OOPic's 5-pin I2C Network Connectors
The I2C Network connectors provide the following connections.
  • I2C Network.
  • +5 Volt Power & Ground.
  • Can be optionally used for a non-network connection to I/O lines 19 and 20.
4 pin male(At the OOPic)
4 pin female(At the cable)

The connector is a 5-pin, .100 inch spacing, polarized, locking connector manufactured by AMP,  Part# 640456-5.  
A suitable polarized, locking header is manufactured by Waldom, Part#22-01-3057
Digikey carries both of these parts.
Note that the connector is optional on the OOPic-C.

OOPic-C

OOPic-S

OOPic-R

The following table show the pin assignments for the 5-pin network connectors.
PinNameDirDescriptionFunction
1SDAI2C Serial Data
I/O Line 20		The I2C Serial Data signal provided by the current I2C Master or Slave.
2GND---Ground0 Volt reference
3SCLI2C Serial Clock
I/O Line 19		The I2C Serial Clock signal provided by the current I2C Master.
4+5+5 Volt power.+5 Volt reference
5RESETReset (Active Low)Pulled low to reset the OOPic.