基于單片機(jī)溫度監(jiān)測(cè)系統(tǒng)設(shè)計(jì)的外文翻譯(參考版)
2024-11-27 01:33本頁(yè)面
【正文】 Target 139。 (3) VDD for external power supplies input (in parasitic power connection mode grounding). 14 internal structure 3. Debug simulation Proteus is Labeenter electronics pany research UK EDA software. Proteus is not only the analog and digital circuit, d/a hybrid circuit design and simulation platform, but also is currently the world39。t work normally. DS18B20 Appearance and internal structure: DS18B20 internal structure consists mainly of four parts: 64bit photolithography ROM, temperature sensors, nonvolatile temperature alarm triggers TH TL, configuration and registers. DS18B20 tube feet 第 7 頁(yè) arrangement is “ 13”， internal structure is“ 14” 13 DS18B20 tube feet arrangement (1) DQ for digital signal input/output terminal。 (5) negative pressure characteristics: power at the polarity, thermometers won39。 (3) programmable resolution for the 9 ~ 12, the corresponding can distinguish respectively ℃ , the temperature of ℃ and ℃ , by ℃ 。 C for + . Optional smaller encapsulation way, more wide voltage range. Resolution setting, and users set alarm temperature EEPROM, stored in power lost and still save. DS18B20 performance is the best product of new generation! Performance to price also is very good! DS18B20 New performance: (1) data available supply, voltage range: ~ V。 C range, precision 176。 C ~ + 125 176。s sake. RST: reset input. When oscillator reset device to keep RST feet high level two machine cycle time. ALE/PROG: when access external storage, address latch allows the output level of the position for latch address byte. During the FLASH programming, this pin for input programming pulse. In peacetime, the ALE with a constant frequency cycle output is the pulse signal, the frequencies of the 1/6 oscillator frequency. So it can be used against external output pulse or used for timing purpose. However it is: whenever used for external data storage, will skip a ALE pulse. If you want to ban the ALE output can be in SFR8EH address for 0. At this time, only by performing the ALE MOVX, MOVC instruction is ALE to take effect. In addition, the pins were slightly up. If microprocessor in external execution ALE, buy a ban is invalid. / PSEN: external program memory choice of munication number. By external program memory in during the instruction fetch, each machine cycle twice /PSEN effective. But on a visit to external data storage, the two effective/PSEN signals will not appear. / EA/VPP: when/EA keep low levels in this period, the external program memory (0000H FFFFH), whether have internal program memory. Note encryption method 1, / EA will RESET for internal focus。 low power consumption of idle and power lost mode 5 interrupt source 32 programmable I/O lines level 3 program memory lock data retention time: 10 years 4K bytes programmable FLASH memory four DS1820 connected to MCU respectively, this scheme four IO mouth occupy MCU four IO though, but the microcontroller IO mouth under the condition of mouth not shortage by this s
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