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Theory of Operation

www.ti.com

3.2

Battery Life Calculation

For battery life calculations, TI highly recommends that the user reviews

CC2541 Battery Life Calculation

,

SWRA347

.

Comparing the power consumption of a BLE device to another device using a single metric is impossible.
For example, 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 only consumes current at the peak level during
transmission. Even in very high throughput systems, a BLE device is transmitting for only a small
percentage of the total time that the device is connected (see

Figure 6

).

Figure 6. Current Consumption

In addition to transmitting, there are other factors to consider when calculating battery life. A BLE device
can go through several other modes, such as receiving, sleeping, and waking up from sleep. Even if the
current consumption of a device in each different mode is known, there is not enough information to
determine the total power consumed by the device. Each layer of the BLE stack requires a certain amount
of processing to remain connected and to comply with the specifications of the protocol. The MCU takes
time to perform this processing, and during this time, current is consumed by the device. In addition, some
power might be consumed while the device switches between modes (see

Figure 7

). All of this must be

considered to get an accurate measurement of the total current consumed.

Figure 7. Current Consumption-Active versus Sleep Modes

10

Wireless Heart Rate Monitor Reference Design

TIDU195A – January 2014 – Revised July 2014

Submit Documentation Feedback

Copyright © 2014, Texas Instruments Incorporated

Summary of Contents for TI Designs

Page 1: ...on ADS1293 Product Folder Powered by a Lithium ion battery CC2541 Product Folder TPS61220 Product Folder EMI filters integrated in the ADS1293 device reject Interference from outside RF sources Small Programmer and Debugger for CC Debugger Low Power RF System on Chips Open source Firmware and iOS application enables quick time to market for customers Featured Applications Health and Fitness ASK Ou...

Page 2: ...hip SoC solution for both Bluetooth low energy and proprietary 2 4 GHz applications It enables robust network nodes to be built with low total bill of material costs The CC2541 combines the excellent performance of a leading RF transceiver with an industry standard enhanced 8051 MCU in system programmable flash memory 8 KB RAM and many other powerful supporting features and peripherals The CC2541 ...

Page 3: ...1293 Low Power 3 Channel 24 Bit Analog Front End for Biopotential Measurements CC2541 2 4 GHz Bluetooth low energy and Proprietary System on Chip TPS61220 TPS6122x Low Input Voltage 0 7V Boost Converter With 5 5μA Quiescent Current For more information on each of these devices see the respective product folders at www TI com 3 TIDU195A January 2014 Revised July 2014 Wireless Heart Rate Monitor Ref...

Page 4: ... RLDIN PACE2WCT WILSON_CN CH1 CH2 CH3 CH4 InA Block Diagram www ti com 2 1 1 ADS1293 Figure 2 ADS1293 Block Diagram Low current consumption Duty Cycle mode 120 μA Normal mode 415 μA Wide supply range 2 3 V to 5 5 V Programmable gain 1 V V to 128 V V Programmable data rates Up to 2 kSPS 50 Hz and 60 Hz rejection at 20 SPS Low noise PGA 90 nVRMS at 20 SPS Dual matched programmable current sources 10...

Page 5: ...R IRQ CTRL FLASH UNIFIED RF_P RF_N SYNTH MODULATOR POWER ON RESET BROWN OUT RADIO REGISTERS POWER MGT CONTROLLER SLEEP TIMER PDATA XRAM IRAM SFR XOSC_Q2 XOSC_Q1 DS ADC AUDIO DC DIGITAL ANALOG MIXED VDD 2 0 3 6 V DCOUPL ON CHIP VOLTAGE REGULATOR Link Layer Engine FREQUENCY SYNTHESIZER I2C DEMODULATOR RECEIVE TRANSMIT OP AMP ANALOG COMPARATOR I O CONTROLLER 1 KB SRAM Radio Arbiter FIFOCTRL SDA SCL w...

Page 6: ... 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...

Page 7: ...and decryption L2CAP Sample applications and profiles Generic applications for GAP central and peripheral roles Proximity accelerometer simple keys and battery GATT services More applications supported in BLE Software Stack Multiple configuration options Single chip configuration allowing applications to run on CC2541 Network processor interface for applications running on an external microcontrol...

Page 8: ... 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 6 V Fixed output voltage versions Small 6 pin SC 70 package 8 Wireless Heart Rate Monitor Reference Design TIDU195A January 2014 Revised July 2014 Sub...

Page 9: ...rcuit NOTE The ideal values of R1 R2 and C1 will vary per system application typical values for these components are R1 100kΩ R2 1MΩ and C1 1 5nF The output of the RLD amplifier is connected to the right leg electrode which is IN4 to drive the common mode of the patient s body The Wilson Central Terminal is generated by the ADS1293 and is used as a reference to measure the chest electrode V1 The c...

