Is it possible to use L9963E daisy chain without L9963T?

[berg0vic]

 

I'm using a single L9963E and it works fine. However, I couldn't start daisy chain connection. When I consider BMS architectures in datasheet, all of them has L9963T transceiver to communicate with further IC. My custom PCB doesn't provide L9963T.

So I have two question:

1- Do I really need a transceiver for USE MULTİPLE l9963E slaves ?

2- Can I use the transceiver on EVAL-L9963E-MCU for this purpoeses?

Bear in mind, I'm using an external MCU, not built in SPC MCU chip.

Lastly, as I said, I can succesfully communicate single IC and I'm using a cable that has low capacitance.

 

[Peter BENSCH]

Welcome @berg0vic, to the community!

1. When working with several L9963E in a BMS, this is typically necessary for a series connection of more than 14 battery cells. In this case, the communication of the control MCU, which is usually at GND potential, must of course be galvanically isolated, for which the L9963T is specially designed.
2. The EVAL-L9963E-MCU also uses the L9963T, so that it can of course be used for this purpose.

Does it answer your questions?

Regards
/Peter

[berg0vic]

Hi, 

 

Thanks for your response Peter. Now my current implementation has 4 wire SPI connection between MCU and L9963E. To use multiple IC I need to use transceiver between L9963E and MCU. Did I get right ? In this way, it will translate my signals to 2 wire isolated spi. 

But according to datasheet the first node of chain can be one of these:
"The daisy chain and dual access ring topologies are based on a chain of BMS evaluation boards. The chain first node can be an AEK-POW-BMSWTX, an AEK-POW-BMSNOTX or an AEK-POW-BMSWTX. The remaining nodes must be all AEK-POW-BMS63EN evaluation boards."

As far as I understandalso "AEK-POW-BMSNOTX" does not contain L9963T and it can be use for the first chain of daisy chain. Thus my 4 wire SPI implementation can also be first chain of the daisy chain line. The datasheet is not very clear.

Best regards,