Silicon Laboratories Biometric-EXP EVB Manual de usuario

Biometric-EXP EVB

BIOMETRIC-EXP Evaluation Board USER’SGUIDE

1. Introduction

The Silicon Labs’ Biometric-EXP Evaluation Board is a hardware plugin card for EFM32™ Starter Kits (STK’s). The

Biometric-EXP is intended to demonstrate and evaluate the biometric applications of Silicon Labs Si7013 Humidity

and Temperature Sensor and the Si1146 Proximity/UV/Ambient Light Sensor which is capable of monitoring pulse

rate and oxygen saturation (SpO2). A Biometric-EXP Software Demo is available to download to an EFM32

Wonder Gecko STK through Simplicity Studio. The software is capable of displaying humidity, temperature, UV,

pulse rate, and SpO2 readings on the Wonder Gecko STK display. In addition to the Silicon Labs sensors, it is also

notable that the Biometric-EXP EVB contains a Silicon Labs’ TS3310 Boost DC-DC Converter.

Figure 1. EFM32 Wonder Gecko STK (Left) Connected to a Biometric-EXP (Right)

1.1. Key Features

Si7013 Humidity and Temperature Sensor

Si1146 Proximity/UV/Ambient Light Sensor capable of monitoring Pulse Rate and SpO2

6-pin ribbon cable connector for attaching a postage stamp board

20-pin expansion header

Battery operated with low power optimizations for long battery life

Demonstration software source code available

USB debug mode allowing HRM and SpO2 samples to be transferred to a PC

Windows GUI to visualize pulse signals and to record samples from USB debug mode

Easy use through Simplicity Studio

1.2. Getting Started

The first step to getting started with your new Biometric-EXP-EVB is to download Simplicity Studio from

www.silabs.com/simplicity-studio.

The simplicity studio software package contains all the tools, drivers, software examples, and documentation

needed to use the Biometric-EXP-EVB.

You will need to connect the Biometric-EXP-EVB to the EFM32WG-STK3800 Wonder Gecko STK or the

EFM32GG-STK3700 Giant Gecko STK. The demo code can be loaded using the USB cable and the J-Link debug

interface.

Biometric-EXP EVB

2 Rev. 0.4

2. Loading the Demo Onto the Gecko Starter Kit

The following steps will load the demo firmware onto the Gecko STK. This process requires Simplicity Studio which

is available for download at www.silabs.com/simplicity-studio.

1. Use a USB mini type cable to connect the J-Link debug interface on the Gecko STK to the PC and set the

3-position Power Source Select switch to DBG (right-most position).

2. Launch Simplicity Studio.

Figure 2. Simplicity Studio

3. Click on Refresh Detected Hardware.

4. Select the Gecko STK device, under Detected Hardware.

5. Click on the Demos button on the top right of Simplicity Studio.

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Rev. 0.4 3

6. Select the Biometric-EXP demo from the list and click Start.

Figure 3. Demo Selection Dialog

Biometric-EXP EVB

4 Rev. 0.4

3. Running the Demo

A Silicon Labs EFM32 Wonder Gecko Starter Kit (EFM32WG-STK3800) and a Silicon Labs Biometric-EXP (see

Figure 1) is needed to run the Biometric EXP Demo.

The Biometric-EXP demo application uses the Wonder-Gecko STK’s LCD to display sensor output and the two

push buttons, PB0 and PB1, to cycle through the modes of the demo. The full operation including startup is

illustrated in Figures 4 and 5.

3.1. Demo Startup

Upon reset, the demo will first check whether PB0 is pressed then store the result. It will then search for a

supported device on the 6-pin ribbon cable connector. If a Si1143-M01-PS or Si1147-M01-PS is detected, the

demo will automatically use that device for HRM measurements. In this case, the Si1146 sensor onboard the

Biometric-EXP will not be utilized. SpO2 is not available with the Si114x-M01-PS EVB's. If a HRM-GGG-PS EVB is

detected, the demo will display ‘Error’. The Biometric-EXP demo does not support wrist-based heart rate

monitoring. Please contact Silicon Labs to inquire about our wrist-based heart rate monitor solutions.

Following the search for a ribbon cable device, the demo will check the stored value of PB0 to enable or disable the

USB debug mode accordingly and display an USB On or USB Off message for one second. Refer to Section “4.

USB Debug Mode” for details on USB debug mode. Lastly, the demo will display version information then start the

demo in Heart Rate Monitor mode.

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Rev. 0.4 5

Figure 4. Biometric-EXP Demo Startup Sequence Flash Programmer Dialog

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Biometric-EXP EVB

6 Rev. 0.4

Figure 5. Biometric-EXP Demo Modes

*Note: SpO2 Monitor mode is not available when using Si1143-M01-PS or Si1147-M01-PS.

3.2. Heart Rate Monitor Mode

When heart rate monitor demo is idle, the LCD will show the word “Pulse” followed by a message instructing the

user to place his/her finger on the optical sensor. In idle mode, the sensor is not continuously sampling. Rather, it

executes one sample every two seconds by performing a forced measurement. That sample is then analyzed to

determine if there is skin contact with the sensor. Only when the application detects skin contact does it begin

sampling continuously and running the HRM algorithm. It will remain in run mode (continuous sampling) until skin

contact is removed for greater than two seconds. This approach significantly reduces power usage when idle.

