Note: Orders received March 27 through April 7 may experience shipping delays. Normal operations should resume on April 10.

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
Note 1: Alternate color reflects use with more modern twisted pair cables. These are not recommended, as I2C is not differential and thus twisted pair only adds additional capacitive effects.