Texas Instruments AFE4403 User manual

User's Guide
SLAU572B–June 2014–Revised July 2014
AFE4403 Development Guide
This user’s guide describes the characteristics, operation and use of the AFE4403EVM demonstration kit.
This demonstration kit is an evaluation module for the AFE4403 device. The family of devices are fully-
integrated AFE, ideally suited for Pulse Oximeter applications. The EVM is intended for prototyping and
evaluation. This user’s guide includes a complete circuit description, schematic diagram and bill of
materials.
The following related documents are available through the Texas Instruments web site at www.ti.com:
Device Literature Number
AFE4403 SBAS650
Contents
1 AFE4403EVM Overview .................................................................................................... 4
1.1 Important Disclaimer Information ................................................................................. 4
2 Overview...................................................................................................................... 5
2.1 Introduction .......................................................................................................... 5
2.2 AFE4403EVM Kit Contents........................................................................................ 5
2.3 Features Supported in this Version .............................................................................. 5
3 Software Installation......................................................................................................... 7
3.1 Minimum Requirements............................................................................................ 7
3.2 Installing the Software (PC Application) ......................................................................... 7
3.3 Installing the USB Drivers........................................................................................ 10
4 Running the Software...................................................................................................... 19
4.1 Overview of the Features ........................................................................................ 19
5 AFE4403EVM Hardware .................................................................................................. 29
5.1 Power Supply...................................................................................................... 30
5.2 Clock................................................................................................................ 30
5.3 Accessing AFE4403 Digital Signals ............................................................................ 30
5.4 USB Interface...................................................................................................... 30
5.5 On-Board Key Interface .......................................................................................... 31
5.6 Visual Indication................................................................................................... 31
6 USB-Based Firmware Upgrade .......................................................................................... 31
7 AFE4403EVM Firmware Upgrade Without GUI........................................................................ 33
8 Connector Interface........................................................................................................ 35
8.1 DB9 Pulse Oximeter Connector................................................................................. 35
8.2 Micro-USB Connector ............................................................................................ 36
8.3 8-Pin Connector ................................................................................................... 37
9 AFE4403EVM Reflective Sensing Quick Start Guide ................................................................. 37
10 AFE4403EVM FAQs....................................................................................................... 41
10.1 EVM communicating with the PC application.................................................................. 41
10.2 ADC_RDY signal.................................................................................................. 41
10.3 Check TXP and TXN Waveforms ............................................................................... 42
10.4 Diagnostics......................................................................................................... 43
10.5 Automation of Register Read and Write Operations.......................................................... 43
10.6 Optimum Viewing Experience on Windows 7 OS............................................................. 43
10.7 Windows 8 Support for Device GUIs ........................................................................... 44
10.8 COM Port........................................................................................................... 50
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11 Bill of Materials ............................................................................................................. 51
12 PCB Layouts and Schematics............................................................................................ 55
12.1 AFE4403EVM PCB Layouts..................................................................................... 55
12.2 SFH7050 Sensor Board Layouts................................................................................ 60
12.3 NJL5310R Sensor Board Layouts .............................................................................. 62
12.4 Schematics......................................................................................................... 64
12.5 NJL5310R Sensor Board Schematic .......................................................................... 68
List of Figures
1 AFE4403 Demonstration Kit................................................................................................ 5
2 PC Application Installation - Screen 1 .................................................................................... 7
3 PC Application Installation - Screen 2 .................................................................................... 8
4 PC Application Installation - Screen 3 .................................................................................... 8
5 PC Application Installation - Screen 4 .................................................................................... 9
6 PC Application Installation - Screen 5 .................................................................................... 9
7 Python Installation.......................................................................................................... 10
8 USB Driver Installation - Screen 1 (Windows 7 OS only)............................................................. 10
9 USB Driver Installation - Screen 2 ....................................................................................... 11
