6P6C I2C Connector Standard
In order to allow many of our I2C peripherals to easily communicate with each other, we standardized on a standard 6 position, 6 conductor (6P6C) modular connector, colloquially referred to (incorrectly) as an RJ11, RJ14, or RJ25.
Pinout
| Pin | Color | Alt Color1 | Signal |
| 1 | White | White/Green | /OEN - Outputs enabled when low |
| 2 | Black | White/Orange | I2C SDA |
| 3 | Red | Blue/White | Ground |
| 4 | Green | White/Blue | /RESET - Resets external peripherals when low. Alternatively, on some boards, can be used for +5V supply (<1mA) |
| 5 | Yellow | Orange/White | I2C SCL |
| 6 | Blue | Green/White | /IRQ - Input to the CPU, when pulled low indicates some peripheral is signaling an interrupt to be handled |