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LED-Based Wake-Up Circuit for Microcontrollers
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DOI：10.1109/TIM.2020.3009340.png)
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摘要
En 中文
This article proposes, analyzes, and tests a wake-up circuit for a microcontroller (MCU) that uses a light-emitting diode (LED), operating as a photodetector, illuminated by a smartphone flashlight. The wake-up circuit consists of a high-pass filter and a voltage-level translator that interfaces the LED, with a suitable resistor in parallel, to the MCU. When illuminated by a switching flashlight, the LED generates a square voltage that is conveniently converted in logic levels at the output of the wake-up circuit. A firmware embedded into the MCU additionally checks that a predetermined sequence of logic pulses at a given rate is accomplished to activate the MCU. This article includes a theoretical analysis and experimental results that validate the proposed circuit.
Keyword:
Light emitting diodes
Sun
Microcontrollers
Optical filters
Photodiodes
MOS devices
Resistors
Light-emitting diode (LED)
low-power mode (LPM)
microcontroller (MCU)
optical wake-up circuit
photodiode
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期刊
IF:
5.9
论文数:
2.0W
被引数:
5.8W
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