Xilinx Zynq UltraScale+ ZCU208 - Page 64

Each Inneon PMIC controller is capable of reporng the voltage and current of its controlled rail
to the Inneon GUI for display to the user. Fourteen rails have a TI INA226 PMBus power
monitor circuit with connecons to the rail series current sense resistor. This arrangement
permits the INA226 to report the sensed parameters separately on the INA226_PMBUS. The
rails congured with the INA226 power monitors are shown in Table 25.
As described in I2C0 (MIO 14-15), the I2C0 bus provides access to the PMBus power controllers
and the INA226 power monitors through the U17 PCA9544A bus switch. All PMBus controlled
Inneon regulators are ed to the IRPS5401_SDA/SCL PMBUS, while the INA226 power
monitors are separated on to INA226_PMBUS.
Figure 7 and Table 10 document the I2C0 bus access path to the Inneon PMBus controllers and
INA226 power monitor op amps. Also refer to schemac 038-05003-01. Power rail
measurements are accessible to the system controller and RFSoC PL logic through their
respecve I2C0 bus connecons.
Chapter 3: Board Component Descriptions
UG1410 (v1.0) July 8, 2020 www.xilinx.com
ZCU208 Board User Guide 64
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