Voltage and current monitoring and control are available for the Infineon power system controllers through the Infineon PowIRCenter graphical user interface. The PMBus interface controllers and regulators are accessed through 1x3 PMBus connector J21, that is provided for use with the Infineon PowIRCenter USB cable (Infineon part number USB005) and can be ordered from the Infineon Integrated Circuits website. The associated Infineon PowerTool GUI can be downloaded from the Infineon website. This is the simplest and most convenient way to monitor the voltage and current values for the Infineon PMBus programmed power rails listed in Table 1.
Each Infineon PMIC controller is capable of reporting the voltage and current of its controlled rail to the Infineon GUI for display to the user. Fourteen rails have a TI INA226 PMBus power monitor circuit with connections to the rail series current sense resistor. This arrangement permits the INA226 to report the sensed parameters separately on the INA226_PMBUS. The rails configured with the INA226 power monitors are shown in Table 1.
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 Infineon regulators are tied to the IRPS5401_SDA/SCL PMBUS, while the INA226 power monitors are separated on to INA226_PMBUS.
Figure 1 and Table 2 document the I2C0 bus access path to the Infineon PMBus controllers and INA226 power monitor op amps. Also refer to schematic 038-05070-01. Power rail measurements are accessible to the system controller and RFSoC PL logic through their respective I2C0 bus connections.