I2C/EEPROM Interface (I2C)
2-4
2.5 I
2
C/EEPROM Interface (I
2
C)
This interface allows a host computer to interact with a target E
2
PROM or other
I
2
C interface device such as a battery monitor device through a two-wire I
2
C
interface. The interface contains a controlled power pin, the I
2
C clock and data
lines, and a ground reference.
Pin Name Description
1 GND Ground return. Connected to the SMD and HDQ GND.
2 SCL I
2
C clock. This line must be pulled up by the target.
3 SDA I
2
C data. This line must be pulled up by the target.
4 VOUT Controlled EEPROM power. Supplies 5 VDC to a target EE-
PROM IC
2.6 SMBus Interface (SMBus)
Pin Name Description
1 GND Ground reference
2 SMBC SMB clock pin. This pin is pulled to 3.3 VDC through a 10-kΩ re-
sistor. Do not exceed 5.6 VDC on this pin.
3 SMBD SMB data pin. This pin is pulled to 3.3 VDC through a 10-kΩ re-
sistor. Do not exceed 5.6 VDC on this pin.
4 NC Not connected on this board. This pin is floating.
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