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Table 35 : General Purpose I2C Interface Signal Descriptions
Signal
Pin#
Description
I2C_CK
B33
General Purpose I2C Clock output
Carrier Board:
3.3VSB I2C device - Connect to SCL of I2C
device.
3.3V I2C device - Connect 3.3V isolation
circuit controlled by COME pin B24 PWR_OK
to SCL of I2C device.
5VSB I2C device - Connect 5VSB Level
Shifter to SCL of I2C device.
5V I2C device – Connect an 5V isolation circuit
controlled by COME pin B24 PWR_OK to SCL
of I2C device.
N/C if not used
I2C_DAT
B34
General Purpose I2C data I/O line.
Carrier Board:
3.3VSB I2C device - Connect to SDA of I2C
device.
3.3V I2C device - Connect 3.3V isolation
circuit controlled by COME pin B24 PWR_OK
to SDA of I2C device
5VSB I2C device - Connect 5VSB Level
Shifter to SDA of I2C device
5V I2C device - Connect an 5V isolation circuit
controlled by COME pin B24 PWR_OK to SDA
of I2C device
N/C if not used
2.12.2 I2C Routing Guidelines
NA
I/O
I/O OD
CMOS
I/O OD
CMOS
１０１
Pwr Rail
Note
3.3V
Suspend
/ 3.3V
3.3V
Suspend
/ 3.3V
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