MPUs and MCUs
Note: In this example the PIR click is used as the base for modifi cations because it was more convenient than designing a new PCB and acquiring the required components. This modifi ed solution does not compete with the purpose of the Click boards. With these modifi cations, taking advantage of the built in 12-bit differential ADC and the PGA, Figure 3 also illustrates how few external components are required when the right MCU is selected.
With fewer external components, the hardware and PCB design will be cleaner and more compact. In addition, software and fi rmware can be more compact as more of the tasks are handled by the MCU. Timing and synchronization are also easier to manage. Moving complexity from hardware into the MCU makes it easier to change and add functionality during development. It also becomes more convenient to change code to optimize power consumption or change the sensitivity to environmental conditions – for example, when the ambient temperature exceeds 30°C, sensors can struggle to detect a human being. Machine learning can also be added to recognize movement patterns, teaching the system to recognize noise or tell
Figure 3. Modified PIR Click and schematics
the difference between a person and an animal. For motion detection applications using PIR sensors, MCUs, like the ATtiny1627, move the complexity from hardware to fi rmware and software, as so much of the required functionality is built into the
MCU itself. The result is that complexity is reduced, while fl exibility is improved. By offering smart and sophisticated built- in features and functionalities that improve current consumption and power effi ciency, powerful MCUs with a small footprint like
the ATtiny1627 will increase the lifetime of battery powered and connected applications, while reducing design complexity, total system costs and time to market.
www.microchip.com
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12/04/2022 08:51 April 2022 41
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