| Description | Rear Power Distribution |
|---|---|
| Target release | MSXIV |
| Epic | |
| Document owner | |
| Project leads | Arshan Khanifar |
| Team members | Arshan Khanifar Gerry Shebib |
Goals
<put summary of project here>
Background and strategic fit
CAN Communication
Requirements
Meeting Notes
Things that it powers:
- BMS
- rear lights
- strobe light
- motor controller interface
- solar sense
When on aux:
- BMS
- Rear lights
How it works:
- GPIO
- I2C
Questions
| Question | Answer |
|---|---|
| How do you control the rear lights? | The lights are controlled by the GPIO pins of the MCP23008 I/O expanders. These I/O expanders are accessible over the I2C bus. The two which control the rear lights are address 0x20 and 0x22. The expander at 0x20 is used to set the diagnostic selection pins for the strobe light (GP1), rear brake lights (GP2), and rear turning lights (GP3) - active high. The expander at 0x22 is used to enable each of the rear lights (GP2-7) - active high. I/O Datasheet: http://ww1.microchip.com/downloads/en/DeviceDoc/MCP23008-MCP23S08-Data-Sheet-20001919F.pdf Power Switch Datasheet: https://www.infineon.com/dgdl/Infineon-BTS7200-2EPA-DS-v01_00-EN.pdf?fileId=5546d462636cc8fb016421e548a61215 |
| How to control the power of each board? | |
| What are the incoming CAN messages? | |
| What are the outgoing CAN messages? | |
| How do you manage power when the car turns on? | |
| How do you manage power when the car turns off? | |
| What is still powered when there's been a BMS fault? |