10 USB Driver Installation - Screen 3 ....................................................................................... 12
11 Windows Publisher Verification Warning................................................................................ 13
12 USB Driver Installation - Screen 4 ....................................................................................... 13
13 Device Manager Screen................................................................................................... 14
14 Windows 8 Installing Unsigned Drivers - Screen 1 .................................................................... 15
15 Windows 8 Installing Unsigned Drivers - Screen 2 .................................................................... 16
16 Windows 8 Installing Unsigned Drivers - Screen 3 .................................................................... 16
17 Windows 8 Installing Unsigned Drivers - Screen 4 .................................................................... 17
18 Windows 8 Installing Unsigned Drivers - Screen 5 .................................................................... 17
19 Windows 8 Installing Unsigned Drivers - Screen 6 .................................................................... 18
20 Windows 8 Installing Unsigned Drivers - Screen 7 .................................................................... 18
21 AFE4403EVM Not Connected Error Message ......................................................................... 19
22 Product Safety Warnings, Restrictions and Disclaimers .............................................................. 20
23 AFE4403: Device Configuration: Global Settings...................................................................... 21
24 AFE4403: Device Configuration: Tx Stage ............................................................................. 22
25 AFE4403: Device Configuration: Rx Stage ............................................................................. 23
26 AFE4403: Device Configuration: Timing Controls ..................................................................... 24
27 Device Configuration: Low Level Configuration........................................................................ 25
28 ADC Capture and Analysis Tab.......................................................................................... 27
29 Scope Analysis: Test Results............................................................................................. 27
30 Save Tab .................................................................................................................... 28
31 AFE4403EVM Block Diagram ............................................................................................ 29
32 PC Application Firmware Upgrade – 1 .................................................................................. 31
33 PC Application Firmware Upgrade – 2 .................................................................................. 32
34 PC Application Firmware Upgrade – 3 .................................................................................. 32
35 PC Application Firmware Upgrade – 4 .................................................................................. 33
36 Firmware Loader Application: Select Firmware ........................................................................ 33
37 Firmware Loader Application: Found Device........................................................................... 34
38 Firmware Loader Application: Programming Status ................................................................... 34
39 DB9 Pulse Oximeter Connector Pin Outs............................................................................... 35
40 USB Micro Connector Pin Outs .......................................................................................... 36
41 8-Pin Connector ............................................................................................................ 37
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42 NJRC NJL5310R Sensor Board LED Connections.................................................................... 38
43 OSRAM SFH7050 Sensor Board LED Connections .................................................................. 38
44 Sensor Board Cable Connections........................................................................................ 39
45 Setup for Obtaining Measurements from the Wrist.................................................................... 39
46 Sample Waveform of Green LED Captured on the Wrist with OSRAM SFH7050 ................................ 40
47 ADC_RDY Waveform at 500-Hz PRF................................................................................... 41
48 TXP and TXN Without Pulse Oximeter Cable.......................................................................... 42
49 TXP and TXN After Connecting the Pulse Oximeter Cable .......................................................... 42
50 Diagnostic Feature Fault Flags with No Sensor Connected to the EVM............................................ 43
51 Setting Font Size on Windows 7 Operating System................................................................... 44
52 Broken Arrow Error......................................................................................................... 44
53 Method 1 (Screen 1)....................................................................................................... 45
54 Method 1 (Screen 2)....................................................................................................... 46
55 Method 1 (Screen 3)....................................................................................................... 46
56 Method 1 (Screen 4)....................................................................................................... 47
57 Method 1 (Screen 5)....................................................................................................... 47
58 Method 1 (Screen 6)....................................................................................................... 48
59 Method 2 (Screen 1)....................................................................................................... 48
60 Method 2 (Screen 2)....................................................................................................... 49
61 Method 2 (Screen 3)....................................................................................................... 49
62 Method 2 (Screen 4)....................................................................................................... 50
63 AFE4403EVM Top Overlay ............................................................................................... 55
64 Top Solder .................................................................................................................. 55
65 Top Copper (Layer 1) ..................................................................................................... 56
