Texas Instruments AFE4500EVM, User Manual

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User’s Guide
AFE4500 EVM User Guide
ABSTRACT
This user guide describes the operation of the AFE4500 EVM demonstration kit. This demonstration kit is
an evaluation module for the AFE4500 device. The AFE4500 is a fully-Integrated AFE for Wearable Optical
Heart-Rate Monitoring, SpO2, ECG and BIA. The EVM is intended for evaluation of the AFE features. This
document also describes the steps for generating the AFE4500 register configuration files using the provided
Excel tool for different operating conditions.
Table of Contents
1 AFE4500 EVM Evaluation ....................................................................................................................................................... 2
1.1 AFE4500 EVM Kit Contents............................................................................................................................................... 2
1.2 Install the PC application EVM Software............................................................................................................................ 3
1.3 Install the USB driver......................................................................................................................................................... 3
1.4 EVM Firmware Upgrade..................................................................................................................................................... 4
1.5 Setup the Hardware........................................................................................................................................................... 5
2 EVM Software .......................................................................................................................................................................... 9
2.1 Import AFE Register Configuration.................................................................................................................................. 10
2.2 Capturing the AFE data and Plotting................................................................................................................................ 11
3 AFE4500 EVM Hardware ..................................................................................................................................................... 16
3.1 Power Supply................................................................................................................................................................... 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
3.6 USB Interface................................................................................................................................................................... 19
3.7 On-Board Key Interface................................................................................................................................................... 19
3.8 Visual Indication............................................................................................................................................................... 19
4 Connector Interface .............................................................................................................................................................. 20
4.1 Micro-USB Connector...................................................................................................................................................... 20
4.2 10-Pin PPG Connector..................................................................................................................................................... 20
4.3 10-Pin BIA+ECG Connector ............................................................................................................................................ 22
5 AFE4500 Register Generation Excel ................................................................................................................................... 23
5.1 PPG Configuration........................................................................................................................................................... 23
5.2 ECG-Configuration........................................................................................................................................................... 24
5.3 BIA-Configuration............................................................................................................................................................. 25
5.4 Mix configuration.............................................................................................................................................................. 26
5.5 Generate the Output Files................................................................................................................................................ 27
6 Modifying or Creating Own Script ....................................................................................................................................... 28
6.1 Adding a new script file.................................................................................................................................................... 28
6.2 Writing a script to configure the device and the capture data.......................................................................................... 28
A Hardware Reference ............................................................................................................................................................ 31
A.1 AFE4500 Schematics...................................................................................................................................................... 31
A.2 PCB Layout Recommendations....................................................................................................................................... 34
A.3 AFE4500 Bill of Materials................................................................................................................................................ 40
B Revision History ................................................................................................................................................................... 46
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SBAU370 – APRIL 2021
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