ISL28022EVKIT1Z Evaluation Kit Part 1 – Getting Started

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Hello. Today, I'm going to discuss a quick demo on how to work the ISL28022 starter kit. In your starter kit, you receive three boards. One, a dongle board. Two, an Rload board. And three, a generic, non-configured ISL28022. The dongle board has a microcontroller on the back, and three DPMs connected to it. The circuitry around this converts the USB power to a set supply voltage. The first one converts it from five volts, from the USB power, to 3.3. The second one is USB power to 12V. The third one is USB power to a point-of-load voltage. You can choose the point-of-load voltage from the GUI.

Connecting this by itself doesn't really measure any current from the power supplies without any load. Our load board, connected to the dongle, will exercise each of the power supplies. Our load board has three DCPs on it. They're ISL23445s. The user can configure to use the DCP to load the power supplies, or they can connect the power supplies to an auxiliary circuit. For this purpose today, I connected a heavier load to the auxiliary circuit.

Now next, we will connect the USB to the dongle, and with the ISL, our load board...And choose the software. After selecting the software, the software pops up a dialog box: Single Site Demo Software, ISL28022. To connect the PC to the dongle, you press the "Connect to Device". If you successfully connected, you would see a "Disconnect to Device". Press that button again, you would disconnect the PC from the dongle. The dongle and the software senses what's connected to the dongle board at the other end. If it's a ISL28022 non-configured, the front panel will be highlighted and enabled. If it isn't, then the front panel is disabled as shown. In this case, it sensed that the Rload board is connected to the dongle.

To start the demo, press "Start Rload". Two dialog box, or two windows appear. One, being just a window that monitors the supply voltage: 3.3, 12, and point-of-load. Press it once, you can see 3.3, 12, and 2.5. If you wanted to adjust the point-of-load voltage, you can, by pressing the combo box and adjusting it. In this case, I'll choose .8. And as you can see, 800mV appears on the point-of-load, measured.

The user has the option to make their own voltage at the point-of-load, by populating the resistor in R7 of the dongle board, and choosing the "Aux" selection. How to select the voltage, and choosing the right resistor value, is discussed in the paper write-up of the starter kit.

Next, an Rload adjust board. By selecting the jumpers to pin one and two to short, you are routing the power supplies to the DCP. This dialog box controls the DCP ohmic resistance. Entering in values within the range of the Rloads required for each of the loads and pressing "Apply" will change the value of the DCP.

Measuring once again, we'll see that the values have changed, the current values. There you go. As you can see, the current value has changed. So this is a quick exercise of showing how to exercise the ISL28022, and what it does, real quickly. Next, we will connect the non-configured ISL28022.