SUPER MICRO Computer MIIC-203 manual Connecting to a 3.3v System, Connecting to an SMBus System

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 I2C 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 I2C Interface Cable to iPort/AFM and your I2C 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.

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