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3.2 Clock

AFE4500 can be clocked using the internal oscillator (128 KHz) or through an external clock of 32.768 KHz from
the Y1 oscillator.

3.3 Accessing AFE4500 Digital Signals

The digital signals of the AFE that interface with the MSP430 can be accessed through the test 24 pin dual row
connector.

Figure 3-2. Digital signals

www.ti.com

AFE4500 EVM Hardware

SBAU370 – APRIL 2021

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AFE4500 EVM User Guide

17

Copyright © 2021 Texas Instruments Incorporated

Содержание AFE4500EVM

Страница 1: ...16 3 2 Clock 17 3 3 Accessing AFE4500 Digital Signals 17 3 4 Interfacing the MSP430 on the EVM to an AFE4500 on a Different Board 18 3 5 To Interface an MCU on a Different Board with the AFE of EVM 18...

Страница 2: ...ll as a utility to load the firmware into EVM USB_Driver_Vx zip Latest USB driver for the EVM 1 1 AFE4500 EVM Kit Contents 1 AFE4500 EVM Demonstration Kit 2 IMP JIG CLOSED Plugin Board for BIA 3 IMP J...

Страница 3: ...USB COM ports are not detected when the EVM is connected to PC If the PC already has EVM software installed for previous AFEs i e EVM gets detected as AFE44xx EVM its driver has to be un installed and...

Страница 4: ...io Sensing AFE4500EVM EVM Firmware AFE4500 V1 1 0 txt 3 Press the switch named BSL on the EVM while plugging in the micro USB interface cable on the EVM 4 Release the BSL switch when the application d...

Страница 5: ...13 J7 SH J14 J8 SH J15 J7 2 3 SH J16 J11 SH J17 J10 SH J18 J1 11 12 SH J19 J1 23 24 2 Connect the EVM to PC using USB micro cable provided along with the EVM as shown in Figure 1 4 Figure 1 4 Connecti...

Страница 6: ...e connector board Figure 1 6 Connecting the ECG cables to the EVM 5 Place the sensor side of the PPG sensor board on the wrist and tie it snugly Figure 1 7 shows the sensor board being held with a Vel...

Страница 7: ...devInit py script file and run Short cut for running the script F5 as shown in Figure 1 9 which loads the default EVM configuration This will open a GUI window as shown in Figure 1 9 which has the ca...

Страница 8: ...Figure 1 9 Running the EVM software AFE4500 EVM Evaluation www ti com 8 AFE4500 EVM User Guide SBAU370 APRIL 2021 Submit Document Feedback Copyright 2021 Texas Instruments Incorporated...

Страница 9: ...l the controls required for the EVM evaluation as shown in Figure 2 3 1 INFORMATION Product Safety warnings Restrictions and Disclaimers 2 GLOBAL SETTINGS This page has controls to import the register...

Страница 10: ...ation files are created using the excel register generation tool Select AFE4500_Settings cfg and click Open as shown in Figure 2 4 Wait for the loading to complete and reach 100 After loading is compl...

Страница 11: ...EVM GUI 2 Plot Controls Configure the data to be plotted Follow the steps below see Figure 2 6 Click on the Refresh List The Data to Plot drop down will list all the different signals that can be vis...

Страница 12: ...ly uncheck the Power Spectrum FFT Adding a new plot changes all the plots to time domain Right click on plots also gives options regarding axis such as auto scale Auto scale shortcut is A Figure 2 7 C...

Страница 13: ...ormat whereas other information gets exported as cfg file The exported configuration file can be later imported to configure the AFE into state same as prior to export Figure 2 9 Exporting captured da...

Страница 14: ...egister settings to be loaded to the AFE4500 Once completed Import Completed status will come in the status bar below the GUI Figure 2 11 Loading closed electrode configuration Select the DATA that ne...

Страница 15: ...menu Select the signal source to be plotted and start capture as shown in Figure 2 13 Figure 2 13 Selecting data to be plotted and stating capture www ti com EVM Software SBAU370 APRIL 2021 Submit Do...

Страница 16: ...is configured to LDO enable mode with RX_SUP IO_SUP 3 3 V and TX_SUP 5V There is an option to configure the EVM in LDO Bypass mode where RX_SUP IO_SUP 1 8 V and TX_SUP 5 V By default the power for the...

