EVAL-ADPD4100Z-PPG User Guide UG-1795

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

Evaluating the ADPD4100/ADPD4101 Multimodal Front End

PLEASE SEE THE LAST PAGE FOR AN IMPORTANT WARNING AND LEGAL TERMS AND CONDITIONS. Rev. 0 | Page 1 of 14

FEATURES Board supports ADPD4100 and ADPD4101 population ADPD4100 (SPI) is the default board population All inputs and outputs are accessible to the user 3 separately driven green LEDs included 1 red and 1 IR LED included Metal baffle to block optical crosstalk Works with the Wavetool Evaluation Software allowing

Time domain graphing and logging Frequency domain graphing Statistical analysis Data streaming to other applications

EVALUATION KIT CONTENTS EVAL-ADPD4100Z-PPG evaluation board Ribbon cable Wrist strap, with hook and loop fastener

ADDITIONAL EQUIPMENT NEEDED PC running Windows® 7 or Windows 10 operating system EVAL-ADPDUCZ, Arm® Cortex®-M4 microcontroller

motherboard Optional: EVAL-ADPDM3Z, alternative Cortex-M3

microcontroller motherboard (available from the EVAL-ADPD2140Z product page)

ONLINE RESOURCES ADPD4100/ADPD4101 data sheet Wavetool Evaluation Software package

GENERAL DESCRIPTION The EVAL-ADPD4100Z-PPG evaluation board provides users with a simple means of evaluating the ADPD4100/ADPD4101 photometric front end.

The EVAL-ADPD4100Z-PPG evaluation board implements a simple discrete optical design for vital signs monitoring applica-tions, specifically wrist-based photoplethysmography (PPG).

The EVAL-ADPD4100Z-PPG has three green light emitting diodes (LEDs), one infrared (IR), and one red LED, all separately driven. A single 7 mm2 photodiode (PD) is populated on the board. The PD has no optical filter coating. However, a pin for pin alternative device with an IR block filter is available.

The full evaluation system includes the Wavetool Evaluation Software graphical user interface (GUI) that provides users with low level register access and high level system configurability. Raw data streamed to this tool can be displayed in real time with limited latency. Views are provided for both frequency and time domain analysis.

A user datagram protocol (UDP) transfer capability from the Wavetool Evaluation Software (available for download on the EVAL-ADPD4100Z-PPG product page) allows data stream connections and register configurability to external analysis programs, such as LabVIEW® or MATLAB®, in real time.

The EVAL-ADPD4100Z-PPG board is powered by the EVAL-ADPDUCZ microcontroller board (obtained from the EVAL-ADPD4100Z-PPG product page). In addition to the power requirements, serial port interface (SPI) (default) or I2C data streams are received from the ADPD4100 by the microcontroller. A ribbon cable connects the two boards. The microcontroller repackages the data, sending it to a virtual serial port over the USB to the PC, displayed on the Wavetool Evaluation Software. The EVAL-ADPD4100Z-PPG can also be connected directly to the microcontroller development system of the user, using the SPI for the ADPD4100 (or I2C for the ADPD4101).

The ADPD4100/ADPD4101 data sheet, available at www.analog.com, provides full specifications for the ADPD4100/ADPD4101. Consult the ADPD4100/ADPD4101 data sheet in conjunction with this user guide when using the EVAL-ADPD4100Z-PPG.

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TABLE OF CONTENTS Features .............................................................................................. 1 Evaluation Kit Contents ................................................................... 1 Additional Equipment Needed ....................................................... 1 Online Resources .............................................................................. 1 General Description ......................................................................... 1 Revision History ............................................................................... 2 Evaluation Board Photographs ....................................................... 3 Getting Started .................................................................................. 4

Install the Wavetool Evaluation Software .................................. 4

Connecting the EVAL-ADPDUCZ to the EVAL-ADPD4100Z-PPG Board .............................................................4 Starting the Wavetool Evaluation Software ...............................5 USB UART Connection ................................................................5 Select the Proper View ..................................................................5 Loading the Device Configuration .............................................6 Starting Real-Time Graphing ......................................................7 Optimizing and Running the ADPD4100 and ADPD4101 ....7

Evaluation Board Schematics and Artwork ...................................8

REVISION HISTORY 6/2020—Revision 0: Initial Version

EVAL-ADPD4100Z-PPG User Guide UG-1795

Rev. 0 | Page 3 of 14

EVALUATION BOARD PHOTOGRAPHS

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Figure 1. EVAL-ADPD4100Z-PPG Top Side

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Figure 2. EVAL-ADPD4100Z-PPG Bottom Side, Optical

UG-1795 EVAL-ADPD4100Z-PPG User Guide

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GETTING STARTED INSTALL THE WAVETOOL EVALUATION SOFTWARE Download the Wavetool Evaluation Software package from the EVAL-ADPD4100Z-PPG product page.

