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參數(shù)資料
| 型號： | DS18S20Z |
| 元件分類： | 溫度傳感器 |
| 英文描述： | High Precision 1-Wire Digital Thermometer |
| 中文描述： | 高精度1 - Wire數(shù)字溫度計 |
| 文件頁數(shù)： | 5/27頁 |
| 文件大?。?/td> | 136K |
| 代理商： | DS18S20Z |
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DS18S20
5 of 27
OPERATION – MEASURING TEMPERATURE
The core functionality of the DS18S20 is its direct-to-digital temperature sensor. The direct readout of
temperature data is 9 bits wide, equating to a resolution of 0.5
°
C; if higher resolution is desired, an
algorithm is described later in this section to achieve that need. 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. For Fahrenheit usage, a lookup table
or conversion routine must be used.
Temperature/Data Relationships
Table 2
2
6
2
5
2
4
2
3
2
2
2
1
2
0
2
-1
LSB
MSb
(unit =
°
C)
LSb
S
S
S
S
S
S
S
S
MSB
TEMPERATURE
DIGITAL OUTPUT
(Binary)
DIGITAL
OUTPUT
(Hex)
0550h*
00FAh
0032h
0001h
0000h
FFFFh
FFCEh
FF92h
+85°C
+125°C
+25.0°C
+0.5°C
0°C
-0.5°C
-25.0°C
-55°C
*The power on reset register value is +85°C
0000 0101 0101 0000
0000 0000 1111 1010
0000 0000 0011 0010
0000 0000 0000 0001
0000 0000 0000 0000
1111 1111 1111 1111
1111 1111 1100 1110
1111 1111 1001 0010
Higher resolutions may be obtained by the following procedure. First, read the temperature,
COUNT_REMAIN, and COUNT_PER_C registers from the scratchpad. Truncate the 0.5
°
C bit (the
LSB) from the temperature value. This value is TEMP_READ. The actual temperature may then be
calculated by using the following:
C
PER
COUNT
REMAIN
COUNT
_
C
PER
COUNT
READ
TEMP
E
TEMPERATUR
_
_
_
_
25
.
_
+
=
OPERATION – ALARM SIGNALING
After the DS18S20 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, the 0.5
°
C bit is 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
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS18S20Z/T&R | 制造商:Maxim Integrated Products 功能描述:HI PREC MICROLAN DIG THERM 8-SO T&R - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC THERM MICROLAN HI-PREC 8-SOIC |
| DS18S20Z/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 |
| DS18S20Z+ | 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 |
| DS18S20Z+T&R | 制造商:Maxim Integrated Products 功能描述:TEMP SENSOR DGTL 1-WIRE 8SOIC - Tape and Reel 制造商:Maxim Integrated Products 功能描述:HI PREC MICROLAN DIG THERM 8-SO T&R 制造商:Maxim Integrated Products 功能描述:IC THERM MICROLAN HI-PREC 8SOIC 制造商:Maxim Integrated Products 功能描述:IC THERM MICROLAN HI-PREC 8-SOIC 制造商:Maxim Integrated Products 功能描述:Board Mount Temperature Sensors Prgmble Resolution 1-Wire Parasite Pwr |
| DS18S20Z+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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