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Embedded micro digital temperature sensor DS18B20 application

Embedded micro digital temperature sensor DS18B20 application Temperature is a key factor affecting the performance of the sensor, temperature compensation to improve the performance of the sensor plays a key role in developing a new generation of sensors, temperature measurement problems in order to once again put in front of people. In the space of less than 2 cm in place of a traditional S0-8 or T0-92 package devices have become crowded, and even less to place a non-essential function of the temperature sensor. Therefore, how to accurately measure very small space within the sensor, transmission, processing temperature information is a key constraint sensor performance and volume, the use of imported high-performance, small size, DS18B20 digital temperature elements can be a good solution to this problem, in addition, some sensors require multi-point temperature compensation, simply parallel multiple DS18B20 can solve this problem without additional hardware, the circuit is very simple. 1, DS18B20 and "frontline" Bus Throughout the SpO2 extension cable change in temperature sensor existing international, the general trend is converted from analog to digital, the corresponding volume is constantly decreasing. The use of high-precision sensors in volume is very demanding, the digital output type of temperature sensor DS18B20 most meet the requirements. Previous output analog temperature signal different, DS18B20 be powered through the data lines, power lines and signal lines will compound together, using only one port line; line bus interface supports both digital temperature output via the "line" bus protocol, bus only one interface port for communication, each chip only coding, support network addressing, suitable for multi-point distribution applications, the interface circuit is very simple, without additional hardware. Another advantage of this digital mode of transmission line bus is greatly improved anti-jamming system, suitable for field temperature measurements in harsh environments. DS18B20 temperature range of -55 ~ + 125 锟斤拷, in the Medical Cable range of -10 ~ + 85 锟斤拷, the precision of 锟斤拷 0.5 锟斤拷, temperature 9 to 12 digital readout, with Pressure Infusion Bag a resolution of 0.062 5. Temperature directly to the scene digital transfer; DS18B20 real surprise is its 锟斤拷SOP package, this package is only 3.0 mm 锟斤拷 6.4 mm in the horizontal dimension, height of less than 1.2 mm, significantly reduces the volume, so you can save more space, ideal for use size used in demanding sensor for narrow space; 3 ~ 5.5V voltage range, making the system design is more flexible and convenient; 9 through the program can be set to 12-bit resolution, accuracy of 锟斤拷 0.5 锟斤拷, the measured temperature stored in the E2PROM, after power is still preserved, cost performance is also very good! it is mainly composed of 64 lithography internal EEG electrodes ROM, a temperature sensor, non-volatile temperature alarm triggers TH and TL and internal registers of four parts. 1.1 DS18B20's "frontline" Bus identification number for each DS18B20 has a unique 64-bit "frontline" Bus identification number, stored inside the DS18B20 ROM (read only memory) in. 8 is the beginning of the product type code, followed by the 48 unique serial number of each device, the last eight in front 56 of the CRC. ROM's role Disposable leadwires is to make every DS18B20 are different, so that you can achieve multiple DS18B20 articulated bus on a purpose 1.2 DS18B20 DS18B20 temperature data representation format has two 8-bit registers for storing the measured temperature value, they store temperature data by 2 bytes, respectively, LS Byte (low byte) and MS Byte (high word section), MS Byte high five storage temperature value symbol, if the temperature is negative (锟斤拷), the MS Byte high five as a whole, otherwise all 0. MS Byte 3 is Fingertip Oximeter used to store low-temperature value of the complement, if the measured temperature is greater than 0, as long as the measured values multiplied by 0.0625 to get the actual temperature, if the temperature is less than 0, the measured values need to invert plus a further multiplied by 0.0625 to get the actual temperature.

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