DS1620 Datasheet, PDF (1/13 Pages) Dallas Semiconductor – Digital Thermometer and Thermostat

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DS1620
Digital Thermometer and Thermostat
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
-67°F to +257°F in 0.9°F increments
§ Temperature is read as a 9-bit value
§ Converts temperature to digital word in 1
second (max)
§ Thermostatic settings are user-definable and
nonvolatile
§ Data is read from/written via a 3-wire serial
interface (CLK, DQ, RST )
§ Applications include thermostatic controls,
industrial systems, consumer products,
thermometers, or any thermally sensitive
system
§ 8-pin DIP or SOIC (208-mil) packages
PIN ASSIGNMENT
DQ
1
8
V_DD
CLK/CONV
2
7
T_HIGH
RST
3
6
T_LOW
GND
4
5
T_COM
DS1620S 8-Pin SOIC (208-miil)
See Mech Drawings Section
DQ
1
CLK/CONV
2
RST
3
GND
4
8
V_DD
7
T_HIGH
6
T_LOW
5
T_COM
DS1620 8-Pin DIP (300-mil)
See Mech Drawings Section
PIN DESCRIPTION
DQ
- 3-Wire Input/Output
CLK/ CONV - 3-Wire Clock Input and
Stand-alone Convert Input
RST
GND
T_HIGH
T_LOW
T_COM
V_DD
- 3-Wire Reset Input
- Ground
- High Temperature Trigger
- Low Temperature Trigger
- High/Low Combination Trigger
- Power Supply Voltage (3V - 5V)
DESCRIPTION
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 that of TL.
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