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RT1025 ECG/PPG AFE Daughter Board

EVB_RT1025WS_D0

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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 have > 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 4 kHz. 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 daughter board (DTB) was developed to bring out alls of RT1025 pins to DIP pins. The daughter board includes the RT1025 together with the required 32kHz Xtal and the passive components 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 daughter board number is PCB107_V1 and the dimensions are 3.3cm x 3.3cm.

Purpose

The RT1025 is an integrated SOC solution for Heart-Rate monitoring and Biopotential measurements. The RT1025 integrate low noise voltage and current sensing channels and is capable of sensing ECG(Electrocardiography) and PPG(Photoplethysmography) simultaneously. Richtek Technology develops a daughter board (DTB) to evaluate RT1025 performance. This document describes the operation manual of RT1025 daughter 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 have > 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 4 kHz. 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 daughter board (DTB) was developed to bring out alls of RT1025 pins to DIP pins. The daughter board includes the RT1025 together with the required 32kHz Xtal and the passive components 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 daughter board number is PCB107_V1 and the dimensions are 3.3cm x 3.3cm.


Product Feature

  • Daughter Board Feature
  • ► Evaluation Board Number : PCB107_V1
    ► Dimension : 3.3cm x 3.3cm
    ► 32 DIP Pins
  • ECG Channel Feature
  • ► Supports Two-Electrode (2E) Mode and Right Leg Drive (RLD) Mode
    ► Low Noise PGA and High Resolution ADC
    ► Input Impedance : 125M to 500MΩ at Two-Electrode Mode and > 1GΩ at Right Leg Drive Mode
    ► 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 Feature
  • ► Flexible Timing Control and Support Dynamic Power Down
    ► TX Supports H-bridge and Push/Pull Mode
    ► TX LED Current Range : 10 / 25 / 35 / 50 / 65 / 75 / 90 / 105mA, Each with 8-bit Current Resolution
    ► Input Maximum Current Range : 0.5 to 50µA
    ► Input Maximum Capacitance : 1nF
    ► Input-Referred Noise : 50pArms at 5µA Input Current
    ► CMRR > 80dB at 60Hz
    ► PGA Gain : 1 to 6V/V
    ► Ambient DAC1/DAC2 Range : 1 to 6µA
  • Others
  • ► 2-in-1 Bio-Sensing AFE (Voltage/Current)
    ► Built-In Heartbeat Interval Estimation
    ► Integrates an Oscillator to offer High-Precision Clock with External Crystal
    ► Support I2C and SPI I/F for MCU
    ► On-Chip SRAM for Data Buffering
    ► Ultra-Low Power Consumption
    ► Operating Temperature Range : –20°C to 65°C
    ► Small 3.1mm x 3.4mm, 41-Ball, 0.4mm Pitch, and WL-CSP Package
    ► RoHS Compliant and Halogen Free

Key Performance Summary Table

Key Features

Evaluation Board Number : PCB107_V1

Analog Supply Voltage

2.8V

Digital Supply Voltage

1.8V

I/O Supply Voltage

1.8V to 3.3V

Current Consumption (Idle)

< 7µA

Current Consumption (ECG)

570µA

Current Consumption (PPG)

530µA

Default Marking & Package Type

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



Bench Test Setup Conditions

Headers Description and Placement

Technical Document Image Preview

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 occur 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

Comment (expected waveforms or voltage levels on test points)

JP1-1

GND

Ground.

JP1-2

SPI_MISO

SPI serial out master in.

JP1-3

SPI_MOSl

SPI serial in master out.

JP1-4

SPI_CLK / SCL

1. SPI mode : SPI clock pin. (SPI_CLK)

2. I2C mode : I2C clock pin. (I2C_SCL)

JP1-5

SPI_CSN / SDA

1. SPI mode : SPI data pin. (SPI_CSN)

2. I2C mode : I2C data pin. (I2C_SDA)

JP1-6

DVDDIO

Digital IO supply.

JP1-7

I2C_SEL

1. SPI mode : please keep I2C_SEL low.

2. I2C mode : please keep I2C_SEL high.

JP1-8

GND

Ground.

JP2-1

TMODE

Leave floating. (Connect to Ground on EVB)

JP2-2, JP2-3, JP2-4

RSV3, RSV4, RSV

Reserve for testing. (Leave floating)

JP2-5

VRLD

RLD output. (Leave floating at 2E mode)

JP2-6

VCM

PPG input common mode voltage. (Leave floating)

JP2-7

VIN_EKG

INN_ECG Pin for ECG IA negative input.

JP2-8

VIP_EKG

INP_ECG Pin for ECG IA positive input.

JP3-1

RESETB

Reset pin.

JP3-2

AFE_PWD

Power down pin.

JP3-3

INT

Interrupt pin.

JP3-4

DVDD18

Digital supply.

JP3-5

AVDD28

Analog supply.

JP3-6

AVDD_HV

PPG LED driver power.

JP3-7, JP3-8

RSV6, RSV7

Reserve for testing. (leave floating)

JP4-1

TX2_PPG

TX2 pin for LED driver output.

JP4-2

TX1_PPG

TX1 pin for LED driver output.

JP4-3

GND

Ground.

JP4-4

VIP_PPG

INP_PPG Pin for PPG receiver input pin.

JP4-5

VIN_PPG

INN_PPG Pin for PPG receiver input pin.

JP4-6, JP4-7, JP4-8

RSV2, RSV5, RSV1

Reserve for testing. (Leave floating)



Measurement Procedure

The RT1025 daughter board is fully assembled and tested. The daughter board brings out all I/O pins of the RT1025 for easily evaluate the IC performance and development.


Typical Applicatin Circuite

Using daughter board for ECG/PPG Sensing

Technical Document Image Preview



Schematic, Bill of Materials & Board Layout

EVB Schematic Diagram

Technical Document Image Preview



Bill of Materials

Reference

Qty

Part Number

Description

Package

Manufacturer

C1, C2

2

0603N220J500CT

22pF/50V/NPO

C-0603

WALSIN

C3

1

C1608X7R1H104K080AA

100nF/50V/X7R

C-0603

TDK

C4, C7, C8, C9

4

0603X225K160CT

2.2µF/16V/X5R

C-0603

WALSIN

C5, C6

2

0603B472K500CT

4.7nF/50V/X7R

C-0603

WALSIN

C10

1

C1608X5R1E105K080AC

1µF/25V/X5R

C-0603

TDK

R1

1

WR04X1003FTL

100k/1%

R-0402

WALSIN

R2

1

WR04X1001FTL

1k/1%

R-0402

WALSIN

R3

1

WR04X000 PTL

0k

R-0402

WALSIN

U1

1

RT1025WS

ECG/PPG AFE IC

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

Richtek

Y1

1

DST-310S

32.768kHz/TFX-02S-32

CRY-DST310S

HARMONY



PCB Layout

Technical Document Image Preview

Top View

Technical Document Image Preview

Bottom View

Title Last Update Share Download
Evaluation Board User Guide 2018/08/24
Bill of Materials 2018/08/24
Gerber File 2018/08/24
Schematic 2018/08/24
Evaluation Board Design Notice 2018/09/27
RT1025

Low-Power, Integrated ECG/PPG AFE for Heart-Rate Monitoring and Measurements

RT1025

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 have > 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

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