Main characteristic of DS18B20 digital temperature thermocouple sensor
DS18B20 digital temperature thermocouple sensor main features:
1, to adapt to more wide voltage range, voltage range: 3.
5 v, the parasitic power mode can be made of cable power supply;
2, unique way of single wire interface, DS18B20 in connected with the microprocessor need a mouth line can be realized only when the microprocessor and the DS18B20 two-way communication;
3, DS18B20 to support more networking function, multiple DS18B20 can be in only three lines in parallel, achieve network multi-point temperature measurement;
4, DS18B20 in use do not need any peripheral components, all sensors and conversion circuit integration within the form such as the integrated circuit of a triode;
5, - 55 ℃ ~ + 125 ℃ temperature range, in -
10 accuracy of plus or minus 0 ~ + 85 ℃.
6, the resolution of the programmable for 9 ~ 12, the corresponding distinguish the temperature of 0 respectively.
125 ℃ and 0.
0625 ℃, can achieve high precision temperature measurement;
7, when nine resolution in 93 at most.
Convert temperature to digital within 75 ms, 12 resolution up to convert temperature to digital within 750 ms, faster;
8, measurement results, direct output digital temperature signals, with '1-wire bus' serial transmission to the CPU, can send CRC check code at the same time, with a strong anti-jamming error correction ability;
9, negative pressure characteristics: power supply when meet the polarity, the chip will not burned by hot, but it can't work normally;
DS18B20 digital temperature thermocouple sensor shape and internal structure of the
DS18B20 internal structure is mainly composed of four parts: a 64 - bit lithography ROM, thermocouple temperature sensor, the temperature of the nonvolatile alarm trigger TH and TL, configuration register.
The appearance of DS18B20 and figure 1 pin is arranged as follows:
figure 1: DS18B20 appearance and pin arrangement diagram
DS18B20 pin definition:
1, the DQ for digital signal input and output end;
2, GND for power;
3, VDD to external power supply input terminal (
In the parasitic power connection mode grounding)
figure 2: the DS18B20 the internal structure of the
more high quality thermocouple sensor
key words: thermal resistance, thermocouple, thermal resistance, platinum resistance, PT100, PT1000, pressure thermocouple sensor, digital temperature thermocouple sensor