SAT - ECG with Bluetooth Low Energy

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Contents

Purpose of this Wiki Page

This page explains the ECG Platform with Bluetooth Low Energy Reference Design in detail. After reading this guide, a user should better understand the features and usage of this module. The platform comprises a single board (SAT0015 - TI Internal reference number) to which the battery can be connected easily.

EVM Overview

Reference Design Description

ECGblockdiagram ECG (2).jpg

Figure 1: Block Diagram


The system runs on a 3.6V lithium ion battery. The heart of this platform is the TI AFE ADS1293. ADS1293 interfaces directly to the ECG leads. ADS1293 interfaces to CC2541 which is a Bluetooth Low Energy SOC from TI. There can be an application running on an iOS device that customers can use to interface to the system. The ADS1293 incorporates all features commonly required in portable, low-power medical, sports, and fitness electrocardiogram (ECG) applications. With high levels of integration and exceptional performance, the ADS1293 enables the creation of scalable medical instrumentation systems at significantly reduced size, power, and overall cost. The ECG Platform with Bluetooth Low Energy would help customers who are looking for a low power configurable AFE front end as well as integrating wireless feature in ECG applications get to market faster and would help them differentiate on performance and feature sets.




Features

ECG with Bluetooth Low Energy Design Features

  • 3.6V Lithium-Ion battery
  • Low Power Configurable AFE ADS1293
  • Provides reference design for Bluetooth low energy (BLE) antenna design - leveraging low cost trace antenna
  • Enables customer to use this platform and incorporate wireless feature in their ECG applications

TI Part Number Features

  • CC2541
    Radio
    • 2.4-GHz low energy Compliant and Proprietary RF System-on-Chip
    • Supports 250-kbps, 500-kbps, 1-Mbps, 2-Mbps Data Rates
    • Excellent Link Budget, Enabling Long-Range Applications Without External Front End
    • Programmable Output Power up to 0 dBm
    • Excellent Receiver Sensitivity (–94 dBm at 1 Mbps), Selectivity, and Blocking Performance
    • Suitable for Systems Targeting Compliance With Worldwide Radio Frequency Regulations:
    • ETSI EN 300 328 and EN 300 440 Class 2 (Europe), FCC CFR47 Part 15 (US), and ARIB STD-T66 (Japan)
    Layout
    • Few External Components
    • Reference Design Provided
    • 6-mm × 6-mm QFN-40 Package
    • Pin-Compatible With CC2540 (When Not Using USB or I2C)
    Low Power
    • Active-Mode RX Down to: 17.9 mA
    • Active-Mode TX (0 dBm): 18.2 mA
    • Power Mode 1 (4-µs Wake-Up): 270 µA
    • Power Mode 2 (Sleep Timer On): 1 µA
    • Power Mode 3 (External Interrupts): 0.5 µA
    • Wide Supply-Voltage Range (2 V–3.6 V)
    • TPS62730 Compatible Low Power in Active Mode
    • RX Down to: 14.7 mA (3-V supply)
    • TX (0 dBm): 14.3 mA (3-V supply)
    Microcontroller
    • High-Performance and Low-Power 8051 Microcontroller Core With Code Prefetch
    • In-System-Programmable Flash, 128- or 256-KB
    • 8-KB RAM With Retention in All Power Modes
    • Hardware Debug Support
    • Extensive Baseband Automation, Including Auto-Acknowledgment and Address Decoding
    • Retention of All Relevant Registers in All Power Modes
    Peripherals
    • Powerful Five-Channel DMA
    • General-Purpose Timers (One 16-Bit, Two 8-Bit)
    • IR Generation Circuitry
    • 32-kHz Sleep Timer With Capture
    • Accurate Digital RSSI Support
    • Battery Monitor and Temperature Sensor
    • 12-Bit ADC With Eight Channels and Configurable Resolution
    • AES Security Coprocessor
    • Two Powerful USARTs With Support for Several Serial Protocols
    • 23 General-Purpose I/O Pins
    • (21 × 4 mA, 2 × 20 mA)
    • I2C interface
    • 2 I/O Pins Have LED Driving Capabilities
    • Watchdog Timer
    • Integrated High-Performance Comparator
    Development Tools
    • CC2541 Evaluation Module Kit (CC2541EMK)
    • CC2541 Mini Development Kit (CC2541DK-MINI)
    • SmartRF™ Software
    • IAR Embedded Workbench™ Available
  • TPS61220
    • Up to 95% Efficiency at Typical Operating Conditions
    • 5.5 µ Quiescent Current
    • Startup Into Load at 0.7 V Input Voltage
    • Operating Input Voltage from 0.7 V to 5.5 V
    • Pass-Through Function during Shutdown
    • Minimum Switching Current 200 mA
    Protections
    • Output Overvoltage
    • Overtemperature
    • Input Undervoltage Lockout
    • Adjustable Output Voltage from 1.8 V to 5.5 V
    • Fixed Output Voltage Versions
    • Small 6-pin SC-70 Package
    Applications
    • Battery Powered Applications
    • 1 to 3 Cell Alkaline, NiCd or NiMH
    • 1 cell Li-Ion or Li-Primary
    • Solar or Fuel Cell Powered Applications
    • Consumer and Portable Medical Products
    • Personal Care Products
    • White or Status LEDs
    • Smartphones
  • ADS1293
    • 3 high resolution digital ECG channels with simultaneou pace output
    • EMI hardened inputs
    • Low Power: 0.3mW/channel
    • Input-Referred Noise: 7μVpp (40Hz Bandwidth)
    • Input Bias Current: 175pA
    • Data Rate: Up to 25.6ksps
    • Differential Input Voltage Range: ±400mV
    • Analog Supply Voltage: 2.7V to 5.5V
    • Digital I/O Supply Voltage: 1.65V to 3.6V
    • Right Leg Drive Amplifier
    • AC and DC Lead-Off Detection
    • Wilson and Goldberger Terminals
    • ALARMB Pin for Interrupt Driven Diagnostics
    • Battery Voltage Monitoring
    • Built-In Oscillator and Reference
    • Flexible Power-Down and Standby Modes
    Applications
    • Portable 1/2/3/5/6/7/8/12-Lead ECG
    • Patient vital sign monitoring: holter, event,stress, and telemedicine
    • Automated External Defibrillator
    • Sports and fitness (heart rate and ECG)

