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Hardware Configuration
Pull-up Resistors
The
iPort/AFM Host Adapter includes a slide switch used to enable or
disable internal 1.8K ohm Pull-Up resistors on the SCL, SDA, and INT lines.
Every I
2
C Bus system must have at least one Pull-Up on each line. Use this
switch to configure the iPort/AFM 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 uses 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/AFM (#MIIC-203) 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/AFM to connect.
2. Connect the power supply provided or see Interconnect Section +5VDC
Power Jack.
3. Connect I
2
C Interface Cable to iPort/AFM 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).
4. Connect INT line if used.