When the application is acquiring the heart rate, it will display the word “Wait” on the LCD. It typically takes five to

seven seconds to acquire a valid heart rate. Once a valid heart rate is measured, the display will show the heart

rate. If the heart rate is not displayed within seven seconds, it is likely that the algorithm cannot get a valid pulse

rate. When this occurs, the user should remove his/her finger and try it again adjusting the position of the finger

and the finger pressure as needed.

Proper finger position in relation to the sensor and LEDs as well as proper finger pressure is essential for accurate

measurements. The finger should fully cover both LEDs and the sensor. As illustrated in Figure 6, the finger should

be lightly placed on the sensor. Too much pressure will restrict blood flow in the finger and, therefore, not allow the

sensor to measure a heart rate.

Figure 6. Proper Finger Placement

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Biometric-EXP EVB

Rev. 0.4 7

3.3. SpO2 Monitor Mode

When SpO2 mode is active, the LCD will show “SpO2” followed by a message instructing the user to place his/her

finger on the optical sensor. Beyond that, SpO2 monitor mode mirrors the operation of the Heart Rate Monitor

mode as described in Section “3.2. Heart Rate Monitor Mode” . Please note that SpO2 mode is not available when

using Si1143-M01-PS or Si1147-M01-PS devices via the 6-pin ribbon cable. Even more so than HRM, proper

finger position and pressure is important to achieve a good SpO2 measurement. Refer to Figure 6 for an illustration

of proper finger position.

3.4. Ultraviolet Sensor Mode

When the UV sensor mode is active, the LCD will show “UV” followed by the measured UV index. In this mode, the

UV reading is updated every two seconds.

3.5. Temperature Sensor Mode

In the temperature sensor modes, the LCD will show the temperature in Fahrenheit or Celsius as indicated by an

“F” or a “C” following the reading. In this mode the temperature reading is updated every two seconds.

3.6. Relative Humidity Sensor Mode

In the relative humidity sensor mode, the LCD will show “RH” followed by the relative humidity reading. In this

modem, the relative humidity reading is updated every two seconds.

Biometric-EXP EVB

8 Rev. 0.4

4. USB Debug Mode

The Biometric-EXP demo firmware includes a debug mode that enables Heart Rate Monitor and SpO2 raw

samples from the sensor to be streamed to a host PC via the Gecko STK’s USB interface. Only HRM and SpO2

data is available via the USB debug interface. UV, Relative Humidity, and Temperature data is not available.

Enabling and connecting to USB debug mode is illustrated in Figure 7 and is described in the following sections.

Figure 7. Enabling and Connecting to USB Debug Mode

4.1. Enabling USB Debug Mode

In order to maintain power efficiency of the demo, the USB debug mode is disabled by default. The LCD will show

“USB OFF” during startup. To enable USB debug mode, the user must hold down button PB0 then press and

release the Reset button. Both buttons are on the Gecko STK as shown in Figure 7. The user should hold down

PB0 until the LCD shows “USB ON.” At this point, USB is enabled and the demo will run normally. To later disable

USB debug mode the user can press the Reset button without holding PB0.

4.2. Connecting to USB Debug Mode on a PC

Prior to using USB debug mode, the user must first install the Biometric-EXP Windows Evaluation Software. This

will install the Windows applications and drivers necessary to use USB debug mode. The Gecko STK has two USB

type connectors: a USB Mini type connector labeled J-Link on the short side of the EVB and a USB Micro type

connector on the long side of the EVB. The USB Micro connector is used for the USB debug interface, as shown in

Figure 7. In addition to using the correct physical interface, the Power Source Select switch must be set to USB

(center position) for proper operation.

USB debug mode utilizes a Virtual COM Port (VCP) interface to communicate between the Biometric-EXP demo

and the PC. With the Windows software installed, USB debug mode enabled on the Wonder Gecko and a USB

cable connecting the Wonder Gecko STK and the PC, the device will appear in Windows Device Manager as a

COM port as shown in Figure 8.

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The J-Link USB mini connector is not used for

the Biometric-EXP demo debug interface. It is

only used to load firmware and for firmware

development

The USB micro connector is used as the

Biometric-EXP demo debug interface.

The Power Source Select Switch should

be set to USB to enable the debug

interface

To enable USB Debug Mode, hold down

PB0 and press Reset. Continue holding

PB0 until the display shows USB ON

Biometric-EXP EVB

Rev. 0.4 9

Figure 8. Biometric-EXP Virtual COM Port Device in Windows Device Manager

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Biometric-EXP EVB

10 Rev. 0.4

4.3. Windows Applications for USB Debug Mode

The Biometric-EXP Windows Evaluation Software includes two Windows applications for evaluating and

debugging the Biometric-EXP Heart Rate Monitor and SpO2 functions. An installation program for the Biometric-

EXP Windows Evaluation Software is distributed with Simplicity Studio. It can be found in the Installers directory

within the Simplicity Studio directory structure. Following installation, the software can be launched from the

Windows Start menu.

The Windows Graphical User Interface (GUI) demo provides a waveform display of the HRM data along with the

HRM and SpO2 calculated values. The GUI demo also allows the user to record the streaming data to a file for

further analysis. A screenshot of the GUI demo is shown in Figure 9.

Figure 9. Windows Graphical User Interface Demo

The Windows Console Demo provides a running, once-per-second text output of many parameters that are used

within the HRM and SpO2 algorithms including the HRM and SpO2 results. This tool can be used for advanced

analysis of the HRM and SpO2 streaming data; however, the details of the parameters and how to use them to

analyze a HRM-SpO2 recording is beyond the scope of this document. A screen shot of the Console demo is show

in Figure 10.

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