sandiri Manoj Kumar over 3 years ago in reply to Sandiri Manoj Kumar

Prodigy 40 points

Any other way to RESET because without Reset pin high I2C is not detecting.

I have seen datasheet we can go with power on reset (POR)

+1 Clemens Ladisch over 3 years ago in reply to Sandiri Manoj Kumar

Guru 298130 points

POR and /RESET are two independent mechanisms. When /RESET is low, the device is resetting regardless of supply voltage.

+1 Rosemary Sanchez over 3 years ago in reply to Sandiri Manoj Kumar

TI__Prodigy 380 points

Hi Sandiri,

What Clemens is explaining is correct. A recommendation is to tie reset HIGH, otherwise it could just randomly reset during operation due to noise. Please let me know if this help and answers your question.

Regards,

Rosemary

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TCA9548A: TCA9548 Reset and I2C Detection