MAX31722MUA+T Maxim Integrated Products, MAX31722MUA+T Datasheet

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MAX31722MUA+T

Manufacturer Part Number
MAX31722MUA+T
Description
Board Mount Temperature Sensors SPI/3-Wire Digital Temp Sensor
Manufacturer
Maxim Integrated Products
Datasheet

Specifications of MAX31722MUA+T

Lead Free Status / Rohs Status
Lead free / RoHS Compliant
19-5629; Rev 0; 11/10
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
3.7V supply rail.
SPI is a trademark of Motorola, Inc.
µMAX is a registered trademark of Maxim Integrated Products, Inc.
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.
Networking Equipment
Cellular Base Stations
Industrial Equipment
Any Thermally Sensitive Systems
HIGH
and T
SERMODE
_______________________________________________________________ Maxim Integrated Products 1
SCLK
GND
SDO
V
SDI
CE
LOW
DD
Digital Thermometers and Thermostats
General Description
). Both devices feature a 1.7V to
V
DD
Applications
I/O CONTROL
INPUT SENSE
REFERENCE
PRECISION
AND
STATUS REGISTER
CONFIGURATION/
OVERSAMPLING
T
TEMPERATURE
HIGH
MODULATOR
with SPI/3-Wire Interface
REGISTERS
REGISTER
AND T
S
S
S
S
S
S
S
S
S
+Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
LOW
MAX31722MUA+
MAX31722MUA+T
MAX31723MUA+
MAX31723MUA+T
Temperature Measurements Require No External
Components
Measures Temperatures from -55NC to +125NC
MAX31722 Thermometer Accuracy is ±2.0NC
MAX31723 Thermometer Accuracy is ±0.5NC
Thermometer Resolution is Configurable from 9
to 12 Bits (0.5NC to 0.0625NC Resolution)
Thermostat Output with User-Defined Nonvolatile
Thresholds
Data is Read from/Written to by SPI (Mode 0 and 2)
or 3-Wire Serial Interface
1.7V to 3.7V Power-Supply Range
Available in 8-Pin µMAX
PART
COMPARATOR
THERMOSTAT
DECIMATOR
DIGITAL
-55NC to +125NC
-55NC to +125NC
-55NC to +125NC
-55NC to +125NC
TEMP RANGE
Ordering Information
MAX31722
MAX31723
Functional Diagram
®
Package
TOUT
PIN-PACKAGE
8 FMAX
8 FMAX
8 FMAX
8 FMAX
Features

Related parts for MAX31722MUA+T

MAX31722MUA+T Summary of contents

Page 1

... Thermostat Output with User-Defined Nonvolatile S Thresholds Data is Read from/Written to by SPI (Mode 0 and 3-Wire Serial Interface 1.7V to 3.7V Power-Supply Range S Available in 8-Pin µMAX S PART MAX31722MUA+ MAX31722MUA+T MAX31723MUA+ MAX31723MUA+T +Denotes a lead(Pb)-free/RoHS-compliant package Tape and reel. PRECISION OVERSAMPLING REFERENCE MODULATOR CONFIGURATION/ STATUS REGISTER I/O CONTROL ...

Page 2

Digital Thermometers and Thermostats with SPI/3-Wire Interface ABSOLUTE MAXIMUM RATINGS Voltage Range on V Relative to GND ..............-0.3V to +6.0V DD Voltage Range on Any Other Pin Relative to GND ...-0.3V to +6.0V Continuous Power Dissipation (T = +70NC) A ...

Page 3

Digital Thermometers and Thermostats AC ELECTRICAL CHARACTERISTICS: 3-WIRE INTERFACE (V = 1.7V to 3.7V -55NC to +125NC, unless otherwise noted.) (Figures PARAMETER SYMBOL Data to SCLK Setup SCLK to Data Hold SCLK to Data ...

Page 4

Digital Thermometers and Thermostats with SPI/3-Wire Interface SCLK t CDH I/O* *I/O IS SDI AND SDO CONNECTED TOGETHER. Figure 1. Timing Diagram: 3-Wire Read Data Transfer SCLK I/O* ...

Page 5

Digital Thermometers and Thermostats SCLK t CDH t DC SDI A7 SDO WRITE ADDRESS BYTE NOTE: SCLK CAN BE EITHER POLARITY, TIMING SHOWN FOR CPOL = 1. Figure 3. Timing Diagram: SPI Read Data Transfer CE t ...

Page 6

Digital Thermometers and Thermostats with SPI/3-Wire Interface (T = +25°C, unless otherwise noted.) A TEMPERATURE CONVERSION ACTIVE SUPPLY CURRENT vs. TEMPERATURE 1200 1000 V = 3.7V DD 800 600 400 V = 1.7V DD 200 0 -55 -35 -15 5 ...

Page 7

Digital Thermometers and Thermostats Pin Configuration TOP VIEW + TOUT MAX31722 MAX31723 SCLK 3 GND 4 µMAX PIN NAME 1 Thermostat Output. Open-drain output indicator for internal thermal alarm limits. TOUT Chip Enable. Must be asserted high ...

Page 8

Digital Thermometers and Thermostats with SPI/3-Wire Interface Measuring Temperature The core of the devices’ functionality is its direct-to-digital temperature sensor. The devices measure temperature through the use of an on-chip temperature measure- ment technique with a -55NC to +125NC operating ...

Page 9

Digital Thermometers and Thermostats The devices’ thermostat can be programmed to power up in either comparator mode or interrupt mode, which activate and deactivate the open-drain thermostat output (TOUT) based on user-programmable trip points (T and T ). The T ...

Page 10

Digital Thermometers and Thermostats with SPI/3-Wire Interface In either mode, once TOUT has been deactivated only reactivated when the measured temperature falls below the T value. Thus, this interrupt/clear pro- LOW cess is cyclical between T and T ...

Page 11

Digital Thermometers and Thermostats Table 3. Configuration/Status Register Bit Descriptions (continued) R1: Thermostat resolution bit 1. Factory power-up state = 0 and is stored in nonvolatile memory. Sets the con- BIT 2 version resolution (see Table 4). R0: Thermostat resolution ...

Page 12

Digital Thermometers and Thermostats with SPI/3-Wire Interface CPOL = 1 CE SCLK CPOL = 0 CE SCLK NOTE: CPOL IS A BIT THAT IS SET IN THE MICROCONTROLLER’S CONTROL REGISTER. Figure 7. Serial Clock as a Function of Microcontroller Clock ...

Page 13

Digital Thermometers and Thermostats CE SCLK SDI SDO HIGH-Z Figure 8. SPI Single-Byte Read CE SCLK SDI SDO HIGH-Z Figure 9. SPI Single-Byte Write CE SCLK WRITE SDI SDI READ SDO Figure 10. SPI ...

Page 14

Digital Thermometers and Thermostats with SPI/3-Wire Interface CE SCLK I/ *I/O IS SDI AND SDO CONNECTED TOGETHER. Figure 11. 3-Wire Single-Byte Transfer CE SCLK ADDRESS I/O* BYTE *I/O IS SDI AND SDO CONNECTED TOGETHER. Figure 12. 3-Wire ...

Page 15

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 2010 Maxim Integrated Products © ...

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