U2C_RESULT U2C_DropSda(
      HANDLE hDevice
);
The U2C_DropSda() function pulls down the I2C bus SDA line.
Parameters:
- hDevice
- Handle to the U2C-12 device. 
Return values:
U2C_SUCCESS
The SDA line was successfully dropped.
U2C_HARDWARE_NOT_FOUND
U2C-12 device referenced by hDevice handle was not found.