DS18B20 / DS1822 온도 프로브 케이블

DS18B20/DS1822는 일반적으로 사용되는 디지털 온도 센서입니다.. 출력은 디지털 신호입니다., 작은 크기의 특징을 가지고 있는, 낮은 하드웨어 오버헤드, 강력한 간섭 방지 능력과 높은 정밀도. The DS18B20 digital temperature sensor is easy to wire and can be used in a variety of situations after being packaged, 파이프형과 같은, 스레드 유형, 자석흡착형, and stainless steel packaging type. 다양한 모델이 있어요, LTM8877 포함, LTM8874 등. As a digital temperature sensor, the DS18B20 does not require any external components when measuring temperature. It can directly output the measured temperature value of 9~12 bits (including sign bit). The temperature measurement range is -55~+125℃. The measurement accuracy is ±0.5℃ in the range of -10~+85℃, and the output measurement resolution is adjustable, up to 0.0625℃. Supporting "single-wire bus" 기술, only one general-purpose I/O port is required to complete communication with the microcontroller. The on-site temperature is directly transmitted digitally via a "single-wire bus", which greatly improves the system's anti-interference capability.

DS18B20, DS1822 "One-line bus" digital temperature sensor Same as DS1820. DS18B20 also supports "한 번 버스" 인터페이스, and the measurement temperature range is -55°C~+125°C, and the accuracy is ±0.5°C in the range of -10~+85°C. The accuracy of the DS1822 is ±2°C. The on-site temperature is directly transmitted digitally via the "한 번 버스", which greatly improves the system's anti-interference capability. Suitable for on-site temperature measurement in harsh environments, such as environmental control, equipment or process control, temperature measurement consumer electronics, 등. The new product supports a voltage range of 3V~5.5V, making system design more flexible and convenient. And the new generation of products is cheaper and smaller. Features of DS18B20 and DS1822 DS18B20 can be programmed with a resolution of 9~12 bits and an accuracy of ±0.5°C. Optional smaller package, wider voltage range. The resolution setting and the user-set alarm temperature are stored in EEPROM and are still saved after power off. The performance of DS18B20 is the best among the new generation products! The price-performance ratio is also excellent! The DS1822 is software compatible with the DS18B20 and is a simplified version of the DS18B20. The EEPROM that stores user-defined alarm temperature and resolution parameters is omitted, and the accuracy is reduced to ±2°C. It is suitable for applications with low performance requirements and strict cost control. It is an economical product. Following the early products of the "One Line Bus", the DS1820 opens up a new concept in temperature sensor technology. DS18B20 and DS1822 provide more choices in voltage, characteristics and packaging, allowing us to build an economical temperature measurement system that suits us.

Internal structure of ds18b20 temperature probe
The internal structure of DS18B20 mainly consists of four parts:
64-비트 포토 리소그래피 롬, 온도 센서, non-volatile temperature alarm trigger TH and TL, configuration register.
The pin arrangement of DS18B20 is as follows
DQ는 디지털 신호 입력/출력 터미널입니다; GND는 전력 접지입니다; VDD is the external power supply input terminal (기생 전원 배선 모드에서 접지됨).
The 64-bit serial number in the photo etched ROM is photo etched before leaving the factory. DS18B20의 주소 직렬 코드로 간주 될 수 있습니다.. 64 비트 포토 리소그래피 ROM의 배열은 다음과 같습니다: 첫 번째 8 비트 (28시간) 제품 유형 번호입니다, the next 48 비트는 DS18B20 자체의 일련 번호입니다, and the last 8 bits are the previous 56-bit cyclic redundancy check code (CRC=X8 +X5+X4+1). The purpose of the photolithography ROM is to make each DS18B20 different, 여러 DS18B20을 하나의 버스에 연결할 수 있습니다..
DS18B20의 온도 센서는 온도 측정을 완료 할 수 있습니다.. 예를 들어 12 비트 변환을 취하십시오: it is provided in the form of a 16-bit sign-extended two's complement reading, 0.0625 ° C/LSB의 형태로 표현됩니다, 여기서 s는 부호 비트입니다.
이것은 12 비트 변환 후 얻은 12 비트 데이터입니다, 18b20의 8 비트 램에 저장됩니다. 첫 번째 5 bits in binary are sign bits if the measured temperature is greater than 0. 이것들 5 비트는 0. 측정된 값에 곱하기만 하면 됩니다. 0.0625 실제 온도를 얻으려면. 온도가 이하인 경우 0, 이것들 5 비트는 1, 측정된 값을 반전시켜야 합니다., ...을 더한 1, 그리고 나서 0.0625 실제 온도를 얻으려면.
예를 들어, +125℃의 디지털 출력은 07D0H입니다., +25.0625℃의 디지털 출력은 0191H입니다., -25.0625℃의 디지털 출력은 FE6FH입니다., -55℃의 디지털 출력은 FC90H입니다..

External digital temperature sensor

DS18B20 Temperature Sensor with USB Connector

DS18B20 온도 센서 방수 프로브 와이어 하네스

DS18B20 temperature sensor memory
The internal memory of the DS18B20 temperature sensor includes a high-speed scratchpad RAM and a non-volatile electrically erasable E2RAM, which stores high-temperature and low-temperature triggers TH, TL 및 구조 레지스터.
The temporary storage memory contains 8 consecutive bytes, the first two bytes are the measured temperature information. The content of the first byte is the lower eight bits of the temperature. The second byte is the high eight bits of the temperature. The third and fourth bytes are volatile copies of TH and TL, and the fifth byte is a volatile copy of the architectural register. The contents of these three bytes are refreshed at each power-on reset. The sixth, seventh, and eighth bytes are used for internal calculations. 아홉 번째 바이트는 중복 체크 바이트입니다.
The meaning of each bit of this byte is as follows:
TM R1 R0 1 1 1 1 1
하위 5비트는 항상 1. TM is the test mode bit, DS18B20이 작업 모드인지 테스트 모드인지 설정하는 데 사용됩니다.. 이 비트는 다음으로 설정됩니다. 0 DS18B20이 공장에서 출고될 때, 사용자는 이를 변경해서는 안 됩니다.. R1과 R0은 해상도를 설정하는 데 사용됩니다., 다음 표에 표시된 것처럼: (DS18B20이 다음으로 설정되었습니다. 12 공장에서 배송될 때의 비트)
Resolution setting table:
R1 R0 Resolution Temperature Maximum Conversion Time
0 0 9 bits 93.75ms
0 1 10 bits 187.5ms
1 0 11 bits 375ms
1 1 12 bits 750ms
DS18B20의 통신 프로토콜에 따르면, the host must go through three steps to control DS18B20 to complete the temperature conversion: DS18B20은 각 읽기 및 쓰기 전에 재설정해야합니다, and a ROM command is sent after the reset is successful. 마지막으로, the RAM command is sent so that the DS18B20 can be operated as scheduled. 재설정을 위해서는 메인 CPU가 데이터 라인을 아래로 당겨야 합니다. 500 마이크로초 후에 해제합니다.. After receiving the signal, DS18B20 waits for about 16 에게 60 마이크로초, 그런 다음 낮은 펄스를 보냅니다. 60 에게 240 마이크로초. 메인 CPU는 이 신호를 수신하여 성공적인 재설정을 나타냅니다..