ANALOG DEVICES EVAL-HCRWATCH4Z Signs Monitoring Watch Instruction Manual
- June 6, 2024
- Analog Devices
Table of Contents
- **FEATURES
- **DEVICES HOSTED IN THE VSM WATCH
- **EVALUATION KIT CONTENTS
- **SOFTWARE NEEDED
- GENERAL DESCRIPTION
- PREPARING THE VSM WATCH
- CONDITIONS REGARDING THE USE OF THIS PRODUCT IN HEALTHCARE APPLICATIONS
- EVALUATION PLATFORM OVERVIEW
- EVALUATION PLATFORM
- DISPLAY INDICATORS
- VITAL SIGNS MONITORED
- MOTION AND ACTIVITY – ADXL362
- ELECTROCARDIOGRAPHY – AD8233
- External ECG Cables
- BIO-IMPEDANCE – AD5940
- SKIN AND AMBIENT TEMPERATURE
- USE CASES
- EMBEDDED ALGORITHMS FOR EVALUATION
- PEDOMETER
- AUTOMATIC GAIN CONTROL
- BATTERY LIFE AND MEMORY FOOTPRINT
- MEMORY FOOTPRINT
- FCC COMPLIANCE STATEMENT
- ORDERING INFORMATION
- Read User Manual Online (PDF format)
- Download This Manual (PDF format)
EVAL-HCRWATCH4Z
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
ADI Confidential
Vital Signs Monitoring (VSM) Watch
**FEATURES
**
The vital signs monitoring platform
Wearable battery-powered platform
Real-time live data view
Data storage to flash memory for offline analyses
Easy configuration
**DEVICES HOSTED IN THE VSM WATCH
**
nRF52840
ADP5360
ADXL362
ADPD4100
AD8233
5940
AD7156
**EVALUATION KIT CONTENTS
**
The VSM Watch
A Charging Cradle
A USB Type-A to micro-USB cable
Firmware Debug Board
**SOFTWARE NEEDED
**
VSM WaveTool
GENERAL DESCRIPTION
The vital sign monitoring (VSM) watch, EVAL-HCRWATCH4Z, is a modular
development, demonstration, and data collection platform for high-performance
vital signs monitoring applications based on Analog Devices, Inc., analog
front ends, and sensors.
It is a wearable, battery-powered device that enables the continuous
monitoring and on-demand spot-check measurement of photoplethysmography (PPG),
electrodermal activity (EDA, bioimpedance-based), skin temperature,
electrocardiography (ECG, biopotential based), and motion/activity (based on a
3-axis accelerometer).
It allows for synchronized, multiparameter data storage on internal memory for later data retrieval and offline analysis and/or live monitoring on a PC (Windows® OS) or Android or iOS-based device. PLEASE SEE THE LAST PAGE FOR AN IMPORTANT WARNING AND LEGAL TERMS AND CONDITIONS.
PREPARING THE VSM WATCH
Before using the VSM watch, proper preparations must be made. Ensure the battery of the watch is charged and the WaveTool program for PC is successfully installed. See the Powering Up the System for the First Time sections for installation instructions. The watch firmware must be upgraded using the VSM WaveTool.
CONDITIONS REGARDING THE USE OF THIS PRODUCT IN HEALTHCARE APPLICATIONS
This device design is being provided as-is without any express or implied
representations or warranties of any kind and the use of this device shall
impose no legal obligation
on Analog Devices, Inc., and its subsidiaries, employees, directors, officers,
servants, and agents. In addition, it is understood and agreed to that the
device is not authorized
for use in safety-critical healthcare applications (such as life support) in
which malfunction or failure of a product can be expected to result in
personal injury or death. This device must not be used for diagnostic
purposes. It must not be used with a defibrillator or other equipment that
produces high voltages in excess of the supply rails on the evaluation board.
This device is provided for evaluation and development purposes only. It is
not intended for use as, or as part of, an end product. Any use of the device
in such applications is at
your own risk and you shall fully indemnify Analog Devices, 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.
REVISION HISTORY
8/2020—Revision 0: Initial Version
ADI Confidential
EVALUATION PLATFORM OVERVIEW
|
---|---
|
EVALUATION PLATFORM
OVERVIEW
The VSM watch is a modular development, demonstration, and data collection
platform for high-performance vital signs monitoring applications based on
Analog Devices analog front ends and sensors.
