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Original question:

TCA9548A-Q1: Designing with TCA9548A

TCA9548A: Desiging with TCA9548ADGSR

Sv
Intellectual 695 points

Part Number: TCA9548A

Hello Team,
We are using the device TCA9548ADGSR in one of our products.
Can you please review the schematic of the same?.

image.png

1). The MCU side (SCL & SDA) of the device is at 3.3V while the slave side of the device is working at 5V (SCx & SDx).
2). Is there any problem if we connect another MCU at the downstream side?.

Looking for your reply

 

 

  • 0
    Guru 324730 points

    With VCC at 3.3 V, this will work.

    I²C is a bidirectional protocol; it does not matter where you place master and slaves. But when you want to enable/disable channels on the TCA0548A, this is possible only from a currently active channel, i.e., it should be done from the upstream side (SCL/SDA).