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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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Table of Contents

SBAU370 – APRIL 2021

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AFE4500 EVM User Guide 1