The example below shows a TPS389C03-Q1 monitoring two voltage supply rails on the TPS389C0XEVM. Please follow the steps in Section 2.2 and Section 3.1.1 before evaluating the TPS389C0XEVM. Below, Figure 3-4 shows how the TPS389C0XEVM was setup to monitor two voltage supply rails.

Figure 2-4 TPS389C0XEVM Monitoring Two Voltage Supply Rails

1. Connect 5 V to turret MON2 and 3.3 V to turret MON3 of TPS389C0XEVM.
2. Connect the TPS389C0XEVM VDD and VAUX inputs to a 3.3 V external power supply. Note that the voltage and current limits of the power supply must be set at 3.3 V and 10 mA.
3. Connect the TPS389C0XEVM with TI's USB2GPIO USB Interface Adapter ribbon to J18 (USB2GPIO connector). Connect the USB plug from the USB Interface Adapter to the USB port of the computer. The TI USB Interface Adapter communicates to the TPS389C03-Q1 IC via I²C protocols.
4. Verify that the jumper settings, highlighted in red in Figure 3-4, are set on the TPS389C0XEVM.
5. Ground turrets (RS_4, RS_3, RS_1/2).
6. Final Connections must look similar to Figure 3-4.
7. Note that the WDE pin of TPS389C03-Q1 is grounded due to pull down resistor R33, this disables the watchdog until a voltage is applied to the MON1/WDE turret.
8. Open up the Fusion Digital Power Designer GUI on the computer and follow Section 3.2.
9. Once the EVM is discovered and Click to Configure has been selected, the GUI is similar to Figure 4-12, Figure 4-13, Figure 4-14.
10. Once the GUI is open, press Refresh All (shown in the highlighted green-box). This commences a read operation of all the registers of TPS389C03-Q1 and updates the interface to reflect the most up to date information.
11. Press Start Polling (shown in the highlighted red-box) and both the Telemetry and the graphical waveform of the monitored inputs (shown in the highlighted orange-boxes) begin to display data in real time.
12. If one of the monitored inputs senses a fault, then an interrupt indicator is displayed (illumination of a red LED) on the TPS389C0XEVM. Also, one of the bit registers found in the Status Registers sub-window (shown in the highlighted blue-box) also shows a fault in red color.
13. To clear the fault interrupt, press Stop Polling, go to the Status Registers sub-window, locate the red color fault interrupt and click on CLR. Then click on Write to Hardware. This procedure clears the fault interrupt and allows the device to continue to monitor the input channels.
14. If the user wants to enable or disable monitoring, then scroll to the bottom of the Interrupt Enable sub-window and disable the desired monitoring inputs by clicking the boxes in the Enable row (shown in the highlighted black-box). Once the desired monitors are enabled click Write to Hardware and the USB Interface Adapter communicates to the TPS389C03-Q1 IC.
15. If the user wants to adjust the under voltage (UV) and over voltage (OV) threshold values, then locate the Voltage Range and Threshold sub-window (shown in the highlighted yellow-box). Use the boxes located in this sub-window to select the desired voltage thresholds. One note is that any monitoring inputs that are higher than 1.5 V, select 4x in the Voltage Scaling (1Fh) field. Once the desired monitor thresholds are set, press Write to Hardware and the USB Interface Adapter communicates to the TPS389C03-Q1 IC.
16. Steps 14 and 15 require that polling is halted to complete the desired I2C write operation.
17. Steps 10 through 15 refer to Figure 3-5 below.

Figure 2-5 TPS389C0XEVM GUI Setup for Monitoring Two Voltage Supply Rails