Featured Applications

The ECG Platform with Bluetooth Low Energy Reference Platform was designed to demonstrate how a configurable AFE can be used with a low power wireless radio and thus provide customers a reference platforms to develop their next generation ECG solutions :

  • Sports and fitness (heart rate and ECG)
  • Automated External Defibrillator
  • Patient vital sign monitoring: holter, event, stress, and telemedicine
  • Automated External Defibrillator
  • Sports and fitness (heart rate and ECG)

Highlighted Products

The Gas Sensor Platform with Bluetooth Low Energy Reference Design features the following devices:

Block Diagram

ECGblockdiagram ECG (2).jpg

Figure 3: Block Diagram of ECG Platform with Bluetooth Low Energy



EVM Wiki

The most up-to-date information on this Reference Design can be found at the

EVM Landing Page

This module is currently not available for order.

Hardware Description

Battery Life Calculation

It is highly recommended that for battery life calculations, below app note is refered to..

CC2541 Battery Life Calculation

It is not possible to compare the power consumption of a BLE device to another using a single metric. For example, sometimes a device gets rated by its “peak current”. While the peak current plays a part in the total power consumption, a device running the BLE stack will only be consuming current at the peak level while it is transmitting. Even in very high throughput systems, a BLE device is transmitting only for a small percentage of the total time that the device is connected.


Current consumption.jpg

Figure 6: Current Consumption




In addition to transmitting, a BLE device will most likely go through several other states, such as receiving, sleeping, waking-up from sleep, etc… Even if a device’s current consumption in each different state is known, this is still not enough information to determine the total power consumed by the device. The different layers of the BLE stack all require certain amounts of processing in order to remain connected and comply with the protocol’s specifications. The MCU takes time to perform this processing, and during this time current is consumed by the device. In addition, the device might take some time when switching between states. All of this must be taken into account in order to get an accurate measurement of the total current consumed.

