SAT - ECG with Bluetooth Low Energy
- 1 Purpose of this Wiki Page
- 2 EVM Overview
- 3 Hardware Description
- 4 Battery Life Calculation
- 5 Antenna Simulations
- 6 Schematics and BOM
- 7 Layout
- 8 Gerber Files
- 9 Altium Project Files
- 10 Firmware Section
- 11 iOS Software Description
- 12 FCC Report
- 13 Precautions and Certifications
- 14 Important Notices
- 14.1 Evaluation Board/Kit/Module (EVM) Additional Terms
- 14.2 Regulatory Compliance Information
- 14.2.1 General Statement for EVMs including a radio
- 14.2.2 For EVMs annotated as FCC – FEDERAL COMMUNICATIONS COMMISSION Part 15 Compliant
- 14.2.3 FCC Interference Statement for Class A EVM devices
- 14.2.4 FCC Interference Statement for Class B EVM devices
- 14.2.5 For EVMs annotated as IC – INDUSTRY CANADA Compliant
- 14.2.6 Concerning EVMs including radio transmitters
- 14.2.7 Concerning EVMs including detachable antennas
- 14.2.8 Concernant les EVMs avec appareils radio
- 14.2.9 Concernant les EVMs avec antennes détachables
- 14.3 Important Notice for Users of this Product in Japan
- 14.4 EVALUATION BOARD/KIT/MODULE (EVM) WARNINGS, RESTRICTIONS AND DISCLAIMERS
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.
Reference Design Description
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.
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
- 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)
- 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)
- 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
- 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
- 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
- Output Overvoltage
- Input Undervoltage Lockout
- Adjustable Output Voltage from 1.8 V to 5.5 V
- Fixed Output Voltage Versions
- Small 6-pin SC-70 Package
- 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
- 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
- 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)
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)
The Gas Sensor Platform with Bluetooth Low Energy Reference Design features the following devices:
- CC2541-2.4-GHz Bluetooth® low energy and Proprietary System-on-Chip
- TPS61220 - Low Input Voltage, 0.7V Boost Converter with 5.5μA Quiescent Current
- ADS1293-Complete Low Power Integrated Analog Front End for ECG Applications
Figure 3: Block Diagram of ECG Platform with Bluetooth Low Energy
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.
Battery Life Calculation
It is highly recommended that for battery life calculations, below app note is refered to..
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.
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.
Figure 7: Current Consumption-Active vs Sleep Modes
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.
Figure 8: Ansoft Antenna Simulation Setup
Figure 9: Antenna Sims with Power Board
Figure 10: Antenna Sims Matching with Power Board
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.
Figure 12: Antenna Sims Setup without the battery board
Figure 13: Antenna Sims Results without the battery board
Figure 14: Antenna Sims Matching without the battery board
Figure 15: Antenna Sims Field Propogation without the battery board
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
Figure 17: Summary
Schematics and BOM
Download a PDF of SAT0009 (Power Board).
Figure 18: Power Section
Figure 19: Power Section BOM
Download a PDF of SAT0010 AFE (LMP91000) and BLE (CC2541).
Figure 20: BLE Section
Figure 21: AFE Section
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. ****
Download a PDF of SAT0009 (Power Board) Layer Plots.
Figure 23: Power Board
Download a PDF of SAT0010 (AFE and BLE Board) Layer Plots.
Figure 24: BLE and AFE Board
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.
Figure 25: Power Board
Download a zip of SAT0010 - AFE and BLE Board.
Figure 26: AFE and BLE Board
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 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.
Figure 27: CC Debugger
Figure 28: Launching IAR
Launch the project file as shown above.
Figure 29: IAR version in use
Ensure that you are using the version either the same or above this one.
Figure 30: Main Loop
Highlighting the main.c as shown above.
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.
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.
Figure 33: CO Settings
All the key configuration settings for LMP91000 have been co-located for easy update to the firmware.
Figure 34: Adding new Sensor
New sensor services can be added to the firmware as shown above.
iOS Software Description
The Gas Sensor Platform is compliant with FCC and EU radiation requirements
Precautions and Certifications
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.
Evaluation Board/Kit/Module (EVM) Additional Terms
Texas Instruments (TI) provides the enclosed Evaluation Board/Kit/Module (EVM) under the following conditions:
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.