Page 10: ...en calculating battery life A BLE device can go through several other modes such as receiving sleeping and waking up from sleep Even if the current consumption of a device in each different mode is known there is not enough information to determine the total power consumed by the device Each layer of the BLE stack requires a certain amount of processing to remain connected and to comply with the s...

Page 11: ... application is distributed manually there is a limit on how many devices can the application can be loaded on The UDID of each device needs to be provided before the application can be installed Use the following steps to install the Wireless Heart Rate Monitor application on a device 1 Connect the iPhone or iPad to the PC 2 Open the iTunes application on the PC 3 Wait for iTunes to identify that...

Page 12: ... the application ecgmonitor ipa 9 Open iTunes Once iTunes is open use the following steps to install the application on the device 1 Click the top left button in the iTunes interface shown in Figure 11 Figure 11 iTunes library 2 Once the top left button is clicked a menu appears click on Add File to Library see Figure 12 to navigate to and select the ecgmonitor ipa file from the file directory 12 ...

Page 13: ...m Getting Started Figure 12 Add File to Library 13 TIDU195A January 2014 Revised July 2014 Wireless Heart Rate Monitor Reference Design Submit Documentation Feedback Copyright 2014 Texas Instruments Incorporated ...

Page 14: ... Uninstall J3 4 Connect the ECG cable to the J1 connector on the ADS1293BLE board see Figure 14 Figure 14 Hardware Setup 5 Connect the five leads to either an ECG simulator or to five electrode pads attached to the body On the back of each lead is a label RL LL LA RA and V1 NOTE For the SKX2000 simulators connect V1 to the C1 terminal If using the SKX2000 simulator turn the simulator on and off by...

Page 15: ...ion on either an iPad or iPhone Figure 16 ECG Monitor Application Press the Start Scanning button as shown in Figure 17 Figure 17 Launch Application 15 TIDU195A January 2014 Revised July 2014 Wireless Heart Rate Monitor Reference Design Submit Documentation Feedback Copyright 2014 Texas Instruments Incorporated ...

Page 16: ...evice The three channel readings are now available on the screen If the board and ECG simulator are properly connected the screen will appear similar to Figure 19 or Figure 20 Figure 19 appears when connected to SKX2000 ECG Simulator Figure 19 ECG Data Connected to the Simulator Figure 20 appears when connected to the body Figure 20 ECG Data Connected to the Body 16 Wireless Heart Rate Monitor Ref...

Page 17: ...ws the complete attribute table for the ADS1293 ECG Demo Services are shown in yellow characteristics are shown in blue and characteristic values and descriptors are shown in grey The ADS1293 ECG demo implements a BLE peripheral device The Demo supports an ECG peripheral profile based on the heart rate example of the CC254x Simple BLE Peripheral frame work When configured by a peer device the ECG ...

Page 18: ...n 02 properties read only 19 00 handle 0x0019 39 2D UUID 0x2D39 0x19 0x2D39 ECG_SAMPLE_SETS 01 1 byte GATT_PERMIT_READ Number of ECG Sample Sets perpacket 0x1A 0x2901 GATT_CHAR_USER_DESC_UUID ECGSample Sets PerPacket 0 27 bytes GATT_PERMIT_READ Characteristic3 user description 08 properties write only 1C 00 handle 0x001C 3A 2D UUID 0x2D3A 0x1C 0x2D3A ECG_COMMAND 00 1 byte GATT_PERMIT_READ ECG comm...

Page 19: ...DC Middle byte 7 0xD6 ECG Sample1 Channel 2 ADC Low byte 8 0xD7 ECG Sample1 Channel 3 ADC High byte 9 0xD8 ECG Sample1 Channel 3 ADC Middle byte 10 0xD9 ECG Sample1 Channel 3 ADC Low byte 11 0xD1 ECG Sample2 Channel 1 ADC High byte 12 0xD2 ECG Sample2 Channel 1 ADC Middle byte 13 0xD3 ECG Sample2 Channel 1 ADC Low byte 14 0xD4 ECG Sample2 Channel 2 ADC High byte 15 0xD5 ECG Sample2 Channel 2 ADC M...

Page 20: ...of the development platforms for the CC2541 8051 microcontroller is the IAR development platform For information on this platform goto http www iar com To communicate to the development platform through IAR the CC Debugger is required as shown in Figure 23 The CC Debugger shown in Figure 23 must be connected to the 10 pin header on the SAT0015 board Ensure the notch on the cable that connects to t...