Страница 17: ...r 3 3 Accessing AFE4500 Digital Signals The digital signals of the AFE that interface with the MSP430 can be accessed through the test 24 pin dual row connector Figure 3 2 Digital signals www ti com A...

Страница 18: ...ernal AFE4500 and the EVM are matched or tap them from the EVM Figure 3 3 Test points 3 5 To Interface an MCU on a Different Board with the AFE of EVM To interface an MCU on a different board with the...

Страница 19: ...the AFE4500 BSL This switch is used to enable boot strap loader BSL MSP430 firmware 1 1 To enable BSL disconnect device and then reconnect while holding down BSL switch The device will appear as an HI...

Страница 20: ...ctor Pinouts Table 4 1 USB Micro Connector Pinout Descriptions Pin Number Pin Name Pin Description 1 VBUS USB power 5 V 2 D USB DM 3 D USB DP 4 ID NC 5 GND GND 4 2 10 Pin PPG Connector The 10 pin conn...

Страница 21: ...Power Supply for LEDs 2 TX1 GREEN LED2 3 TX2 RED LED 4 TX3 IR LED 5 TX6 GREEN LED1 6 GND Ground 7 INM3 IR CUT anode 8 INP3 IRCUT cathode 9 INM4 Broadband PD anode 10 INP4 Broadband PD cathode Table 4...

Страница 22: ...he BIA and ECG demonstration boards need to be interface to this connector Figure 4 3 10 pin PPG sensor board interface connector pinout Connector Interface www ti com 22 AFE4500 EVM User Guide SBAU37...

Страница 23: ...Hz ECG INA Gain 21 The register generation excel has different worksheets for configuring the AFE The various worksheets in this file are described below 1 PPG Configuration Phase Definition Device C...

Страница 24: ...rows in sequence from top to bottom Fill only the parameters that show up in the Blue boxes Manually fill each cell using the drop down boxes do not cut and paste values across cells Do not modify the...

Страница 25: ...is provided along with the installer The pre configured high frequency BIA configuration tool is placed at C Program Files Texas Instruments Bio www ti com AFE4500 Register Generation Excel SBAU370 A...

Страница 26: ...5 4 BIA Configuration 5 4 Mix configuration If the acquisition mode selected is MIX1 MIX2 the MIX_Config worksheet needs to be configured The PRF time slot related settings decimation filter settings...

Страница 27: ...enerated using the excel will be in the same directory as the excel file AFE4500_Settings cfg Register configuration in the format required for the EVM AFE4500_Settings_mcu cfg Register configuration...

Страница 28: ...xtension of the file should be py 6 2 Writing a script to configure the device and the capture data 6 2 1 Resetting all the previous settings Which might include Stopping the capture incase if the cap...

Страница 29: ...ng back the modified value to register 0x42 6 2 3 Writing and Reading from bit fields using the bitfield names mentioned in datasheet Open the Register Settings tab in the GUI and find the register bi...

Страница 30: ...cript shows capturing the data for 10 seconds stopping it and then accessing the captured data Modifying or Creating Own Script www ti com 30 AFE4500 EVM User Guide SBAU370 APRIL 2021 Submit Document...

Страница 31: ...ough Figure A 6 show the EVM schematics Figure A 1 AFE4500 Schematic 1 of 6 Figure A 2 AFE4500 Schematic 2 of 6 www ti com Hardware Reference SBAU370 APRIL 2021 Submit Document Feedback AFE4500 EVM Us...

Страница 32: ...3 AFE4500 Schematic 3 of 6 Figure A 4 AFE4500 Schematic 4 of 6 Hardware Reference www ti com 32 AFE4500 EVM User Guide SBAU370 APRIL 2021 Submit Document Feedback Copyright 2021 Texas Instruments Inco...

Страница 33: ...5 AFE4500 Schematic 5 of 6 Figure A 6 AFE4500 Schematic 6 of 6 www ti com Hardware Reference SBAU370 APRIL 2021 Submit Document Feedback AFE4500 EVM User Guide 33 Copyright 2021 Texas Instruments Inco...

Страница 34: ...h Figure A 12 show the PCB Layout Recommendations Figure A 7 AFE4500 PCB Layout Recommendation 1 of 11 Hardware Reference www ti com 34 AFE4500 EVM User Guide SBAU370 APRIL 2021 Submit Document Feedba...