The platform optimized electrical and mechanical design hosts all the required
circuits to sense, condition, digitize, process, store, and wirelessly
transmit real-time, vital sign
related data. This platform does the following:
-
Minimizes the risks associated with a new electronic design
-
Minimizes the time to market for a new final product
-
Facilitates the evaluation of a wide range of Analog Devices solutions in a single battery-powered wearable ecosystem
-
Highlights and addresses the challenges associated with a wearable device
-
Allows the developer to focus on other added value tasks such as algorithm development and the overall firmware for engineering and scientific research and
validation This platform is not intended to do the following: -
Act as the final product for a specific application
-
Demonstrate an application-specific optimized design. Trade-offs have been made to allow platform flexibility
The evaluation platform kit contains the following items: -
The VSM platform (the watch)
-
Charging Cradle
-
A USB Type-A to micro-USB cable
-
Firmware Debug Board
The USB cable is used for the following purposes:
- Recharge the battery via the charging cradle (connecting the watch to a PC or wall adaptor)
- Upgrade the platform firmware (using the software tools provided and as explained in the Error! Reference source not found. section)
- Download data stored in the internal flash memory for offline data analyses or other purposes Only use the watch with the USB cable provided.
POWERING UP THE SYSTEM FOR THE FIRST TIME
The VSM Watch is shipped from the factory in an ultra-low-power shipment mode.
To exit this power mode, place the watch into the cradle with a connected USB
cable providing power.
Before using the watch for the first time, fully charge the battery by
connecting the VSM watch to a PC or wall adaptor using the USB cable provided.
A firmware upgrade
maybe required. Details can be found in the Error! Reference source not found.
section.
WATER RESISTANCE
The watch is IP68 rated. Despite this rating, please exercise caution if
showering, swimming or doing any other activity with the VSM Watch that
exposes it directly to moisture.
BLUETOOTH USB PC DONGLE (NRF52840)
The VSM Watch platform leverages an off-the-shelf Nordic BLE dongle for
communicating wirelessly with a PC. The nRF52840 is available for purchase
separately through
multiple online vendors. Custom FW for this dongle can be found at
https://www.nordicsemi.com/Software-andtools/Development-
Kits/nRF52840-Dongle
BUTTONS
Two buttons are found on the side of the watch. An explanation of their uses
is found in the tables below.
Table 1. Button Descriptions
Button | Description | |
---|---|---|
Navigation | Press to proceed to the next screen | |
Select | Press for ‘OK’ |
Table 2. Button Usage in Watch App
Button Combination | Button Actions | Button Press Timings (sec) |
---|---|---|
Select button Short press | select current page action | 0.05 |
Navigate button Short press | navigate to next page | 0.05 |
Select button Long press | back to the previous page action | 3 |
Navigate button Long press | call soft reset of the watch app | 3 |
Select + Navigate button Long press | enter Bootloader | 3 |
Navigate button Long press when Watch is powered down | Watch wakes up | 1 |
Table 3. Button Usage in Bootloader
Button Combination | Button Actions | Button Press Timings (sec) |
---|---|---|
Select button Short press | No action | – |
Navigate button Short press | No action | – |
Select button Long press | No action | – |
Navigate button Long press | Enter Watch app | 7 |
Select + Navigate button Long press | Enter Watch app | 7 |
Select button Short press | No action | – |
DISPLAY INDICATORS
SOFTWARE TOOLS
For information on the VSM Watch Software, please refer to the VSM Watch
Software User Guide.
VITAL SIGNS MONITORED
To minimize the power line interference (50 Hz/60 Hz) and improve the quality
of the output signal, it is recommended to use the BLE link.
PHOTOPLETHYSMOGRAPHY (PPG)— ADPD4100
The ADPD4100 operates as a complete multimodal sensor front end, stimulating
up to eight LEDs (four on the VSM Watch) and measuring the return signal on up
to eight
separate current inputs. Twelve-time slots are available, enabling 12 separate
measurements per sampling period. The data output and functional configuration
utilize an I2C
interface on the ADPD4001 or a serial port interface (SPI) on the ADPD4000.
