Using the System with IIO Oscilloscope

Now its time to start communicating with the EVAL-CN0540-ARDZ, so you can start streaming data. When you first open IIO-Oscilloscope you’ll see two windows.

1. CN0540 Plugin / DMM / DEBUG Window

2. IIO Capture Window

CN0540 IIO-Oscilloscope Plugin

The CN0540 IIO Plugin automatically configures the CN0540, so it is ready to use as soon as you run the application. Calibration of the sensor is also automatically performed so that a user can start using the capture window to collect and analyze data. No other configuration is required for the application.

If you want to re-calibrate the system, shut the system down, or modify individual registers of the devices on the CN0540 that can also be done either using the CN0540 Plugin or using the DEBUG panel to write/read specific registers. This is optional and typically application specific.

Below is a picture of what the CN0540 IIO Plugin looks like.

User interface

Section	User Control	Description	Value
Power Control	SW_FF	Checks the current status of the ADG5421’s FF Pin	Low (normal)
Power Control	SW_FF	Checks the current status of the ADG5421’s FF Pin	High (over voltage)
Power Control	Shutdown	Shutdowns power from the AD7768-1	Disabled (Power On)
Power Control	Shutdown	Shutdowns power from the AD7768-1	Enabled (Power Down)
ADC Driver Settings	FDA Status	ADA4945 Operational Status	Checked (Enable)
ADC Driver Settings	FDA Status	ADA4945 Operational Status	Un-Checked (Disabled)
ADC Driver Settings	FDA Mode	ADA4945 Power Mode	Checked (Full Power)
ADC Driver Settings	FDA Mode	ADA4945 Power Mode	Un-Checked (Low Power)
Sensor Calibrations	Calibration Result	The calibration is set for a 10V calibration	10.0 V
Sensor Calibrations	Input Voltage (mV)	Calibrated AD7768-1 input voltage offset	~0.0 V
Sensor Calibrations	Shift Voltage (mV)	Calibrated LTC2606 level-shifting voltage	~0.0 V
Sensor Calibrations	Sensor Voltage (mV)	Calibrated sensor input voltage	~10.0 V
Voltage Monitor	Vin+ (mV)	Input voltage coming from the sensor
Voltage Monitor	Vgpoi2 (mV)	Not Used	N/A
Voltage Monitor	Vgpoi3 (mV)	Not Used	N/A
Voltage Monitor	Vcom (mV)	ADA4945 common-mode input voltage	~2.5 V
Voltage Monitor	Vfda+ (mV)	AD7768‑1 Ain+ input voltage

IIO Capture Window

For CbM applications, most customers are typically interested in the frequency domain plots. To obtain a FFT plot, do the following:

1. Use the drop down menu labeled “Plot Type” and select “Frequency Domain”.

2. Set the number of samples to 16384.

3. Set the averaging to 3.

You should see a nice plot like this when connected to the CN0532 sensor.