OECVCI
Open Electric Vehicle Control/Conversion Interface. 
v 1.0 10/31/18 Untested
• Connector is small which causes wiring challenges. 22AWG TXL wire barely fits in the housing, and only when crimped enough. Since recommended crimper is very expensive I used one that we had here for Microfit 3.0 series. It still cost $363 but works well with the plastic guide removed using the smallest crimp option. MPN 0638190000
• Faults: R22 and R24 Grounds not connected, needs jumper. Fixed in 1.01
• Change upper input resistor dividers to 30k, (r31,32,34,35,36,37) gives required 2.31V High level above 9.2V input. Fixed in 1.01 


This board is used to interface CAN bus signals in cars. 
Commonly used when using modern EV (Electric Vehicle) parts in older vehicles. 
Built around the Teensy 3.6 Microcontroller module, it provides: 
2 CAN 2.0 ports. Solder jumpers activate termination. 
6 Inputs: 12V nominal Analog or digital, protected from over and negative voltages. 
6 Outputs: General purpose Open Drain might hold 2 amps. Ground trace limited.
2 Outputs: Pulse outputs, low current Open Drain with pullup resistor for driving electronic tachometer and speedometer. 
1 Fuel Gauge Output. 6 bits of Open Drain switched parallel 1206 Resistors to drive original Gas gauge. 
1 ISO-SPI for Linear Technology 6804/6811/6813 series BMS modules. 
1 Coin Cell holder in case you want to use the RTC. 
1 I2C header for running a small display or whatever. 
1 Daughter board area 30x70 std perf board, (interferes with I2C)

Made to fit in a standard Polycase LP-51 enclosure with access cut for connector. 

Possible future upgrades: 
2 Automotive relays for general switching of the 4 high current (16A) terminals. 
Daughter board with op amps and resistor arrays for sensing pack voltages, enabling contactor precharge and ground fault isolation testing of 400V systems.

Made with KiCad 5.0.1 on OSX
When first opening the schematic file, you may have to "recover footprints." 
I saved and included the google spreadsheet as pdf since it dropped sheets for ods. 

I'm new to KiCad, so please feel free to contact me with suggestions. 
Also, I haven't bothered to consider the licenses, 
for now consider it free for non commercial use 
Contact me to permission for any use involving exchange of money. 

-Otmar
Be sure to select "Otmar" so I will get your message: 
http://cafeelectric.com/contact.php