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: 781.329.4700 •Fax: 781.461.3113 •

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.

UG-1292 EVAL-AD5940 Evaluation Kit User Guide

Rev. 0 | Page 2 of 27

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

EVAL-AD5940 Evaluation Kit User Guide UG-1292

Rev. 0 | Page 3 of 27

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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Rev. 0 | Page 4 of 27

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.

EVAL-AD5940 Evaluation Kit User Guide UG-1292

Rev. 0 | Page 5 of 27

•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

EVAL-AD5940 Evaluation Kit User Guide UG-1292

Rev. 0 | Page 7 of 27

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

UG-1292 EVAL-AD5940 Evaluation Kit User Guide

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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.

EVAL-AD5940 Evaluation Kit User Guide UG-1292

Rev. 0 | Page 9 of 27

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+

UG-1292 EVAL-AD5940 Evaluation Kit User Guide

Rev. 0 | Page 10 of 27

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:

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