Rainbow-electronics MAX31723 Uživatelský manuál

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_______________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
MAX31722/MAX31723
Digital Thermometers and Thermostats
with SPI/3-Wire Interface
19-5629; Rev 0; 11/10
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 (T
HIGH
and T
LOW
). Both devices feature a 1.7V to
3.7V supply rail.
Applications
Networking Equipment
Cellular Base Stations
Industrial Equipment
Any Thermally Sensitive Systems
Features
S Temperature Measurements Require No External
Components
S Measures Temperatures from -55NC to +125NC
S MAX31722 Thermometer Accuracy is ±2.0NC
S MAX31723 Thermometer Accuracy is ±0.5NC
S Thermometer Resolution is Configurable from 9
to 12 Bits (0.5NC to 0.0625NC Resolution)
S Thermostat Output with User-Defined Nonvolatile
Thresholds
S Data is Read from/Written to by SPI (Mode 0 and 2)
or 3-Wire Serial Interface
S 1.7V to 3.7V Power-Supply Range
S Available in 8-Pin µMAX
®
Package
Ordering Information
SPI is a trademark of Motorola, Inc.
µMAX is a registered trademark of Maxim Integrated Products, Inc.
+Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
Functional Diagram
MAX31722
MAX31723
OVERSAMPLING
MODULATOR
CONFIGURATION/
STATUS REGISTER
PRECISION
REFERENCE
I/O CONTROL
AND
INPUT SENSE
DIGITAL
DECIMATOR
SDI
V
DD
V
DD
SCLK
SDO
SERMODE
GND
TOUT
CE
TEMPERATURE
REGISTER
T
HIGH
AND T
LOW
REGISTERS
THERMOSTAT
COMPARATOR
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
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Shrnutí obsahu

Strany 1 - MAX31722/MAX31723

_______________________________________________________________ Maxim Integrated Products 1For pricing, delivery, and ordering information, pleas

Strany 2

MAX31722/MAX31723Digital Thermometers and Thermostats with SPI/3-Wire Interface10In either mode, once TOUT has been deactivated, it is only react

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MAX31722/MAX31723Digital Thermometers and Thermostats with SPI/3-Wire Interface11as depicted in the AC Electrical Characteristics. The user has read/w

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MAX31722/MAX31723Digital Thermometers and Thermostats with SPI/3-Wire Interface12Figure 7. Serial Clock as a Function of Microcontroller Clock Polarit

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MAX31722/MAX31723Digital Thermometers and Thermostats with SPI/3-Wire Interface13Figure 9. SPI Single-Byte WriteFigure 10. SPI Multiple-Byte Burst Tra

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MAX31722/MAX31723Digital Thermometers and Thermostats with SPI/3-Wire Interface14

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Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are

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MAX31722/MAX31723Digital Thermometers and Thermostats with SPI/3-Wire Interface2Stresses beyond those listed under “Absolute Maximum Ratings” may cau

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MAX31722/MAX31723Digital Thermometers and Thermostats with SPI/3-Wire Interface3AC ELECTRICAL CHARACTERISTICS: 3-WIRE INTERFACE(VDD = 1.7V to 3.7V, TJ

Strany 10

MAX31722/MAX31723Digital Thermometers and Thermostats with SPI/3-Wire Interface4Figure 1. Timing Diagram: 3-Wire Read Data TransferFigure 2. Timing Di

Strany 11

MAX31722/MAX31723Digital Thermometers and Thermostats with SPI/3-Wire Interface5Figure 3. Timing Diagram: SPI Read Data TransferFigure 4. Timing Diagr

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MAX31722/MAX31723Digital Thermometers and Thermostats with SPI/3-Wire Interface6 Typical

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MAX31722/MAX31723Digital Thermometers and Thermostats with SPI/3-Wire Interface7 Detailed DescriptionThe MAX31722/MAX31723 are

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MAX31722/MAX31723Digital Thermometers and Thermostats with SPI/3-Wire Interface8Figure 5. Temperature, THIGH, and TLOW Register Format

Strany 15

MAX31722/MAX31723Digital Thermometers and Thermostats with SPI/3-Wire Interface9 ThermostatThe devices’ thermostat

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