Tool/software:
Dear Sirs and Madams,
We would like to use the PCA9306 as an I2C switch.
Therefore, we are considering the following configuration.
Since the I2C bus lines arepulled up to different 3.3V, is it okay to connect VREF1 and VREF2 to 3.3VB?
This is because we want to minimize the number of connection lines between boards.
If the TCA9617 and TCA9803 can be used in a similar way, which device would be best?
Regards,
Masashi
Hi Masashi,
Since the I2C bus lines arepulled up to different 3.3V, is it okay to connect VREF1 and VREF2 to 3.3VB?
This is because we want to minimize the number of connection lines between boards.
This is a valid connection scheme.
To ensure that PCA9306 is high-z, EN must = 0 V. When you want to pass I2C signals through the switch, EN = 3.3 V.
Since you are not using the reference voltage pins VREF1 and VREF2, consider using the LSF0002 for this type of application.
It should simplify your board design, less pins, and should be cheaper.
Regards,
Tyler
