ISL28022EVKIT1Z Evaluation Kit Part 2 – Monitoring

Added on 7月 16, 2014

Learn how to connect the ISL28022 evaluation board to the dongle board and begin using your monitoring software.

Video Transcript

Next, we're gonna connect the non-configured ISL28022 to the dongle board. The two jumpers over here set the slave address of the ISL28022. ISL28022 can actually have 16 slave address from HEX80 to 9E. The software will actually go out once connected to the dongle board and sniff what slave address this port is configured to.

The jumper at the bottom configures the ISL28022 to either receive a external clock or to pinout or send an interrupt to the green connectors of the terminators. And finally, the jumper called VCC_SEL allows the user to either power the ISL28022 from the USB port or to select their own USB power. So now, we will just connect the non-configured ISL28022, to the dongle board.

I will restart the software. Once again, the dialogue box comes up to, or the window comes up, connect to the device and this time you see everything is enabled and it did successfully sense the ISL28022 and the slave address is 82. I have nothing connected to the device, so but just to show I can measure, I can see the device is measuring something. It's floating the device input so therefore you get an irrelevant voltage.

The measurement range, you can choose the measurement range. It can either be 60, 32, or 16, by choosing the combo box for the VBUS, and for the Vshunt it ranges from 40 to 300 mV. The conversion time for the ISL28022 ranges from 84µs to 68ms and that can be selected by each combo box. Where my mouse is right now, this is for the VBUS and this one is for the Vshunt.

The loop delay input is since the measurements are very quick, sometimes you cannot see on when starting to do collecting data, you cannot see the numbers very clearly so a user can actually induce a loop delay 0.1 and start collecting. And, as you can see the measurement has slowed down, but yet the acquisition time hasn't.

So, the ISL28022 has a threshold detector. It's a digital compare and it only senses the threshold or compares the voltage of the input to a level upon ADC conversion. There it is. As you can see, the dialogue box comes up and you can set the thresholds. I have nothing connected to it, so I'll set the thresholds above with the actual levels are being measured. There is only one range for the threshold comparator, 0 to 60, so the values of both thresholds have to be between 0V and 60V. Anything above it, the backlight will turn orange and anything below it, the backlight will turn blue. You can do this with the Vshunt threshold as well.

Now, if you would like to, the user can actually connect the interrupt to the output pin so you can send it to either a microcontroller or an enable pin. And if you just wanted to see, you can force the interrupt to the pin itself just to make sure it works.

Bring it from a high to a low. Once the thresholds have been configured and the routing scheme of the interrupt has been configured, you press OK. Measure once. And, as you can see, since I chose 40 and 50, the backlight for the VBUS turned blue. You can try the ISL28022 with an external clock or a system clock.

By choosing the external clock from the drop down menu, you can actually enable the external clock and configure the division frequency. So you can input about 4MHz of clock frequency into the device and divide the frequency down such that it matches the internal clock frequency, which is the internal system clock frequency when the external clock is not enabled. The native clock frequency for the 22 is 500KHz.

Overclocking the device will change the acquisition times or underclocking will do so as well. Selecting the Reset option from the ISL28022 will reset the device. And as you can see, remember we had 40 and 50 as threshold detectors, now its back from 0 to 60.

To add a current shunt or to enable the current measurements for the device, you press the Current Selection and enter in the sense resistor value. Since we have nothing connected to it, I'm just gonna enter 10 ohms just to demonstrate that the current works. You measure once and you can see that at 300µV, you get 300µA at 10ohms.

To enable the power, just click the Power checkbox and again, the backlight will turn on and it measures zero. Because V times I, zero times current is zero.

If you needed to or wanted to save a series of data points, one can do it by going into the file drop down box and pressing Save Data. Save Data will ask you to save a file. This will be the base file of your data and I'll say, DataDemo. This will save it in a *.csv file format. Dialog box pops up and asks how many points you'd like to save. I'll save 100. And once I press OK, that’s when the data collection begins. And as you can see, you saw that the numbers flicker and the data has been saved to the document.

Under the dongle drop down menu you get a USB Supply. If you ran the demo earlier, it's the same window used to run the demo. If a user wanted to configure a circuit around the dongle with the I2C, using I2C and the power supplies that dongle connector offers one could and then monitor the supply voltage. Under the dongle there is an I2C transaction. Again, if user took the dongle and created their own port with another I2C device, they could send commands manually to the device and re-commands manually from the device by choosing the I2C transaction.

All right, so if the user from the R-load, the R-load connected, didn't want to use the DCPs to source to exercise the power supplies being sourced by the dongle, they could easily switch out the routing of the power supply by selecting 2 and 3 of each of the headers as shown here. As mentioned earlier, I put a modest load on the device just to demonstrate that it can measure more than just 2mA of current. And once I measure, once you see 25mA, 10mA and 10mA.

This concludes the ISL28022 starter kit demo. Hoping you enjoyed it.