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Huh, is this Mr. Yama?
A certain technical magazine that my company subscribes to on a regular basis has been circulated, so I read it diagonally. Whoops, this month's ARM special. If you look at it, there is also an article on EFM32. The low power consumption, which is a feature of the product, is written, and I understand EFM well. I started reading the article while being interested, huh? Is the author Mr. Yama? I was surprised because I had not heard that it would be published in a technical magazine. Mr. Yama, you are also doing writing activities. I give up. Mr. Yama is probably the person who has the most information about the EFM32 series in Japan, so it's only natural that I get a request to write about it.
Mr. Yama, who has written for a technical magazine, Low Power Consumption Microcomputer EFM32 Hands-on Workshop Introduction! <free of charge> I am in charge of the lecturer of This is your chance to receive a direct lecture! Please join us!
From here, I will introduce the functions of LESENSE that Mr. Yama taught me at the study session.
In this regular study session, we will learn about LESENSE (Low Energy Sensor Interface), one of the low power consumption features of the EFM32 series.
LESENSE is a function that can process signal detection and state judgment only with dedicated low-power hardware, such as LC sensors and capacitive sensors, which would require CPU processing with a normal microcomputer. (Except Gekko, Happy, Zero series)
By LESENSE
(1) Voltage comparison detection → (2) Detection circuit count → (3) Count value comparison judgment
This makes it possible to reduce the CPU intervention and operating rate to the utmost limit, and achieve ultra-low power consumption while maintaining system operation.
The features of LESENSE are as follows.
- Automatic monitoring of multiple sensors even when the CPU is sleeping
- Various sensors such as LC sensor and capacitance sensor can be used
- Acquisition conditions can be defined by state machine
- Works even in Deep Sleep state (EM2)
Coordination of peripherals
LESENSE is used in conjunction with other peripherals. Using an EM3-powered analog comparator as an input allows LESENSE to be activated by triggering the comparator action. In addition, by linking with PRS, it becomes a trigger to operate other peripherals.
Judging by the detection count even for applications that assume metal detectors
Sample source: lesense_lcsense_single
You can easily try it using the sample source: lesense_lcsense_single.
