COMe-mEL10 - User Guide Rev. 1.1
// 43
4/
System Resources
4.1.
I2C Bus
The following table specifies the devices connected to the accessible I2C bus including the I2C address. The I2C bus is
available at the COM Express® connector pin A83, I2C_CK and pin A84, I2C_DAT.
Table 19: I2C Bus Port Address
8-bit
Address
7-bit
Address
Used For
Available
Description
58h
2Ch
Internally reserved
No
A0h
50h
Module EEPROM
YES
AEh
57h
Carrier board EEPROM
Optional
64h
32h
External RTC
Optional
4.2.
System Management (SM) Bus
The 8-bit SMBus address uses the LSB (bit 0) for the direction of the device.
Bit0 = 0 defines the write address
Bit0 = 1 defines the read address
The following table specifies the 8-bit and 7-bit SMBus write address for all devices.
Table 20: SMBus Address
8-bit
Address
7-bit
Address
Device
Description
5Ch
2Eh
HWM NCT7802Y
Hardware Monitor.
Do not use this address for external devices under any circumstances!
