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ISO1541 cascade

Dotan Shambi
Prodigy 10 points
Other Parts Discussed in Thread: ISO1541, ISO1540

Hello ,

I would like to use 4 ISO1541 in my power supply card design in the following structure :

I2c from external MCU         >                 first stage internal I2C            >         current sensing of power supply via I2C

------------------------------------ISO1541------------------------>-----------------ISO1541-------->----------i2c Current sensor

                                                                                       |

                                                                                        ------>----------ISO1541 ------>-----------I2C current sensor 2

                                                                                       |

                                                                                       -------->----------ISO1541----->------------I2C current sensor 3

I hope I managed to explain my intentions , my question is : can I cascading the ISO1541 to each other (as I draw above) ? I would like to cascade three in parallel and after it one in serial - can I do it ?

Best regards

Dotan

  • 0
    TI__Mastermind 21326 points

    Hi Dotan,

    The manner in which you are looking to use the isolated I2C devices is correct. It should work as you describing just fine.

    Are you looking to have a single master system that supplies the clock at all times? I notices you have the ISO1541 in your diagram above. If your system will be multi-master, then you will need to use the ISO1540.

    Please let me know if you have any other questions,

    John

  • 0 in reply to John Griffith
    Prodigy 10 points
    Hi John

    I am using Dotan's configuration above as well but one master connected to external MCU ISO1540 devices. Questions:
    1) Should this be done as MCU SIDE 1 ISO1540 SIDE 2 -----to------- SIDE 2 ISO1540 SIDE 1 --------------- -i2c Current sensor
    to------- SIDE 2 ISO1540 SIDE 1 --------------- -i2c Current sensor 2
    to------- SIDE 2 ISO1540 SIDE 1 --------------- -i2c Current sensor 3
    That is when interfacing ISO1540/1 in cascade you must connect SIDE 2 to SIDE 2
    2) Can ISO1540 be cascaded SIDE 1/SIDE 2 SIDE 1/SIDE 2?

    I used ISO1540 to allow for common BOM parts I could have used ISO1541
    Regards

    Mark