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DS18S20 其他数据使用手册 - Dallas Semiconductor（达拉斯半导体）
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DS18S20数据手册
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DS1820
021497 5/27
TEMPERATURE MEASURING CIRCUITRY Figure 4
SLOPE ACCUMULATOR
PRESET
PRESET
COUNTER
COUNTER
=0
=0
STOP
INC
COMPARE
TEMPERATURE REGISTER
LOW TEMPERATURE
COEFFICIENT OSCILLATOR
HIGH TEMPERATURE
COEFFICIENT OSCILLATOR
SET/CLEAR
LSB
TEMPERATURE/DATA RELATIONSHIPS Table 1
TEMPERATURE
DIGITAL OUTPUT
(Binary)
DIGITAL OUTPUT
(Hex)
+125°C 00000000 11111010 00FA
+25°C 00000000 00110010 0032h
+
1
/2
°C 00000000 00000001 0001h
+0°C 00000000 00000000 0000h
–
1
/
2
°C 11111111 11111111 FFFFh
–25°C 11111111 11001110 FFCEh
–55°C 11111111 10010010 FF92h
OPERATION – ALARM SIGNALING
After the DS1820 has performed a temperature conver-
sion, the temperature value is compared to the trigger
values stored in TH and TL. Since these registers are
8–bit only, the 0.5°C bit is ignored for comparison. The
most significant bit of TH or TL directly corresponds to
the sign bit of the 16–bit temperature register. If the
result of a temperature measurement is higher than TH
or lower than TL, an alarm flag inside the device is set.
This flag is updated with every temperature measure-
ment. As long as the alarm flag is set, the DS1820 will
respond to the alarm search command. This allows
many DS1820s to be connected in parallel doing simul-
taneous temperature measurements. If somewhere the
temperature exceeds the limits, the alarming device(s)
can be identified and read immediately without having to
read non–alarming devices.
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