The control circuitry includes flexible LED signaling and synchronous
detection. The devices use a 1.8 V analog core and 1.8 V/3.3 V compatible
digital input/output (I/O).
Refer to the ADPD4100 product page and datasheet for further details.
Details regarding the hardware implementation are found in Table 4 and Table
5.
Table 4. Electrical Connections to the ADPD4100 Inputs
Input Pin | Description |
---|---|
IN-1 | VEMD8080 Photodiode 1 |
IN-2
IN-3
IN-4
IN-5
IN-6
IN-7
IN-8| VEMD8080 Photodiode 2
Temp Sensor
Temp Sensor
ECG / Bio-Z
ECG / Bio-Z
ECG / Bio-Z
ECG / Bio-Z
Table 5. Electrical Connections to the ADPD4100 LED Current Sinks
Current Sink | Color | Wavelength | No. of LEDs |
---|---|---|---|
LED1A | Green | 530 nm | 1 |
LED2A | Infrared | 850 nm | 1 |
LED3A LED4A | Red | ||
Blue | 660 nm |
470 nm
| 1
1
MOTION AND ACTIVITY – ADXL362
Motion is sensed by the ADXL362, an ultra-low-power, 3axis, ±2 g/±4 g/±8 g digital output high resolution (1 mg/LSB) accelerometer. Its power consumption is 1.8 µA at 100 samples per second (SPS) and 3.0 µA at 400 SPS, while its motion-activated wake-up mode only requires 270 nA. A pedometer algorithm is embedded for evaluation that can be enabled in Wave tool.
ELECTROCARDIOGRAPHY – AD8233
The AD8233 is a 50 µA 2.0 mm × 1.7 mm WLCSP low noise single lead analog
output biopotential front end.
Integrated ECG Electrodes
The AD8233 is connected to the electrodes hosted in the top and bottom
surfaces of the watch. The two electrodes on the top of the watch are
connected to IN− pin and RLD pin, while the two electrodes on the bottom of
the watch are shorted together (temporarily while this measurement is active)
and connected to the IN+ input.
The quality of the contact of the bottom electrodes has a dramatic effect on
the output waveform. Dry, hairy skin poses a challenge for this measurement
until moisture accumulates between the skin and the electrodes. This usually
happens a few minutes after the user puts on the device. Accumulated moisture
decreases the contact impedance and, therefore, the quality of the output
waveform improves.
The configuration of this signal chain is similar to an ambulatory ECG device
(Holter monitor). Table 6. Electrical Specifications of the ECG Signal Chain 1
Specification | Value (typ) | Unit |
---|---|---|
Passing Bandwidth | 0.4 to 42 | Hz |
High-Pass Filter | First Order | N/A |
Low-Pass Filter | Second-order (quality factor |
= 0.671)
| N/A
AD8233 Gain|
151| V/V
ADC Resolution| 16| bits
Noise RTI| TBD| µV p-p
Sampling Rate| 50 to 1000| SPS
1 N/A means not applicable.
External ECG Cables
The charging cradle provides a secondary micro-USB connection to be used with external wired electrodes.
BIO-IMPEDANCE – AD5940
Impedance is measured using the AD5940 Impedance AFE.
Proper electrical contact between these two electrodes and the skin is
critical for accurate and reliable long-term measurement. Adequate tightness
of the watch strap helps
achieve proper contact and wearing the watch beside (but not on top of) the
ulnar styloid process (the protruding wrist bone) also helps ensure a reliable
and high-quality
measurement.
Note that these two electrodes are also used by the ECG measurement, which
temporarily shorts them together.
Therefore, the impedance measurement is not valid while the ECG measurement is
ongoing.
Table 7. Electrical Specifications of the AD5940
Specification | Value (Typ) | Unit |
---|---|---|
Conductivity Range | 0.2 to 20 | µS (3%) |
Accuracy at 0.2 µs | 3 | % |
Accuracy at 1 µs | 0.8 | % |
Accuracy at 10 µs | 0.1 | % |
Accuracy at 20 µs | 3 | % |
Resolution at 1 µs | 1 | nS |
Resolution at 10 µs | 2 | nS |
Excitation Frequency | 100 | Hz |
Sampling Rate | 30 | SPS |
SKIN AND AMBIENT TEMPERATURE
The skin temperature measurement is based on a thermistor (NTCG104EF104FTDSX).
