2.9 I2C
The T2080 device supports up to four I2C buses, in order to make the I2C resources equally available to both local and remote
systems. The T2080RDB-PC uses I2C1 port to access onboard devices, such as DDR3 DIMM, RTC, I2C EEPROM, clock
generator, thermal sensor (ADT7481), and core power regulator (LTC3882). The I2C2 bus uses multiplexers to partition the I2C
bus into several subbuses, called channels. Two SFP+ optics use channel 0-1 and the PCIe SLOT use channel 3.
The image below shows the I2C subsystem.
FET Isolation
(TRLML6346)
I2C1
I2C1_SCL
3V3
2V5
DDR3 DIMM
ADT7481
(Thermal Sensor)
AT24C256
DSI339U
IDT9FGV0641
LTC3882
I2C_ADDR=0x51
SFP+ optics
NOT USE
SFP+ optics
PCle SLOT
I2C2_SFP1SCL
I2C2_SDA
I2C2_SCL
I2C2
Channel 3
Channel 2
PCA9546
Channel 1
Channel 0
I2C_ADDR-0X77
T2080
I2C1_SDA
I2C2_SFP1_SDA
I2C2_SFP2_SCL
I2C2_SFP2_SDA
I2C2_CHAN2_SCL
I2C2_CHAN2_SDA
I2C2_PEX4S_SCL
I2C2_PEX4S_SDA
I2C_ADDR=0x4C
I2C_ADDR=0x50
I2C_ADDR=0x68
I2C_ADDR=0x6A
I2C_ADDR=0x63
I2C_ADDR=
0x50
I2C_ADDR=
0x50
2V5
Figure 12. I2C subsystem
NXP Semiconductors
Architecture
QorIQ T2080 Reference Design Board (T2080RDB-PC) User Guide, Rev. 1, 08/2021
User Guide 18 / 44
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