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參數資料
| 型號： | DS1821C+ |
| 廠商： | Maxim Integrated |
| 文件頁數： | 7/19頁 |
| 文件大小： | 793K |
| 描述： | IC THERMOMETER/STAT PROG 3-TO92 |
| 標準包裝： | 500 |
| 系列： | 1-Wire® |
| 功能： | 溫度計，恒溫計 |
| 傳感器類型： | 內部 |
| 感應溫度： | -55°C ~ 125°C |
| 精確度： | ±1°C |
| 拓撲： | 比較器，寄存器庫 |
| 輸出類型： | 數字 |
| 輸出警報： | 無 |
| 輸出風扇： | 無 |
| 電源電壓： | 2.7 V ~ 5.5 V |
| 工作溫度： | -55°C ~ 125°C |
| 安裝類型： | 通孔 |
| 封裝/外殼： | TO-226-3、TO-92-3 標準主體 |
| 供應商設備封裝： | TO-92-3 |
| 包裝： | 管件 |
DS1821
7 of 19
OPERATION THERMOSTAT
When the DS1821 is in thermostat mode (T/R ? = 1 in the status/configuration register), temperature
conversions are performed continuously beginning at power-up (regardless of the value of the 1SHOT
bit), and the DQ pin serves as the thermostat output. The DQ output will become active when the
temperature of the DS1821 exceeds the user-defined limit in the T
H
register, and will remain active until
the temperature drops below the user-defined limit in the T
L
register as illustrated in Figure 4. Thus, the
user can select T
H
and T
L
to provide the desired amount of thermostat output hysteresis.
The user-defined 8-bit centigrade trip-point values (T
H
and T
L
) must be stored in twos complement
format as shown in Figure 3. The sign bit (S) indicates if the temperature is positive or negative; for
positive numbers S = 0 and for negative numbers S = 1. The non-volatile T
H
and T
L
registers must be
programmed when the DS1821 is in 1-Wire mode as explained in the OPERATING MODES section of
this datasheet. The DS1821 can be temporarily switched from thermostat mode to 1-Wire mode to
change the T
H
and T
L
values as also explained in the OPERATING MODES section.
The polarity (i.e., the active state) of the DQ output is user-selectable with the nonvolatile POL bit in the
status/configuration register. DQ is active-high when POL = 1, and DQ is active-low when POL = 0.
Two bits in the status/configuration register, THF and TLF, provide additional thermostatic information.
The value of these bits is normally 0. The THF (temperature high flag) bit will be set to 1 if the measured
temperature is ever greater than the value in the T
H
register and will remain a 1 until the user rewrites the
bit with a 0. The TLF (temperature low flag) bit will be set to 1 if the temperature is ever lower than the
value in the T
L
register and will remain a 1 until the user rewrites the bit with a 0. These bits provide a
record of the device temperature relative to the thermostat trip-points over a period of time. They are
stored in nonvolatile memory, so the data stored in THF and TLF can be analyzed after any number of
power cycles. The THF and TLF bits function in both 1-Wire and thermostat mode.
DQ OPERATION IN THERMOSTATE MODE Figure 4
STATUS/CONFIGURATION REGISTER
The status/configuration register provides information to the user about conversion status, EEPROM
activity and thermostat activity. It also allows the user to program various DS1821 options such as
power-up operating mode, thermostat output polarity and conversion mode. The status/configuration
register is arranged as shown in Figure 5 and detailed descriptions of each bit are provided in Table 3.
Note that the THF, TLF T/R ? POL and 1SHOT bits are stored in nonvolatile memory (EEPROM).
CONFIGURATION REGISTER Figure 5
i
i
i
i 4
i
i 2
i 1
i
DONE 1
NVB THF* TLF*
T/R ?
POL* 1SHOT*
Stored in EEPROM
T
Temp (癈)
D
Operating Mode = Thermostat
=
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相關代理商/技術參數 |
參數描述 |
|---|---|
| DS1821C+ | 功能描述:恒溫器 Programmable Digital Thermo-stat/monitor RoHS:否 制造商:Maxim Integrated 功能: 開路溫度: 閉合溫度: 準確性:+/- 1 C 溫度范圍:- 55 C to + 125 C 電流額定值:500 uA 電壓額定值:2.7 V to 5.5 V 產品:Thermostats |
| DS1821-C02 | 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: 準確性:+/- 1.5 C, +/- 3 C 溫度閾值: 數字輸出 - 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 關閉: 安裝風格: 封裝 / 箱體: 設備功能:Temperature and Humidity Sensor |
| DS1821-C04 | 制造商:DSC 功能描述: |
| DS1821S | 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: 準確性:+/- 1.5 C, +/- 3 C 溫度閾值: 數字輸出 - 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 關閉: 安裝風格: 封裝 / 箱體: 設備功能:Temperature and Humidity Sensor |
| DS1821S/T&R | 制造商:Maxim Integrated Products 功能描述:PROGRAM THERMOSTAT 208ML 8-SOIC T&R - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC THERMOMETER/STAT PROG 8-SOIC |
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