參數(shù)資料
型號(hào)： DS18S20
廠商： DALLAS SEMICONDUCTOR
元件分類： 溫度/濕度傳感器
英文描述： High Precision 1-Wire Digital Thermometer(高精度1線數(shù)字溫度計(jì))
中文描述： DIGITAL TEMP SENSOR-SERIAL, 9BIT(s), 0.50Cel, ROUND, THROUGH HOLE MOUNT
封裝： TO-92, 3 PIN
文件頁(yè)數(shù)： 3/21頁(yè)
文件大?。?/td> 150K
代理商： DS18S20
DS18S20
3 of 21
OPERATION – MEASURING TEMPERATURE
The core functionality of the DS18S20 is its direct-to-digital temperature sensor. The temperature sensor
output has 9-bit resolution, which corresponds to 0.5
°
C steps. The DS18S20 powers-up in a low-power
idle state; to initiate a temperature measurement and A-to-D conversion, the master must issue a Convert
T [44h] command. Following the conversion, the resulting thermal data is stored in the 2-byte
temperature register in the scratchpad memory and the DS18S20 returns to its idle state. If the DS18S20
is powered by an external supply, the master can issue “read time slots” (see the 1-WIRE BUS SYSTEM
section) after the Convert T command and the DS18S20 will respond by transmitting 0 while the
temperature conversion is in progress and 1 when the conversion is done. If the DS18S20 is powered
with parasite power, this notification technique cannot be used since the bus must be pulled high by a
strong pullup during the entire temperature conversion. The bus requirements for parasite power are
explained in detail in the POWERING THE DS18S20 section of this datasheet.
The DS18S20 output data is calibrated in degrees centigrade; for Fahrenheit applications, a lookup table
or conversion routine must be used. The temperature data is stored as a 16-bit sign-extended two’s
complement number in the temperature register (see Figure 2). The sign bits (S) indicate if the
temperature is positive or negative: for positive numbers S = 0 and for negative numbers S = 1. Table 2
gives examples of digital output data and the corresponding temperature reading.
Resolutions greater than 9 bits can be calculated using the data from the temperature, COUNT REMAIN
and COUNT PER °C registers in the scratchpad. Note that the COUNT PER °C register is hard-wired to
16 (10h). After reading the scratchpad, the TEMP_READ value is obtained by truncating the 0.5
°
C bit
(bit 0) from the temperature data (see Figure 2). The extended resolution temperature can then be
calculated using the following equation:
C
PER
COUNT
REMAIN
COUNT
_
C
PER
COUNT
READ
TEMP
E
TEMPERATUR
_
_
_
_
25
.
_
+
=
Additional information about high-resolution temperature calculations can be found in Application Note
105: “High Resolution Temperature Measurement with Dallas Direct-to-Digital Temperature Sensors”.
TEMPERATURE REGISTER FORMAT
Figure 2
bit 7
bit 6
bit 5
bit 4
LS Byte
2
6
2
5
2
4
2
3
bit 3
2
2
bit 2
2
1
bit 1
2
0
bit 0
2
-1
bit 15
S
bit 14
S
bit 13
S
bit 12
S
bit 11
S
bit 10
S
bit 9
S
bit 8
S
MS Byte
TEMPERATURE/DATA RELATIONSHIP
Table 2
TEMPERATURE
DIGITAL OUTPUT
(Binary)
0000 0000 1010 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
DIGITAL OUTPUT
(Hex)
00AAh
0032h
0001h
0000h
FFFFh
FFCEh
FF92h
+85.0°C*
+25.0°C
+0.5°C
0°C
-0.5°C
-25.0°C
-55.0°C
*The power-on reset value of the temperature register is +85°C
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
DS18S20/T&R 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述:IC THERM MICROLAN HI PREC TO-92
DS18S20/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
DS18S20+ 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
DS18S20+PAR 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
DS18S20+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 HI-PREC TO-92 制造商:Maxim Integrated Products 功能描述:Board Mount Temperature Sensors Prgmble Resolution 1-Wire Parasite Pwr
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