5
Hardware Configuration
Pull-up Resistors
The
iPort Host Adapter includes a slide switch used to enable or
disable internal I
2
C Bus 1.8K ohm Pull-Up resistors. Every I
2
C Bus
system must have at least one Pull-Up on the SCL and SDA lines.
Use this switch to configure the iPort appropriately for your
system.
Connecting to a 3.3v System
1. Shut off iPort internal pull-ups. (See Pull-up Resistor section)
2. Use external pull-ups to 3.3 volts.
The iPort is a 5-volt device. 3.3v is high enough for the iPort to see
a Logical 1.
Connecting to an SMBus System
1. Shut off iPort internal pull-ups. (See Pull-up Resistor section)
2. Use external SMBus rated (approx. 15k ohm) pull-up resistors.
Hardware Set-Up
1. Attach your iPort(#MIIC-201) to an open ComPort on your
computer. If your ComPort has a DB9 connector, use DB-9F to
DB-25M Serial Port Adapter Cable included with your iPort to
connect.
2. Connect the power supply provided or see Interconnect Section
+5VDC Power Jack.
3. Connect I
2
C/ACCESS.bus Cable to iPort and your I
2
C device. If
your device does not have the matching connector(#15830064)
you can cut the end of the cable and attach the individual wires
to your device or you can purchase our clip-lead cable
(#CABCL).
