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EVAL-ADPD4000Z-PPG User Guide UG-1529
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 ADPD4000/ADPD4001 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 ADPD4000 and ADPD4001 population ADPD4000 (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-ADPD4000Z-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, Cortex-M4 microcontroller motherboard Optional: EVAL-ADPDM3Z, alternative Cortex-M3
microcontroller motherboard (available from the EVAL-ADPD2140Z product page)
ONLINE RESOURCES ADPD4000/ADPD4001 data sheet Wavetool Evaluation Software package
GENERAL DESCRIPTION The EVAL-ADPD4000Z-PPG evaluation board provides users with a simple means of evaluating the ADPD4000/ADPD4001 photometric front end.
The EVAL-ADPD4000Z-PPG evaluation board implements a simple discrete optical design for vital signs monitoring applica-tions, specifically wrist-based photoplethysmography (PPG).
The EVAL-ADPD4000Z-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-ADPD4000Z-PPG product page) allows data stream connections and register configurability to external analysis programs, such as LabVIEW® or MATLAB®, in real time.
The EVAL-ADPD4000Z-PPG board is powered by the EVAL-ADPDUCZ microcontroller board (obtained from the EVAL-ADPD4000Z-PPG product page). In addition to the power requirements, serial port interface (SPI) (default) or I2C data streams are received from the ADPD4000 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-ADPD4000Z-PPG can also be connected directly to the microcontroller development system of the user, using the SPI for the ADPD4000 (or I2C for the ADPD4001).
The ADPD4000/ADPD4001 data sheet, available at www.analog.com, provides full specifications for the ADPD4000/ADPD4001. Consult the ADPD4000/ADPD4001 data sheet in conjunction with this user guide when using the EVAL-ADPD4000Z-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-ADPD4000Z-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 ADPD4000 and ADPD4001 .....7
Evaluation Board Schematics and Artwork ...................................8
REVISION HISTORY 6/2019—Revision 0: Initial Version
EVAL-ADPD4000Z-PPG User Guide UG-1529
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EVALUATION BOARD PHOTOGRAPHS
Figure 1. EVAL-ADPD4000Z-PPG Top Side
Figure 2. EVAL-ADPD4000Z-PPG Bottom Side, Optical
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GETTING STARTED INSTALL THE WAVETOOL EVALUATION SOFTWARE Download the Wavetool Evaluation Software package from the EVAL-ADPD4000Z-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.
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 to ensure drivers are properly downloaded during the installation.
Follow the prompts, beginning with the setup window shown in Figure 3 for software installation.
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).
Figure 4. Wavetool Evaluation Software, Getting Help
CONNECTING THE EVAL-ADPDUCZ TO THE EVAL-ADPD4000Z-PPG BOARD Connect the keyed gray ribbon cable between the EVAL-ADPD4000Z-PPG board and the EVAL-ADPDUCZ Cortex-M4 micro-controller 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.
Figure 5. Connect the EVAL-ADPDUCZ to the EVAL-ADPD4000Z-PPG
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UPGRADE USBMICRO PORT
RIBBONCABLECONNECTOR(KEYED)
M4 MOTHERBOARD
POWER ON SWITCH(OFF IS SHOWN)
EVAL-ADPD4000Z-PPG
USB MINICONNECTORFOR DATA PATH
BOOTMODE(UPGRADE)
RESET
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The USB microconnector 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-ADPD4000Z-PPG board.
Figure 6. Optional Wrist Strap on EVAL-ADPD4000Z-PPG
Figure 7 shows the connectivity of the EVAL-ADPD4000Z-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.
Figure 7. Connecting the EVAL-ADPDM3Z to the EVAL-ADPD4000Z-PPG
STARTING THE WAVETOOL EVALUATION SOFTWARE After the Wavetool Evaluation Software is installed and the EVAL-ADPDUCZ Cortex-M4 microcontroller motherboard and the EVAL-ADPD4000Z-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 Figure 8) and choose the specific COM port from the list.
