The DS-18B20 number temperature
spreads a feeling machine
The DS-18B20 number temperature spreads a feeling machine, the product adoption's United States' DALLAS company produces of DS18 B20 can set net number the temperature spread the feeling machine chip to pack but become and have to bear to whet to bear to touch, the physical volume is small, use convenience, seal to pack a form diverse, be applicable to various narrow and small space equipments number to measure moderate control realm.
1、the technique function describe:
1.1 special single lines connect a people's method, DS18 B20 while linking with microprocessor only need a line can immediately carry out the double of microprocessor and DS18 B20 toward the communication.
1.2 measure scope-55 ℃ ~ +125 ℃ , proper measure resolution's 0.5 ℃ .
1.3 support several set nets function, several DS18 B20s can merge at unique three on-line, the most can merge 8, if amount was excessive, it would make power supply the power electric voltage over low, result in thus the signal delivers of unsteady, the realizations order to measure more
1.4 work the power:3~5V|DC
1.5 don't need any outer circle component in the use
1.6 measure the result measure a way string with 9~12 numbers line transmission 1.7 stainless steels protect to take care of diameter Φ 6
1.8 be applicable to DN15~25, DN 40~ DN250 various equipments that lie industrial piping of quality and narrow and small space measure
1.9 standards install the thread M10 X1, M12 X1.5, the G 1|2 term chooses
1.10 PVC electric cable direct the line or virtuous type ball type connect line box line, the easy to and other electric appliances equipments links.
2、Application
2.1 products are applicable to cold storage, food Cang, keep a bottle, tele-communications engine room, electric power engine room, cable slot etc. measures moderate control realm
2.2 stalk tiles, urn body, the Fang machine, the air condition, waits industrial equipments of narrow and small space to measure a moderate control.
2.3 car air condition, refrigerator, cold cabinet, and medium low temperature dry box of etc.s. 2.4 provide hot|make cold piping calories to calculate, the central air condition divides a thermal energy to calculate to measure a moderate control with industrial realm
3、Product model number and specification
The model number measures scope to install thread electric cable length to apply piping The B20 -55~125s TS-18s have no 1.5 ms TS-18B20A -55~125 M10X1 1.5m DN15~25
The B20 TS-181|s Bs-55~125ses 2 Gs connects line box DN40~ 60
4、Connect line elucidation
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The characteristics special front line connects, needs a line to correspond by letter to order more ability and simplified a distribute type the temperature spread the feeling application didn't need an external component to use data total line power supply, the electric voltage scope has never needed to provide for use the power diagraph temperature scope for the 3.0-5.5 Vs BE-55 ℃ to+125 ℃ .The Fahrenheit is equal hence-67-257 Fahrenheit degree-10 ℃ go to+85 ℃ accuracy inside the scope is ±0.5 ℃
The temperature spreads a feeling machine's programmable resolution to convert into 12 number formats for 9~12 temperatures biggest be worth to 750 a milli- of second the customer can define of not and easily lose sex temperature to report to the police to establish an application to include a constant temperature control, industrial system, consume electronics product thermometer, or any hot sensitive system
The number thermometer that describes the DS18 B20 provides 9-12(the programmable equipments temperature read a number.The information is disheveled hair to send to|connect through a line from the DS18 B20, so central microprocessor and DS18 B20 only have a per line conjunction.For read and write and the temperature conversion can acquire energy from the data line, don't need to circumscribe the power.Because each DS18 B20 includes a special ordinal number, several ds 18 bs 20 seses can be existed to a total line at the same time.This makes the temperature spread a feeling machine to place in many different places.Its use is a lot of, include an air condition environment control, detect equipments inside the building or machine, and carry on process monitor and control.
The DS18 B20 internal structure mainly constitutes to°from the four-part cent:64 temperatures that only engrave ROM and temperature to spread a feeling machine and don't vaporize report to the police to trigger a machine TH and TL and allocation to deposit a machine.While equiping signal line Gao, the internal capacitor stores an energy from a line and corresponds by letter circuit to the film power supply, and at low electricity even period for film power supply until next Gao Dian Ping's arrival re- refreshes.The power of the DS18 B20 can also.5V electric voltages get from 3 Vs-5s in the exterior.
