I2C Bus Addresses

VCU128 Evaluation Board User Guide (UG1302)

Document ID
UG1302
Release Date
2022-05-06
Revision
1.2 English

User applications that communicate with any of the I2C bus I2C0 downstream devices must first set up a path to the desired target device through the appropriate bus switch: I2C0 U55 PCA9544A, address 0x75 (0b111101); U53 TCA9548A, address 0x74 (0b1110100), or U54 TCA9548A, address 0x76 (0b111110), respectively. The following table lists the address for each bus.

Table 1. I2C Bus Addresses
I2C Devices I2C Switch Position I2C Address Device
Binary Format Hex Format
I2C0 Bus
PCA9544A 4-channel bus switch N/A 0b1110101 0x75 U55 PCA9544A
PMBus INA226 power monitor 1 0

0x40-0x42

0x46-0x48

0x4C-0x4D

INA226 U14,U16,U20,U21, U79,U84,U85,U86
Not used 1 N/A N/A N/A
PMBus regulators 1 2

0x60-0x65

0x68-0x6B

Various Intersil regulators U3,U12,U15,U22,U24,U25,U29,U31,U36,U44,U67,U68
FPGA SYSMON 3 0b0110010 0x32 U1 BANK 65
I2C0 Bus
TCA9548 8-channel bus switch N/A 0b1110100 0x74 U53 TCA9548A
I2C EEPROM 0 0b1010100 0x54 U48 M24C08
SI5328 clock 1 0b1101000 0x68 U87 SI5328B
Not used 2 N/A N/A N/A
QSFP1 Si570 clock 3 0b1011101 0x5D U95 SI570
QSFP2 Si570 clock 4 0b1011101 0x5D U90 SI570
QSFP3 Si570 clock 5 0b1011101 0x5D U82 SI570
QSFP4 Si570 clock 6 0b1011101 0x5D U80 SI570
Not used 7 N/A N/A N/A
I2C0 Bus
TCA9548 8-channel bus switch N/A 0b1110101 0x76 U54 TCA9548A
FMCP HSPC (FMC Plus) 0 0bXXXXXXX 0x## J18 FMCP HSPC
Not used 1 N/A N/A N/A
FPGA SYSMON 2 0b0110010 0x32 U1 BANK 65
Not used 3 N/A N/A N/A
QSFP1 module 4 0b1010000 0x50 J42 28 Gb/s QSFP+
QSFP2 module 5 0b1010000 0x50 J39 28 Gb/s QSFP+
QSFP3 module 6 0b1010000 0x50 J35 28 Gb/s QSFP+
QSFP4 module 7 0b1010000 0x50 J32 28 Gb/s QSFP+
  1. See Onboard Power System Devices.

Information about the PCA9544A, TCA9548, and TCA6416A is available on the TI Semiconductor website.