Analog Devices ADICUP3029 User manual

EVAL-AD5940 Evaluation Kit User Guide
UG-1292
One Technology Way •P. O. Box 9106 •Norwood, MA 02062-9106, U.S.A. •Tel: [phone] •Fax: [phone] •
www.analog.com
AD5940 Evaluation Kit User Guide
Rev. 0 | Page 1 of 27
FEATURES
Debug and programming capability for AD5940
Evaluation capabilities for bioelectric and electrochemical
measurements
SensorPal GUI user guide for electrochemical and bioelectric
measurements
EVALUATION KIT CONTENTS
EVAL-AD5940BIOZ evaluation kit
EVAL-ADICUP3029
EVAL-AD5940ARDZ
AD5940-BioElectric
ECG snap connector to micro USB cable
Micro USB to USB cable
EVAL-AD5940ELCZ evaluation kit
EVAL-ADICUP3029
EVAL-AD5940ARDZ
AD5940Sens2
MicroUSB to USB cable
GENERAL DESCRIPTION
This user guide refers to the AD5940 evaluation kit. The boards
included allow the evaluation of the AD5940 and all its features.
The ADICUP3029 board is an Arduino form factor motherboard
containing the ADuCM3029 microcontroller that runs sample
firmware and communicates with the AD5940.
The EVAL-AD5940ARDZ board is designed to be versatile and
enable different measurements, such as bioelectric, electrochemical,
and potentiostat measurements. This is made possible by the
expander board headers. The AD5940 kit contains two expander
boards. The AD5940-BioElectric for bioimpedance and
biopotential measurements, and the AD5940Sens2 for
amperometric and impedance measurements.
The evaluation kit also includes custom USB to ECG cables to
connect the kit to the human body for bioelectric and biopotential
measurements.
LIMITATIONS ON USE AND LIABILITY
The application described in this application note is specific to the AD5940 and the AD8233 for use with the E VA L -
ADICUP3029 evaluation board. In addition to the terms of use contained in the evaluation board user guides, it is understood and agreed
to that the evaluation board or design must not be used for diagnostic purposes and must not be connected to a human being or animal.
This evaluation board is provided for evaluation and development purposes only. It is not intended for use or as part of an end product.
Any use of the evaluation board or design in such applications is at your own risk and you shall fully indemnify Analog Devices, Inc., its
subsidiaries, employees, directors, officers, servants and agents for all liability and expenses arising from such unauthorized usage. You are
solely responsible for compliance with all legal and regulatory requirements connected to such use.

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TABLE OF CONTENTS
Features .............................................................................................. 1
Evaluation Kit Contents................................................................... 1
General Description ......................................................................... 1
Revision History ............................................................................... 2
Evaluation Hardware........................................................................ 3
E VA L-ADICUP3029.................................................................... 4
E VA L-AD5940ARDZ .................................................................. 4
AD5940-BioElectric..................................................................... 5
AD5940Sens2................................................................................ 5
SensorPal User guide........................................................................ 6
Installation......................................................................................6
Quick Test.......................................................................................7
Measurement Validation and Testing.........................................8
Tips and Tricks ........................................................................... 23
Troubleshooting.......................................................................... 24
Installing and Using IAR Workbench.......................................... 25
How to Download IAR.............................................................. 25
Running Example Firmware in IAR ........................................ 26
Viewing Measurement Results ................................................. 26
REVISION HISTORY
7/2018—Revision 0: Initial Version

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EVALUATION HARDWARE
Figure 1. EVAL-ADICUP3029
Figure 2. EVAL-AD5940ARDZ
Figure 3. AD5940-BioElectric Evaluation Daughter Card
Figure 4. AD5940Sens2 Daughter Card
Figure 5. AD5940 Impedence Test Board
Figure 6. USB to Micro-USB Cable
Figure 7. Custom ECG Cables

