Socket Type I

I2C interface. Pins 8 and 9 are the dedicated I2C data (SDA) and clock (SCL) lines. Note that a mainboard should include pull-up resistors for these pins, in the region of 2.2K Ohms. Modules must not include their own pull-ups on these lines. In addition, pins 3 and 6 are general-purpose input/outputs, with pin 3 supporting interrupt capabilities.


Pin 1 Pin 2 Pin 3 Pin 4 Pin 5 Pin 6 Pin 7 Pin 8 Pin 9 Pin 10



A general-purpose digital input/output pin, operating at 3.3 Volts.

! Interrupt-capable and software pull-up capable GPIO (the pull-up is switchable and in the range of 10,000 to 100,000 ohms).


Modules must not connect to this pin if using this socket type. Mainboards can support multiple socket types on one socket, as long as individual pin functionalities overlap in a compatible manner, so that a pin from one socket type can overlap with a [UN] pin of another.

+3.3V Connection to the +3.3V power net.
+5V Connection to the +5V power net.
GND Connection the power ground net.

Connector Pin Numbering

Pins numbers for the male 10-pin connector standard Gadgeteer socket, as seen from above. In most cases, the ribbon cables will have the pin 1 conductor marked in red.


Last edited Nov 10, 2011 at 3:38 PM by nvillar, version 2


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