TXB0106 Translator problem

Jaison Joy

Other Parts Discussed in Thread: TXB0106

Hello,

I am interfacing an SPI communication between 5V(microcontroller) and 3.3V(audio IC) system.

Since I experienced loading effect at the 3.3V (VCCA) side, I added 4050 buffer and solved the problem as shown in the schematic.

But 3.3V data from A port is not getting translated to 5V at B port. It is showing ~2V at Pin11, ( related to Pin6, MISO_IN)

I am prototyping this TXB0106, so the data cable length are more than 10cms on both 5V and 3.3V systems. Will that cause any problem?

Please guide me to solve this problem.

over 12 years ago

0 hu liu over 11 years ago

Prodigy 25 points

It seems that i got the same problem. I need to change encoder feedback waves (5V)to3.3V. The input voltage is 5V, however, one pin of output (pin 1) the output voltage is not 3.3v.(1.8V~2.2V)

Very appreciation your answer!

0 Jaison Joy over 11 years ago in reply to hu liu

Prodigy 185 points

Hi Hu liu,

Do you have the wires/PCB traces lengthy? If so, try reduce the length, it can solve the problem. In my case it was this capacitance issue.

Regards

Jaison

0 Wei Lang over 11 years ago in reply to Jaison Joy

TI__Expert 6430 points

Hi Jaison,

Any pull-up resistor on MISO or MISO_IN?

Thanks

0 hu liu over 11 years ago in reply to Jaison Joy

Prodigy 25 points

Hi Jaison Joy,

The three phases wires/PCB traces lengthy are the same on the product. the only one phase output 1.8V~2.2V.The other two phases output 5V.the output waves are square wave.the circle is attached 。

0 Jaison Joy over 11 years ago in reply to Wei Lang

Prodigy 185 points

Hi Wei Lang,

First of all sorry for delayed reply, since was not visiting this forum for a long time.

In my case there were no resistors (as pull-up) on MISO or MISO_IN.

Regards.

Logic

Logic forum

TXB0106 Translator problem