DS1621
Digital Thermometer and Thermostat

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The DS1621 Digital Thermometer and Thermostat provides 9–bit temperature readings which indicate the temperature of the device. The thermal alarm output, TOUT, is active when the temperature of the device exceeds a user–defined temperature TH. The output remains active until the temperature drops below user defined temperature TL, allowing for any hysteresis necessary.

User-defined temperature settings are stored in nonvolatile memory so parts may be programmed prior to insertion in a system. Temperature settings and temperature readings are all communicated to/from the DS1621 over a simple two–wire serial interface.

Voltage on Any Pin Relative to Ground                   –0.5V to +7.0V
Operating Temperature                                          –55°C to +125°C
Storage Temperature                                             –55°C to +125°C
Soldering Temperature                                            260°C for 10 seconds
● Temperature measurements require no external components
Measures temperatures from –55°C to +125°C in 0.5°C increments. Fahrenheit equivalent is –67°F to 257°F      in 0.9°F increments
Temperature is read as a 9–bit value (2- byte transfer)
Wide power supply range (2.7V to 5.5V)
Converts temperature to digital word in 1 second
Thermostatic settings are user definable and nonvolatile
Data is read from/written via a two–wire serial interface (open drain I/O lines)
Applications include thermostatic controls, industrial systems, consumer products, thermometers, or any thermal
    sensitive system
8–pin DIP or SOIC package (150-MIL and 208-MIL)

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Datasheet

Size: 647.5KB
Page: 16
PDF: DS1621.pdf
  • Description:
    Digital Thermometer and Thermostat
  • MFG:
    DALLAS [Dallas Semiconducotr]
 

Abstract


1 of 16 102299
FEATURES
§ Temperature measurements require no
external components
§ Measures temperatures from –55°C to
+125°C in 0.5°C increments. Fahrenheit
equivalent is –67°F to 257°F in 0.9°F
increments
§ Temperature is read as a 9–bit value (2-
byte transfer)
§ Wide power supply range (2.7V to 5.5V)
§ Converts temperature to digital word in 1
second
§ Thermostatic settings are user definable
and nonvolatile
§ Data is read from/written via a two–wire
serial interface (open drain I/O lines)
§ Applications include thermostatic
controls, industrial systems, consumer
products, thermometers, or any thermal
sensitive system
§ 8–pin DIP or SOIC package (150-MIL and
208-MIL)
PIN ASSIGNMENT
PIN DESCRIPTION
SDA - 2-Wire Serial Data Input/Output
SCL - 2-Wire Serial Clock
GND - Ground
TOUT - Thermostat Output Signal
A0 - Chip Address Input
A1 - Chip Address Input
A2 - Chip Address Input
VDD - Power Supply Voltage
DESCRIPTION
The DS1621 Digital Thermometer and Thermostat provides 9–bit temperature readings which indicate
the temperature of the device. The thermal alarm output, TOUT, is active when the temperature of the
device exceeds a user–defined temperature TH. The output remains active until the temperature drops
below user defined temperature TL, allowing for any hysteresis necessary.
User-defined temperature settings are stored in nonvolatile memory so parts may be programmed prior to
insertion in a system. Temperature settings and temperature readings are all communicated to/from the
DS1621 over a simple two–wire serial interface.
DS1621
Digital Thermometer and Thermostat
www.dalsemi.com
63
1
2
4
8
7
5
SDA
TOUT
GND
VDD
A0
A1
A2
DS1621S 8-PIN SOIC (150-MIL)
DS1621V 8-PIN SOIC (208-MIL)
See Mech Drawings Section
63
1
2
4
8
7
5
SDA
SCL
TOUT
GND
VDD
A0
A1
A2
DS1621 8-PIN DIP (300-MIL)
See Mech Drawings Section
SCL

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