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AVAILAB
LE
DS1620
Digital Thermometer and
Thermostat
www.maxim-ic.com
FEATURES
§ Requires no external components
§ Supply voltage range covers from 2.7V to
5.5V
§ Measures temperatures from -55°C to +125°C
in 0.5°C increments; Fahrenheit equivalent is
PIN ASSIGNMENT
DQ 1
CLK/CONV 2
RST 3
8
7
6
V DD
T HIGH
T LOW
§
§
§
§
-67°F to +257°F in 0.9°F increments
Temperature is read as a 9-bit value
Converts temperature to digital word in 750
ms (max)
Thermostatic settings are user-definable and
nonvolatile
Data is read from/written via a 3-wire serial
GND 4 5 T COM
DS1620S 8-Pin SOIC (208-mil)
DQ 1 8 V DD
CLK/CONV 2 7 T HIGH
§
interface (CLK, DQ, RST )
Applications include thermostatic controls,
industrial systems, consumer products,
RST
GND
3
4
6
5
T LOW
T COM
thermometers, or any thermally sensitive
§
system
8-pin DIP or SOIC (208-mil) packages
DS1620 8-Pin DIP (300-mil)
PIN DESCRIPTION
DQ
- 3-Wire Input/Output
Functional Diagrams
CLK/ CONV
RST
GND
T HIGH
T LOW
T COM
V DD
- 3-Wire Clock Input and
Stand-alone Convert Input
- 3-Wire Reset Input
- Ground
- High Temperature Trigger
- Low Temperature Trigger
- High/Low Combination Trigger
- Power Supply Voltage (3V - 5V)
DESCRIPTION
that TL. Pin
The DS1620 Digital Thermometer and Thermostat provides 9–bit temperature readings which indicate
the temperature of the device. With three thermal alarm outputs, the DS1620 can also act as a thermostat.
T HIGH is driven high if the DS1620’s temperature is greater than or equal to a user–defined temperature
TH. T LOW is driven high if the DS1620’s temperature is less than or equal to a user–defined temperature
TL. T COM is driven high when the temperature exceeds TH and stays high until the temperature falls
below Configurations appear at end of data sheet.
Functional Diagrams continued at end of data sheet.
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.
053105
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