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EVAL-ADICUP3029
The E VA L -ADICUP3029 interfaces between the PC and
the AD5940. It features an on-board debugger and can be
powered from either the USB cable or by batteries. The power
supply option is selected by Switch 5.
Board Setup
Unpack the board and ensure S2 is switched to USB position.
Ensure S5 is switched to wall/USB (see Figure 8).
Figure 8. EVAL-ADICUP3029
Connect the board to the PC via the USB cable. It automatically
installs the required software drivers. Click on the pop up for
details on the driver installation (see Figure 9).
Figure 9. ADICUP3029 Drivers
Ensure the four drivers shown in Figure 9 are installed correctly
before proceeding.
If the mbed serial port fails, install the drivers manually from
the mbed website.
To check if the drivers installed, correctly navigate to the device
manager. Navigate to Portable Devices > DAPLINK and Ports
> mbed Serial Port (see Figure 10). The COM port number is
required for connecting to serial capture program such as
RealTerm and SensorPal graphical user interface (GUI).
Figure 10. Device Manager
For further information about the E VA L -ADICUP3029, visit
the E VA L-ADICUP3029 product page.
Downloading Firmware
The ADICUP3029 provides an interface to download firmware
to the part without any IDE or software. When the board is
connected to the PC, the DAPLINK(D:) appears in Windows®
Explorer (see Figure 11). Drag and drop a .hex file into this
drive, and the firmware automatically downloads to
the ADuCM3029 microcontroller. Reset the microcontroller to
begin executing the firmware.
Figure 11. DAPLINK Drive
EVAL-AD5940ARDZ
Power Supply
The evaluation board is laid out to minimize coupling between
the analog and digital sections of the board. To this end, the
ground plane is split with the analog section on the bottom half
and a digital section on the top half of the board.
AVDD and DVDD can be powered either from the same supply
or separately with the following options:
•3.3 V directly from the Arduino connector
•DVDD: JP2 jumper in Position A
•AVDD: JP3 jumper in Position A
•3.3V connected to P13 (DVDD) and P17 (AVDD)
•DVDD: JP2 jumper in Position C
•AVDD: JP3 jumper in Position C
•ADM7155ACPZ LDO
•DVDD: JP2 jumper in Position B
•AVDD: JP2 jumper in Position B
•JP4 between Pin 2 and Pin 3 to enable LDO
•ADP160AUJZ LDO
•DVDD: JP2 jumper in Position B
•AVDD: JP2 jumper in Position B
•JP5 between Pin 2 and Pin 3 to enable auxiliary LDO
•Remove R13 and add 0 Ω resistor to R14.

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•Add R18 and R19. Calculate R18 and R19 using the
following equation:
VOUT = 1.0 V (1 + R18/R19) + R18
For further clarity, refer to EVA L -AD5940ARDZ.pdf, located in
the AD5940Firmware&Documentation folder.
Figure 12. EVAL-AD5940ARDZ
Default Jumpers
The default jumper settings are shown in Figure 12. Both DVDD
and AVDD are powered by 3.3 V from the Arduino shield (JP2
and JP3 in Position C).
JP1 controls the reset signal and has two jumpers in Position A
and Position C, respectively. Position A connects the AD5940
reset pin to the reset button. Position C connects the AD5940
reset pin to a general purpose input/output (GPIO) on
the ADuCM3029 microcontroller.
Table 1. Default Jumper Descriptions
Jumper Description
JP4, JP5 Enable the low dropouts (LDOs); By
default, the LDOs are disabled
JP14 Enable I2C electrically erasable
programmable read-only memory
(EEPROM)
JP10 Powers LED
JP6 Power IOVDD
P7, P8, P9, P10, P11,
P14, P15, and P16
Connect AD5940 GPIOs to Arduino
header and to the ADuCM3029
AD5940-BIOELECTRIC
The AD5940-BioElectric board is designed specifically for
bioimpedance and biopotential measurements. The board
contains the AD8233 heart rate monitor, isolation capacitors
and limit resistors necessary for bioelectric measurements. For
further details, refer to AN-1557 in the Application Notes
folder.
AD5940SENS2
AD5940Sens2 is designed specifically for 2- and 3-wire impedance,
amperometric, and potentiostat measurements. The board
contains two resistor capacitor (RC) networks (Test 1 and Tes t 2 ) to
verify measurement sequences. There is also a USB connector
that provides an option to connect custom cable to the board. By
default the board is configured to measure Test 1. Details on the
supported measurements can be found in AN-1563.