66 GND (Layer 2) .............................................................................................................. 56
67 Signal 1 and GND (Layer 3) ............................................................................................. 57
68 Signal 2 and GND (Layer 4) .............................................................................................. 57
69 Power Plane (Layer 5)..................................................................................................... 58
70 Bottom Copper (Layer 6).................................................................................................. 58
71 Bottom Solder............................................................................................................... 59
72 Bottom Overlay ............................................................................................................. 59
73 SFH7050 Sensor Board Top Silk Screen............................................................................... 60
74 SFH7050 Sensor Board Top Solder Mask.............................................................................. 60
75 SFH7050 Sensor Board Top Copper.................................................................................... 60
76 SFH7050 Sensor Board Bottom Copper................................................................................ 60
77 SFH7050 Sensor Board Bottom Solder Mask.......................................................................... 61
78 SFH7050 Sensor Board Bottom Silk Screen ........................................................................... 61
79 NJL5310R Sensor Board Top Silk Screen.............................................................................. 62
80 NJL5310R Sensor Board Top Solder Mask ............................................................................ 62
81 NJL5310R Sensor Board Top Copper................................................................................... 62
82 NJL5310R Sensor Board Bottom Copper............................................................................... 62
83 NJL5310R Sensor Board Bottom Solder Mask ........................................................................ 63
84 NJL5310R Sensor Board Bottom Silk Screen.......................................................................... 63
85 AFE4403EVM Schematics (1 of 4) ...................................................................................... 64
86 AFE4403EVM Schematics (2 of 4) ...................................................................................... 65
87 AFE4403EVM Schematics (3 of 4) ...................................................................................... 66
88 AFE4403EVM Schematics (4 of 4) ...................................................................................... 67
89 SFH7050 Sensor Board Schematic ..................................................................................... 68
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90 NJL5310R Sensor Board Schematic .................................................................................... 68
List of Tables
1 Save Tab Control Descriptions........................................................................................... 28
2 Test Points for Measuring Voltages on the AFE4403SPO2EVM.................................................... 30
3 AFE4403 Digital Signals................................................................................................... 30
4 AFE4403EVM Switches................................................................................................... 31
5 DB9-based Pulse Oximeter Connector Pin Out Descriptions ........................................................ 36
6 USB Micro Connector Pin Out Descriptions............................................................................ 36
7 8-Pin Connector Pin Descriptions........................................................................................ 37
8 Troubleshoot and Links.................................................................................................... 50
9 AFE4403EVM Bill of Materials ........................................................................................... 51
10 OSRAM SFH7050 Sensor Board Bill of Materials ..................................................................... 54
11 NJRC NJL5310R Sensor Board Bill of Materials ...................................................................... 54
1 AFE4403EVM Overview
1.1 Important Disclaimer Information
CAUTION
The AFE4403EVM is intended for feasibility and evaluation testing only in
laboratory and development environments. This product is not for diagnostic
use. This product is not for use with a defibrillator.
Only use the AFE4403EVM under the following conditions:
• The AFE4403EVM demonstration kit is intended only for electrical evaluation of the features of the
AFE4403 devices in a laboratory, simulation, or development environment.
• The AFE4403EVM demonstration kit is not intended for direct interface with a patient, or patient
diagnostics.
• The AFE4403EVM demonstration kit is intended for development purposes ONLY. It is not intended to
be used as all or part of an end-equipment application.
• The AFE4403EVM demonstration kit should be used only by qualified engineers and technicians who
are familiar with the risks associated with handling electrical and mechanical components, systems,
and subsystems.
• The user is responsible for the safety of themselves, fellow employees and contractors, and co-
workers when using or handling the AFE4403EVM. Furthermore, the user is fully responsible for the
contact interface between the human body and electronics; consequently, the user is responsible for
preventing electrical hazards such as shock, electrostatic discharge, and electrical overstress of
electric circuit components.
Pentium, Celeron are registered trademarks of Intel Corporation.
Microsoft, Windows are registered trademarks of Microsoft Corporation.
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2 Overview
2.1 Introduction
The EVM is intended for evaluating AFE4403 device. The family of devices consist of a low-noise receive
channel, the LED transmit section, and diagnostics for sensor and LED fault detection. The AFE4403 has
a highly configurable timing controller, enabling complete control of the device’s timing characteristics. The
device also has an integrated oscillator working off from two clock sources: either an external crystal or
the clock from an external host processor to ease clocking requirements and provide a low-jitter clock to
the AFE4403 The device communicates to an external host processor using the Serial Peripheral Interface
(SPI). The purpose of the EVM is to expedite evaluation and system development activities related to
AFE4403 devices. The demonstration kit is shown in Figure 1.
Figure 1. AFE4403 Demonstration Kit
Throughout the document, the term demonstration kit is synonymous with AFE4403EVM.
