On January 7, 2016, Silicon Labs (Core Technology Co., Ltd.) recently launched an optical heart rate sensor solution that can effectively reduce the cost and complexity of wrist heart rate monitoring (HRM). The new Si1144 HRM solution consists of a low power optical sensor module and an energy-saving EFM32 · Gecko microcontroller (MCU) running Silicon Labs Advanced HRM algorithm. Small Size Si1144 Sensor Module Integrates an optical sensor, a green light-emitting diode (LED), which supports up to 2 LEDs, analog-to-digital converter (ADC), control logic, and I2C digital interfaces.
According to the forecast of Silicon Labs, 100 million equipment with HRM function will be sold every year in the 2018 market, most of which are wearable devices on the wrist. SiLicon Labs SI1144 HRM solution is fully met, suitable for all kinds of wearable devices, such as movable tracking fitness belts, pediat and smart watch, and gym fitness equipment with HRM feature, bathroom Scale and senior people monitoring equipment.
Heart rate monitoring is the most popular biometric sensing technology suitable for all fitness people. From careful, hoping athletes who have improved exercise achievements can only seek more healthy, more active lifestyle, can get accurate HRM Heat consumption data, which makes people more easily control daily diet.
Traditionally, the application of heart rate measurements has been limited, and the chest band is used, and it is necessary to connect to an external device, such as a dedicated fitness watch or smartphone. These HRM solutions bring some special problems: Brochbands are often inconvenient and uncomfortable, while using smartphones during running or cycling is also difficult to monitor.
The wrist HRM technology changes the game rules of biological identification tests, which are more convenient and comfortable to measure heart rate, and can get measurement accuracy comparable to chest-based products. At present, there are many HRM solutions, the measurement results are also very large, most of which are expensive and power consumption, which reduces battery life. In addition, complex moving devices also increase the design complexity of HRM on the wrist.
Daniel Cooley, vice president of Silicon Labs IoT Product Marketing, said, "SiLicon Labs Si1144 HRM solution overcomes difficulties faced by the current wrist, providing accurate, easy to achieve and cost-effective solutions than similar competitive products. In addition The industry-leading power and minimal package size also makes the Si1144 module idea for power-sensitive and space-limited design. "
Key feature of Si1144-AAGX HRM module
Accurately sense the weak blood flow signal on the wrist, comparable to the excellent performance of the chest belt HRM design
Two HRM algorithms selection: static HRM and optionally dynamic (motion compensation) HRM using external accelerator data.
MCUs with optical modules in the HRM solution, including Pearl Gecko MCU, which integrates DSP-enabled ARM Cortex-M4 kernel for ultra-low power, high performance design; Jade Geckomcu, it integrates ARM Cortex-M3 kernel Applicable to simple, cost-sensitive design.
Completely integrated HRM IC, green LED lens, high sensitivity photodiode, low noise ADC, LED driver, optical barrier, and host communication / interrupt interface.
Two LED drivers support the maximum two LEDs.
Ultra-low power extended battery life: 1.71-3.6V Power supply conditions Laptom current. 1881.500NA.
The I2C serial communication interface supports the maximum 3.4 Mbps data rate.
10 Pin 4.9mm × 2.85mm × 1.2mm LGA module package.
Price and availability
The Si1144-AAGX HRM module is now produced and samples can be provided. The Si1144 module with the Silicon Labs HRM algorithm is $ 2.82 at 10,000 procurement. The HRM44-GGG-PS development board is priced at $ 57.60, which enables developers to quickly start the evaluation and development of HRM applications on the wrist. For the price of Jade and Pearl Gecko MCU, please visit the website: www.silabs.com/efm32. To order Si1144 modules, please visit the website: www.silabs.com/hrm.
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