Current consumption active.jpg

Figure 7: Current Consumption-Active vs Sleep Modes



Antenna Simulations

The following data was simulated using High Frequency Structural Simulator (HFSS).

The Gas Sensor Platform with Bluetooth Low Energy platform is a stackup of 2 (1 inch diameter boards).

Goal of the Antenna Simulations was:

  • Validate that the 2.45GHz antenna performs as expected.
  • Estimate the influence of the battery board, by running simulations with and without the battery board.


Simulations with the Battery Board (SAT0009) First simulation was done with both boards to see the effect of the power board (SAT0009) to the BLE antenna located on SAT0010.


Setup Antenna.jpg

Figure 8: Ansoft Antenna Simulation Setup




SAT Antenna with battery table1.jpg

Figure 9: Antenna Sims with Power Board



Antenna matching.jpg

Figure 10: Antenna Sims Matching with Power Board




SAT Antenna with battery Electrical FieldProp.jpg

Figure 11: Antenna Sims Electrical Field Propogation with Power Board



Next simulation was done without the power board (SAT0009) to determine if there was any performance improvement of the BLE antenna on SAT0010.



SAT Antenna without battery.jpg

Figure 12: Antenna Sims Setup without the battery board




SAT Antenna without battery table.jpg

Figure 13: Antenna Sims Results without the battery board




Antenna matching without battery.jpg

Figure 14: Antenna Sims Matching without the battery board




SAT Antenna without battery Electrical FieldProp.jpg

Figure 15: Antenna Sims Field Propogation without the battery board



Improved Antenna matching.jpg

Figure 16: Improved Antenna Matching



Antenna matching was improved by increasing the inductor from 3nH to 5nH. New value was 10dB return loss, which was better


Summary.jpg

Figure 17: Summary





Schematics and BOM

Download a PDF of SAT0009 (Power Board).

SAT Gas Sensor Platform with Bluetooth Low Energy - Power Board Schematic and BOM


Power Section


Figure 18: Power Section




SAT0009 BOM


Figure 19: Power Section BOM




Download a PDF of SAT0010 AFE (LMP91000) and BLE (CC2541).

SAT Gas Sensor Platform with Bluetooth Low Energy - BLE and AFE Section


BLE - CC2541


Figure 20: BLE Section




AFE


Figure 21: AFE Section




SAT0010 BOM


Figure 22: BLE Section BOM




****Note that C29 and C32 on SAT0010 are caps that provide low pass filtering to the Analog output signals (Vout and C2) from LMP91000. In the schematic, they are placed as placeholders and shown as DNP - Do not populate. During testing of this platform it was noted that a value of .01uF was most optimized for C29 and C32 for this particular platform. Customers can fine tune this selection based on their system design. ****


Layout

Download a PDF of SAT0009 (Power Board) Layer Plots.

SAT Gas Sensor Platform with Bluetooth Low Energy - SAT0009 (Power Board) Layer Plots


Power Board Layer Plots


Figure 23: Power Board




Download a PDF of SAT0010 (AFE and BLE Board) Layer Plots.

SAT Gas Sensor Platform with Bluetooth Low Energy - SAT0010 (AFE and BLE Board) Layer Plots


AFE BLE Board Layer Plots


Figure 24: BLE and AFE Board



Gerber Files

Download a zip of SAT0009 - Power Board.


Download a zip of SAT0010 - AFE and BLE Board.



Altium Project Files

Download a zip of SAT0009 - Power Board.


Power Section

Figure 25: Power Board





Download a zip of SAT0010 - AFE and BLE Board.



Power Section


Figure 26: AFE and BLE Board



Firmware Section


One of the development platform for CC2451 8051 microcontroller is IAR development platform. IAR Development Platform.

To communicate to the development platform via IAR, CC debugger is required. CC debugger can be purchased from

CC Debugger.

CC Debugger needs to be connected to the 10 pin header located on the SAT0010 board. Make sure that the notch on the cable that connects to the 10 pin header is facing away from the sensor or towards outside. If connected properly, the LED on the CC debugger should go green.


CC Debugger


Figure 27: CC Debugger





IAR


Figure 28: Launching IAR



Launch the project file as shown above.