Version 2.1.x or later of the Wavetool Evaluation Software is required to work with this evaluation board. It is recommended to download the latest version from the Wavetool Evaluation Software link at ww.analog.com/EVAL-ADPD4100-4101.

Unzip the downloaded folder, if required, and run the Wavetool Evaluation Software executable file. Some users have found that they must install the tool as the administrative user or run Windows in elevated mode using the elevated command prompt to ensure drivers are properly downloaded during the installation.

Follow the prompts, beginning with the setup window shown in Figure 3 for software installation.

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Figure 3. Wavetool Evaluation Software, Installer Window

A click through licensing window appears during installation of the Wavetool Evaluation Software package. The terms of the license must be read and accepted to install the package.

If the default directory was selected in the installation, for example, C:\Analog Devices\ADI_ApplicationsWaveTool-Rel2.1.5, the executable file is then found in the top level directory (note that the version number may be different) and named Applications Wavetool.exe. Run this file directly, or create and place a shortcut on the desktop.

Note that there is a full help utility included in the Wavetool Evaluation Software, as well as links to videos and other documentation in the Wavetool Evaluation Software library showing how to use the tool (see Figure 4).

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Figure 4. Wavetool Evaluation Software, Getting Help

CONNECTING THE EVAL-ADPDUCZ TO THE EVAL-ADPD4100Z-PPG BOARD Connect the keyed gray ribbon cable between the EVAL-ADPD4100Z-PPG board and the EVAL-ADPDUCZ Cortex-M4 microcontroller motherboard.

Connect the USB cable between the EVAL-ADPDUCZ evaluation motherboard and the PC. Use the USB miniconnector on the short side of the board as shown in Figure 5. After connection, turn the white slider power switch to the on position (see Figure 5). If the switch is already on, toggle the power switch to off, wait 3 sec, then toggle the switch back on again.

When the USB cable is connected from the EVAL-ADPDUCZ back to the PC, the second LED below the power switch illumi-nates, indicating that the on-board battery is being charged from the PC. When the power switch is turned to the on position, the LED immediately below the power switch illuminates, indicating that the EVAL-ADPDUCZ Cortex-M4 microcontroller is also on.

UPGRADE USBMICROCONNECTOR

PORT

RIBBONCABLECONNECTOR(KEYED)

EVAL-ADPDUCZ MOTHERBOARD

POWER-ON SWITCH(OFF IS SHOWN)

EVAL-ADPD4100Z-PPG

USB MINICONNECTORFOR DATAPATH

BOOT MODE(FOR FIRMWARE

UPDATES)RESET

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Figure 5. Connect the EVAL-ADPDUCZ to the EVAL-ADPD4100Z-PPG

EVAL-ADPD4100Z-PPG User Guide UG-1795

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The USB microconnector port on the long side of the board is only used for firmware upgrades for the EVAL-ADPDUCZ board.

Figure 6 shows the stretch wrist strap that is shipped with the EVAL-ADPD4100Z-PPG board.

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Figure 6. Optional Wrist Strap on EVAL-ADPD4100Z-PPG

Figure 7 shows the connectivity of the EVAL-ADPD4100Z-PPG board to the EVAL-ADPDM3Z Cortex-M3 microcontroller motherboard. The EVAL-ADPDM3Z is an alternative microcontroller typically used for demonstration purposes in smaller form factor situations.

EVAL-ADPDM3ZMOTHERBOARD

EVAL-ADPD4100Z-PPGBOARD

STACKINGCONNECTORS

RESET

USBTYPE C

BUTTON AFORCE BLUETOOTHLOW ENERGY MODE

EVAL-ADPDM3Z MOTHERBOARD ANDEVAL-ADPD4100Z-PPG BOARD

MOUNTED TOGETHER

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BOOT MODE(FOR FIRMWARE

UPDATES)

Figure 7. Connecting the EVAL-ADPDM3Z to the EVAL-ADPD4100Z-PPG

STARTING THE WAVETOOL EVALUATION SOFTWARE After the Wavetool Evaluation Software is installed and the EVAL-ADPDUCZ Cortex-M4 microcontroller motherboard and the EVAL-ADPD4100Z-PPG board are connected to the PC, the user can start the Wavetool Evaluation Software.

The executable file is Applications Wavetool.exe, found in the appropriate installation directory as described in the Install the Wavetool Evaluation Software section.

USB UART CONNECTION To establish the software connection between the Wavetool Evaluation Software and the evaluation board firmware, select a connection to the specific UART port used by the EVAL-ADPDUCZ Cortex-M4 microcontroller.

