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參數(shù)資料
| 型號： | DS1720 |
| 英文描述： | Econo . Digital Thermometer and Thermostat |
| 文件頁數(shù)： | 3/12頁 |
| 文件大?。?/td> | 77K |
| 代理商： | DS1720 |
DS1720
030598 3/12
TEMPERATURE MEASURING CIRCUITRY
Figure 2
SLOPE ACCUMULATOR
PRESET
PRESET
COUNTER
COUNTER
=0
=0
STOP
INC
COMPARE
TEMPERATURE REGISTER
LOW TEMPERATURE
COEFFICIENT OSCILLATOR
CHIGH TEMPERATURE
SET/CLEAR
LSB
This calculation is done inside the DS1720 to provide
0.5
°
C resolution. The temperature reading is provided
in a 9–bit, two’s complement reading by issuing a READ
TEMPERATURE command. Table 1 describes the
exact relationship of output data to measured tempera-
ture. The data is transmitted serially through the 3–wire
serial interface, LSB first. The DS1720 can measure
temperature over the range of –55
°
C to +125
°
C in 0.5
°
C
increments. For Fahrenheit usage, a lookup table or con-
version factor must be used.
TEMPERATURE/DATA RELATIONSHIPS
Table 1
DIGITAL
OUTPUT
(Binary)
TEMP
DIGITAL
OUTPUT
(Hex)
+85
°
C
+25
°
C
+
1/2
°
C
+0
°
C
–
1
/
2
°
C
–25
°
C
0 10101010
00AA
0 00110010
0032h
0 00000001
0001h
0 00000000
0000h
1 11111111
01FFh
1 11001110
01CEh
Since data is transmitted over the 3–wire bus LSB first,
temperature data can be written to/read from the
DS1720 as either a 9–bit word (taking RST low after the
9th (MSB) bit), or as two transfers of 8–bit words, with
the most significant 7 bits being ignored or set to zero,
as illustrated in Table 1. After the MSB, the DS1720 will
output 0s.
Note that temperature is represented in the DS1720 in
terms of a
1
/
2
°
C LSB, yielding the following 9–bit format:
X
X
X
X
X
X
X
1
1
1
0
0
1
1
1
0
MSB
LSB
T = –25
°
C
Higher resolutions may be obtained by reading the tem-
perature, and truncating the 0.5
°
C bit (the LSB) from the
read value. This value is TEMP_READ. The value left in
the counter may then be read by issuing a READ
COUNTER command. This value is the count remain-
ing (COUNT_REMAIN) after the gate period has
ceased. By loading the value of the slope accumulator
into the count register (using the READ SLOPE com-
mand), this value may then be read, yielding the number
of counts per degree C (COUNT_PER_C) at that tem-
perature. The actual temperature may be then be calcu-
lated by the user using the following:
TEMPERATURE = TEMP_READ – 0.25
(COUNT_PER_C – COUNT_REMAIN)
COUNT_PER_C
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS1720S | 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 |
| DS1720S/T&R | 制造商:Maxim Integrated Products 功能描述:DIGITAL THERMOMETER/THERMOSTAT T&R - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC THERMOMETER/STAT DIG 8-SOIC |
| DS1720S/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 |
| DS1720S+ | 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 |
| DS1720S+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 |
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