How can a pulse sensor that measures blood pressure protect your health?
Recently, Apple obtained a patent that allows a device to measure blood pressure. Judging from the patent drawings, this device is most likely a smartwatch.
It is reported that Apple's blood pressure monitoring system includes three parts: a pressure sensor , an expandable component, and a driver for the expandable component. In other words, Apple's new patent still follows the principle of traditional blood pressure measurement, but it has been miniaturized.
According to Apple's patent, their device plans to install a sensor to measure the pressure of blood flowing through the user's arm or leg. There is also an "actuator" to measure how much pressure is needed to get a good reading without making the user's arm uncomfortable. In addition, Apple said that the device may be equipped with a working touch screen and can connect to Bluetooth.
Recently, ROHM, a world-renowned semiconductor manufacturer, has developed the photoelectric pulse sensor "BH1792GLC" for wearable devices such as smart watches and smart bracelets, which achieves 1024Hz high-speed sampling and supports pressure measurement and vascular age measurement.
The "BH1792GLC" is a new second-generation ROHM pulse sensor that has received high acclaim for its "high precision" and "low power consumption". Its low power consumption performance achieves the industry's lowest level of power consumption of 0.44mA (when measuring pulse rate), which helps to drive the application for a longer time. In addition, it also supports high-speed sampling of 1024Hz. Compared with previous products, the pulse measurement speed is 32 times faster, meeting the needs of the times for vital sign sensing such as pressure measurement and vascular age measurement that require high-speed sampling.
Features
1024Hz high-speed sampling is achieved to meet complex vital sign measurement needs such as pressure and vascular age measurement. In addition, this product also has a built-in infrared sensor for installation judgment, and all the sensors required for wearable devices are available, which greatly helps to simplify the system.
2. ROHM's unique optical filter
Achieve high-precision detection
The photosensitive part consists of an infrared cut filter and a green filter. The ROHM unique optical filter that only transmits green wavelengths has been used to successfully reduce the influence of interference such as infrared and infrared light to less than 1/10 of general products. This enables high-precision pulse measurement even in environments with drastic changes such as exercise and strong infrared light such as sunlight.
3. Achieve the industry's lowest level of low power consumption
Helps in long-term driving of applications
By selecting an external green LED (ROHM's "SMLMN2ECT") that is ideally suited to the pulse sensor's light-sensing characteristics and optimizing the optical design, the industry's lowest class current consumption of 0.44mA (when measuring pulse rate) has been achieved.
In addition, compared with previous products, a new FIFO (First in First out) function is installed to reduce the power consumption of the HOST (microcontroller) side. By reducing the power consumption of the pulse sensor and microcontroller, it helps the application to achieve long-term driving.
4. Very popular sensor expansion board evaluation board
Available for sale simultaneously, importing is easier
In parallel with the sample sales of this product, the pulse sensor evaluation board "BH1792GLC-EVK-001" for the sensor expansion board "SensorShield-EVK-001" that can be connected to the "Arduino Uno" general-purpose microcontroller development board that is widely used worldwide has been launched on two online sales platforms, AMEYA360 and RightIC.
In fact, there are already domestic health companies that have made health bracelets that can measure heart rate and blood pressure, but because they use algorithms and sensors together, the accuracy needs to be improved, but they can already measure results relatively accurately. Apple's approach is more like a perfection.
However, all the technical patents applied for by Apple may not be transformed into actual products and technologies, so it is still unknown whether Apple will really launch a smart watch that measures blood pressure in the future.
Article Source:
ROHM Semiconductor Community ( http://rohm.eefocus.com)
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