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 COM 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 COM port connection is established, an EEPROM on the evaluation board is read so that the Wavetool Evaluation Software can determine what type of evaluation board it is communicating to. Look at the bottom line of the window in Figure 9.
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M3MOTHERBOARD
EVAL-ADPD4000Z-PPGEVAL BOARD
STACKINGCONNECTORS
RESET
USBTYPE C
BUTTON BBOOTMODE(UPGRADE)
BUTTON AFORCE BLEMODE
M3 MOTHERBOARD ANDEVAL-ADPD4000Z-PPG EVAL BOARD
MOUNTED TOGETHER
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The text states: Connected on USB COM17 to OPL ADPD4000 family (S). The (S) indicates SPI connection, whereas the (I) indicates an I2C connection.
For a specific evaluation board, various application modes and sensor devices are displayed (see Figure 9).
Figure 9. Select Sensor to Open ADPD Device Window
In the Sensors section, select the ADPD400x sensor to open the window shown in Figure 10 for the EVAL-ADPD4000Z-PPG. If ECG leads are connected to this evaluation board, select the ECG application within the Applications section, which is a specific mode of operation for the EVAL-ADPD4000Z-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.
LOADING THE DEVICE CONFIGURATION In the upper left corner of the ADPD Device window, click the gear icon (see the red box in Figure 10) to open the ADPD Config window (see Figure 10 insert).
Load the device configuration file for the ADPD4000 or ADPD4001 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 from one of two file folder icons in the upper left of the ADPD Config 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.
Figure 10. Connect to the PC COMx Port
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STARTING REAL-TIME GRAPHING When the ADPD4000 or ADPD4001 device is configured, data can be read from the EVAL-ADPD4000Z-PPG. The ADPD4000 and ADPD4001 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 is ADPD4000_ defaultABC_test.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 ADPD 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 ADPD 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-ADPD4000Z-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. Note that a wait of several seconds may be needed for the waveform to stabilize while maintaining a light but consistent finger contact.
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 into Excel®. Explore the icons in the ADPD Device window. Pop up tool tips text provide explanations of icon functions
OPTIMIZING AND RUNNING THE ADPD4000 AND ADPD4001 After the configuration file is loaded, the settings can be further optimized using the ADPD Config window shown in the insert in Figure 10. Typically, the device is set up under conditions, for example, 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 very low current transfer ratio (CTR).
For information on optimization of the ADPD4000 and ADPD4001, refer to the ADPD4000/ADPD4001 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 provides links to videos and additional software documentation within its help utility (see Figure 4).
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EVALUATION BOARD SCHEMATICS AND ARTWORK
Figure 11. EVAL-ADPD4000Z-PPG Schematic, Page 1
PPG PHOTODIODE
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
LEDS
U3 RED AND IR LED
R19 OVERLAP WITH JP6
ADXL362BCCZ
ADPD4000/ADPD4001
D2 AND D1 ARE
SHORT WITH 0 OHM FOR NORMAL OPERATION
FOR ONE SPLIT DRIVER POPULATE JP4, JP5 PINS 1-2
ALLOWS DIFFERENTIAL PD ON PIN 2-3OR VC1 DRIVEN PD ON PINS 1-2
POPULATION OF R32 ON JP1
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
0
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0.5
