參數(shù)資料
型號(hào): DS1620S
元件分類: 溫度傳感器
英文描述: IC-SM-DIGITAL THERMOMETER
中文描述: 集成電路釤數(shù)字溫度計(jì)
文件頁(yè)數(shù): 3/13頁(yè)
文件大小: 539K
代理商: DS1620S
DS1620
3 of 13
TEMPERATURE MEASURING CIRCUITRY
Figure 2
This calculation is done inside the DS1620 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 temperature. The data is transmitted serially
through the 3–wire serial interface, LSB first. The DS1620 can measure temperature over the range of
-55
°
C to +125
°
C in 0.5
°
C increments. For Fahrenheit usage, a lookup table or conversion factor must be
used.
TEMPERATURE/DATA RELATIONSHIPS
Table 1
TEMP
DIGITAL OUTPUT
(Binary)
+125°C
0 11111010
+25°C
0 00110010
+°C
0 00000001
+0°C
0 00000000
-°C
1 11111111
-25°C
1 11001110
-55°C
1 10010010
DIGITAL OUTPUT
(Hex)
00FA
0032h
0001h
0000h
01FFh
01CEh
0192h
Since data is transmitted over the 3–wire bus LSB first, temperature data can be written to/read from the
DS1620 as either a 9–bit word (taking
RST
low after the 9
th
(MSB) bit), or as two transfers of 8–bit
SLOPE ACCUMULATOR
PRESET
COMPARE
LOW TEMPERATURE
COEFFICIENT OSCILLATOR
COUNTER
PRESET
=0
TEMPERATURE REGISTER
HIGH TEMPERATURE
COEFFICIENT OSCILLATOR
COUNTER
=0
INC
STOP
SET/CLEAR
LSB
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