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RT1025 ECG/PPG AFE Cardioid Evaluation Board

EVB_RT1025WS_P0

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The RT1025 is an integrated AFE solution for Heart-Rate monitoring and measurements. The RT1025 integrates low noise voltage and current sensing channels and is capable of sensing ECG (Electrocardiography) and PPG (Photoplethysmography) simultaneously. The RT1025 has > 100dB dynamic range and can sense pulses accurately by detecting the heart’s electric signals. The sampling rates of the high-precision voltage and current sensing channels in the RT1025 are configurable between 64 to 4kHz. The RT1025 solution need only few discrete components and is easy to use for low-power medical ECG/PPG, sports, and fitness applications. With high levels of integration and high-precision voltage and current sensing channels, the RT1025 solution is suitable for scalable medical instrumentation systems. The RT1025 is available in a 3.1mm x 3.4mm, 41-Ball, 0.4mm pitch, WL-CSP package.
The Cardioid evaluation board (Cardioid Pad) was developed full function with with Android APP to evaluate the RT1025 performance. The evaluation board includes the RT1025 together with the BLE SiP and PPG modules to quickly evaluate the operation and performance of the RT1025. The detail schematic, hardware and bench measure procedure will be described in the following section. The evaluation board number is PCB106_V1 and the dimensions are 9cm x 5cm.

Purpose

The RT1025 is an integrated AFE solution for Heart-Rate monitoring and Biopotential measurements. The RT1025 integrates low noise voltage and current sensing channels and is capable of sensing ECG (Electrocardiography) and PPG (Photoplethysmography) simultaneously. Richtek Technology developed an evaluation board with Android APP to evaluate the RT1025 performance. This document describes the operation manual of the RT1025 evaluation board. It includes the schematic, hardware and bench measure procedure.


Introduction

General Product Information

The RT1025 is an integrated AFE solution for Heart-Rate monitoring and measurements. The RT1025 integrates low noise voltage and current sensing channels and is capable of sensing ECG (Electrocardiography) and PPG (Photoplethysmography) simultaneously. The RT1025 has > 100dB dynamic range and can sense pulses accurately by detecting the heart’s electric signals. The sampling rates of the high-precision voltage and current sensing channels in the RT1025 are configurable between 64 to 4kHz. The RT1025 solution need only few discrete components and is easy to use for low-power medical ECG/PPG, sports, and fitness applications. With high levels of integration and high-precision voltage and current sensing channels, the RT1025 solution is suitable for scalable medical instrumentation systems. The RT1025 is available in a 3.1mm x 3.4mm, 41-Ball, 0.4mm pitch, WL-CSP package.

The Cardioid evaluation board (Cardioid Pad) was developed full function with with Android APP to evaluate the RT1025 performance. The evaluation board includes the RT1025 together with the BLE SiP and PPG modules to quickly evaluate the operation and performance of the RT1025. The detail schematic, hardware and bench measure procedure will be described in the following section. The evaluation board number is PCB106_V1 and the dimensions are 9cm x 5cm.


Product Feature

  • Evaluation Board Features
  • ► Evaluation Board Number : PCB106_V1
    ► Dimension : 9cm x 5cm
  • ECG Channel Feature
  • ► 3 PCB ECG Electrodes
    ► Ear phone Jack for 3 ECG Electrodes
    ► Low Input-Referred Noise : 0.67µVrms (64Hz ODR, Gain = 12)
    ► Dynamic Range : 110dB at Gain = 6
    ► CMRR > 85dB at 60Hz
    ► Data rate : 64SPS to 4k SPS
  • PPG Channel Features
  • ► G/Red/IR LED with PD Module
    ► Boost Supply for Green LED
    ► TX LED Current Range : 10 / 25 / 35 / 50 / 65 / 75 / 90 / 105mA, Each with 8-bit Current Resolution
    ► Input-Referred Noise : 50pArms at 5µA Input Current
    ► CMRR > 80dB at 60Hz
    ► PGA Gain : 1 to 6V/V
  • Others
  • ► Connect with “Cardio EVK” Android APP
    ► Programmable BLE SiP
    ► I2C interface for display panel
    ► USB Micro-B interface for Lithium-Ion Battery Charging
    ► Operating Temperature Range : –20°C to 65°C
    ► RoHS Compliant and Pb Free

