I plan on making my own BMS for a 12S battery pack, and I found TI's TIDA BMS board and decided to use it as a reference to gain some understanding on how to develop safety circuit for the board. While studying the schematic of the board, at a point they are using different reference for something I don't properly.

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As you can see, the D46 and D45 Schottky Diodes are connected to PACK- pin, while the Zener(s) are connected to GND. Also, what is the purpose of shorting PACK- with PACK+ pins? Shouldn't the PACK- pin connected to the GND?

I went through this answer, but I don't think the purpose of different reference is the same in this case. Thank you in advance.


1 Answer 1


The pack- is not shorted to pack+.

And the ground reference GND for the circuit is the battery cell negative terminal.

And pack- is connected to GND, quite well actually, via 1 milliohm shunt resistor for current measurement.

  • \$\begingroup\$ So then what is the need of D45 and D46? Why they have written PACK- while the Zener(s) have GND? \$\endgroup\$
    – Momobear
    Commented Aug 8, 2023 at 4:57

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