introduction
With the popularity of pebble in smart watch products, the popularity of wearable smart devices in 2014 is self-evident. Numerous mobile phone industry giants, traditional sports equipment manufacturers, and emerging initial innovations have plunged into the application market of wearable smart devices and launched exclusive products. It can be seen that in the market of wearable devices, when the competition is over, the "river and lake" will surely cause a "hurricane" to kill. In order to make an enemy, developers must have their own killings in the immature wearable market. Therefore, only subversives can win wearable devices, achieving more cross-border integration and user demand segmentation.
Look at the wearable devices that have launched physical products on the market. The products of smart bracelets and smart watches are far ahead of other smart devices such as smart glasses and smart rings. The main control platform from the product application can be divided into two categories. First, the main controller with high frequency and running to process multimedia data is equipped with Android operating system. The peripheral functions are rich and can be analogized as “miniature version of smart phoneâ€; Second, the use of relatively low frequency, embedded application architecture of the main controller, running the embedded micro-core operating system, external expansion of various types of sensor applications, highlighting low-power, long-term standby user experience. The above two types of equipment have their own characteristics, advantages and disadvantages, and can meet the needs of different user groups. However, from the term "wearable", lower device power consumption and longer battery life will be the core user experience for many devices.
For wearable smart device applications, how can North High-Tech as a supplier of semiconductor ICs help device developers develop devices with low power consumption? Mainly reflected in the North High-Tech based silicon labs ultra-low-power microcontroller core, integrated low-power applications of wearable devices, including low-power MCU EFM32, low-power display screen Sharp Memory LCD, low power Bluetooth-consuming technology, low-power touch, health monitoring sensors and other devices.
EFM32
The EFM32 is the world's lowest power 32-bit Cortex-M family of microcontrollers from Silicon Labs, an industry leader in high-performance, analog-intensive, mixed-signal IC innovation. The EFM32TM Gecko microcontroller family includes energy-efficient devices based on the ARM® Cortex®-M4 (Floating Point Unit (FPU)), Cortex-M3 and Cortex-M0+ processors.
The actual code from Flash is executed in active mode with 180μA per megahertz, 900nA in deep sleep mode and 20nA in shutdown mode. In the application benchmark, the low current performance of the EFM32 microcontroller, combined with a startup time of less than 2μs, extends battery life by at least 4 times.
On the peripheral side, the EFM32 provides low-power peripherals including low-power LEUART serial communication interfaces and analog peripherals such as LETIMER timers, RTC real-time clocks, LESENSE sensor interfaces, USB OTG and ACMP. The EFM32 microcontroller is unique in that its “peripheral reflex system†(PRS) can be paralleled with a standard 32-bit ARM bus. The PRS allows the EFM32 Gecko peripherals to operate autonomously and communicate, while the central processor is turned off, extending sleep time and saving a lot of energy.
For smartwatch applications, the EFM32 has its unique advantages and is the best choice for low power and extreme design. For example, when the smart watch screen display application, EFM32 can fully combine the DMA and SPI interface low-power drive Sharp 1.28-inch screen LS013B7DH03, the overall power consumption of EFM32+LCD is as low as 2μA in static picture display, EFM32+LCD when 1Hz refresh time The overall power consumption is as low as 5μA (local refresh), which fully reflects its low power consumption.
According to silicon labs news, Magellan, the leader in providing innovative GPS devices for automotive, fitness, outdoor and mobile navigation, chose Silicon Labs' EFM32TM Giant Gecko microcontroller (MCU) as the energy-efficient processing platform for Magellan Echo smart sports watches. The Echo Smart Sports Watch, awarded the "CES 2014 Innovative Design and Engineering Award", is the first smart sports watch with an "open" platform. The user can see and control the app on the mobile phone at the wrist. It is based on the ARM® Cortex®-M3 core 32-bit Giant Gecko MCU as the main controller, equipped with a Sharp 0.99-inch circular screen as a display, running low-power Bluetooth BLE to connect with the smartphone. The EFM32 plays a key role in the energy efficiency of sports watches, allowing Echo to run for up to 11 months on a single CR2032 coin cell battery.
EFM32 has on-chip RAM resource range of 2K~128K bytes, Flash resource range of 4K~1024K bytes, and the package format includes miniaturized QFN and BGA types. In order to meet the high integration of wearable devices, the volume is small and thin. condition. It also supports different series of hardware and software compatibility with the package, which is convenient for device developers to consider product serialization and platform compatibility of different products.
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