Page 21: ...wer as shown in Figure 25 Figure 25 Version Control Figure 26 shows the main entry function Figure 26 Main Function 21 TIDU195A January 2014 Revised July 2014 Wireless Heart Rate Monitor Reference Design Submit Documentation Feedback Copyright 2014 Texas Instruments Incorporated ...

Page 22: ...down completely before trying to reconnect To shut down the application hold the home button on the iPad or iPhone until the task manager window appears This window shows all of the applications running in the background Press and hold on the ADS1293 application until the X or symbol appears Click the X or to completely shut down the application Start again to reconnect the demo board If the issue...

Page 23: ...g data was simulated using the High Frequency Structural Simulator HFSS from ANSYS www ansys com The goal of the antenna simulations was to validate that the 2 45 GHz antenna performed as expected Figure 29 Antenna Simulation 6 2 Noise Test Results Figure 30 and Figure 31 show the input referred noise of the AFE Figure 30 Input Referred Noise Figure 31 Noise Histogram 23 TIDU195A January 2014 Revi...

Page 24: ... 50 Hz Signal 6 4 EMI Test Results of the ADS1293 Table 2 Test Results DUT Frequency MHz Vos_Off uV Vos_On uV Vrf_pp mV EMIRR 4L2 400 4 94 4 93 130 8 132 6231099 4L2 900 4 82 5 103 4 103 4341716 4L2 1800 5 05 4 98 90 109 2265398 4L2 2400 4 95 4 9 45 2 100 1849375 6L1 400 19 03 18 99 218 1 129 463827 6L1 900 19 18 97 225 6 132 5499389 6L1 1800 19 18 98 185 7 132 6906764 6L1 2400 19 01 18 99 41 9 10...

Page 25: ...ied with the following standards EN 300 328 FCC 15 247 IC RSS 210 EN 301 489 17 FCC and IC Regulatory Compliance standards FCC Federal Communications Commission Part 15 Class A IC Industry Canada ICES 003 Class A See the Gas Sensor Platform Reference Design SNOA922 for reference 25 TIDU195A January 2014 Revised July 2014 Wireless Heart Rate Monitor Reference Design Submit Documentation Feedback Co...

Page 26: ...10µF C22 47µF C21 2 1 5 3 4 6 U2 EG1390B VIN 1 FB 2 GND 3 VOUT 4 L 5 EN 6 U3 TPS61220DCK VDD_3 1 00Meg R16 200k R17 10µF C23 4 7µH L5 EPL3015 472MLB Schematics www ti com 7 Schematics Figure 36 Power Section 26 Wireless Heart Rate Monitor Reference Design TIDU195A January 2014 Revised July 2014 Submit Documentation Feedback Copyright 2014 Texas Instruments Incorporated ...

Page 27: ...L LL LA RA RA LA LL RL V1 1 2 4 096MHz Y1 ECS 41 18 5PXEN TR IN1 1 IN2 2 IN3 3 IN4 4 IN5 5 IN6 6 WCT 7 CMOUT 8 RLDOUT 9 RLDINV 10 RLDIN 11 RLDREF 12 SYNCB 13 VSSIO 14 ALARMB 15 CSB 16 SCLK 17 SDI 18 SDO 19 DRDYB 20 CLK 21 VDDIO 22 XTAL1 23 XTAL2 24 RSTB 25 CVREF 26 VSS 27 VDD 28 PAD U1 ADS1293CISQE NOPB 1 2 S1 PTS635SL50LFS www ti com Schematics Figure 37 Analog Front End 27 TIDU195A January 2014 ...

Page 28: ...N0S02D 2nH L4 LQG15HS2N0S02D 1 2 32 768kHz X1 ABS07 32 768KHZ 9 T 1 3 4 2 G G 32MHz X2 Q22FA1280009200 GND 1 SCL 2 SDA 3 NC 4 P1_5 5 P1_4 6 P1_3 7 P1_2 8 P1_1 9 DVDD2 10 P1_0 11 P0_7 12 P0_6 13 P0_5 14 P0_4 15 P0_3 16 P0_2 17 P0_1 18 P0_0 19 RESET_N 20 AVDD6 31 XOSC_Q1 22 XOSC_Q2 23 AVDD5 21 RF_P 25 RF_N 26 AVDD4 29 AVDD3 24 AVDD2 27 RBIAS 30 AVDD1 28 P2_4 32 P2_3 33 P2_2 34 P2_1 35 P2_0 36 P1_7 3...