2.2 AFE4403EVM Kit Contents
• AFE4403EVM Demonstration Kit
• USB-to-micro USB cable
• DB9 to 8 pin header sensor cable
• NJRC NJL5310R sensor board
• OSRAM SFH7050 sensor board
2.3 Features Supported in this Version
1. DB9 pulse oximeter sensor cable support
2. Acquire data at up to 3000 Hz in evaluation mode
3. USB-based power and PC application connectivity
4. Access to all AFE4403 registers via an easy-to-use GUI
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5. Built-in time domain, histogram, and FFT on the PC application
6. USB-based firmware upgrade option
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3 Software Installation
The latest AFE4403EVM PC application software (GUI) is available from the TI website at www.ti.com.
Download the zipped file to a temporary directory on the PC.
3.1 Minimum Requirements
Before installing the software, verify that your PC meets the minimum requirements outlined in this
section.
3.1.1 Required Setup for AFE4403EVM Demo Software
• IBM PC-compatible computer
• Pentium®III/ Celeron®866 MHz or equivalent processor
• Minimum 256MB of RAM (512MB or greater recommended)
• Hard disk drive with at least 200 MB free space
• Microsoft®Windows®XP SP2 operating system or Windows 7 operating system
• 1280 × 1024 or greater display screen resolution
3.2 Installing the Software (PC Application)
Before installing the software, make sure the AFE4403EVM is NOT connected to the PC. If using a
machine with Windows 7 OS, we recommend having administrator rights to avoid problems during
installation. Unzip the installer file, and then find and double click setup.exe to install the software. Unless
otherwise specified during the install process, the software installs at the following location:
• On a Windows XP machine
–C:\Program Files\Texas Instruments\AFE4403EVM GUI
• On a Windows 7 machine
–C:\Program Files(x86)\Texas Instruments\AFE4403EVM GUI
It creates a program menu item, AFE4403EVM GUI under Programs→Texas Instruments→AFE4403EVM
GUI to execute the software. The following steps ensure proper installation of the PC application.
Click setup.exe and follow the prompts to continue with the installation process.
Select the destination directory and click the Next>> button.
Figure 2. PC Application Installation - Screen 1
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Accept the NI Software License Agreement and click the Next>> button.
Figure 3. PC Application Installation - Screen 2
Accept the license agreement and click the Next>> button.
Figure 4. PC Application Installation - Screen 3
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Click the Next>> button to begin the installation.
Figure 5. PC Application Installation - Screen 4
The application software is now installed. Once the installation is complete, click the Next>> button to
continue with the installation of Python v2.7.
Figure 6. PC Application Installation - Screen 5
Once the Python v2.7 is installed, click the OK button. The PC application is now ready to use.
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Figure 7. Python Installation
3.3 Installing the USB Drivers
The communication interface between the AFE4403EVM board and PC is through the USB, using the
CDC profile. A one-time installation of the USB driver is required for the communication between the
AFE4403EVM and PC application.
Following the steps below ensures proper installation of the USB drivers:
1. Plugin the USB-to-mini USB cable to J4 of AFE4403EVM and the other end to the USB port on the
PC.
2. Win XP OS starts up the New Hardware Wizard to enable the user to install the USB driver for the new
hardware. The Windows 7 OS attempts to find the driver for the new hardware found automatically and
if the driver is not found, there is no pop-up message to indicate that the driver installation failed. In the
Windows 7 OS, click on Device Manager, right click on MSP430-USB example under Other devices
and click on Update Driver Software as shown in Figure 8. This step is not required for the Windows
XP OS.
Figure 8. USB Driver Installation - Screen 1 (Windows 7 OS only)
3. Select the Browse my computer for driver software option
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Figure 9. USB Driver Installation - Screen 2
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4. As shown in Figure 10, navigate to the directory where the AFE44xx.inf file is located by clicking the
Browse button. The file is located at the following path:
• On a Windows XP machine:
–C:\Program Files\Texas Instruments\AFE4403EVM GUI\USB Driver
• On a Windows 7 machine:
–C:\Program Files(x86)\Texas Instruments\AFE4403EVM GUI\USB Driver
Click the Next button to continue. The Driver file is copied to the system directory after clicking the
Next button.
