參數(shù)資料
型號(hào)： DS18B20P
廠商： DALLAS SEMICONDUCTOR
元件分類： Switch/Digital Output Temperature Sensor
英文描述： DIGITAL TEMP SENSOR-SERIAL, 12BIT(s), 0.50Cel, RECTANGULAR, SURFACE MOUNT
封裝： TSOC-6
文件頁(yè)數(shù)： 22/26頁(yè)
文件大?。?/td> 387K
代理商： DS18B20P
DS18B20
5 of 26
OPERATION - MEASURING TEMPERATURE
The core functionality of the DS18B20 is its direct-to-digital temperature sensor. The resolution of the
DS18B20 is configurable (9, 10, 11, or 12 bits), with 12-bit readings the factory default state. This
equates to a temperature resolution of 0.5
°C, 0.25°C, 0.125°C, or 0.0625°C. Following the issuance of
the Convert T [44h] command, a temperature conversion is performed and the thermal data is stored in
the scratchpad memory in a 16-bit, sign-extended two’s complement format. The temperature
information can be retrieved over the 1-Wire interface by issuing a Read Scratchpad [BEh] command
once the conversion has been performed. The data is transferred over the 1-Wire bus, LSB first. The
MSB of the temperature register contains the “sign” (S) bit, denoting whether the temperature is positive
or negative.
Table 2 describes the exact relationship of output data to measured temperature. The table assumes 12-bit
resolution. If the DS18B20 is configured for a lower resolution, insignificant bits will contain zeros. For
Fahrenheit usage, a lookup table or conversion routine must be used.
Temperature/Data Relationships Table 2
2
3
2
1
2
0
2
-1
2
-2
2
-3
2
-4
LSB
MSb
(unit =
°C)
LSb
SS
S
2
6
2
5
2
4
MSB
TEMPERATURE
DIGITAL OUTPUT
(Binary)
DIGITAL
OUTPUT
(Hex)
+125°C
0000 0111 1101 0000
07D0h
+85°C
0000 0101 0101 0000
0550h*
+25.0625°C
0000 0001 1001 0001
0191h
+10.125°C
0000 0000 1010 0010
00A2h
+0.5°C
0000 0000 0000 1000
0008h
0°C
0000 0000 0000 0000
0000h
-0.5°C
1111 1111 1111 1000
FFF8h
-10.125°C
1111 1111 0101 1110
FF5Eh
-25.0625°C
1111 1110 0110 1111
FF6Fh
-55°C
1111 1100 1001 0000
FC90h
*The power on reset register value is +85°C.
OPERATION - ALARM SIGNALING
After the DS18B20 has performed a temperature conversion, the temperature value is compared to the
trigger values stored in TH and TL. Since these registers are 8-bit only, bits 9-12 are ignored for
comparison. The most significant bit of TH or TL directly corresponds to the sign bit of the 16-bit
temperature register. If the result of a temperature measurement is higher than TH or lower than TL, an
alarm flag inside the device is set. This flag is updated with every temperature measurement. As long as
the alarm flag is set, the DS18B20 will respond to the alarm search command. This allows many
DS18B20s to be connected in parallel doing simultaneous temperature measurements. If somewhere the
temperature exceeds the limits, the alarming device(s) can be identified and read immediately without
having to read non-alarming devices.
相關(guān)PDF資料
PDF描述
DS18B20X DIGITAL TEMP SENSOR-SERIAL, 12BIT(s), 2Cel, RECTANGULAR, SURFACE MOUNT
DS18B20Z DIGITAL TEMP SENSOR-SERIAL, 12BIT(s), 0.50Cel, RECTANGULAR, SURFACE MOUNT
DS18B20 DIGITAL TEMP SENSOR-SERIAL, 12BIT(s), 0.50Cel, RECTANGULAR, THROUGH HOLE MOUNT
DS18B20U+T&R DIGITAL TEMP SENSOR-SERIAL, 12BIT(s), 0.50Cel, SQUARE, SURFACE MOUNT
DS18B20-SL+T&R DIGITAL TEMP SENSOR-SERIAL, 12BIT(s), 0.50Cel, RECTANGULAR, THROUGH HOLE MOUNT
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
DS18B20-PAR 功能描述:板上安裝溫度傳感器 RoHS:否 制造商:Omron Electronics 輸出類型:Digital 配置: 準(zhǔn)確性:+/- 1.5 C, +/- 3 C 溫度閾值: 數(shù)字輸出 - 總線接口:2-Wire, I2C, SMBus 電源電壓-最大:5.5 V 電源電壓-最小:4.5 V 最大工作溫度:+ 50 C 最小工作溫度:0 C 關(guān)閉: 安裝風(fēng)格: 封裝 / 箱體: 設(shè)備功能:Temperature and Humidity Sensor
DS18B20-PAR/T&R 功能描述:板上安裝溫度傳感器 RoHS:否 制造商:Omron Electronics 輸出類型:Digital 配置: 準(zhǔn)確性:+/- 1.5 C, +/- 3 C 溫度閾值: 數(shù)字輸出 - 總線接口:2-Wire, I2C, SMBus 電源電壓-最大:5.5 V 電源電壓-最小:4.5 V 最大工作溫度:+ 50 C 最小工作溫度:0 C 關(guān)閉: 安裝風(fēng)格: 封裝 / 箱體: 設(shè)備功能:Temperature and Humidity Sensor
DS18B20-PAR_07 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:1-Wire Parasite-Power Digital Thermometer
DS18B20-PAR+T&R 制造商:Maxim Integrated Products 功能描述: 制造商:Maxim Integrated Products 功能描述:TEMP SENSOR DGTL 1-WIRE 3PIN TO-92 - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC THERM MICROLAN PROG-RES TO-92 制造商:Maxim Integrated Products 功能描述:Board Mount Temperature Sensors Prgmble Resolution 1-Wire Parasite Pwr
DS18B20-PAR+T&R 功能描述:板上安裝溫度傳感器 Prgmble Resolution 1-Wire Parasite Pwr RoHS:否 制造商:Omron Electronics 輸出類型:Digital 配置: 準(zhǔn)確性:+/- 1.5 C, +/- 3 C 溫度閾值: 數(shù)字輸出 - 總線接口:2-Wire, I2C, SMBus 電源電壓-最大:5.5 V 電源電壓-最小:4.5 V 最大工作溫度:+ 50 C 最小工作溫度:0 C 關(guān)閉: 安裝風(fēng)格: 封裝 / 箱體: 設(shè)備功能:Temperature and Humidity Sensor
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