A dynamic heart rate sensor comparable to MIO!
Heart rate is an important parameter reflecting the function of the human circulatory system. Regular measurement of heart rate, understanding of physical function, and important early warning of cardiac work abnormalities, and accurate monitoring of dynamic heart rate on smart wearable devices is not easy because There are many factors to consider in heart rate monitoring, including human skin color, fat and thin, body temperature, static, walking, running and optical structure design. It is necessary to accurately measure different people and different motion states by the same algorithm.
In response to the above problems, Silicon Labs launched a heart rate sensor Si1144 with dynamic heart rate monitoring, ultra-low power consumption, high accuracy, simple optical design, free algorithm library, etc. Customers can quickly apply to smart wearable devices. Qiang has already represented the product. Figure 1 below is a block diagram of the heart rate sensor with integrated PD, ADC, filter and LED driver.
Figure 1: Heart rate sensor structure
Program advantage
First, the dynamic heart rate
Sampling the HRM algorithm of EFM32+SI1144+Silicon labs, with G-sensor and dynamic compensation, the accuracy is high, comparable to the monitoring effect of POLAR heart rate belt and MIO watch.
Second, ultra low power consumption
Standby power consumption is less than 500nA, dynamic heart rate detection power consumption is 650uA, which is several times lower than competitors' power consumption, which is very suitable for ultra-low power consumption requirements of wearable products.
Third, the structure is simple
The green LED and sensor are packaged together to simplify the optical structure and make it easy to design.
Fourth, free algorithm
Providing Silicon Labs' HRM algorithm library, the heart rate value can be read out in a simple configuration, and the product design can be completed quickly without considering complex algorithm processing.
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