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| 型號(hào)： | DS75LV |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Digital Thermometer and Thermostat |
| 中文描述： | 低電壓數(shù)字溫度傳感器 |
| 文件頁(yè)數(shù)： | 6/13頁(yè) |
| 文件大?。?/td> | 290K |
| 代理商： | DS75LV |
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DS75LV: Digital Thermometer and Thermostat
6 of 13
OPERATION
The DS75LV thermostat has two operating modes, comparator mode and interrupt mode, which activate and
deactivate the open-drain thermostat output (O.S.) based on user-programmable trip-points (T
OS
and T
HYST
). The
DS75LV powers up with the thermostat in comparator mode, active-low O.S. polarity, over-temperature trip-point
(T
OS
) register set to 80C, and the hystoresis trip-point (T
HYST
) register set to 75C. If these power-up settings are
compatible with the application, the DS75LV can be used as a standalone thermostat (i.e., no 2–wire
communication required). If interrupt mode operation, active-high O.S. polarity or different T
OS
and T
HYST
values are
desired, they must be programmed after power-up, so standalone operation is not possible.
THERMOSTAT
In both operating modes, the user can program the thermostat fault tolerance, which sets how many consecutive
temperature readings (1, 2, 4, or 6) must fall outside of the thermostat limits before the thermostat output is
triggered. The fault tolerance is set by the F1 and F0 bits in the configuration register. At power-up the fault
tolerance is set to 1.
The data format of the T
OS
and T
HYST
registers is identical to that of the temperature register (see Figure 3), i.e., a
two-byte two’s complement representation of the trip-point temperature in degrees centigrade with bits 3 through 0
hardwired to 0. After every temperature conversion, the measurement is compared to the values stored in the T
OS
and T
HYST
registers. The O.S. output is updated based on the result of the comparison and the operating mode of
the IC. The number of T
OS
and T
HYST
bits used during the thermostat comparison is equal to the conversion
resolution set by the R1 and R0 bits in the configuration register. For example, if the resolution is 9 bits, only the 9
MSbs of T
OS
and T
HYST
will be used by the thermostat comparator.
The active state of the O.S. output can be changed via the POL bit in the configuration register. The power-up
default is active low.
If the user does not wish to use the thermostat capabilities of the DS75LV, the O.S. output should be left floating.
Note that if the thermostat is not used, the T
OS
and T
HYST
registers can be used for general storage of system data.
Comparator Mode:
When the thermostat is in comparator mode, O.S. can be programmed to operate with any
amount of hystoresis. The O.S. output becomes active when the measured temperature exceeds the T
OS
consecutive number of times as defined by the F1 and F0 fault tolerance (FT) bits in the configuration register. O.S.
then stays active until the first time the temperature falls below the value stored in T
HYST
. Putting the device into
shutdown mode does not clear O.S. in comparator mode. Thermostat comparator mode operation with FT = 2 is
illustrated in Figure 4.
Interrupt Mode:
In interrupt mode, the O.S. output first becomes active when the measured temperature exceeds
the T
OS
value a consecutive number of times equal to the FT value in the configuration register. Once activated,
O.S. can only be cleared by either putting the DS75LV into shutdown mode or by reading from any register
(temperature, configuration, T
OS
, or T
HYST
) on the device. Once O.S. has been deactivated, it will only be
reactivated when the measured temperature falls below the T
HYST
value a consecutive number of times equal to the
FT value. Again, O.S can only be cleared by putting the device into shutdown mode or reading any register. Thus,
this interrupt/clear process is cyclical between T
OS
and T
HYST
events (i.e, T
OS
, clear, T
HYST
, clear, T
OS
, clear, T
HYST
,
clear, etc.). Thermostat interrupt mode operation with FT = 2 is illustrated in Figure 4.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS75LV_0611 | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Digital Thermometer and Thermostat |
| DS75LVS | 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 |
| DS75LVS/T&R | 制造商:Maxim Integrated Products 功能描述:THE MAXIM DS75LVS/T&R IS A TEMPERATURE SENSOR. - Tape and Reel 制造商:Maxim Integrated Products 功能描述:Maxim DS75LVS/T&R, Digital Thermometer and thermostat -55C to +125C 1.7V-3.7V 8-pin SOIC |
| DS75LVS/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 |
| DS75LVS+ | 功能描述:板上安裝溫度傳感器 Low-Voltage Digital 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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