Z_ECG
Overview
The Z_ECG is an electronics development board for 6TRON open source platform built around Analog Devices optimized analog front-end (AFE) AD8232 and Nordic Semiconductor nRF52832 RF SoC.
The electrocardiogram signal is collected through a standard ECG belt connected to the case. The signal is amplified and filtered by the AD8232 before being digitized by the 12-Bit ADC integrated in the microcontroller. An integrated electrode detection circuit permits to alert the user of electrode disconnection.
The nRF52832 SoC is a 32-bit ARM Cortex M4 CPU with up to 512kB Flash and 64kB RAM memory and a 2.4GHz RF transceiver. The SoC is multiprotocol capable and supports Bluetooth Low Energy. The board includes a battery charger with a micro USB-B header, a 300mA Lithium-Polymer rechargeable battery and a fuel gauge for the monitoring of the cell state-of-charge. External RAM is also available to permit the implementation of advanced signal processing algorithms. An accelerometer can provide information on the activity of the person carrying the object.
The Z_ECG board offers 6TRON users an ECG Object able to collect, monitor and transmit the Electrocardiogram signal (ECG) through a BLE Link at regular time intervals with a very low power
Specifications
Soc Features :
- ARM 32-bit Cortex-M4 CPU with (FPU)
- 64 MHz max CPU frequency
- AES (128 bit key) HW encryption with EasyDMA
- 512 kB flash
- 64 kB RAM
- Serial wire debug (SWD)
- 13.56MHz NFC TagBluetooth 5.1, 2.4 GHz transceiver**
- -96 dBm sensitivity in Bluetooth low energy mode
- UP to 2 Mbps data rate in Bluetooth low energy mode
- -20 to +4 dBm TX power, configurable in 4 dB step
- On-chip balun (single-ended RF)
- RSSI (1 dB resolution)
| Feature | Details |
|---|---|
| AD8232 | 2-electrode, Heart Rate Monitor Front End |
| BQ24075 | Standalone 1-Cell 1.5-A Linear Battery Charger with PowerPath |
| BMA456 | Low-power, 3-Axis Digital Output MEMS Accelerometer |
| User Interfaces | LED : Battery charger indicator Switches : user switch |
| Connectivity | 10-pin Tag connect RF antenna : Onboard planar antenna |
| Board size | Board alone: 63mm x 45.25mm Casing (TWN5-2-7W) :70 x 50 x 15mm |
| Power Supply | 1S liPo batteryMicro-USB |
| Category | Z_Object |
Block Diagram
The graphics below gives an overview of the board features and connections.
Software Support
The Z_ECG provide a demo example developed using Mbed OS.
Environmental impact
The Eco score of the Z_ECG is expressed in points representing the environmental impact of an average European per year.
Eco-score details
BOM
| Component | data | unit |
|---|---|---|
| Passive electronic component | 0,034 | g |
| Active electronic component | 0,0085 | g |
| LED | 0,21 | g |
| Components(average) | 0,0116 | g |
| Connectors Switchs | 3,144 | g |
| Logique type integrated circuit | 0,3685 | g |
| Memory type integrated circuit | 0 | g |
| PCB | 840 | mm² |
Consumption
| Low voltage electricity voltage France | ||
|---|---|---|
| Current | 20 | mA |
| Supply voltage | 5 | V |
| Autonomy | 100 | h |
| % use | 75 | % |
| Power | 0,0075 | kWh |
| Daily eco-score | 6,72E-04 |
|---|---|
| Yearly eco-score | 0,25 |