topic Connecting current shunt to FRDM33772BSPIEVBUG in Model-Based Design Toolbox (MBDT)

Connecting current shunt to FRDM33772BSPIEVBUG

rparveez — Thu, 17 Sep 2020 13:03:38 GMT

I tried connecting current shunt(750A-50mV) to M33772B board at pin 31(P) and pin 32(N) but was unable t read current values. I am using MBDT and have configured shunt value in Config block.

Could you please help with the connection or let me know if I have done something wrong?

Re: Connecting current shunt to FRDM33772BSPIEVBUG

mariuslucianand — Fri, 18 Sep 2020 08:52:08 GMT

Hello @rparveez ,

According to the schematics, you have to connect the load between 31(P) and 31(N) and you have to connect the load between pin 32 and pin 2 to have the current that flows through the circuit over that resistor. Do you measure the right value using the multimeter?

If so, I would try getting the raw register that the MC33772B using the read register block, exactly the register that stores that measured value of the shut register. You can find an example here:

https://community.nxp.com/t5/NXP-Model-Based-Design-Tools/How-to-use-your-own-C-code-in-our-Toolbox-Battery-Management/tac-p/1135144/highlight/true#M166

Hope this helps,

Marius

Re: Connecting current shunt to FRDM33772BSPIEVBUG

rparveez — Wed, 07 Oct 2020 20:33:30 GMT

Hi @mariuslucianand,

Thank you for your reply.

Did you mean shunt between 31(P) and 32(N)? And between Battery +ve (X1-2) and Battery -ve(X1-32(N)) ?

I was still to read the current value.

Re: Connecting current shunt to FRDM33772BSPIEVBUG

Harmon_9 — Thu, 08 Oct 2020 06:56:18 GMT

I faced similar kind of issue last time, I am still searching for some proper solution

please send some solution regarding to it , keep sharing myaccountaccess

Re: Connecting current shunt to FRDM33772BSPIEVBUG

mariuslucianand — Thu, 08 Oct 2020 11:52:52 GMT

Hello @rparveez ,

Yes, according to the schematic Philippe added to this https://community.nxp.com/t5/NXP-Model-Based-Design-Tools/How-to-use-your-own-C-code-in-our-Toolbox-Battery-Management/tac-p/1119023#M70 your assumption is correct.

Hope this helps,

Marius