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3. I
2
C Interface Connector
The iPort/AFM Host Adapter includes a four wire, positive locking, modular
connector (see Appendix A for more info on these parts) for interfacing to an
external I
2
C Bus. Lines provided include I
2
C Clock (SCL), Data (SDA),
Ground, and +5VDC.
Receptacle Connector
An I
2
C Interface Cable (White=SCL, Red=+5VDC, Green=SDA,
Black=Ground) is provided to connect to a external I
2
C Bus. Since there is
no standard I
2
C Bus connector, you may want to cut off one end of the cable
and add a connector compatible with your target system.
Additional I
2
C Interface Cables (4 ft., 8ft., or 16 ft.) and above mentioned
modular connectors are available from MCC. Clip Lead cables are also
available. (see Appendix A)
4. INT, Interrupt Signal Control
The iPort/AFM provides an open drain input/output (INT) which can be
connected to a corresponding pin on a master or slave. The INT Signal
allows the iPort/AFM to participate in INT master and/or slave
communications.
___
An interrupt output (INT=low) is generated upon receiving an iNterrupt
assert command from the host computer. Resetting and reactivating the
interrupt signal is achieved when a release command is received from the
host computer or data is read from or written to the iPort/AFM when
addressed as an I
2
C Bus slave.
Interrupt monitoring is enabled upon receiving an enable command from the
host computer. Interrupt monitoring causes the iPort/AFM to send
notification to the host computer when the INT signal changes state.