Figure 10. USB Driver Installation - Screen 3
5. There may be a warning that Windows can't verify the publisher of this driver software, as shown in
Figure 11. Choose to install the driver software anyway to proceed.
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Figure 11. Windows Publisher Verification Warning
6. Click the Close button once the driver installation is complete (Figure 12).
Figure 12. USB Driver Installation - Screen 4
7. The AFE4403EVM is now recognized as Virtual COM Port under the Device Manager as shown in
Figure 13.
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Figure 13. Device Manager Screen
The USB driver installation is now complete and the EVM is ready to use.
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3.3.1 Windows 8 Installing Unsigned Drivers
Perform an advanced startup sequence to let Windows 8 install unsigned drivers.
Move the cursor to the top right of the screen, click settings, then power, then HOLD SHIFT and click
Restart as shown in Figure 14.
Figure 14. Windows 8 Installing Unsigned Drivers - Screen 1
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After a loading screen, three options appear. Choose Troubleshoot as shown in Figure 15.
Figure 15. Windows 8 Installing Unsigned Drivers - Screen 2
Choose advanced options as shown in Figure 16.
Figure 16. Windows 8 Installing Unsigned Drivers - Screen 3
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Choose startup Settings as shown in Figure 17.
Figure 17. Windows 8 Installing Unsigned Drivers - Screen 4
Next a list of options displays. Click Restart at the bottom right as shown in Figure 18.
Figure 18. Windows 8 Installing Unsigned Drivers - Screen 5
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After the computer restarts, the following screen appears (see Figure 19). Press F7 to disable driver
signature enforcement.
Figure 19. Windows 8 Installing Unsigned Drivers - Screen 6
Now, the user can install unsigned drivers. A warning may appear as shown in Figure 20; choose Install
this driver software anyway.
Figure 20. Windows 8 Installing Unsigned Drivers - Screen 7
Restart the computer again to re-enable driver signature enforcement after the installation is complete.
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4 Running the Software
Run the GUI software from the Start menu by selecting
All Programs→Texas Instruments→AFE4403EVM GUI. Unless the hardware has been disconnected,
observe messages that confirm the connection has been established and the program waits in idle mode
for user input.
If the connection to the AFE4403EVM board is not established, the program prompts to continue to run
the GUI in Simulation mode, or to Stop and Close the GUI and check if the AFE4403EVM is connected to
the PC.
Figure 21. AFE4403EVM Not Connected Error Message
4.1 Overview of the Features
This section provides a quick overview of the various features and functions of the AFE4403EVM software
GUI. The GUI allows the user to easily configure the various functions of the AFE, such as receiver gain,
bandwidth settings, LED current settings, and timing/clocking control settings.
Operations in the GUI should only be performed after the status bar (located at the bottom of the GUI)
displays Ready For New Command.
The main tabs consist of:
•About – Product Safety Warnings, Restrictions and Disclaimers (see Figure 22).
•Device Configuration – Configures all the AFE4403 user registers in a series of related subtabs.
–Global Settings
–Tx Stage
–Rx Stage
–Timing Controls
–Low Level Configuration
• ADC Capture & Analysis – For viewing and analyzing the raw data.
• Save – For writing data samples and analysis results to a file.
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Figure 22. Product Safety Warnings, Restrictions and Disclaimers
4.1.1 Device Configuration Tab
The Device Configuration tab allows configuration of the various registers of the AFE4403 device. This
subtab contains five subtabs: Global Settings,Tx Stage,Rx Stage,Timing Controls and Low Level
Configuration.
4.1.1.1 Global Settings Subtab
The Global Settings subtab for the AFE4403 device shown in Figure 23 has the following features:
1. View the Device ID and Firmware Revision
2. Device Reset button that resets the device. (Please note that after a device reset is issued, the
AFE4403 device registers must be programmed correctly for the PC application GUI to function
properly. See Reset to EVM Defaults on how to issue a device reset and also program the AFE4403
registers to the EVM default register settings)
3. Reset to EVM Defaults button that resets the device and sets up the board to the EVM default
register settings.
4. Enables the user to set or reset:
(a) SPI Read
(b) XTAL Disable
(c) Powerdown AFE
(d) Powerdown TX
(e) Powerdown RX
(f) Enable Slow Diag Clock
(g) Four controls for dynamic powerdown
(h) CLKOUT Output State
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