Страница 35: ...Figure A 8 AFE4500 PCB Layout Recommendation 2 of 11 www ti com Hardware Reference SBAU370 APRIL 2021 Submit Document Feedback AFE4500 EVM User Guide 35 Copyright 2021 Texas Instruments Incorporated...

Страница 36: ...Figure A 9 AFE4500 PCB Layout Recommendation 3 of 11 Hardware Reference www ti com 36 AFE4500 EVM User Guide SBAU370 APRIL 2021 Submit Document Feedback Copyright 2021 Texas Instruments Incorporated...

Страница 37: ...Figure A 10 AFE4500 PCB Layout Recommendation 4 of 11 www ti com Hardware Reference SBAU370 APRIL 2021 Submit Document Feedback AFE4500 EVM User Guide 37 Copyright 2021 Texas Instruments Incorporated...

Страница 38: ...Figure A 11 AFE4500 PCB Layout Recommendation 5 of 11 Hardware Reference www ti com 38 AFE4500 EVM User Guide SBAU370 APRIL 2021 Submit Document Feedback Copyright 2021 Texas Instruments Incorporated...

Страница 39: ...Figure A 12 AFE4500 PCB Layout Recommendation 6 of 11 www ti com Hardware Reference SBAU370 APRIL 2021 Submit Document Feedback AFE4500 EVM User Guide 39 Copyright 2021 Texas Instruments Incorporated...

Страница 40: ...anics C11 C12 C17 C18 C24 C25 C40 C41 C42 C45 C52 11 10uF CAP CERM 10 F 10 V 20 X5R 0402 0402 0402ZD106MAT2A AVX C15 C16 C19 C23 C26 C27 C28 C29 C30 C31 C32 C33 C34 C38 C39 C43 C44 C46 C47 C49 C50 C51...

Страница 41: ...output and some BOM reports ECG PRO 3 WAY CABLE Olimex J1 1 Header 100mil 12x2 Gold TH 12x2 Header TSW 112 07 G D Samtec J2 1 Header 2 54mm 10x1 Tin R A TH Header 2 54mm 10x1 R A TH TSW 110 08 T S RA...

Страница 42: ...k 1 0 05 W 0201 0201 CRCW020120K0F KED Vishay Dale R14 1 768k RES 768 k 1 0 05 W 0201 0201 RC0201FR 07768 KL Yageo America R15 1 180k RES 180 k 1 0 05 W 0201 0201 RC0201FR 07180 KL Yageo America R16 R...

Страница 43: ...ance Analysis DSBGA42 AFE4500YBGR Texas Instruments U2 1 1 uA IQ 200 mA Ultralow IQ Low Dropout Regulator DQN0004A X2SON 4 DQN0004A TPS7A0233PDQN R Texas Instruments Texas Instruments U3 1 3 5MHz 1 5A...

Страница 44: ...RLR Texas Instruments U13 1 SOIC8 ISO1640BDR Texas Instruments U14 1 TCA9406 Dual Bidirectional 1 MHz I2C BUS and SMBus Voltage Level Translator 1 65 to 3 6 V 40 to 85 degC 8 pin DSBGA YZP Green RoHS...

Страница 45: ...18 FID19 FID20 FID21 FID22 FID23 FID24 0 Fiducial mark There is nothing to buy or mount N A N A N A J14 0 Footprint for Tag Connect TC2050 cables There is nothing to buy or mount Footprint for TC2050...

Страница 46: ...evisions may differ from page numbers in the current version DATE REVISION NOTES April 2021 Initial Release Revision History www ti com 46 AFE4500 EVM User Guide SBAU370 APRIL 2021 Submit Document Fee...

Страница 47: ...ther than TI b the nonconformity resulted from User s design specifications or instructions for such EVMs or improper system design or c User has not paid on time Testing and other quality control tec...

Страница 48: ...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 in...

Страница 49: ...instructions set forth by Radio Law of Japan which includes but is not limited to the instructions below with respect to EVMs which for the avoidance of doubt are stated strictly for convenience and s...

Страница 50: ...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 electr...

Страница 51: ...R DAMAGES ARE CLAIMED THE EXISTENCE OF MORE THAN ONE CLAIM SHALL NOT ENLARGE OR EXTEND THIS LIMIT 9 Return Policy Except as otherwise provided TI does not offer any refunds returns or exchanges Furthe...

Страница 52: ...are subject to change without notice TI grants you permission to use these resources only for development of an application that uses the TI products described in the resource Other reproduction and...

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