What state of disable channels of PCA9548A?

[ghxy00]

1) With a channel selected/enabled, the behaviour of SCLOUT/SDAOUT will be identical with SCLIN/SDAIN. Is it right?

What status of the deselected/disnabled others? Are they will output High-impedance or in 3-state?

2) Can the SCLOUT/SDAOUT pins of two PCA948A devices directly connect to one slave device such as a temp sensor? Only one set of I2C pairs be activated at one time.

[ghxy00]

Hello,

Here is the application scenario that two master to access a slave device.

Can it works?

[TomasVaverka · Accepted solution]

Hello Junjie,

Yes, this will work if only one set of I2C pairs will activated at one time.

Best regards,

Tomas

[TomasVaverka]

Hello,

1. Yes, the master SCL/SDA signal pair is directed to the selected channel(s) of slave devices.

When a channel is selected, the channel becomes active after writing to the control register with a stop condition placed on the I2C bus.

Not selected (disabled) channels are in a high state (idle).

2. I do not quite understand this use case. Can you please elaborate on this?

Best regards,

Tomas