The thermistor used in the skin temperature measurement is thermally coupled
to
the bottom of the watch. This thermistor is connected to one of the analog
inputs of the ADPD4100 and its performance is heavily dependent on the
mechanical connection that is made to the body.
Table 8. Electrical Specifications of the Signal Chain That Measures Skin
Temperature
Specification | Value (Typ) |
---|---|
Temperature Range | −30°C to +50°C |
Resolution at 25°C | TBD |
USE CASES
Basic modes of operation have been designed for the VSM Watch that are selectable by supplied Device Configuration Files:
- High-Performance PPG
- Synchronized PGG with EDA
- Synchronized PPG with ECG spot-check
- High-Performance ECG spot-check
- Multi-wavelength PPG
- Future Use Cases will continue to be developed
These modes of operation are intended to demonstrate the different types of configurations that are possible with the VSM Watch but are not specific to an end application. The high configurability of the VSM Watch allows for the possibility to program a configuration that cannot be supported by the existing hardware, software, and firmware. Users can load these Use Cases as a known-good starting to point to explore measurements of interest before modifying the platform for their specific purpose. Please refer to the Software User Guide for details on how to evaluate and modify these Use Cases in Wave tool.
Table 9. Use Case Table
Use Case | PPG | Motion | Impedance | ECG | Temp. |
---|---|---|---|---|---|
Shipment Mode | Off | Off | Off | Off | Off |
Hibernate | Off | Off | Off | Off | Off |
PPG – High Performance (1 LED) | 500 SPS | 50 SPS | 1 SPS | ||
ECG – High Performance | 50 SPS | 50 SPS | 1000 SPS | 1 SPS | |
PPG + Impedance (1 LED) | 100 SPS | 50 SPS | 30 SPS | 1 SPS | |
PPG + ECG (1 LED) | 100 SPS | 50 SPS | 250 SPS | 1 SPS | |
PPG – All LEDs | 100 SPS | 50 SPS | 1 SPS |
All Use Cases are designed to allow for automatic logging to the onboard NAND Flash when the watch detects that it is being worn based on its capacitive sensor.
Use Case| Sampling Rate| TIA Gain CH1/CH| Pulse width|
Slot/Wavelength| Number of Pulses
---|---|---|---|---|---
PPG – High Performance (1 LED)| 500 SPS| 50/50| 2| F/530| 64
ECG – High Performance| 50 SPS| 50/50| 2| F/530| 64
PPG + Impedance (1 LED)| 100 SPS| 50/50| 2| F/530| 64
PPG + ECG (1 LED)| 100 SPS| 50/50| 2| F/530| 64
PPG – All LEDs| 100 SPS| 50/50| 2| F/530, G/, H/, I/| 64
Default ADPD Configuration for each use case:
Use Case | Sampling Rate | Measurement Range |
---|---|---|
PPG – High Performance (1 LED) | 50 SPS | 4g |
ECG – High Performance | 50 SPS | 4g |
PPG + Impedance (1 LED) | 50 SPS | 4g |
PPG + ECG (1 LED) | 50 SPS | 4g |
PPG – All LEDs | 50 SPS | 4g |
Default AD5940 Configuration for each usecase:
Use Case | Sampling Rate | TIA Gain |
---|---|---|
PPG – High Performance (1 LED) | NA | |
ECG – High Performance | 1000 SPS | |
PPG + Impedance (1 LED) | 30 SPS | |
PPG + ECG (1 LED) | 250 SPS | |
PPG – All LEDs | NA |
Default AD8233 Configuration for each use case:
Use Case | AC/DC coupling | FR mode | Gain |
---|---|---|---|
PPG – High Performance (1 LED) | NA | NA | NA |
ECG – High Performance | DC Coupling | On | 150k |
PPG + Impedance (1 LED) | NA | NA | NA |
PPG + ECG (1 LED) | DC Coupling | On | 150K |
PPG – All LEDs | NA | NA | NA |
EMBEDDED ALGORITHMS FOR EVALUATION
Basic algorithms are included with the VSM Watch to demonstrate this type of functionality. More advanced algorithms with specific device configurations are provided here.
