Application Note
4 of 63
V 1.2
2018-12-12
5 Output PMIC Controller/ IRPS5401
User guide with DB295 and DB296 demo boards
2
I2C ADDRESS, PMBUS address, and address offset
The IRPS5401 has 2 addresses; an I2C address for direct register read write access and a PMBus address for
sending PMBus commands. With the IRPS5401 powered up and the GUI communicating with the USB dongle
(1), you should be able to hit the Auto-populate button (2) and have the GUI recognize and populate the
IRPS5401 information (3). You can also use the address scan feature (4) to scan all addresses and see what
responds (5).
Figure 2
Example figure
The base I2C and PMBus addresses are located in register 0x0020. The PMBus address bits are [6:0] and the I2C
address bits are [14:8]. Before these addresses can be updated, the register must be unlocked by setting REG
0x0086 bit [2] to 0. The PAGE command is used so that 1 common PMBus address can be used to access all 5
outputs.
