STM32 Holter Receiver Board - Design Review (ECG)
Hello everyone,
I'd like to request some help with an ECG Holter Receiver Board. This is my first time designing a MCU board.
I am basing this design on this article from Analog Devices: https://www.analog.com/en/resources/analog-dialogue/articles/ecg-front-end-design-simplified.html
As some components are not available from LCSC to produce it on JLCPCB I chose a different MCU. My choice was to go with the STM32G431CBT6.
The same applies for the Voltage Booster (LM2662MX/NOPB + LP2985IM5-4.0/NOPB) and the Voltage inverter (LM2664M6/NOPB)to step up voltage from 3.3V to 5V and generate -5V to power the operational amplifiers.
For power I'm planning to use two different sources 5V from USB as well as providing an option of hooking up a 9V battery to the circuit. Both are stepped down to 3.3V with an AMS1117-3.3V.
I plan on driving a ILI9341 display for showing the ECG plot in real-time as well as UART interface for sending data out to a PC so analysis is performed.
For programming the MCU I used a JTAG interface. This will be my first time ever using JTAG to flash a MCU.
The analog ECG analog output is connected to an ADC and will be sent out through UART.
Is there a chance this could work?
I apologize for the polluted and unorganized schematic as well as the block diagram.
Thanks for reading.
Giovanne Lucas Barreto
ECG System Block Diagram