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SENSORPAL USER GUIDE
INSTALLATION
SensorPal is a light weight, easy to use desktop tool to rapidly
configure the AD5940 carry out measurements.
The AD5940_Firmware&Documentation directory contains a
GUI folder. SensorPal installer is located in this folder. To install
SensorPal, take the following steps:
1. Run the SensorPal Installer_vXXXX.exe installer and
follow on-screen instructions to install the program.
2. An Analog Devices folder is automatically created in the C
drive on your PC. Navigate to C:\Analog Devices\SensorPal\
Firmware Files (the default install path for the SensorPal
GUI).
3. Connect the ADICUP3029 and AD5940 to the PC and
navigate to C:\Analog Devices\SensorPal\Firmware Files
(the default install path for GUI).
4. Drag and drop the SensorPal-Firmware.hex file onto the
DAPLINK (D:) drive. This installs the required firmware
onto the ADICUP3029 so it will work with the GUI.
5. Power cycle the ADICUP3029 board by pressing the URST
button on the EVAL-AD5940ARDZ board.
6. After SensorPal is installed on the PC, open the SensorPal
GUI. A window similar to Figure 14 is displayed. Upon the
first time opening the GUI, the graph and tool belt are
blank.
7. Select the COM port that the ADICUP3029 is connected to.
It should read: If unsure of the COM port number refer to the
Board Setup section. If the correct COM port does not
appear in the dropdown menu right away, click the arrows
to the right of the dropdown to refresh the list of ports (see
Figure 13). If the port still does not appear, close the
SensorPal GUI, power cycle the board, then reopen
SensorPal and try again.
Figure 13. COM Port Dropdown Menu and Refresh Button
Figure 14. SensorPal

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QUICK TEST
After the AD5940 evaluation kit is set up and the SensorPal
software is installed, perform a quick out-of-the-box test to
ensure the board is set up and working properly. As an example,
quickly test the body impedance measurements by taking the
following steps:
1. Plug the AD5940ARDZ into the ADICUP3029 via the
Arduino connectors.
2. Plug the ADICUP3029 into the PC via the microUSB port
on the board.
3. Plug the AD5940-BioElectric evaluation daughter card into
the AD5940ARDZ board.
4. Plug the AD5940 impedance test board into the microUSB
port on the AD5940-BioElectric evaluation daughter card
as in Figure 15.
Figure 15. Body Impedance Hardware Test Setup
5. On the bottommost bank on the impedance test board
(labeled S1 and the only horizontal bank on the board),
press switch number 1 (the leftmost switch) downwards
using a paperclip or pencil to activate a 100 Ω resistance
value.
6. Open the SensorPal GUI and ensure the correct COM port
is connected.
7. Under the Bio-Electric Techniques section in the tool belt,
drag the Body Impedance measurement into the work
area. Delete any other existing measurements in the work
area by hovering over the measurement and pressing the
trash bin icon in the bottom right corner.
8. Click the Body Impedance measurement to highlight it
and view the configurable parameters beneath (keep all
default parameter values).
9. Press the green Measure button to begin collecting data
until the measurement is complete.
10. The resulting graph looks similar to the one in Figure 16,
with the impedance measurements very close to 100 Ω.
Figure 16. Quick Test Body Impedance Result

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MEASUREMENT VALIDATION AND TESTING
Body Impedance
The 4-wire bioimpedance analysis (BIA) approach uses a high
precision excitation voltage source to excite the sensor with a
known high frequency voltage, VAC . The response current (I) is
measured and the impedance (Z) is calculated by the following
equation: Z = VAC /I.
The AD5940 impedance test board is used to validate the
accuracy of the AD5940 measurements. The impedance test
board features an array of standard valued resistors and capacitors,
which are separated into banks labeled S1, S2, S3, S4, and S5.
Any of the resistor values can be used for body impedance tests.
The S1 bank on the board is highlighted in Figure 17 for
reference.
Figure 17. AD5940 Impedance Test Board with S1_2 Activated
A schematic of the S1 bank is shown in Figure 18, with units in
ohms (Ω). R1 in the schematic corresponds to Switch 1 on the
S1 bank (S1_1). The full schematic of the impedance test board
can be found here. The S2, S3, S4, and S5 banks on the board
can additionally be used to simulate contact impedance on the
electrodes.
Figure 18. AD5940 Impedance Test Board S1 Bank Schematic
Select the desired resistor value to test by pushing the switch
downwards toward the row of numbers (1 to 12) on the S1 (or
S2, S3, S4, or S5) bank. Use a paperclip (or another thin, pointed
object) to change the switches by moving the switches back and
forth. Multiple resistors can be selected simultaneously to put the
resistors in series and increase the total equivalent resistance.
To perform a body impedance validation test using
the AD5940 evaluation board, take the following steps:
1. Plug the AD5940ARDZ into the ADICUP3029 via the
Arduino connectors.
2. Plug the ADICUP3029 into the PC via the microUSB port
on the board.
3. Plug the AD5940-BioElectric evaluation daughter card into
the AD5940ARDZ board as in Figure 19.
4. Plug the AD5940 impedance test board into the microUSB
port on the AD5940-BioElectric evaluation daughter card
as in Figure 19.
Figure 19. Body Impedance Hardware Setup
5. Select the desired resistor value on the Z Test Board using
the S1 bank switches. The resistor selected for this test was
the S1_2 resistor, which has a value of 200Ω.
6. Ensure the ADICUP3029 is connected to the PC via the
micro-USB port.
7. Open the SensorPal GUI and ensure the correct COM port
is selected.
8. Under the Bio-Electric Techniques section in the tool belt,
drag the Body Impedance measurement into the work
area. Delete any other existing measurements in the work
area by hovering over the measurement and pressing the
trash bin icon in the bottom right corner.

