DS1621 Datasheet, PDF (1/16 Pages) Dallas Semiconductor – Digital Thermometer and Thermostat

AVAILABLE
DS1621
Digital Thermometer and Thermostat
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 less
than 1 second
§ Thermostatic settings are user definable and
nonvolatile
§ Data is read from/written via a 2-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 SO package (150mil and
208mil)
Functional Diagrams
PIN ASSIGNMENT
SDA
1
8
V_DD
SCL
2
7
A₀
T_OUT
3
6
A₁
GND
4
5
A₂
DS1621S 8-PIN SO (150mil)
DS1621V 8-PIN SO (208mil)
SDA 1
8
V_DD
SCL
2
7
A₀
T_OUT
3
6
A₁
GND
4
5
A₂
DS1621 8-PIN DIP (300mil)
PIN DESCRIPTION
SDA
- 2-Wire Serial Data Input/Output
SCL
- 2-Wire Serial Clock
GND
- Ground
T_OUT
A0
- Thermostat Output Signal
- Chip Address Input
A1
- Chip Address Input
A2
- Chip Address Input
V_DD
- 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, T_OUT, 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
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UCSP is a trademark of Maxim Integrated Products, Inc.
For pricing, delivery, and ordering information, please contact Maxim Direct
at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.
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