PCA9306: About use with AM57xx

Hi Ladisch,

Thank you for your reply.

In other words, can PCA9306 be used as a buffer for 3.4Mbps I2C?
You said "the other devices connected to the bus must be able to handle them." What kind of devices need to comply with the check list's falling edge rules?

Hi TI Team

I would also like to hear from the TI Team about the questions I posted.
I would be grateful if anyone from the TI Team could answer.

Regards,
Y.Ottey

Yes, the PCA9306 will work with 3.4 MHz I²C.

All other I²C devices must be able to handle the I²C signals generated by the AM57xx.

Hi Y.Ottey,

I need to point out that PCA9306 is not an I2C buffer, only a level translator. 

Technically the PCA9306 can support the 3.4MHz range but you may see some 'artifacting' from the device where it may hang around the Vg-Vth voltage during the rise and fall times and may last double digit nanoseconds. 

I'm not as familiar with the I2C standard outside of 1MHz but I believe the I2C bus turns into push pull when your in those higher speed ranges and ACKs are no longer supported at that speed. Common I2C speeds usually are 100kHz and 400kHz, when higher speeds are needed people usually flock to a different protocol like SPI. 

-Bobby

Hi BOBBY

Thank you for your reply.

I understand that the PCA9306 is just a level shifter and that there are problems with the PCA9306.

For LSF0102, can it be used as a buffer for 3.4Mbps I2C?
(Does the above AM57xx 3.4Mbps I2C line fall edge requirement meet?)

This device is a level shifter similar to PCA9306, but I confirmed that it is an IC that supports signals up to 100MHz.

Best Regards,
Y.Ottey

PCA9306 and LSF0102 are essentially the same device. Both support the same frequencies.

Hi Ladish

Thank you for your reply.

Hi BOBBY

I would appreciate your feedback on my additional questions.

Regards,
Y.Ottey

Y.Ottey,

Clemen's response is correct. Both will technically support 3.4Mbps/MHz  under the right conditions. 

-Bobby