6
I
2
C Bus Mini Interface Receptacle
Mini Interface Receptacle Pinout
I
2
C Bus Mini-Clip-Lead cables are available to connect the iPort/AI 2 adapter to a
target system. Each clip-lead is identified (White=C=SCL, Red=V=+V,
Green=D=SDA, Black=G=Ground.
I
2
C Bus Mini-Interface cables with two Mini Interface plugs are also available to
connect the I
2
C adapter to an external I
2
C Bus.
3 Hardware Configuration
Circuit Sense
™
The iPort/AI 2 includes MCC’s
Circuit Sense
technology. Circuit Sense allows the
I
2
C intV wire can operate in two modes, Power Source Mode and Voltage
Sense Mode. Mode selection is controlled by the MODE slide switch on the side of
the unit enclosure.
Power Source Mode
- The +V wire can supply power (5v @ 100 mA) Vcc to an
external I
2
C Bus system. In Power Source Mode, the voltage of the iPort/AI 2 SCL,
and SDA internal pull-ups, if enabled, and Voltage Sense circuit (0.3Vcc Low
MAX
,
0.7Vcc High
MIN
) is connected to the adapter’s +5v power supply. (Use of the +V
wire in Power Source Mode is user optional).
Power Source Mode is similar to the standard mode of operation on earlier versions
of MCC I
2
C Bus host adapters.
Voltage Sense Mode
- The +V wire is connected to the external I
2
C Bus system
pull-up supply voltage (0.5v to 5v) Vcc, and automatically adjusts iPort/AI 2 SCL,
SDA, and /INT Voltage Sense circuit levels to match (0.3Vcc Low
MAX
, 0.7Vcc
