• Number of EVMs
– Set the "Number of EVMs" drop-down menu to the number of EVMs currently in use.
• See
for how to attach multiple EVMs together.
• Changing this here also changes the same setting in the Configuration tab.
– The GUI only supports one EVM/device type at a time, up to 4 EVMs total.
– Switch settings
• Use the onboard switch(es) to select a different address/chip select for each EVM.
• Set the switch settings in the GUI to match the setting for each connected EVM.
– "EVM 1" will automatically populate with the lowest addressed device unless a setting has already
been selected.
– Changing this here also changes the same setting in the Configuration tab.
• If more than one device is being used, a "*" will appear next to the selected EVM that is being used on
the register map and configuration tabs.
– Changing the switch settings of any EVM sets that EVM as the selected EVM.
• Collect/Plots settings
– Collect Data
• Use the "COLLECT DATA" button to start data collection.
• In this mode, the MCU reads and sends the selected result values for each device over a USB BULK
channel. All results from one device are read before moving on to the next device.
– All result values from all EVMs together are considered one "sample set".
• Although you can read and write to other registers through the register map page while collecting data,
it is possible that this adds a delay to the data being collected.
• Use the "STOP COLLECT" button to stop collecting data.
– #Samples Only
• If this checkbox is selected, then the GUI will automatically stop collecting data after the number of
samples specified in the #Samples box have been collected.
• If not selected, the GUI will continue collecting data and only store the most recent #Samples.
– Delay between samples
• Sets the delay between the start of each sample set.
• Desired delay time may not be obtainable if it is set faster than the read loop, which depends on the
number of results being collected, the number of EVMs, and your CPU.
• Although you can read and write to other registers through the register map page while collecting data,
it is possible that this adds a delay to the data being collected.
– Auto Delay
• Sets delay based on conversion times, averaging, and number of channels being converted.
• If multiple EVMs are being used, the time put in the delay box will be from the EVM with the shortest
calculated delay value.
– Save All Plots
• Use the "SAVE ALL PLOTS" button to save the data for each currently selected result from the
"Results to collect/show" section in a spreadsheet.
• Use the "SAVE PLOT" button next to each plot to save just the data from that plot in a spreadsheet.
– Clear All Plots
• Use the "CLEAR ALL PLOTS" button to clear the data from all plots together.
• Use the "CLEAR PLOT" button next to each plot to clear the data from just that plot.
– #Samples
• Change the number in this box to change the number of samples shown in each plot.
– Changing this number clears out the plot buffers, so the plots will be cleared on the next read.
– Y-Axis Options
• Manual Scale
– Checking this box will set all EVM results in this plot to the same scale value specified by the Max
and Min fields.
– When this is not selected, each EVM will have it's own y-axis scale based on the min and max
value for that EVM's result values.
– For the DIETEMP Result, the units can also be toggled between °C and °F.
Operation
SBOU241C – APRIL 2020 – REVISED JULY 2021
INA228, INA229, INA237, INA238, and INA239 EVM User’s Guide
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