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VSMD66694
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0.1UF
3PIN_JUMPER_SM
ADXL362BCCZ
3PIN_JUMPER_SM
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0N/A
0
0
0
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ADPD4000
100K
100K
47PF
47PF
47PF25.5K
25.5K
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3PIN_JUMPER_SM
3PIN_JUMPER_SM
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TP1B
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R32
R34R33
R25
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C10
R13
R14
DS3DS2DS1
GND8
GND9
R30
R28
R29
C13
C12
C9
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R6
R31
R22
JP10
JP11 C7
IN4IN3
JP1
U1
R4
R26
GND3
SDA
SCL
R24
R23GND2
VC2
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R16
JP2
GPIO3
GPIO2
LED2BLED1B
LED4AIN8
IN7
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D2
E1
C18
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C17
C16C15
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R19
JP6
C8
R710KR8
GND6
R9
R18
D1
C4 C6
GPIO1
GPIO0
C5
GND1 GND0
U2
CONN1_SPI1_MISO/P1_8
CONN1_SPI1_CLK/P1_6
LEDX1
VBOOST
LEDX1
GND_LOCAL
GND_LOCAL
CONN1_I2C_SDA/P0_5
CONN1_I2C_SCL/P0_4
GND_LOCAL
GND_LOCAL
GND_LOCAL
DUT_IOVD DUT_IOVD
GND_LOCAL
CONN1_I2C_SCL/P0_4
CONN1_I2C_SDA/P0_5
GND_LOCAL
PD_ANODE
PD_COMM
CONN1_WAKE0/P0_15CONN1_SPI1_MOSI/P1_7
CONN1_SPI1_CLK/P1_6
VDD_3V
VDD_1.8V
CONN1_SPI1_MISO/P1_8LEDX4B
GND_LOCAL
GND_LOCAL
DUT_CS_N_ADXL
LEDX3B
VDD_3V
VDD_1.8V
CONN1_WAKE1/P1_0
ACCEL_TRIGGER
CONN1_TMR0_OUT/P0_14
CONN1_WAKE0/P0_15
ACCEL_TRIGGER
LEDX4B
LEDX3LEDX2
LEDX1
LEDX3B
CONN1_SPI1_MOSI/P1_7SPI1_CS1
PD_ANODE
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IN5
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GND_LOCAL
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1
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BCOMA
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BCOMA
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EVAL-ADPD4000Z-PPG User Guide UG-1529
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Figure 12. EVAL-ADPD4000Z-PPG Schematic, Page 2
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P1_
0
VD
D_1
.8V
_LD
O2
CO
NN
1_W
AK
E1/
P1_
0
DU
T_C
S_N
_AD
XL
VD
D_1
.8V
VD
D_1
.8V
GN
D_L
OC
AL
GN
D_L
OC
AL
GN
D_L
OC
AL
VD
D_3
V
CO
NN
2_B
PR
0_TO
NE
_N/P
0_8
CO
NN
1_W
AK
E1/
P1_
0
VD
D_1
.8V
VD
D_1
.8V
7
4
8 56321
2 31
2
6 4 1
3
5
2 31
191715131197531
2018161412108642
161412108642
15131197531
2018161412108642
191715131197531
NC
NC
NC
VS
SS
CL
SD
A
WC
_NV
CC
BCO
MA
BCO
MA
S1
D
VD
D
S2
GN
DIN
BCO
MA
20180-012
UG-1529 EVAL-ADPD4000Z-PPG User Guide
Rev. 0 | Page 10 of 14
Figure 13. Component: Top Layer and Silkscreen
Figure 14. Layer 2, Ground
2018
0-01
320
180-
014
EVAL-ADPD4000Z-PPG User Guide UG-1529
Rev. 0 | Page 11 of 14
Figure 15. Layer 3, Power
Figure 16. Layer 4, Inner Signal
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0-01
520
180-
016
UG-1529 EVAL-ADPD4000Z-PPG User Guide
Rev. 0 | Page 12 of 14
Figure 17. Layer 5, Ground
Figure 18. Bottom Layer, Opticals
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0-01
720
180-
018
EVAL-ADPD4000Z-PPG User Guide UG-1529
Rev. 0 | Page 13 of 14
Figure 19. EVAL-ADPD4000Z-PPG Layout, Bottom Layer, Inverted Silkscreen View
2018
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9
UG-1529 EVAL-ADPD4000Z-PPG User Guide
Rev. 0 | Page 14 of 14
Figure 20. EVAL-ADPD4000Z-PPG, Jumpers and Connectors
I2C refers to a communications protocol originally developed by Philips Semiconductors (now NXP Semiconductors).
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
2018
0-02
0
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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