IAR version


Figure 29: IAR version in use



Ensure that you are using the version either the same or above this one.


main loop


Figure 30: Main Loop



Highlighting the main.c as shown above.


Communication Settings


Figure 31: Communication Settings



To change the number of times the Bluetooth radio communicates to the iOS app, can be easily changed by the highlighted variable above.


Case Statement CO/O2


Figure 32: Sensor Section



The firmware has a case statement to easily change from a CO to an O2 sensor as shown above. Note the 'x' in front of the CO option.


LMP91000 settings


Figure 33: CO Settings



All the key configuration settings for LMP91000 have been co-located for easy update to the firmware.


Add new sensor


Figure 34: Adding new Sensor



New sensor services can be added to the firmware as shown above.

iOS Software Description

FCC Report

The Gas Sensor Platform is compliant with FCC and EU radiation requirements

Download a pdf ETSI EN 301 489-17, v2.1.1.
Download a pdf FCC part 15, subpart B & ICES-003, Issue 4.
Download a pdf EN 300 328: v1.7.1 .

Precautions and Certifications

ESD Precautions

The following guidelines should be followed in order to avoid ESD damage to the board components:

  • Any person handling boards must be grounded either with a wrist strap or ESD protective footwear, used in conjunction with a conductive or static-dissipative floor or floor mat.
  • The work surface where boards are placed for handing, processing, testing, etc., must be made of static-dissipative material and be grounded to ESD ground.
  • All insulator materials either must be removed from the work area or they must be neutralized with an ionizer. Static-generating clothes should be covered with an ESD-protective smock.
  • When boards are being stored, transferred between operations or workstations, or shipped, they must be maintained in a Faraday-shield container whose inside surface (touching the boards) is static dissipative.

Certifications

FCC and IECS standard EMC test report for the RF-CC1120DIV-MVK MAVRK module, aboard the MAVRK Pro Motherboard

Eco-Info & Lead-Free Home

RoHS Compliant Solutions

Statement on Registration, Evaluation, Authorization of Chemicals (REACh)

Important Notices

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The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user indemnifies TI from all claims arising from the handling or use of the goods.

Should this evaluation board/kit not meet the specifications indicated in the User’s Guide, the board/ kit may be returned within 30 days from the date of delivery for a full refund. THE FOREGOING LIMITED WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY SELLER TO BUYER AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE. EXCEPT TO THE EXTENT OF THE INDEMNITY SET FORTH ABOVE, NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES.

Please read the User's Guide and, specifically, the Warnings and Restrictions notice in the User's Guide prior to handling the product. This notice contains important safety information about temperatures and voltages. For additional information on TI's environmental and/or safety programs, please visit www.ti.com/esh or contact TI.

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General Statement for EVMs including a radio

User Power/Frequency Use Obligations: This radio is intended for development/professional use only in legally allocated frequency and power limits. Any use of radio frequencies and/or power availability of this EVM and its development application(s) must comply with local laws governing radio spectrum allocation and power limits for this evaluation module. It is the user’s sole responsibility to only operate this radio in legally acceptable frequency space and within legally mandated power limitations. Any exceptions to this is strictly prohibited and unauthorized by Texas Instruments unless user has obtained appropriate experimental/development licenses from local regulatory authorities, which is responsibility of user including its acceptable authorization.

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Caution

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This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instruction manual, may cause harmful interference to radio communications. Operation of this equipment in a residential area is likely to cause harmful interference in which case the user will be required to correct the interference at his own expense.

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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.

For EVMs annotated as IC – INDUSTRY CANADA Compliant

This Class A or B digital apparatus complies with Canadian ICES-003.

Changes or modifications not expressly approved by the party responsible for compliance could void the user’s authority to operate the equipment.

Concerning EVMs including radio transmitters

This device complies with Industry Canada licence-exempt RSS standard(s). Operation is subject to the following two conditions: (1) this device may not cause interference, and (2) this device must accept any interference, including interference that may cause undesired operation of the device.