Key Performance Summary Table

Key Features

Evaluation Board Number : PCB106_V1

PCB Battery Supply Voltage

3.6V (LIR2430)

PCB Battery Charging Voltage

5V via Micro USB connector

Current Consumption (Idle)

136µA

Current Consumption (BLE Advertising)

220µA

Current Consumption (BLE Connecting)

350µA

Current Consumption (Measuring)

8mA to 19mA (Depend on PPG measuring current setting)

Default Marking & Package Type

RT1025WS, WL-CSP-41B 3.10x3.48 (BS)

  • Note that EVB_RT1025WS_P0 kit does not include LIR2430 battery due to transport regulations.
  • LIR2430 is a rechargeable Lithium Coin Cell 3.6V, capacity 80mAh.


Bench Test Setup Conditions

Headers Description and Placement

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Carefully inspect all the components used in the EVB according to the following Bill of Materials table, and then make sure all the components are undamaged and correctly installed. If there is any missing or damaged component, which may have occurred during transportation, please contact our distributors or e-mail us at evb_service@richtek.com.



Test Points

The EVB is provided with the connecter interfaces and pin names listed in the table below.

Test point/

Pin name

Signal

Comment (expected waveforms or voltage levels on test points)

VRLD

Output voltage

ECG RLD output.

FR / FL

ECG Input

Fingers contact for differential ECG input.

JP2

OLED Display Interface

(Option for display development)

JP2-1

DVDD33

Display supply voltage 3.3V.

JP2-2

DGND

Display ground.

JP2-3

G_SCL

Display I2C data pin.

JP2-4

G_SDA

Display I2C clock pin.

JP4

EVB Interface

Cardioid evaluation board Interface.

JP4-1

DVDD_SYS

MCU supply voltage 3.3V.

JP4-2

VPPG0_EN

PPG R/IR LED select.

JP4-3

EXT_Control

Bypass MCU on EVB (High : Bypass, Floating : Default)

JP4-4

VPPG1_EN

PPG R/IR LED select.

JP4-5

E_RSTB

RT1025 ECG/PPG AFE RSTB.

JP4-6

VBST_EN

PPG Gn LED select.

JP4-7

E_PWD

RT1025 ECG/PPG AFE RWD.

JP4-8

LDO_EN

RT5707 DVDD18 enable.

JP4-9

E_INT

RT1025 ECG/PPG AFE INT.

JP4-10

CHG_N

RT9527 Charger CHG_N.

JP4-11

E_CSN

RT1025 ECG/PPG AFE SPI data pin.

JP4-12

G_INT2

RT3001 G-sensor INT2.

JP4-13

E_CLK

RT1025 ECG/PPG AFE SPI clock pin.

JP4-14

G_INT

RT3001 G-sensor INT1.

JP4-15

E_MOSI

RT1025 ECG/PPG AFE SPI serial in master out.

JP4-16

G_SDA

RT3001 G-sensor I2C data pin.

JP4-17

E_MISO

RT1025 ECG/PPG AFE SPI serial out master in.

JP4-18

G_SCL

RT3001 G-sensor I2C clock pin.

JP4-19

DGND

Ground.

JP4-20

DGND

Ground.

CON5

ECG Input

JACK Phone input for ECG patch.

CON5-1

VRLD_CON

ECG RLD output.

CON5-2,

CON5-5

NC

No internal connection.

CON5-3

FR

ECG right signal input.

CON5-4

FL

ECG left signal input.

SWD_B

SWD debug pins

MCU SWD debug pins.

SWD_B-1

DVDD33

MCU power pin 3.3V.