Page 29: ... NP0 0402 0402 GRM1555C1H120JA01D MuRata C19 1 1000 pF CAP CERM 1000 pF 50 V 5 C0G NP0 0402 GRM1555C1H102JA01D MuRata 0402 C20 C25 C26 6 0 1 µF CAP CERM 0 1 µF 10 V 10 X7R 0402 0402 GRM155R71A104KA01D MuRata C27 C28 C30 C21 1 47 µF CAP CERM 47 µF 6 3 V 10 X5R 1206 1206 GRM31CR60J476KE19L MuRata C22 C23 2 10 µF CAP CERM 10 µF 6 3 V 20 X5R 0603 0603 GRM188R60J106ME47D MuRata C29 1 220 pF CAP CERM 22...

Page 30: ...1 3 01 Meg RES 3 01 MΩ 1 0 063 W 0402 0402 CRCW04023M01FKED Vishay Dale R23 1 56 2k RES 56 2k Ω 1 0 063 W 0402 0402 CRCW040256K2FKED Vishay Dale R24 1 2 21k RES 2 21k Ω 1 0 063 W 0402 0402 CRCW04022K21FKED Vishay Dale R32 1 10 Meg RES 10 MΩ 1 0 063 W 0402 0402 CRCW040210M0FKED Vishay Dale S1 S2 2 Switch tactile SPST NO 0 05 A 12V TH SW SPST 3 5 5 PTS635SL50LFS C K Components mm U1 1 ADS1293 low po...

Page 31: ...plots Figure 0 UNDEFINED Figure 0 UNDEFINED Figure 0 UNDEFINED Figure 0 UNDEFINED Figure 0 UNDEFINED Figure 0 UNDEFINED Figure 39 Layer Plot Figure 0 UNDEFINED Figure 0 UNDEFINED 31 TIDU195A January 2014 Revised July 2014 Wireless Heart Rate Monitor Reference Design Submit Documentation Feedback Copyright 2014 Texas Instruments Incorporated ...

Page 32: ...TIDA 00096 Figure 40 Figure 41 Figure 42 and Figure 43 show the layout Figure 40 All Layers Figure 41 Bottom Layer Figure 43 Top Layer Figure 42 Ground Layer 32 Wireless Heart Rate Monitor Reference Design TIDU195A January 2014 Revised July 2014 Submit Documentation Feedback Copyright 2014 Texas Instruments Incorporated ...

Page 33: ... the Gerber files for each board see the design files at TIDA 00096 Figure 44 Fab Drawing 33 TIDU195A January 2014 Revised July 2014 Wireless Heart Rate Monitor Reference Design Submit Documentation Feedback Copyright 2014 Texas Instruments Incorporated ...

Page 34: ...el design expertise Ajinder earned his Master of Science in Electrical Engineering MSEE from Texas Tech University in Lubbock TX Ajinder is a member of the Institute of Electrical and Electronics Engineers IEEE NATARAJAN VISWANATHAN also known as Vishy is an Applications Engineer at Texas Instruments Silicon Valley Analog where he is involved in developing embedded firmware evaluation tools and cu...

Page 35: ...h explaining that installation of application is manual but the designer must still connect to iTunes to install the application 11 NOTE Page numbers for previous revisions may differ from page numbers in the current version 35 TIDU195A January 2014 Revised July 2014 Revision History Submit Documentation Feedback Copyright 2014 Texas Instruments Incorporated ...

Page 36: ...ring the warranty period to the address designated by TI and that are determined by TI not to conform to such warranty If TI elects to repair or replace such EVM TI shall have a reasonable time to repair such EVM or provide replacements Repaired EVMs shall be warranted for the remainder of the original warranty period Replaced EVMs shall be warranted for a new full ninety 90 day warranty period 3 ...

Page 37: ...io 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 Concernant les EVMs avec antennes d...

Page 38: ... any load to the EVM output If there is uncertainty as to the load specification please contact a TI field representative During normal operation even with the inputs and outputs kept within the specified allowable ranges some circuit components may have elevated case temperatures These components include but are not limited to linear regulators switching transistors pass transistors current sense...

Page 39: ...F REMOVAL OR REINSTALLATION ANCILLARY COSTS TO THE PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES RETESTING OUTSIDE COMPUTER TIME LABOR COSTS LOSS OF GOODWILL LOSS OF PROFITS LOSS OF SAVINGS LOSS OF USE LOSS OF DATA OR BUSINESS INTERRUPTION NO CLAIM SUIT OR ACTION SHALL BE BROUGHT AGAINST TI MORE THAN ONE YEAR AFTER THE RELATED CAUSE OF ACTION HAS OCCURRED 8 2 Specific Limitations IN NO EVENT SHALL T...

Page 40: ...iconductor products are sold subject to TI s terms and conditions of sale supplied at the time of order acknowledgment TI warrants performance of its components to the specifications applicable at the time of sale in accordance with the warranty in TI s terms and conditions of sale of semiconductor products Testing and other quality control techniques for TI components are used to the extent TI de...

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