Click the green circular Connect icon (see the red box in Figure 8), and choose the specific COMx port from the Connect list to connect the sensor device on the EVAL-ADPD4100Z-PPG evaluation board and to load the various application modes and sensor selections.

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Figure 8. Connect to the PC COMx Port

For this example, the PC running the Wavetool Evaluation Software is connected via the USB cable to the evaluation setup. Select the proper COMx port found in the dropdown list to connect the Wavetool Evaluation Software to the device.

If connection via Bluetooth® or Bluetooth low energy (BLE) is required, or if there are any other connection issues, refer to the Wavetool Evaluation Software user guide that is provided via the Help icon from within the software package (see Figure 4).

SELECT THE PROPER VIEW After the COMx port connection is established, an electrically erasable programmable read only memory (EEPROM) on the evaluation board is read so that the Wavetool Evaluation Software can determine the type of evaluation board it is communicating to. Look at the status bar of the window in Figure 9.

UG-1795 EVAL-ADPD4100Z-PPG User Guide

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The text states: Connected on USB COM26 to OPL ADPD4100 family (S). (S) indicates SPI connection, whereas (I) indicates an I2C connection.

For a specific evaluation board, various application modes and sensor devices are displayed (see Figure 9).

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Figure 9. Select Sensor to Open ADPD410x Device Window

In the Sensors section, click the ADPD410x sensor to open the window shown in Figure 10 for the EVAL-ADPD4100Z-PPG. If electrocardiography (ECG) leads are connected to this evaluation board, click the ECG icon within the Applications section, which is a specific mode of operation for the EVAL-ADPD4100Z-PPG.

If more information is required about any of the demonstration applications, refer to the Wavetool Evaluation Software user guide provided via the Help icon from within the software package (see Figure 4).

LOADING THE DEVICE CONFIGURATION In the upper left corner of the ADPD410x Device window, click the gear icon (see the red box in Figure 10) to open the ADPD Device window (see the Figure 10 insert).

Load the device configuration file for the ADPD4100 or ADPD4101 device. The Wavetool Evaluation Software provides specific device configurations that may be suitable for the experimental requirements of a user. These device configuration files are *.dcfg extension files.

Select the file by clicking one of two file folder icons in the upper left of the ADPD Device window. The first folder (see the blue box in Figure 10) shows local copies of the device configuration file. The folder in the green box shows consistently updated files found remotely in the cloud.

For this example of PPG measurements, select the configuration file that can be found in both the remote and local folders.

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Figure 10. Connect to the PC COMx Port

EVAL-ADPD4100Z-PPG User Guide UG-1795

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STARTING REAL-TIME GRAPHING When the ADPD4100 or ADPD4101 device is configured, data can be read from the EVAL-ADPD4100Z-PPG. The ADPD4100 and ADPD4101 allow data to be collected in sequential, time division multiplex (TDM). To observe the data, select the appropriately configured time slot.

In this example, the configuration loaded in Figure 10 is ADPD4100.dcfg and configures three separate time slots. SLOT_A uses the three green LEDs, SLOT_B uses the red LED, and SLOT_C uses the IR LED. All the slots are configured to run and use the same photodiode input.

Select two of the time slots to display from the slot selection dropdown menus in the Channels section of the ADPD410x Device window. Figure 10 shows the data for SLOT_A and SLOT_B. After selecting the appropriate slots, click the play button (the small triangular black icon) in the menu bar in the upper left side of the ADPD410x Device window.

Clicking play causes data from the selected slots to be streamed to the PC and displayed. The red and green LEDs on the EVAL-ADPD4100Z-PPG are now lit (the IR LED is also lit, but cannot be seen).

Shown in the graphs of Figure 10 is an example of a PPG signal measured from a finger pressed lightly to the metal disk surface covering the photodiode and the LEDs. A wait of several seconds may be needed for the waveform to stabilize while maintaining a light but constant finger pressure.

It is possible, using the Wavetool Evaluation Software, to save the raw data to a comma separated values (.csv) file that can be read easily in Excel®. Explore the icons in the ADPD410x Device window. Pop up tool tips text provide explanations of icon functions.

OPTIMIZING AND RUNNING THE ADPD4100 AND ADPD4101 After the configuration file is loaded, the settings can be further optimized using the ADPD Device window shown in the insert in Figure 10. Typically, the device is set up under conditions such as measuring the response from a fixed reflector or measuring a PPG signal from the wrist or finger.

Settings can be optimized for any set of conditions by manip-ulating LED drive currents, transimpedance amplifier (TIA) gain, and analog front-end (AFE) timing, or by using different operating modes that may be more optimal for a specific set of measurements, for example, using float mode for a very low current transfer ratio (CTR).

For information on optimization of the ADPD4100 and ADPD4101, refer to the ADPD4100/ADPD4101 data sheet.