Concerning EVMs including detachable antennas

Under Industry Canada regulations, this radio transmitter may only operate using an antenna of a type and maximum (or lesser) gain approved for the transmitter by Industry Canada. To reduce potential radio interference to other users, the antenna type and its gain should be so chosen that the equivalent isotropically radiated power (e.i.r.p.) is not more than that necessary for successful communication. This radio transmitter has been approved by Industry Canada to operate with the antenna types listed in the user guide with the maximum permissible gain and required antenna impedance for each antenna type indicated. Antenna types not included in this list, having a gain greater than the maximum gain indicated for that type, are strictly prohibited for use with this device.

~

Cet appareil numérique de la classe A ou B est conforme à la norme NMB-003 du Canada.

Les changements ou les modifications pas expressément approuvés par la partie responsable de la conformité ont pu vider l’autorité de l'utilisateur pour actionner l'équipement.

Concernant les EVMs avec appareils radio

Le présent appareil est conforme aux CNR d'Industrie Canada applicables aux appareils radio exempts de licence. L'exploitation est autorisée aux deux conditions suivantes : (1) l'appareil ne doit pas produire de brouillage, et (2) l'utilisateur de l'appareil doit accepter tout brouillage radioélectrique subi, même si le brouillage est susceptible d'en compromettre le fonctionnement.

Concernant les EVMs avec antennes détachables

Conformément à la réglementation d'Industrie Canada, le présent émetteur radio peut fonctionner avec une antenne d'un type et d'un gain maximal (ou inférieur) approuvé pour l'émetteur par Industrie Canada. Dans le but de réduire les risques de brouillage radioélectrique à l'intention des autres utilisateurs, il faut choisir le type d'antenne et son gain de sorte que la puissance isotrope rayonnée équivalente (p.i.r.e.) ne dépasse pas l'intensité nécessaire à l'établissement d'une communication satisfaisante.

Le présent émetteur radio a été approuvé par Industrie Canada pour fonctionner avec les types d'antenne énumérés dans le manuel d’usage et ayant un gain admissible maximal et l'impédance requise pour chaque type d'antenne. Les types d'antenne non inclus dans cette liste, ou dont le gain est supérieur au gain maximal indiqué, sont strictement interdits pour l'exploitation de l'émetteur.

Important Notice for Users of this Product in Japan

This development kit is NOT certified as Confirming to Technical Regulations of Radio Law of Japan! If you use this product in Japan, you are required by Radio Law of Japan to follow the instructions below with respect to this product:

  1. Use this product in a shielded room or any other test facility as defined in the notification #173 issued by Ministry of Internal Affairs and Communications on March 28, 2006, based on Sub-section 1.1 of Article 6 of the Ministry’s Rule for Enforcement of Radio Law of Japan,
  2. Use this product only after you obtained the license of Test Radio Station as provided in Radio Law of Japan with respect to this product, or
  3. Use of this product only after you obtained the Technical Regulations Conformity Certification as provided in Radio Law of Japan with respect to this product.

Also, please do not transfer this product, unless you give the same notice above to the transferee. Please note that if you could not follow the instructions above, you will be subject to penalties of Radio Law of Japan.

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http://www.tij.co.jp

【ご使用にあたっての注意】

本開発キットは技術基準適合証明を受けておりません。

本製品のご使用に際しては、電波法遵守のため、以下のいずれかの措置を取っていただく必要がありますのでご注意ください。

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なお、本製品は、上記の「ご使用にあたっての注意」を譲渡先、移転先に通知しない限り、譲渡、移転できないものとします。

上記を遵守頂けない場合は、電波法の罰則が適用される可能性があることをご留意ください。

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http://www.tij.co.jp

EVALUATION BOARD/KIT/MODULE (EVM) WARNINGS, RESTRICTIONS AND DISCLAIMERS

For Feasibility Evaluation Only, in Laboratory/Development Environments

Unless otherwise indicated, this EVM is not a finished electrical equipment and not intended for consumer use. It is intended solely for use for preliminary feasibility evaluation in laboratory/development environments by technically qualified electronics experts who are familiar with the dangers and application risks associated with handling electrical mechanical components, systems and subsystems. It should not be used as all or part of a finished end product.

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  3. You will employ reasonable safeguards to ensure that your use of the EVM will not result in any property damage, injury or death, even if the EVM should fail to perform as described or expected.
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