SWD_B-2

SWDIO

MCU SWD IO pins.

SWD_B-3

SWCLK

MCU SWD clock pins.

SWD_B-4

RESETN

MCU SWD reset pins.

SWD_B-5

DGND

Ground.

USB3

USB Charger Interface

USB Micro-B for charger interface.

USB3-1

VBUS

RT9527 charger IC input.

USB3-2

D-

No internal connection.

USB3-3

D+

No internal connection.

USB3-4

ID

No internal connection.

USB3-5

GND

Ground.



Measurement Procedure

The RT1025 supports the reading of samples and device status upon interrupt or via polling. It contains 4kB SRAM for data buffering. The device is internally clocked to offer high-precision clock with external crystal. The flexible timing control enable the users to control the PPG device timing for different application and to power down the device for power saving. In order to achieve the high speed data acquisition, the RT1025 device was configured as a slave of SPI mode. The Cardioid evaluation board is fully assembled and tested. The usage of the evaluation board was shown in below figure.

1. Insert LIR2430 Battery in the battery case. The battery can be charged by applying 5V via the Micro USB port.

  • Once on, you should see a Red LED lighting for OK status
  • If no light is present, check connections or try replacing the Battery with a fresh one.
  • If Red LED is flashing, check the I2C or SPI device correct connections.

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2. Make sure the evaluation board connect to the Android APP for ECG/PPG measurement

  • Make sure Bluetooth is enabled on the phone/tablet.
  • Launch the “Cardio EVK” application on your phone/tablet.

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  • Then, you will need to connect to the Cardioid evaluation board Hardware. Do this by selecting the “BLE ICON” that shows up upon opening the android application. Select the evaluation board ID (RTK_CARDIO_00XXXX) from pup-out menu for BLE paring.

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  • After the Cardioid evaluation board BLE connection is successfully established, the “BLE ICON” will become blue and the main GUI will launch.

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3. Put your fingers cover the VRLD and PPG sensor in the top, FR/FL in the bottom.

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4. Select “PPG+ECG“ tab firstly, then press “Measure” to start PPG+ECG data acquisitions. Note that it may take a while to get stable results. Press “Stop”, once you finish the measurement.

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5. Check the measurement results. Press “SAVE” to store the measured data for analysis. Or “LOAD” to load the saved waveform.

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Please refer to the document APP_RT1025WS_P0-00 for more information about the Android APP.


Typical Application Circuit

Using Cardioid evaluation board for ECG/PPG Sensing

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Schematic, Bill of Materials & Board Layout

