S&T Kontron COMe-bTL6, User Manual, Page: 48 / 101

COMe-bTL6 - User Guide. Rev. 1.5
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4/ System Resources
4.1. I2C Bus
The following table specifies the devices connected the accessible I2C bus including the I2C address. The I2C bus is
available at the COM Express® connector pin B33, I2C_CK and pin B34, I2C_DAT.
Table 35: I2C Bus Port Address
8-bit Address 7-bit Address Used For Available
58h 2Ch
Internally reserved
No
A0h 50h
Module embedded EEPROM (Eeep)
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 36: SMBus Address
8-bit Address 7-bit Address Device Description
A0h 50h DDR4 channel A EEPROM SODIMM
A4h 52h DDR4 channel B EEPROM SODIMM
A6hh 53h DDR4 Channel C EEPROM (only optional) SODIMM (option)
5Ch 2Eh Hardware Monitor NCT7802Y
Do not use this address for external
devices under any circumstances