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Zest_Sensor_ECG

Overview

The Zest_Sensor_ECG is an electronics development board for 6TRON open source IoT platform for Electrocardiogram (ECG) monitoring.

The board includes 2 single channel independant topologies:

  • A fully integrated ultra-low power biopotential Analog Front-End (AFE) from Maxim Integrated: MAX30003. The circuit outputs the digitized ECG signal and the Heart Rate (integrated R-toR Detection Algorithm)
  • A mixed architecture with AD82332 AFE from Analog Devices, a 50Hz active rejection filter and an optional 16-bit SAR ADC from Texas Instruments, AD8866.

The 2 Instrumentation amplifiers have independent Jack input headers with optional Leg driver connection. Electrode disconnect alert is provided with the 2 circuits. For safety purpose, the board is to be battery powered.

The Zest_Sensor_ECG board can be used with standard patch electrodes or with ECG belt.

Zest_Sensor_ECG

Specifications

MAX30003Single channel integrated Biopotential AFE Integrated R-R detection algorithm for automatic heart rate monitoring 2-Lead standard operation Optional 3-lead operation with right-leg drive signal 0.5Hz digital High-pass filterConfigurable 0.04Hz, 0.4Hz or 4Hz analog High-pass filter Selectable 40Hz, 100Hz or 150Hz low-pass filter Digitization: integrated 18-bit Sigma-Delta ADC with 15.5-bit effective resolution Integrated lead-off detect Ultra-low power operation SPI interface
ADS8232Single channel integrated Biopotential AFE 2-Lead standard operation Optional 3-lead operation with integrated right-leg drive signal Fully configurable high-pass and low-pass filters with integrated amplifiers Fully configurable gain with external resistor network Fast restore feature fort fast recovery Integrated lead-off detection feature Low-power operation SPI interface
AD8866Micropower, single-ended input, SAR analog-to-digital converter 16-bit resolution Sample rate up to 100-kSPS SPI interface
User Interfaces1 switch for the the selection of 2 or 3-electrode configuration 1 switch for setting the mode of detection of the electrode disconnection (AC for 2 electrodes or DC for 3 electrodes) 1 user LED for power On
Connectivity80-pin 6TRON header 2 x 3-ways Jack header
Board size80 x 39 mm
Power Supply3.3 to 12V from stack The use of a Zest_Battery_LiPo board is highly recommended for safety purpose
CategoryZest_Sensor

Block Diagram

The graphics below gives an overview of the board features and connections. Zest_Sensor_ECG

80-pin 6TRON header

This table shows how the pinout on Zest_Sensor_ECG corresponds to the pinout on the 6TRON BUS connector (the latter shown in the two middle columns).

Description6TRON functionPin numberPin number6TRON functionDescription
-VJACK12VJACK-
-VJACK34VJACK-
-VHV56VHV-
-VHV78VHV-
-DIO8910VIN_EN-
SPI1 MISODIO71112DIO9-
LOD-DIO61314DIO10AD EN
-MD1516DIO11LOD+
-DIO51718DIO12-
GroundGND1920GNDGround
GroundGND2122GNDGround
6TRON Stack Power SupplyVIN2324VIN6TRON Stack Power Supply
6TRON Stack Power SupplyVIN2526VIN6TRON Stack Power Supply
-VB_EN2728DIO13-
-VB_OUT2930DIO14-
SPI1 ClockDAC13132DIO15-
-ADC43334DIO16-
Analog Input (alternate)ADC33536DIO17-
-ADC23738DIO18-
Analog InputADC13940GND-
-EXT_NRST4142GND-
DIN TIDIO44344VREF-
CONV TIDIO34546DIO19INT2B MAX
INTB MAXDIO24748DIO20SPI2 Chip select (alternate)
-DIO14950DIO21-
-WKUP5152DIO22-
-ICAPT5354DIO23-
-PWM35556DIO24-
-PWM25758DIO25-
-PWM15960DIO26-
SPI2 Chip selectSPI1_SS6162DIO27-
SPI2 ClockSPI1_SCK6364DIO28-
SPI2 MISOSPI1_MISO6566DIO29-
SPI2 MOSISPI1_MOSI6768DIO30-
-UART1_TX6970DIO31-
-UART1_RX7172DIO32-
-I2C1_SDA7374DIO33-
-I2C1_SCL7576DIO34-
-CAN1_TX7778DIO35-
-CAN1_RX7980DIO36-

Software Support

The Zest_Sensor_ECG provides a demo example developed using Mbed OS. The board can run on Zest Core development boards.

Environmental impact

The Eco score of the Zest_Sensor_ECG is expressed in points representing the environmental impact of an average European per year.

Zest_Sensor_ECG

Zest_Sensor_ECG

Eco-score details

BOM

Componentdataunit
Passive electronic component0,143g
Active electronic component0,028g
LED0,0006g
Other component0,006g
Connectors Switchs3,79g
Logique type integrated circuit0,369g
Memory type integrated circuit0g
PCB3120mm²

Consumption

Low voltage electricity voltage France
Current20mA
Supply voltage5V
Autonomy100h
% use75%
Power0,0075kWh

Ressources