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參數(shù)資料
| 型號： | DS1620R |
| 廠商： | DALLAS SEMICONDUCTOR |
| 元件分類： | Switch/Digital Output Temperature Sensor |
| 英文描述： | DIGITAL TEMP SENSOR-SERIAL, 9BIT(s), RECTANGULAR, SURFACE MOUNT |
| 封裝： | 0.300 INCH, SO-16 |
| 文件頁數(shù)： | 7/11頁 |
| 文件大?。?/td> | 17247K |
| 代理商： | DS1620R |
DS1620R
5 of 11
102099
device. This feature provides a method of determining if the DS1620 has ever been subjected to
temperatures below TL while power has been applied.
NVB
= Nonvolatile Memory Busy Flag. This bit will be a 1 while a write to E2 memory is in
progress; 0=nonvolatile memory not busy. A write to E2 memory typically takes 10 ms, but may take up
to 50 ms at high temperatures.
CPU
= CPU use bit. If CPU=0, the CLK/CONV pin acts as a conversion start control when RST is
low. If CPU is 1, the DS1620 will be used with a CPU communicating to it over the 3–wire port and the
operation of the CLK/CONV pin is as a normal clock in concert with DQ and RST. This bit is stored in
nonvolatile E2 memory, capable of at least 50,000 writes.
1SHOT = One–Shot Mode. If 1SHOT is 1, the DS1620 will perform one temperature conversion upon
reception of the Start Convert T protocol. If 1SHOT is 0, the DS1620 will continuously perform
temperature conversion. This bit is stored in nonvolatile E2 memory, capable of at least 50,000 writes.
For typical thermostat operation, the DS1620R will operate in continuous mode. However, for
applications where only one reading is needed at certain times or to conserve power, the one–shot mode
may be used. Note that the thermostat outputs (THIGH, TLOW, TCOM) will remain in the state they were in
after the last valid temperature conversion cycle when operating in one–shot mode.
OPERATION IN STAND–ALONE MODE
In applications where the DS1620R is used as a simple thermostat, no CPU is required save for
programming the temperature limits. Since the temperature limits are nonvolatile, the DS1620R may be
programmed prior to insertion in the system. In order to facilitate operation without a CPU, the
CLK/CONV pin (pin 2) may be used to initiate conversions. Note that the CPU bit must be set to 0 in the
configuration register to use this mode of operation.
To use the CLK/CONV pin to initiate conversions, RST must be low and CLK/CONV must be high. If
CLK/ CONV is driven low and then brought high in less than 10 ms, one temperature conversion will be
performed and then the DS1620 will return to an idle state. If CLK/ CONV is driven low and remains
low, continuous con-versions will take place until CLK/CONV is brought high again. With the CPU bit
set to 0, the CLK/CONV will override the 1 SHOT bit if it is equal to 1. This means that even if the part
is set for one–shot mode, driving CLK/ CONV low will initiate conversions.
INTERNAL RESISTOR
The internal 50-ohm resistor is connected between pins RA and RB. A typical application will use this
resistor connected between 5V and ground, providing a 500-mW power dissipation in the resistor. In still
air this will cause an approximately 40
°C temperature rise in the DS1620R. Under other airflow
conditions this temperature rise will be different, giving some indication as to how much heat is
conducted away from the device by the airflow. The actual temperature rise and thermostat settings for
use in a particular system will therefore be dictated by the system’s design and protection requirements
and must be characterized by the user.
Because the DS1620R measures the actual die temperature of the device, its measurement range is from
-55
°C to +125°C; however, since the internal resistor is causing a temperature rise in the device, the
entire DS1620R is rated for operation in ambient temperatures of –40
°C to +85°C only.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS1620S | 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 |
| DS1620S/T&R | 制造商:Maxim Integrated Products 功能描述:DIGITAL THERM. 8P SO 208M TRL - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC THERMOMETER/STAT DIG 8-SOIC |
| DS1620S/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 |
| DS1620S+ | 功能描述:板上安裝溫度傳感器 Digital Thermometer & Thermostat 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 |
| DS1620S+T&R | 制造商:Maxim Integrated Products 功能描述:TEMP SENSOR DGTL 3-WIRE 8SOIC - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC THERMOMETER/STAT DIG 8-SOIC 制造商:Maxim Integrated Products 功能描述:Board Mount Temperature Sensors Digital Thermometer & Thermostat |
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