The DS18 B20 adopts front line correspondence to connect.Because the front line correspondence connects, have to previously complete ROM enactment, otherwise memory and control function will can not use.Mainly provide following function to orderany first of a:
1）read ROM 2）ROM match 3）search ROM 4）jump ROM
5）report to the police a check.
These instruction operation the function has no 64 sequences that only engrave ROM of a spare part, can be hanging several spare parts on the front line to make selection a certain spare part, at the same time, the total line can also know always on-line hang how much, what kind of equipments.
If the instruction successfully makes the DS18 B20 completion temperature measure, the data saves in the saving machine of DS18 B20.The performance of a control function conductor designation DS18 B20 measures.Measure result will be placed in the DS18 B20 memorieses, and can let reading to send out the conductor of remembering the function, reading contents of slice ascend saving machine.The temperature reports to the police to trigger machine TH and TLs to all
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have one word stanza EEPROM data.If DS18 B20 not the use report to the police to check instruction, these deposit a machine to be a general customer to remember use.Still carry to there is allocation word's the stanza converting by ideal solution temperature number on the slice.Write TH, TL instruction and allocation word stanza makes use of instruction completion that remembers function.Pass to slowly save a machine to read to deposit a machine.All datas read writing all a beginning from the lowest.
The DS18 B20 has 4 main data partses:
(1)only engrave 64 sequences in ROM are what factory front be only engraved likes, it can see make the address sequence that is the DS18 B20 code.64 alignments that only engrave ROM are:Starting 8(28 Hs) is the product type mark number, immediately after of 48 sequences that is the DS18 B20 oneselfses, last 8 is 56 front circulating redundancy schools to check code.(CRC=X 8+ Xs 5+ Xs 4+s 1)The function that only engraves ROM is to make each DS18 B20 all each not same, so can carry out a purpose that is always on-line to hang to connect several DS18 B20s.
(2) the temperature in the DS18 B20 spread a feeling machine to complete the diagraph to the temperature and take 12 conversions as an example:The binary system expanding with 16 signs repairs code to read to count a form to provide, with 0.0625 ℃ |the LSB form express, among them, the S is a sign.
The saving machine of DS18 B20 includes high speed to temporary save machine RAM and can give or get an electric shock to wipe in addition to RAM, can give or get an electric shock to wipe in addition to RAM includes temperature to trigger machine TH and TL again, and an allocation deposits a machine.Saving machine ability the integrity really settle the communication of front-line port, the number starts using to write the order of depositing the machine to write into deposit a machine, immediately after can also use order of reading to deposit the machine to confirm these numbers.After confirming can use the order that the replication deposits a machine can give or get an electric shock to wipe to transfering these numbers to in addition to RAM in.While once modifying to deposit the number in the machine, this process can ensure the integrity of number.
The high speed temporary saves machine RAM to constitute to°from the saving machine of 8 word stanzas;The first and the second word stanza are temperatures to show.The fourth Sha-ho word stanza is to make duplicate TH and TL, at the same time the fourth Sha-ho number of word stanza can renew;The fifth word stanza is to make duplicate allocation to deposit a machine, the fifth number of word stanza can renew at the same time;6, 7, 8, three word stanzas are calculator oneselfs use.Using reads that the order that deposit a machine can read the ninth word stanza, this word stanza is eight word stanzas to the front to carry on schools to check.
648 ex- oneself codes that is a DS18 B20 that only engrave ROM, next 48 are a continuous number code, 8 of end is to 56 ex- of the CRC schools check.64-the light of engrave ROM and include the function order of 5 ROMs:Read ROM, match ROM, jump up ROM, check to seek ROM and report to the police to check to seek.
The DS18 B20 can use external power VDD as well as use the power in the living on of inner part.When the VDD port connects the electric voltage with 3.0 Vs ~Vs-5.5ses is use external power;When the VDD port connects ground used the power in the living on of inner part.No matter is an inner part to live on the power or an external power supply, I|the O line want to connect a 5 K Ω to or soly and up pull electric resistance.
Allocation's depositing a machine is the conversion that installs different number to make
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sure temperature and number.
