MAX31726 Temperature Sensors Datasheet

MAX31726 Datasheet, PDF, Equivalent


Part Number

MAX31726

Description

Local Temperature Sensors

Manufacture

Maxim Integrated

Total Page 15 Pages
Datasheet
Download MAX31726 Datasheet


MAX31726
MAX31725/MAX31726
±0.5°C Local Temperature Sensors
General Description
The MAX31725/MAX31726 temperature sensors
accurately measure temperature and provide an
overtemperature alarm/interrupt/shutdown output. These
devices convert the temperature measurements to digital
form using a high-resolution, sigma-delta, analog-to-
digital converter (ADC). Accuracy is Q0.5NC from -40NC
to +105NC. Communication is through an I2C-compatible
2-wire serial interface.
The I2C serial interface accepts standard write byte, read
byte, send byte, and receive byte commands to read
the temperature data and configure the behavior of the
open-drain overtemperature shutdown output.
The MAX31725 features three address select lines with a
total of 32 available addresses. The MAX31726 features
two address select lines with a total of 16 available
addresses and a RESET input. The sensors have a
2.5V to 3.7V supply voltage range, low 600FA supply
current, and a lockup-protected I2C-compatible interface
that make them ideal for a wide range of applications,
including PCs, electronic test equipment, and office
electronics.
Both devices are available in an 8-pin TDFN package and
operate over the -55NC to +150NC temperature range.
Benefits and Features
S High Accuracy and Low-Voltage Operation Aids
Designers in Meeting Error and Power Budgets
±0.5°C Accuracy from -40°C to +105°C
16-Bit (0.00390625°C) Temperature Resolution
2.5V to 3.7V Supply Voltage Range
S One-Shot and Shutdown Modes Help Reduce
Power Usage
925μA (max) Operating Supply Current
S Extended Temperature Range Enables
Measurements in High Temperature Systems
(Measures Up to +150°C)
S Digital Functions Make Integration Easier into Any
System
Selectable Timeout Prevents Bus Lockup
(Default Enabled for MAX31725; Default
Disabled for MAX31726)
Separate Open-Drain OS Output Operates as
Interrupt or Comparator/Thermostat Output
RESET Input (MAX31726)
Applications
Servers
Telecom
Networking
Industrial
Ordering Information appears at end of data sheet.
Typical Application Circuits
4.7k
TO I2C
MASTER
+2.5V TO +3.7V
SDA VDD
SCL MAX31725
OS
A0
A1
GND A2
0.1µF
4.7k
TO I2C
MASTER
+2.5V TO +3.7V
SDA VDD
SCL MAX31726
OS
A0
A1
GND RESET
0.1µF
For related parts and recommended products to use with this part, refer to: www.maximintegrated.com/MAX31725.related
For pricing, delivery, and ordering information, please contact Maxim Direct at
1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.
19-6477; Rev 2; 12/14

MAX31726
MAX31725/MAX31726
±0.5°C Local Temperature Sensors
ABSOLUTE MAXIMUM RATINGS
(All voltages relative to GND.)
Voltage Range on VDD, SDA, SCL, A0, A1.............-0.3V to +4V
Voltage Range on A2, RESET, OS............ -0.3V to (VDD + 0.3V)
Input Current at Any Pin .................................................... +5mA
Package Input Current .................................................... +20mA
Continuous Power Dissipation (TA = +70NC)
TDFN (derate 24.4mW/NC above +70NC)................1951.2mW
ESD Protection (All Pins, Human Body Model) (Note 1)..... Q4000V
Operating Temperature Range......................... -55NC to +150NC
Junction Temperature......................................................+150NC
Storage Temperature Range............................. -65NC to +150NC
Lead Temperature (soldering, 10s).................................+300NC
Soldering Temperature (reflow) ......................................+260NC
Note 1: Human Body Model, 100pF discharged through a 1.5kI resistor.
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional opera-
tion 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.
PACKAGE THERMAL CHARACTERISTICS (Note 2)
TDFN
Junction-to-Ambient Thermal Resistance (qJA)...........41°C/W
Junction-to-Case Thermal Resistance (qJC)..................8°C/W
Note 2: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer
board. For detailed information on package thermal considerations, refer to www.maximintegrated.com/thermal-tutorial.
RECOMMENDED OPERATING CONDITIONS
(TA = -55NC to +150NC, unless otherwise noted.) (Notes 3, 4)
PARAMETER
SYMBOL
CONDITIONS
Operating Supply Voltage
Input High Voltage
Input Low Voltage
VDD
VIH
VIL
MIN TYP MAX
2.5 3.3 3.7
VDD x 0.7
VDD x 0.3
UNITS
V
V
V
ELECTRICAL CHARACTERISTICS
(VDD = 2.5V to 3.7V, TA = -55NC to +150NC, unless otherwise noted. Typical values are VDD = 3.3V, TA = +25NC.) (Note 3)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX
Accuracy (Note 5)
Temperature Conversion Noise
2.5V P + VDD P 3.7V, -40NC P TA P +105NC -0.5 ±0.1 +0.5
2.5V P + VDD P 3.7V, -55NC P TA P +150NC -0.7
+0.7
0.0625
Temperature Data Resolution
16 16
UNITS
NC
NC
Bits
Conversion Time
44 50
ms
First Conversion Completed
Quiescent Supply Current
Data ready after POR
I2C inactive, TA = -40NC to +125NC
Shutdown mode, I2C inactive, TA =
IDD
-40NC to +125NC
I2C inactive, TA = +150NC
Shutdown mode, I2C inactive,
TA = +150NC
50
600 925
2.5 3.5
800
4.2
ms
FA
Maxim Integrated
  2


Features MAX31725/MAX31726 ±0.5°C Local Temper ature Sensors General Description The MAX31725/MAX31726 temperature sensors a ccurately measure temperature and provi de an overtemperature alarm/interrupt/s hutdown output. These devices convert t he temperature measurements to digital form using a high-resolution, sigma-del ta, analog-todigital converter (ADC). A ccuracy is Q0.5NC from -40NC to +105NC. Communication is through an I2C-compat ible 2-wire serial interface. The I2C s erial interface accepts standard write byte, read byte, send byte, and receive byte commands to read the temperature data and configure the behavior of the open-drain overtemperature shutdown out put. The MAX31725 features three addres s select lines with a total of 32 avail able addresses. The MAX31726 features t wo address select lines with a total of 16 available addresses and a RESET inp ut. The sensors have a 2.5V to 3.7V sup ply voltage range, low 600FA supply cur rent, and a lockup-protected I2C-compatible interface that make t.
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