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DS1720 Datasheet

  • DS1720

  • Econo-Digital Thermometer and Thermostat

  • Dallas   Dallas

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DS1720
PRELIMINARY
DS1720
Econo 鈥?Digital Thermometer and
Thermostat
FEATURES
PIN ASSIGNMENT
DQ
CLK/CONV
RST
GND
1
2
3
4
8
7
6
5
V
DD
T
HIGH
T
LOW
T
COM
鈥?/div>
Requires no external components
鈥?/div>
Supply voltage range covers from 2.7V to 5.5V
鈥?/div>
Measures
temperatures from 鈥?5擄C to +125擄C in
0.5擄C increments. Fahrenheit equivalent is 鈥?7擄F to
+257擄F in 0.9擄F increments
鈥?/div>
Temperature is read as a 9鈥揵it value
鈥?/div>
Converts
(max)
temperature to digital word in 1 second
DQ
CLK/CONV
DS1720S 8鈥揚(yáng)IN SOIC (208 MIL)
See Mech Drawings Section
PIN DESCRIPTION
鈥?3鈥揥ire Input/Output
鈥?3鈥揥ire Clock Input and
Stand鈥揳lone
Convert Input
鈥?3鈥揥ire Reset Input
鈥?Ground
鈥?High Temperature Trigger
鈥?Low Temperature Trigger
鈥?High/Low Combination Trigger
鈥?Power Supply Voltage (3V 鈥?5V)
鈥?/div>
Thermostatic settings are user鈥揹efinable and non鈥?/div>
volatile
鈥?/div>
Data is read from/written via a 3鈥搘ire serial interface
(CLK, DQ, RST)
鈥?/div>
Applications include thermostatic controls, industrial
systems, consumer products, thermometers, or any
thermally sensitive system
鈥?/div>
8鈥損in SOIC (208 mil) package
RST
GND
T
HIGH
T
LOW
T
COM
V
DD
DESCRIPTION
The DS1720 Digital Thermometer and Thermostat pro-
vides 9鈥揵it temperature readings which indicate the
temperature of the device. With three thermal alarm out-
puts, the DS1720 can also act as a thermostat. T
HIGH
is
driven high if the DS1720鈥檚 temperature is greater than
or equal to a user鈥揹efined temperature TH. T
LOW
is
driven high if the DS1720鈥檚 temperature is less than or
equal to a user鈥揹efined temperature TL. T
COM
is driven
high when the temperature exceeds TH and stays high
until the temperature falls below that of TL.
User鈥揹efined temperature settings are stored in non鈥?/div>
volatile memory, so parts can be programmed prior to
insertion in a system, as well as used in stand鈥揳lone
applications without a CPU. Temperature settings and
temperature readings are all communicated to/from the
DS1720 over a simple 3鈥搘ire interface.
030598 1/12

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