Kontron SMARC-sA3874i - Manual (Page 42)

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User’s Guide
All five I2C busses originate in the multi-master capable I2C controllers within the TI Cortex A8 SoC. The only I2C
devices on the sA3874i Module are on the I2C PM bus. Those devices and their address details are listed in the
following table:
# Device Description Ref Des Address
(7 bit)
Address
(8 bit)
Notes
Read Write
I2C_PM Bus
1 TI TPS65911C PMU U15 0x2D 0x5B 0x5A General purpose usage
address
0x12 0x25 0x24 Voltage scaling address
2 On Semi NCT72 Thermal Sensor U26 0x4C 0x99 0x98 2 temperatures can be
read:
CPU Thermal diode
+board ambient
3 Atmel AT24C02 EEPROM U24 0x50 0xA1 0xA0 General purpose
parameter EEPROM
Serial number, etc in
PICMG EEEP format
4 Altera
5M240ZM100C5N CPLD U20 General purpose logic
As the name implies (PM == “Power Management), this I2C bus is used by low level software for system power
management. PMU regulator is attached to this bus and various voltage levels and options are continuously
modified over this interface. So – use care if accessing this interface.