TCA9406 leakage question

Kai Hsiao

Guru 12675 points

Other Parts Discussed in Thread: TCA9406

Dear Sir

If I connect TCA9406 VCCA to OE# directly and turn on VCCA=1.8V and turn off VCCB ,

Due to this moment OE# is still enable

Does TCA9406 will have leakage voltage on VCCB or SCL_B / SDA_B ??

In this condition ,about OE# , we need to connect pull low resister to GND and pull up resister to VCCB ,Is it correct ??

Thanks

over 9 years ago

0 Jonathan Valdez over 9 years ago

TI__Genius 16510 points

Hello Kai,

THanks for the question. We are looking into this and will have a question for you shortly.

0 Rajan Arora over 9 years ago in reply to Jonathan Valdez

TI__Intellectual 2175 points

Hi Kai,

I checked the scope shot of the TCA9406 with VCCA = 1.8V, VCCB=0V, OE tied to VCCA, and I2C signal on the SCLA/SDAA.

I do not see any leakage voltage on the SCLB/SDAB lines due to the signal on SCLA/SDAA when VCCB is 0V. Also, looking at the circuit when VCCB = 0V, the A and B sides are completely isolated.

Thanks,

Rajan

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TCA9406 leakage question