TCA9548A: Hot insertion funciton of TCA9548

Lisa Xu

Intellectual 495 points

Part Number: TCA9548A

Tool/software:

Dear TI Team:

I get information from datasheet of TCA9548 that it can support Hot insertion.

1.Could you pls explain more detail how the TCA9548 support Hot insertion?

2. In the event the slave is communicating while removed,the I2C may be also locked-up,Right?

Thanks

Best Regards

Lisa

1 month ago

0 Clemens Ladisch 1 month ago

Guru 265780 points

As long as the channel on with devices are being (un)plugged is not active, the bus is not disturbed.

+1 Justin Lewis 1 month ago

TI__Prodigy 300 points

Hi Lisa,

1. As Clemens said, the bus will not be disturbed as long as the channels are not active on the device that is be added/removed.

2. It is not recommended to remove the slave while it's channels are active.

Regards,

Justin

0 Lisa Xu 1 month ago in reply to Justin Lewis

Intellectual 495 points

Hi Justin:

For Question 1:

As we know, when device hot plug in/removed, it will cause voltage/current fluctuation,

what is the voltage/current can be sustained by the mux when device hot plug?

Or the mux just use its physical isolation between channels to achieve no impact on i2c bus when hot inserstion/remove,RIght?

Best Regards

Lisa

+1 Clemens Ladisch 1 month ago in reply to Lisa Xu

Guru 265780 points

The mux itself does not really care. But an active channel is directly connected to the rest of the bus, so hotplugging will also affect all other devices.

0 Lisa Xu 1 month ago in reply to Clemens Ladisch

Intellectual 495 points

Got your point,Thanks Clemens and Justin.

Best

Lisa

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TCA9548A: Hot insertion funciton of TCA9548