Thermostats. MAX31723 Datasheet


MAX31723 Datasheet PDF


Part Number

MAX31723

Description

Digital Thermometers and Thermostats

Manufacture

Maxim Integrated

Total Page 15 Pages
Datasheet
Download MAX31723 Datasheet



MAX31723
MAX31722/MAX31723
Digital Thermometers and Thermostats
with SPI/3-Wire Interface
General Description
The MAX31722/MAX31723 digital thermometers and
thermostats with an SPI/3-wire interface provide tem-
perature readings that indicate the device temperature.
No additional components are required; the devices
are truly temperature-to-digital converters. Temperature
readings are communicated from the device over an
SPI interface or a 3-wire serial interface. The choice of
interface is selectable by the user. For applications that
require greater temperature resolution, the user can
adjust the readout resolution from 9 to 12 bits. This is
particularly useful in applications where thermal runaway
conditions must be detected quickly. The thermostat has
a dedicated open-drain output (TOUT). Two thermostat
operating modes, comparator and interrupt, control ther-
mostat operation based on user-defined nonvolatile trip
points (THIGH and TLOW). Both devices feature a 1.7V to
3.7V supply rail.
Applications
Networking Equipment
Cellular Base Stations
Industrial Equipment
Any Thermally Sensitive Systems
Functional Diagram
Benefits and Features
● Maximize System Accuracy in Broad Range of
Thermal Management Applications
• Measures Temperature from -55°C to +125°C
• MAX31722 Thermometer Accuracy of ±2°C
• MAX31723 Thermometer Accuracy of ±0.5°C
• Configurable Resolution from 9 Bits to 12 Bits
(0.5°C to 0.0625°C Resolution)
● Reduce Cost with No External Components
● Extend Performance with Low-Voltage, 1.7V to 3.7V
Power-Supply Range
● Dedicated Thermostat Output with Nonvolatile User-
Defined Thresholds for Quick Detection
● Selectable SPI or 3-Wire Interface for Added
Flexibility
● Available in 8-Pin μMAX® Package for Board Space
Savings
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
MAX31722MUA+ -55NC to +125NC 8 FMAX
MAX31722MUA+T -55NC to +125NC 8 FMAX
MAX31723MUA+ -55NC to +125NC 8 FMAX
MAX31723MUA+T -55NC to +125NC 8 FMAX
+Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
VDD
SDI
SDO
SCLK
CE
SERMODE
GND
PRECISION
VDD REFERENCE
I/O CONTROL
AND
INPUT SENSE
OVERSAMPLING
MODULATOR
CONFIGURATION/
STATUS REGISTER
TEMPERATURE
REGISTER
THIGH AND TLOW
REGISTERS
DIGITAL
DECIMATOR
MAX31722
MAX31723
THERMOSTAT
COMPARATOR
TOUT
µMAX is a registered trademark of Maxim Integrated Products, Inc.
19-5629; Rev 1; 3/15

MAX31723
MAX31722/MAX31723
Digital Thermometers and Thermostats
with SPI/3-Wire Interface
Absolute Maximum Ratings
Voltage Range on VDD Relative to GND...............-0.3V to +6.0V
Voltage Range on Any Other Pin Relative to GND...-0.3V to +6.0V
Continuous Power Dissipation (TA = +70NC)
FMAX (derate 4.5mW/NC above +70NC).......................362mW
EEPROM Programming Temperature Range.. ...-40NC to +85NC
Operating Junction Temperature Range.......... -55NC to +125NC
Storage Temperature Range............................. -55NC to +125NC
Lead Temperature (soldering, 10s).................................+300NC
Soldering Temperature (reflow).......................................+260NC
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.
Recommended Operating Characteristics
(TJ = -55NC to +125NC, unless otherwise noted.)
PARAMETER
Supply Voltage
Input Logic-High
Input Logic-Low
SYMBOL
VDD
VIH
VIL
(Note 1)
(Note 1)
(Note 1)
CONDITIONS
MIN TYP MAX
1.7 3.7
0.7 x VDD
VDD + 0.3
-0.3 0.3 x VDD
UNITS
V
V
V
DC Electrical Characteristics
(VDD = 1.7V to 3.7V, TJ = -55NC to +125NC, unless otherwise noted.)
PARAMETER
MAX31722 Thermometer Error
MAX31723 Thermometer Error
Resolution
Conversion Time
Logic 0 Output (SDO, TOUT)
Logic 1 Output (SDO)
SYMBOL
TERR
TERR
CONDITIONS
-40NC to +85NC
-55NC to +125NC
0NC to +70NC
-55NC to +125NC
tCONVT
VOL
VOH
9-bit conversions
10-bit conversions
11-bit conversions
12-bit conversions
(Note 2)
(Note 3)
MIN TYP MAX UNITS
Q2.0
Q3.0
NC
Q0.5
Q2.0
NC
9 12 Bits
25
50
100
ms
200
0.4 V
VDD -
0.4
V
Leakage Current
Active Current
Shutdown Current
IL
ICC
ICC1
Active temperature conversions (Note 4)
Communication only
EEPROM writes (-40NC to +85NC)
EEPROM writes during active temperature
conversions (-40NC to +85NC)
-1
+1
1150
100
1150
1200
2
FA
FA
FA
www.maximintegrated.com
Maxim Integrated 2




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