PEDOMETER
A pedometer algorithm takes raw data from the 3-axis accelerometer and outputs the steps taken.
AUTOMATIC GAIN CONTROL
The digitized output of the ADPD4100 is fed to this algorithm to ensure that the LED current and AFE gain is configured appropriately to maximize the usefulness of the Optical Signal. The default target is 70% of the allowable range for each LED (independently determined). This Gain Control is not optimized to achieve an ideal performance versus power. Further improvements can be made based on the end application’s requirements to achieve a better battery life
BATTERY LIFE AND MEMORY FOOTPRINT
BATTERY LIFE
The battery life is determined by the type and number of sensors enabled, the
sampling rate configured and is also dependent on other configuration details
such as the LED
current in the photoplethysmography measurements.
Table 10. System Battery Life for Several Use Cases
Use Case | Memory | Live BLE | Battery Life (Hours) |
---|---|---|---|
Shipment Mode | No | No | 30000+ |
Hibernate | No | No | 1000+ |
PPG – High Performance | Yes | Yes | 14 |
ECG – High Performance | Yes | Yes | 40 |
PPG +
Impedance
| Yes| Yes| 50
PPG + ECG| Yes| Yes| 40
PPG – All LEDs| Yes| Yes| 20
The VSM watch is powered by a rechargeable 200 mAh battery.
MEMORY FOOTPRINT
The watch hosts a 512 MB memory.
The actual capacity of the memory is determined by the type and number of
sensors enabled and the sampling rate configured.
Table 11. Memory Capacity (in Hours) for Different Use Cases
Vital Signs | Memory Capacity (Hours) |
---|---|
PPG – High Performance | 18 |
ECG – High Performance | 22 |
PPG + Impedance | 63 |
PPG + ECG | 43 |
PPG – All LEDs | 23 |
Note : All the default use cases are designed to maximize performance. By
modifying various parameters of the AFEs, one can achieve longer battery life
and memory usage.
For instance, in ADPD4100 the default gain in the AGC algorithm is set to 25K
so as to get the best PPG performance with various skin tones. Setting the
gain to 100k/200k and lowering the current value will result in significant
improvement in battery life.
FCC COMPLIANCE STATEMENT
This device complies with Part 15 of the FCC Rules. Operation is subject to
the following two conditions:
(1) this device may not cause harmful interference, and
(2) this device must accept any interference received, including interference
that may cause undesired operation.
Changes or modifications not expressly approved by the party responsible for
compliance could void the user’s authority to operate the equipment.
This equipment has been tested and found to comply with the limits for a Class
B digital device, pursuant to Part 15 of the FCC Rules. These limits are
designed to provide reasonable protection against harmful interference in a
residential installation. This equipment generates, uses and can radiate radio
frequency energy and, if not installed and used in accordance with the
instructions, may cause harmful interference to radio communications. However,
there is no guarantee that interference will not occur in a particular
installation. If this equipment does cause harmful interference to radio or
television reception, which can be determined by turning the equipment off and
on, the user is encouraged to try to correct the interference by one or more
of the following measures:
— Reorient or relocate the receiving antenna.
— Increase the separation between the equipment and receiver.
— Connect the equipment into an outlet on a circuit different from that to
which the receiver is connected.
— Consult the dealer or an experienced radio/TV technician for help.
CAUTION
–Risk of explosion if the battery is replaced by an incorrect type.
–Disposal of a battery into fire or a hot oven, or mechanically crushing or
cutting of a battery, that can result in an explosion;
–Leaving a battery in an extremely high temperature surrounding environment
can result in an explosion or the leakage of flammable liquid or gas;
— A battery subjected to the extremely low air pressure may result in an
explosion or the leakage of flammable liquid or gas.
ORDERING INFORMATION
DEVICE MODELS
Table 12. Device Models
Model | Description |
---|---|
EVAL-HCRWATCH4Z | VSM Watch. Multiple VSMs (wearable battery-powered wireless |
system)
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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UG16392-0-4/18(Sp0)
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