Serial with voltage translator

[mrezan]

Hi

I've problem on my design when I use voltage translator to communicate with sensors.
Can you guys see pictures below:

1.nRF52840 using 3.3v:

1.nRF52840 using 1.8v:

Issues with spi and i2c. I use the slowest speed, 1MHz for spi and 100kHz for i2c still can't get it works.
For uart it is works fine.

For i2c I've put pull up resistor on both side. Still not works.

Any one have counter this issue?

Thanks Best Regards,

Rezan

[mrezan]

Dear All,

Thanks for the feedback and checking it.

For the failure to communicate using I2C, It is my bad.

Yes, it is not suitable for I2C. It mentioned in the datasheet but I overlooked it:

LSF0204 is the right component.

For the failure to communicate using SPI to sensor  1.

I can confirm it is not nrf problem. I did try to communicate between two nrf52840. It can exchange the data.

Failed to exchange data with sensor.

On the circuit part, no pull up resistor at both sides.

What else can I do except check from an oscilloscope? Currently I am short of tools in my hand.

I know the issue is not related anymore to nrf, but if you guys can give suggestions I'm very thankful.

Thanks