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PDF DS1620 Data sheet ( Hoja de datos )

Número de pieza DS1620
Descripción Digital Thermometer and Thermostat
Fabricantes Dallas 
Logotipo Dallas Logotipo



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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 VDD
CLK/CONV
2
7 THIGH
RST 3
6 TLOW
GND
4
5 TCOM
DS1620S 8-Pin SOIC (208-miil)
See Mech Drawings Section
DQ
CLK/CONV
RST
GND
1
2
3
4
8 VDD
7 THIGH
6 TLOW
5 TCOM
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
THIGH
TLOW
TCOM
VDD
- 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.
THIGH is driven high if the DS1620’s temperature is greater than or equal to a user–defined temperature
TH. TLOW is driven high if the DS1620’s temperature is less than or equal to a user–defined temperature
TL. TCOM is driven high when the temperature exceeds TH and stays high until the temperature falls
below that of TL.
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DS1620 pdf
DS1620
boundary has been met or exceeded, or as part of a closed loop system it can be used to activate a heating
system and deactivate it when the system temperature returns to tolerance.
The TCOM output goes high when the measured temperature meets or exceeds TH, and will stay high until
the temperature equals or falls below TL. In this way, any amount of hysteresis can be obtained.
THERMOSTAT OUTPUT OPERATION Figure 3
THIGH
TLOW
TCOM
TL TH T(°C)
OPERATION AND CONTROL
The DS1620 must have temperature settings resident in the TH and TL registers for thermostatic
operation. A configuration/status register also determines the method of operation that the DS1620 will
use in a particular application and indicates the status of the temperature conversion operation. The
configuration register is defined as follows:
CONFIGURATION/STATUS REGISTER
DONE
THF
TLF
NVB
1
0 CPU 1SHOT
where
DONE = Conversion Done Bit. 1=conversion complete, 0=conversion in progress.
THF = Temperature High Flag. This bit will be set to 1 when the temperature is greater than or equal
to the value of TH. It will remain 1 until reset by writing 0 into this location or by removing power from
the device. This feature provides a method of determining if the DS1620 has ever been subjected to
temperatures above TH while power has been applied.
TLF = Temperature Low Flag. This bit will be set to 1 when the temperature is less than or equal to
the value of TL. It will remain 1 until reset by writing 0 into this location or by removing power from the
device. This feature provides a method of determining if the DS1620 has ever been subjected to
temperatures below TL while power has been applied.
NVB = Nonvolatile Memory Busy Flag. 1=write to an E2 memory cell in progress. 0=nonvolatile
memory is not busy. A copy to E2 may take up to 10 ms.
CPU = CPU Use Bit. If CPU=0, the CLK/ CONV pin acts as a conversion start control, when RST is
low. If CPU is 1, the DS1620 will be used with a CPU communicating to it over the 3–wire port, and the
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DS1620 arduino
DS1620
DC ELECTRICAL CHARACTERISTICS (-55°C to +125°C; VDD=2.7V to 5.5V)
PARAMETER
SYMBOL CONDITION MIN MAX UNITS NOTES
Thermometer Error
TERR
0°C to +70°C
-55°C to +0°C
±½ °C
10, 11
and 70°C to
See Typical Curve
125°C
Logic 0 Output
VOL
0.4 V
3
Logic 1 Output
VOH
2.4 V 2
Input Resistance
RI
RST to GND
1
DQ, CLK to VDD
1
M
M
Active Supply Current ICC 0°C to +70°C
1 mA 4, 5
Standby Supply Current
ISTBY
0°C to +70°C
1 µA 4, 5
SINGLE CONVERT TIMING DIAGRAM (STAND-ALONE MODE)
CONV
tCNV
AC ELECTRICAL CHARACTERISTICS (-55°C to +125°C; VDD=2.7V to 5.5V)
PARAMETERS
SYMBOL MIN TYP MAX UNITS NOTES
Temperature Conversion Time
TTC
400 1000
ms
Data to CLK Setup
tDC 35
ns 6
CLK to Data Hold
tCDH
40
ns 6
CLK to Data Delay
tCDD
100 ns 6, 7, 8
CLK Low Time
tCL 285
ns 6
CLK High Time
tCH 285
ns 6
CLK Frequency
fCLK
DC
1.75 MHz
6
CLK Rise and Fall
tR, tF
500 ns
RST to CLK Setup
tCC 100
ns 6
CLK to RST Hold
tCCH
40
ns 6
RST Inactive Time
tCWH
125
ns 6, 9
CLK High to I/O High-Z
tCDZ
50 ns
6
RST Low to I/O High-Z
tRDZ
50 ns
6
Convert Pulse Width
tCNV 250 ns
500 ms
NV Write Cycle Time
tWR 10 50 ms 12
AC ELECTRICAL CHARACTERISTICS
PARAMETER
SYMBOL
Input Capacitance
I/O Capacitance
CI
CI/O
(-55°C to +125°C; VDD=2.7V to 5.5V)
MIN TYP MAX UNITS NOTES
5 pF
10 pF
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