For functional descriptions of the Wavetool Evaluation Software, and some of the application demonstration modes, refer to the Wavetool Evaluation Software itself. The Wavetool Evaluation Software provides links to videos and additional software documentation within its help utility (see Figure 4).

UG-1795 EVAL-ADPD4100Z-PPG User Guide

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EVALUATION BOARD SCHEMATICS AND ARTWORK

OPEN INPUTPOTENTIAL REF IN

IMPEDANCE

TO IMPEDANCE INPUTS

R9 NORMALLY 0 OHM

ECG IN

R27 OM PINS 1-2 FOR SPI

R25 OVERLAP WITH JP11 PINS 2-3 FOR I2CR25 OM PINS 1-2 FOR SPI

R27 OVERLAP WITH JP10 PINS 2-3 FOR I2C

OVERLAP DUAL FOOTPRINT

R16 OVERLAP WITH JP2

DEFAULT 1.8V IO

LEDSACCELEROMETER

U3 RED AND IR LED

R19 OVERLAP WITH JP6

ADXL362BCCZ

D2 AND D1 ARE

SHORT WITH 0 OHM FOR NORMAL OPERATION

FOR ONE SPLIT DRIVER POPULATE JP4, JP5 PINS 1-2

PPG PHOTODIODE: POPULATION OF R32 ON JP1ALLOWS DIFFERENTIAL PD ON PIN 2-3OR VC1 DRIVEN PD ON PINS 1-2

SHORT 2-3 WITH R33, R34, 0 OHM FOR NORMAL OPERATION

R19 NORMALLY 0 OHM

R18 NORMALLY 0 OHM

R19 R9 AND R18 SHOW SUGGESTED VALUES FOR CURRENT MEASUREMENT

TP1A AND TP1B ARE FOR BAFFLE PEM NUT HOLES

0

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R31

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IN4IN3

JP1

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R26

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PHOTODIODE

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Figure 11. EVAL-ADPD4100Z-PPG Schematic, Page 1

EVAL-ADPD4100Z-PPG User Guide UG-1795

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VDD

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NN

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AKE1

/P1_

0

DU

T_C

S_N

_AD

XL

VDD

_1.8

V

VDD

_1.8

V

GN

D_L

OC

AL

GN

D_L

OC

ALG

ND

_LO

CAL

VDD

_3V

CO

NN

2_BP

R0_

TON

E_N

/P0_

8

CO

NN

1_W

AKE1

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VDD

_1.8

V

VDD

_1.8

V

7

4

8 56321

2 31

2

6 4 1

3

5

2 31

191715131197531

2018161412108642

161412108642

15131197531

2018161412108642

191715131197531

NC

NC

NC

VSS

SCL

SDA

WC

_NVC

C

BCO

MA

BCO

MA

S1D

VDD

S2

GN

DIN

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23667-012

Figure 12. EVAL-ADPD4100Z-PPG Schematic, Page 2

UG-1795 EVAL-ADPD4100Z-PPG User Guide

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Figure 13. Component: Top Layer and Silkscreen

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Figure 14. Layer 2, Ground

EVAL-ADPD4100Z-PPG User Guide UG-1795

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Figure 15. Layer 3, Power

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Figure 16. Layer 4, Inner Signal

UG-1795 EVAL-ADPD4100Z-PPG User Guide

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Figure 17. Layer 5, Ground

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Figure 18. Bottom Layer, Opticals

EVAL-ADPD4100Z-PPG User Guide UG-1795

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Figure 19. EVAL-ADPD4100Z-PPG Layout, Bottom Layer, Inverted Silkscreen View

UG-1795 EVAL-ADPD4100Z-PPG User Guide

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GPIO

INPU

TS

I2C (1.8V)

EXTERNALLEDS

ECG

IMPEDANCE

SPARE

GROUND POINTS

GROUND CONNECTION FORMETAL BAFFLEPOINTS

DATA CONFIGURATION JUMPERSSPI SELECTED

SEPARATE DRIVES SELECTED

GREEN LED DRIVER CHOICE

3.3V OR 1.8V IO VOLTAGE CHOICE

1.8V SELECTED

PHOTODIODE CONNECT VC1 OR DIFFERENTIALVC1 SHOWN SELECTED

MOUNTING HOLES AND STRAP SLOTS

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0

Figure 20. EVAL-ADPD4100Z-PPG, Jumpers and Connectors

I2C refers to a communications protocol originally developed by Philips Semiconductors (now NXP Semiconductors).

ESD Caution ESD (electrostatic discharge) sensitive device. Charged devices and circuit boards can discharge without detection. Although this product features patented or proprietary protection circuitry, damage may occur on devices subjected to high energy ESD. Therefore, proper ESD precautions should be taken to avoid performance degradation or loss of functionality.

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