Thanks for finding the problem there outlandnish. It's a pretty facepalmingly stupid bug on my part. No idea how I managed to get that in there. Your fix is on the right track but is actually the reverse of what's required. The way the gate drivers work is that the first data to be clocked out ...

@Dave, here's a PR that addresses the error ordering. I don't have the board in front of me to test unfortunately, but let me know how it gels with your understanding of the hardware: https://github.com/davefiddes/stm32-sine/pull/1

That was it! It looks like at some point during installation the D8 diode lifted off of the board. Fixed that and no more gate driver issues.

It looks like the error messages for Phase C Hi and Phase B Hi are flipped

Did you check the board was working before soldering it to the inverter chassis & mosfets? I would recommend bench testing with just 12V and CAN. The inverter should come up and report that the gate drivers are all OK. It doesn't need the big mosfets to function. You shouldn't need to dismount to ...

That's a brilliant diagram. I have added it to the Github repo. The Reg errors are likely caused by a short dropping the Phase C hi isolated power rail. it wont cause any harm as each supply has its own current limiter.


Thanks! I've updated the diagram in that post to account for a couple more ...

Here's the OEM to OpenInverter pin mapping if anyone needs it:

Screenshot 2025-11-18 at 8.14.53 AM.png

Pin 1 is the lower right from the outside of the inverter and the lower left of the housing facing towards the PCB.
Pins are ascending in each column - the bottoms pins are Pin 1 / Pin 11 / Pin ...

I started a new thread here for my controller: https://openinverter.org/forum/viewtopi ... 757#p87757

After a pausing for most of the year, I finally revisited a project I started back in February. I made an ECU that can communicate with Taycan BMS modules.

In my conversion, this board also manages the HV system in my car. Here's the current iteration:
IMG_20251117_164121551_HDR.jpg

It has two ...

IMG_20251114_122440603_HDR.jpg
IMG_20251114_122427939_HDR.jpg

Just waiting on some temperature sensors, but it has passed all the power up tests so far!

When I pulled out the 30 pin header, I used spare aluminum bus bars to block of the rest of the PCB from damage from the blow torch. A bit ...

My inverter PCB arrived today! Waiting for a new 980 inverter that I'm using as the donor board. Hoping to have it mostly assembled tomorrow.

If I have time, I'll try to get the thermistor and current sense blocks 3D prints designed.

I finally had a chance to revisit this project and I got communications going with the Taycan packs with both an STM32 and an ESP32! Going to start building out an OpenInverter compatible BMS solution around it.

Quick update for anyone curious: the Taycan appears to use the MC33772B, not the MC33772C. This uses the old TPL technology from NXP, not the TPL2 or TPL3 that the MC33665 chip supports. Back to the drawing board with an MC33664 transceiver instead of the MC33665.

I've been using trying to get communication to Taycan modules using two different NXP based eval boards. The latest is the KIT-PC2TPLEVB with the NXP ScriptGUI software. I've tried both TPL ports on 5 different batteries and cannot get any communication using the example_TPL2_772C script.

I'd be ...

As another aside, I saw the schematic image shows a TIC10024. That IC is for digital switches only and doesn't have ADC support. Did you mean to use a TIC12400 instead? That one does have an ADC for analog inputs.

Good catch on the second SPI interface being exposed via I2S. It's so bizarre they didn't use their own secondary SPI interface port on the Micromod connector.

I'll give that code a shot, thanks!

Thanks for your inputs on this and other forums, I released HeadlessZombie to production today.

Fingers crossed!

Now, firmware...

image.png


This is so cool - congrats! You built out something I wanted to do myself - down to the Micromod platform. One challenge I found was the odd omissions ...

I have designed a PCB to interface with the NXP MC33771 BMS IC's using TPL. Though the full Datasheet is NDA'd there is a light version that has "most" of the functions to monitor and balance.

But I suck at programming. NXP do provide a SDK and evaluation kit with software. Using my PCB I was ...