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參數(shù)資料
| 型號(hào)： | DS1775R/TR3 |
| 廠(chǎng)商： | DALLAS SEMICONDUCTOR |
| 元件分類(lèi)： | Switch/Digital Output Temperature Sensor |
| 英文描述： | DIGITAL TEMP SENSOR-SERIAL, 12BIT(s), 2Cel, RECTANGULAR, SURFACE MOUNT |
| 封裝： | SOT-23, 5 PIN |
| 文件頁(yè)數(shù)： | 6/13頁(yè) |
| 文件大小： | 201K |
| 代理商： | DS1775R/TR3 |
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DS1775
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The DS1775 is assembled in a compact SOT23–5 package allowing for low–cost thermal
monitoring/control in space–constrained applications. The low thermal mass allows for time constants
previously only possible with thermistors.
Applications for the DS1775 include personal computers/servers/workstations, cellular telephones, and
office equipment, or any thermally–sensitive system.
DETAILED PIN DESCRIPTION Table 1
PIN
SYMBOL
DESCRIPTION
PIN 1
SCL
Clock input/output pin for 2-wire serial communication port. This input should
be tied to GND for standalone thermostat operation.
PIN 2
GND
Ground pin.
PIN 3
O.S.
Thermostat output Open-drain output becomes active when temperature exceeds
TOS. Device configuration defines means to clear over-temperature state.
PIN 4
VDD
Supply Voltage 2.7V – 5.5V input power pin.
PIN 5
SDA
Data input/output pin for 2-wire serial communication port. In the standalone
thermostat mode, this input selects hysteresis.
OVERVIEW
A block diagram of the DS1775 is shown in Figure 1. The DS1775 consists of five major components:
1. Precision temperature sensor
2. Analog–to–digital converter
3. 2–wire interface electronics
4. Data registers
5. Thermostat comparator
The factory–calibrated temperature sensor requires no external components. Upon power–up, the DS1775
begins temperature conversions with the default resolution of 9 bits (0.5
°C resolution). The host can
periodically read the value in the temperature register, which contains the last completed conversion. As
conversions are performed in the background, reading the temperature register does not affect the
conversion in progress.
In power–sensitive applications the user can put the DS1775 into a shutdown mode, under which the sensor
will complete and store the conversion in progress and revert to a low–power standby state. In applications
where small incremental temperature changes are critical, the user can change the conversion resolution
from 9 bits to 10, 11, or 12. Each additional bit of resolution approximately doubles the conversion time.
This is accomplished by programming the configuration register. The configuration register defines the
conversion state, thermometer resolution/conversion time, active state of the thermostat output, number of
consecutive faults to trigger an alarm condition, and the method to terminate an alarm condition.
The user can also program over–temperature (TOS) and under–temperature (THYST) setpoints for
thermostatic operation. The power–up state of TOS is 80
°C and that for T
HYST is 75
°C. The result of each
temperature conversion is compared with the TOS and THYST setpoints. The DS1775 offers two modes for
temperature control, the comparator mode and the interrupt mode. This allows the user the flexibility to
customize the condition that would generate and clear a fault condition. Regardless of the mode chosen, the
O.S. output will become active only after the measured temperature exceeds the respective trippoint a
consecutive number of times; the number of consecutive conversions beyond the limit to generate an O.S. is
programmable. The power–up state of the DS1775 is in the comparator mode with a single fault generating
an active O.S.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS1775R-U | 功能描述:板上安裝溫度傳感器 RoHS:否 制造商:Omron Electronics 輸出類(lèi)型:Digital 配置: 準(zhǔn)確性:+/- 1.5 C, +/- 3 C 溫度閾值: 數(shù)字輸出 - 總線(xiàn)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 |
| DS1776 | 制造商:NSC 制造商全稱(chēng):National Semiconductor 功能描述:PI-Bus Transceiver |
| DS1776E/883 | 制造商:NSC 制造商全稱(chēng):National Semiconductor 功能描述:PI-Bus Transceiver |
| DS1776J/883 | 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Texas Instruments 功能描述: |
| DS1776W/883 | 制造商:未知廠(chǎng)家 制造商全稱(chēng):未知廠(chǎng)家 功能描述:Single 8-bit Bus Transceiver |
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