How to read cell voltage with LTC development kits via S32K312EVB-Q172 (MBDT)

[Berke_E]

Hello,

I’m working on a project using an NXP S32K312EVB-Q172 board to measure cell voltages with a LTC6811 battery monitoring IC. My setup is as follows:

1. LTC6811 measures 12 “cells” (actually 12 series resistors for testing).
2. The LTC6811 outputs data over isoSPI to a LTC6820.
3. The LTC6820 then translates isoSPI to standard SPI, which is connected to the S32K312 board.
4. On the S32K312, I want to run a Simulink model using NXP’s Model-Based Design Toolbox to read the SPI data from the LTC6811 (through LTC6820) and eventually process/display it.

I made the connection between the LTC cards and used the pins I found from the pin map of S32K312 in the first image for the wiring between LTC6820 and S32K312. However, I am a little confused about the simulink side. First of all, I would like to ask if this process is possible. Secondly, I would appreciate it if you could give me some help or ideas on how to do it.

Thank you in advance for any guidance you can provide.

[SorinIBancila]

Hello,

I can't see any problem why your application shouldn't work. As a starting point, I recommend you to check the following webinar: Introducing the SPI Communication Blocks from NXP MBDT . It describes in great detail the SPI communication and how to implement it in Simulink for a S32K1xx board. 

On this community, you have valuable resources available to get an insight into MBDT workflow.:

• NXP Model-Based Design Tools Knowledge Base
• Beginner's Guide for Model-Based Design Toolbox
• Webinar

All of the above can be found on the right of the main page.

Please let me know if these are helpful and don't hesitate to contact in case you experience further problems.

Best regards,

Sorin Ioanid Bancila