Other Parts Discussed in Thread: SN74LVC2G66
Can VREF1 = VREF2 = 3.3V? Just to use the PCA9306 to isolate one I2C bus from another.
Related: Can VREF2 = 0V when VREF1 = 3.3V?
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Can VREF1 = VREF2 = 3.3V? Just to use the PCA9306 to isolate one I2C bus from another.
Related: Can VREF2 = 0V when VREF1 = 3.3V?
This device is a passive switch. It isolates the buses only when EN is pulled to GND.
If you want to disconnect two buses from each other, use a simple switch like the SN74LVC2G66.
Yes, but you could replace it with two wires.
When VREF1 = 0 V, a current will leak from VREF2 to VREF1. But when VREF2 = 0 V, EN also is 0 V, and the I/Os are disconnected.
We need to turn VREF2 and EN off during sleep, otherwise we wouldn't need to isolate the I2C buses.
Inderjit,
Clemens is correct. If your supplies are equal to each other you can use the device in a switch configuration:
Best,
Chris