Wearable Coronary heart Price Monitor Reference Design

The design exhibits wearable coronary heart price monitoring with a single 8-bit microcontroller, utilizing Section Division Multiplexing to measure indicators with out interference and scale back prices.

Designing wearable medical units immediately entails combining coronary heart price monitoring with different well being and compliance monitoring. Most wearables measure coronary heart price with reflective screens. These screens typically battle with noise regardless of utilizing superior and dear circuits like Analog Entrance Finish (AFE) chips. Discovering a less expensive technique to scale back this noise is essential. The  demonstration board for wearable coronary heart price monitoring from Microchip illustrates how one can precisely measure coronary heart price utilizing only a single 8-bit microcontroller (MCU). It makes use of a Section Division Multiplexing method to measure varied indicators without delay with out interference. This technique makes use of the PIC16F1779 MCU’s built-in Core Unbiased Peripherals (CIPs), permitting for a low-noise design and slicing down on prices in comparison with conventional strategies.

The design highlights the capabilities of utilizing a single-chip setup to measure coronary heart price successfully. It makes use of the eXtreme Low Energy 8-bit microcontroller (MCU), which includes a number of built-in options. One key function is the Section Division Multiplexing method that permits for the simultaneous measurement of a number of indicators with none sign interference, often called cross speak. This integration considerably lowers the general invoice of supplies (BOM) price due to using Core Unbiased Peripherals (CIPs) and built-in analog functionalities.

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The CIPs additionally assist in lowering software program overhead, enhancing the system’s effectivity. The MCU consists of built-in 10-bit Digital-to-Analog Converters (DACs) and operational amplifiers (op amps) that exactly management the LED depth, essential for correct coronary heart price detection. Moreover, Configurable Logic Cell (CLC) CIPs are employed to handle the LED driving straight, thus eliminating the necessity for CPU involvement on this course of. This setup not solely simplifies the design but additionally enhances efficiency whereas holding prices low.

The MCU used is extremely built-in, that includes each Clever Analog and digital parts fitted to a wide range of purposes together with lighting, energy provides, battery charging, motor management, and different common functions. These units are outfitted with a number of operational amplifiers, 5-/10-bit DACs, high-speed comparators, a 10-bit analog-to-digital converter (ADC), 10-/16-bit pulse-width modulators (PWMs), and a Programmable Ramp Generator (PRG). Additionally they embrace different peripherals that allow the creation of closed-loop techniques internally without having exterior pins or extra PCB house.

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The MCU can drive refined capabilities like an LED dimming engine utilizing the ten and 16-bit PWMs, Digital Sign Modulator (DSM), and tri-state output operational amplifiers. The Peripheral Pin Choose (PPS) function provides flexibility, simplifying the PCB format and enhancing peripheral utilization by permitting customers to remap digital peripheral pins to any enter/output pin. This versatility makes these microcontrollers superb for effectively dealing with advanced duties throughout a number of purposes.

Microchip has examined this reference design. It comes with a invoice of supplies (BOM), schematics, meeting drawing, printed circuit board (PCB) format, and extra. The corporate’s web site has extra information in regards to the reference design. To learn extra about this reference design, click on right here.