No license is granted under any patent right or other intellectual property right of TI covering or relating to any machine, process, or combination in which such TI products or services might be or are used. TI currently deals with a variety of customers for products, and therefore our arrangement with the user is not exclusive. TI assumes no liability for applications assistance, customer product design, software performance, or infringement of patents or services described herein.
Regulatory Compliance Information
As noted in the EVM User’s Guide and/or EVM itself, this EVM and/or accompanying hardware may or may not be subject to the Federal Communications Commission (FCC) and Industry Canada (IC) rules.
For EVMs not subject to the above rules, this evaluation board/kit/module is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION OR EVALUATION PURPOSES ONLY and is not considered by TI to be a finished end product fit for general consumer use. It generates, uses, and can radiate radio frequency energy and has not been tested for compliance with the limits of computing devices pursuant to part 15 of FCC or ICES-003 rules, which are designed to provide reasonable protection against radio frequency interference. Operation of the equipment may cause interference with radio communications, in which case the user at his own expense will be required to take whatever measures may be required to correct this interference.
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.
For EVMs annotated as FCC – FEDERAL COMMUNICATIONS COMMISSION Part 15 Compliant
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.
FCC Interference Statement for Class A EVM devices
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.
FCC Interference Statement for Class B EVM devices
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:
- 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,
- 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
- 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.
Texas Instruments Japan Limited (address) 24-1, Nishi-Shinjuku 6 chome, Shinjukku-ku, Tokyo, Japan
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.
Your Sole Responsibility and Risk
You acknowledge, represent and agree that:
- You have unique knowledge concerning Federal, State and local regulatory requirements (including but not limited to Food and Drug Administration regulations, if applicable) which relate to your products and which relate to your use (and/or that of your employees, affiliates, contractors or designees) of the EVM for evaluation, testing and other purposes.
- You have full and exclusive responsibility to assure the safety and compliance of your products with all such laws and other applicable regulatory requirements, and also to assure the safety of any activities to be conducted by you and/or your employees, affiliates, contractors or designees, using the EVM. Further, you are responsible to assure that any interfaces (electronic and/or mechanical) between the EVM and any human body are designed with suitable isolation and means to safely limit accessible leakage currents to minimize the risk of electrical shock hazard.
- 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.
- You will take care of proper disposal and recycling of the EVM’s electronic components and packing materials.
It is important to operate this EVM within TI’s recommended specifications and environmental considerations per the user guidelines. Exceeding the specified EVM ratings (including but not limited to input and output voltage, current, power, and environmental ranges) may cause property damage, personal injury or death. If there are questions concerning these ratings please contact a TI field representative prior to connecting interface electronics including input power and intended loads. Any loads applied outside of the specified output range may result in unintended and/or inaccurate operation and/or possible permanent damage to the EVM and/or interface electronics. Please consult the EVM User's Guide prior to connecting any load to the EVM output. If there is uncertainty as to the load specification, please contact a TI field representative. During normal operation, some circuit components may have case temperatures greater than 60°C as long as the input and output are maintained at a normal ambient operating temperature. These components include but are not limited to linear regulators, switching transistors, pass transistors, and current sense resistors which can be identified using the EVM schematic located in the EVM User's Guide. When placing measurement probes near these devices during normal operation, please be aware that these devices may be very warm to the touch. As with all electronic evaluation tools, only qualified personnel knowledgeable in electronic measurement and diagnostics normally found in development environments should use these EVMs.
Agreement to Defend, Indemnify and Hold Harmless
You agree to defend, indemnify and hold TI, its licensors and their representatives harmless from and against any and all claims, damages, losses, expenses, costs and liabilities (collectively, "Claims") arising out of or in connection with any use of the EVM that is not in accordance with the terms of the agreement. This obligation shall apply whether Claims arise under law of tort or contract or any other legal theory, and even if the EVM fails to perform as described or expected.
Safety-Critical or Life-Critical Applications
If you intend to evaluate the components for possible use in safety critical applications (such as life support) where a failure of the TI product would reasonably be expected to cause severe personal injury or death, such as devices which are classified as FDA Class III or similar classification, then you must specifically notify TI of such intent and enter into a separate Assurance and Indemnity Agreement.