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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX31820PAR Datasheet

Ambient Temperature Sensor

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MAX31820PAR
1-Wire, Parasite-Power,
Ambient Temperature Sensor
General Description
The MAX31820PAR ambient temperature sensor pro-
vides 9-bit to 12-bit Celsius temperature measurements
with ±0.5°C accuracy over a +10°C to +45°C temperature
range. Over its entire -55°C to +125°C operating range,
the device has ±2.0°C accuracy.
The device communicates over a 1-Wire® bus that, by
definition, requires only one data line (and ground) for
communication with a central microprocessor. In addi-
tion, the device derives power directly from the data line
(“parasite power”), eliminating the need for an external
power supply. Requiring so few pins enables the device
to be placed in a 3-pin TO-92 package. The form factor
of this package allows the device to be placed above
the board and thus measure the ambient temperature of
a system, as opposed to the board temperature that a
surface-mount package would measure.
Each MAX31820PAR has a unique 64-bit serial code, which
allows multiple MAX31820PAR devices to function on the
same 1-Wire bus. Therefore, it is simple to use one micropro-
cessor to control many devices distributed over a large area.
Applications
● HVAC Environmental Controls
● Temperature Monitoring Systems Inside Buildings,
Equipment, or Machinery
● Process Monitoring and Control Systems
● Thermostatic Controls
● Industrial Systems
● Consumer Products
● Thermometers
● Any Thermally Sensitive System
Block Diagram
VPU
4.7kΩ
DQ
PARASITE-POWER
CIRCUIT
CPP
64-BIT ROM
AND
1-Wire PORT
GND
Benefits and Features
● Unique 1-Wire Interface Requires Only One Port Pin
for Communication
● Derives Power from Data Line (Parasite Power); No
Local Power Supply Needed
● Multidrop Capability Simplifies Distributed
Temperature-Sensing Applications
● Requires No External Components
● Measures Temperatures from -55°C to +125°C (-67°F
to +257°F)
● ±0.5°C Accuracy from +10°C to +45°C
● Thermometer Resolution is User-Selectable from
9 Bits to 12 Bits
● Converts Temperature to 12-Bit Digital Word in
750ms (Max)
● User-Definable Nonvolatile (NV) Alarm Settings
● Alarm Search Command Identifies and Addresses
Devices Whose Temperature is Outside Programmed
Limits (Temperature Alarm Condition)
● Available in 3-Pin TO-92 Package
● Software Compatible with the DS1822-PAR and
DS18B20-PAR
Ordering Information appears at end of data sheet.
For related parts and recommended products to use with this part, refer
to www.maximintegrated.com/MAX31820PAR.related.
MEMORY
CONTROL LOGIC
SCRATCHPAD
MAX31820PAR
TEMPERATURE REGISTER
ALARM HIGH TRIGGER (TH)
REGISTER (EEPROM)
ALARM LOW TRIGGER (TL)
REGISTER (EEPROM)
CONFIGURATION REGISTER (EEPROM)
8-BIT CRC GENERATOR
1-Wire is a registered trademark of Maxim Integrated Products, Inc.
19-6732; Rev 0; 6/13


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX31820PAR Datasheet

Ambient Temperature Sensor

No Preview Available !

MAX31820PAR
1-Wire, Parasite-Power,
Ambient Temperature Sensor
Absolute Maximum Ratings
Voltage Range on Any Pin Relative to Ground.....-0.5V to +6.0V
Operating Temperature Range.......................... -55°C to +100°C
Storage Temperature Range............................. -55°C to +125°C
Soldering Temperature (reflow)........................................+260°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these
or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect
device reliability.
DC Electrical Characteristics
(VPU = 3.0V to 3.7V, TA = -55°C to +100°C, unless otherwise noted.) (Note 1)
PARAMETER
Pullup Supply Voltage
Thermometer Error
Input Logic-Low
Input Logic-High
Sink Current
Active Current
DQ Input Current
Drift
SYMBOL
VPU
TERR
VIL
VIH
IL
IDQA
IDQ
CONDITIONS
(Notes 2, 3)
+10°C to +45°C
-55°C to +100°C
(Notes 2, 4, 5)
(Notes 2, 6)
VI/O = 0.4V (Note 2)
(Note 7)
(Note 8)
(Note 9)
MIN TYP MAX UNITS
3.0 3.7 V
±0.5
±2
°C
-0.3
+0.8
V
3.0 3.7 V
4.0 mA
1 1.5 mA
5
±0.2
µA
°C
www.maximintegrated.com
Maxim Integrated 2


Part Number MAX31820PAR
Description Ambient Temperature Sensor
Maker Maxim Integrated
Total Page 21 Pages
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