R1, the R0 is the decision of temperature, from the R1, the different combination of R0 can install for 9, 10, 11, 12 temperatures show.So can know a different temperature conversion to should of conversion time, four kinds of resolutions of allocations distinguish to 0.5 ℃ , 0.25 ℃ , 0.125 ℃ and 0.0625 ℃ , factory take installing as 12.
DS18 B20 at factory with install for 12, read temperature totally read 16, so the empress is 112 enter make to convert into 10 enter make after at multiply 0.0625 is then measure of temperature, also need to be judged plus or minus.Front 5 piece words are signs, current 5 is 1:00, read of temperature is minus quantity;5 is 0:00, read at present of temperature is plus quantity.16 numbers put from low to Gao Wei.
The instruction agrees on code operating instructions:
The temperature converts the 44 H start DS18 B20 to carry on a temperature conversion
Read to temporary save machine BEH to read to temporary save machine 9 word stanza contentses
Write temporary and save the machine 4 EHs to write in a data temporary TH of saving the machine and TL word stanza
The replication temporary saves the machine 48 Hs temporary save the TH of machine and TL word stanza to write E2 RAM
Re- adjust the E2 RAM B8's Hs write the E2 TH within RAMs and TL word stanza to arrive to temporary save machine TH and TL word stanza and read that the signal that the B4 H start DS18 B20 of the power supply method sends out the power supply method gives lord CPU
The beginning of DS18 B20 starts to turn. (1) place data line first Gao Dian Ping\
(2) postpone(what the time request isn't very strict, but possibly a little bit shorter) (3) the data line pull a low electricity even\
(4) postpone 750.(the horary time scope can from 480-960) (5) the data line pull Gao Dian Ping\
(6) wait for while postponing(if is early to start to become an achievement then in 15-60 time inside produce a low electricity that is returned by the DS18 B20 even\make sure its existence according to the status, but should notice can not be infinitely carry on waiting for, otherwise will make procedure get into to die circulating, so control while wanting to carry on to be super).
(7) if CPU read the data is on-line low to give or get an electric shock even\also needing to do to postpone time for it to postpones from send out of Gao Dian Ping start to calculate to at least want 480.
(8) pull data line again Gao Dao Gao to end after giving or getting an electric shock is even\
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DS-18B20 数字温度传感器
DS-18B20数字温度传感器，该产品采用美国DALLAS公司生产的 DS18B20可组网数字温度传感器芯片封装而成，具有耐磨耐碰，体积小，使用方便，封装形式多样，适用于各种狭小空间设备数字测温和控制领域。
1、技术性能描述：
1.1 独特的单线接口方式，DS18B20在与微处理器连接时仅需要一条口线即可实现微处理器与DS18B20的双向通讯。
1.2 测温范围 －55℃～＋125℃，固有测温分辨率0.5℃。
1.3 支持多点组网功能，多个DS18B20可以并联在唯一的三线上，最多只能并联8个，如果数量过多，会使供电电源电压过低，从而造成信号传输的不稳定，实现多点测温 1.4 工作电源: 3~5V/DC
1.5 在使用中不需要任何外围元件
1.6 测量结果以9~12位数字量方式串行传送 1.7 不锈钢保护管直径 Φ6
1.8 适用于DN15~25, DN40~DN250各种介质工业管道和狭小空间设备测温 1.9 标准安装螺纹 M10X1, M12X1.5, G1/2任选
1.10 PVC电缆直接出线或德式球型接线盒出线,便于与其它电器设备连接。
2、应用范围：
2.1 该产品适用于冷冻库，粮仓，储罐，电讯机房，电力机房，电缆线槽等测温和控制领域
2.2 轴瓦，缸体，纺机，空调，等狭小空间工业设备测温和控制。 2.3 汽车空调、冰箱、冷柜、以及中低温干燥箱等。
2.4 供热/制冷管道热量计量，中央空调分户热能计量和工业领域测温和控制
3、产品型号与规格：
型 号 测温范围 安装螺纹 电缆长度 适用管道 TS-18B20 -55~125 无 1.5 m
TS-18B20A -55~125 M10X1 1.5m DN15~25
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