EVB Schematic Diagram

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Bill of Materials

Reference

Qty

Part number

Description

Package

Manufacturer

BAT1

1

BT-BS-24-A1AJ001

SIP-2P

CR2430

HUAI YANG

CON5

1

EJ-3699M-GP

JACK_CON/5P/EJ-3699M-GP

AUDIOJACK/5P/SMD/EJ-3699M-GP

Dian Jin

C3, C11, C12

3

C1005X7R1H104K050BB

100nF/50V/X7R

C-0402

TDK

C5

1

C1005X5R1A475KT

4.7µF/6.3V/X7R

C-0402

TDK

C8, C17, C22, C24, C26, C30, C97, C104, C105, C106

10

C1005X5R0J105K050BB

1µF/6.3V/X5R

C-0402

TDK

C13, C15

2

GRM1555C1H220FZ01D

22pF/NPO

C-0402

Murata

C16, C18, C21, C23

4

GRM155R61E225KE11D

2.2µF/6.3V/X5R

C-0402

Murata

C19, C25

2

0402N330J500CT

33pF/6.3V/X7R

C-0402

WALSIN

C20

1

0402B331K100

330pF/6.3V/X7R

C-0402

WALSIN

C98, C99, C101, C102

4

GRM188R60J226MEA0D

22µF/6.3V/X5R

C-0603

Murata

C107, C108, C109, C110, C111, C112, C113, C114

8

0402X106M100CT

10µF/6.3V/X5R

C-0402

WALSIN

D1

1

LNL-191SUR

Red LED

LED_2P_RT1025

LIGH TOP

D2

1

LNL-190UB

Blue LED

LED_2P_RT1025

LIGH TOP

D3

1

LNL-190UW-4H

White LED

LED_2P_RT1025

LIGH TOP

ESD1, ESD2, ESD3

3

ESD/D5V0L1B2S9-7

ESD

R-0603

DIODES

L1, L2

2

DFE201610E-2R2M=P2

2.2µH/1239AS-H-2R2M/2520

L-2-5X2-0

MuRata

NTC1

1

NCP15XH103F03RC

NCP15X1-H103F03RC

R-0402

MuRata

PL1, PL2, PL3

3

WR06X000 PTL

0

L-0603

WALSIN

PL4

1

GBLM160808P-1R5M

PL/GBLM160808P-1R5M

L-NR3015

GOTREND

R1

1

CR-02FL6---12K

12k/1%

R-0402

Viking

R4, R15

2

WR04X1001FTL

1k/1%

R-0402

WALSIN

R5

1

WR04X6802FTL

68k/1%

R-0402

WALSIN

R7, R23, R174, R201, R202, R203, R221, R223, R225, R226, R227, R230, R231, R233, R234

15

WR04X000 PTL

0/1%

R-0402

WALSIN

R8, R9

2

CR-02FL6---4K7

4.7k/1%

R-0402

Viking

R11, R198, R228

3

WR04X1002FTL

10k/1%

R-0402

WALSIN

R12, R13, R14, R26, R79, R80, R206, R207, R209, R211, R213, R214, R215, R217, R220, R235

16

WR02X1003FTL

100k/1%

R-0201

WALSIN

R17, R18

2

WR04X6202FTL

62k/1%

R-0402

WALSIN

R19

1

WR04X1004FTL

1M/1%

R-0402

WALSIN

R20

1

WR04X1503FTL

150k/1%

R-0402

WALSIN

R78

1

WR06X8063FTL

806k/1%

R-0402

WALSIN

R204

1

WR06X000 PTL

0R

R-0603

WALSIN

SW1

1

HTS 6601H

TOUCH-BTN

DIP-4P

High-Tronics

USB3

1

UMMBF-051MGCB9-CF1066

USB Micro-B Connector

USB Micro-B

Cherng Weei

U2

1

NT1613A-NQA-30-BJ

Battery Protect IC

QFN2X3_8L_0-5

Neotek

U3

1

RT9527GQW

Charger IC

WDFN-8L 2x2

Richtek

U6

1

BGM11S22F256GA

BLE SiP

BGM11S22F256GA

SiLab

U7

1

RT1025WS

ECG/PPG AFE IC

WL-CSP-41B 3.10x3.48 (BS)

Richtek

U8

1

RT3001GQL

G-sensor

LGA-12L 2x2

Richtek

U12

1

SFH7050

PPG LED & PD Module

SFH7050

OSRAM

U14

1

RT4813AGQUF

4.5V Boost IC

UQFN-9L 2x2 (FC)

Richtek

U15

1

RT9073A-33GQZ

3.3V LDO

ZQFN-4L 1x1

Richtek

U16, U17

2

RT5707WSC

1.8V/2.8V Buck IC

WL-CSP-8B 0.9x1.6 (BSC)

Richtek

X1

1

DST-310S

32.768kHz/TFX-02S-32

CRY-DST310S

HARMONY



PCB Layout

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Top View (1st layer)

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PCB Layout—Inner Side (2nd Layer)

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PCB Layout—Inner Side (3rd Layer)

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Bottom View (4th Layer)

Title Last Update Share Download
Evaluation Board User Guide 2018/11/15
Bill of Materials 2018/11/15
Gerber File 2018/09/27
Schematic 2018/09/27
Evaluation Board Design Notice 2018/09/27
Cardio EVK User Manual 2018/11/09
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