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9. Click the Body Impedance measurement to highlight it
and view the configurable parameters beneath. The body
impedance parameters that can be set are shown in Table 2
10. Once the desired parameters are set, press the green
Measure button to begin collecting data.
11. The results are the absolute impedance value and
force/sense out the isolation components in the paths on
F+ and F−
Table 2. Body Impedance Measurement Parameters
Parameter Description Value for Test
Internal RTIA Selection Resistor value in the feedback loop of the transimpedance amplifier. 1 kΩ
Transimpedance Amplifier
Capacitance
Capacitor value in the transimpedance amplifier (depends on the
maximum current range)1.
16 pF
Calibration Resistor
Known impedance value voltage is applied to for system calibration.
10000 Ω
Start
Initial frequency of the voltage applied.
10000 Hz
Stop Highest frequency of the voltage applied. 10000 Hz
Points Number of different frequencies (sampling points) between start and stop. 50
Logarithmic When a frequency sweep is performed, defines whether the frequency
increments are logarithmic or not.
Yes
Power Mode Power level of the board. Automatic
Filter Level Level of the SINC filter applied to data coming from the analog-to-digital
converter (ADC).
Level 1.1—SINC3 OSR2
Hanning Window Selects whether the data is filtered through a Hanning window or not. Yes
DFT Number Level of the discrete Fourier transform applied to the data. 16384
Amplitude Magnitude of the voltage applied. 800 mV-pp
PGA Gain Select Programmable gain amplifier. GNPGA_1_5
Resistor on Impedance Test Board Resistance being measured. 200 Ω
1For more information on Body Impedance measurements on the AD5940, refer to the AN-1557.
Figure 20. Measurement Block Diagram
F+
F-
S-
S+

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Figure 21. Bioelectric Board Electrode Schematic
12. When the software has finished collecting data, the resulting
graph looks similar to the one in Figure 22 (sampled at one
frequency). As in the Figure 22, the impedance value,
whether sampled at one frequency or over a range of
frequency, should be nearly equal to the total equivalent
resistive value selected on the Z test board (in this case 200 Ω).
Figure 22. BIA Validation Test Result—200 Ω on Impedance Test Board
If using electrodes to measure body impedance on an equivalent
sensor, or body simulator, the leads on the custom ECG cable
provided are as in Figure 23. Connect the F+ and S+ electrodes
to positive side and connect F− and S− to the negative side.
Figure 23. Custom Cables
Electrodermal Activity
Electrodermal activity (EDA) refers to the continuous changes
in the electrical conductivity of the skin that occur as a result of
sweat secretion by the body. For example, during high stress,
the sweat glands in the body are activated, causing the surface
of the skin to become wet and thus more conductive. Such a
change reduces the skin’s overall impedance.
The AD5940 impedance test board is used to validate the
accuracy of the EDA measurements and is shown in Figure 24.
The impedance test board features an array of standard valued
resistors and capacitors, which are separated into banks labeled
S1, S2, S3, S4, and S5. A full schematic of the impedance test
board can be found in the schematics folder. High-value
resistors in the range of 10 kΩ to 10 MΩ can be used for EDA
tests. These resistance values are located from S2 switch 5 (R25)
to S2 switch 10 (R30) on the S2 bank and from S3 switch 6
(R36) to S3 switch 10 (R40).
Figure 24. AD5940 Impedance Test Board with S2 and S3 Highlighted
Select the desired resistor value to test by pushing the switch
downwards toward the row of numbers (1 to 12) on the desired
bank. The switches can be easily changed using a paperclip (or
other thin, pointed object) to move the switches back and forth.
Multiple resistors can be selected simultaneously to put the
resistors in series and increase the total equivalent resistance.
To perform an EDA validation test using the AD5940
evaluation board, follow the instructions below: