MAX31723MUA+ ,Digital Thermometers and Thermostats with SPI/3-Wire InterfaceApplicationsMAX31722MUA+ -55NC to +125NC 8 FMAXNetworking EquipmentMAX31722MUA+T -55NC to +125NC 8 ..
MAX3172CAI ,#.3V Multiprotocol Software-Selectable Cable Terminators and TransceiversApplicationsData Networking PCI CardsPin Configuration appears at end of data sheet.CSU and DSU Tel ..
MAX3172CAI+ ,+3.3V Multiprotocol Software-Selectable Cable Terminators and TransceiversFeaturesThe MAX3172/MAX3174 contain five software-selec-♦ Industry’s First +3.3V Multiprotocol Term ..
MAX3172EAI+T ,+3.3V Multiprotocol Software-Selectable Cable Terminators and TransceiversApplicationsData Networking PCI CardsPin Configuration appears at end of data sheet.CSU and DSU Tel ..
MAX3173CAI ,+3.3V Multiprotocol 3Tx/3Rx Software-Selectable Control Transceiversapplications that do not require deglitching on MAX3173 CAI 0°C to +70°C 28 SSOP the serial handsha ..
MAX3173CAI+ ,+3.3V Multiprotocol 3Tx/3Rx Software-Selectable Control TransceiversELECTRICAL CHARACTERISTICS(V = 3.3V ±5%; C1 = C2 = 1µF, C3 = C4 = C5 = 3.3µF, and T = T to T , unle ..
MAX639CSA+ ,5V/3.3V/3V Adjustable, High-Efficiency, Low-IQ, Step-Down DC-DC ConvertersELECTRICAL CHARACTERISTICS(V+ = 9V for the MAX639, V+ = 5V for the MAX640/MAX653, I = 0mA, T = T to ..
MAX639CSA+ ,5V/3.3V/3V Adjustable, High-Efficiency, Low-IQ, Step-Down DC-DC ConvertersGeneral Description ________
MAX639ESA ,5V/3.3V/3V/Adjustable, High-Efficiency, Low IQ, Step-Down DC-DC Converters
MAX639ESA+ ,5V/3.3V/3V Adjustable, High-Efficiency, Low-IQ, Step-Down DC-DC ConvertersMAX639/MAX640/MAX65319-4505; Rev 3; 8/975V/3.3V/3V/Adjustable, High-Efficiency, Low I , Step-Down D ..
MAX639ESA+T ,5V/3.3V/3V Adjustable, High-Efficiency, Low-IQ, Step-Down DC-DC ConvertersELECTRICAL CHARACTERISTICS(V+ = 9V for the MAX639, V+ = 5V for the MAX640/MAX653, I = 0mA, T = T to ..
MAX639ESA+T ,5V/3.3V/3V Adjustable, High-Efficiency, Low-IQ, Step-Down DC-DC ConvertersFeaturesThe MAX639/MAX640/MAX653 step-down switching' High Efficiency for a Wide Range of Load Curr ..
MAX31723MUA+
Digital Thermometers and Thermostats with SPI/3-Wire Interface
General DescriptionThe 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.
ApplicationsNetworking Equipment
Cellular Base Stations
Industrial Equipment
Any Thermally Sensitive Systems
Beneits and Features●Maximize System Accuracy in Broad Range of
Thermal Management ApplicationsMeasures Temperature from -55°C to +125°CMAX31722 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 InformationµMAX is a registered trademark of Maxim Integrated Products, Inc.
+Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
Functional Diagram
MAX31722
MAX31723OVERSAMPLING
MODULATOR
CONFIGURATION/
STATUS REGISTER
PRECISION
REFERENCE
I/O CONTROL
AND
INPUT SENSE
DIGITAL
DECIMATOR
SDI
VDD
VDD
SCLK
SDO
SERMODE
GNDTOUTTEMPERATURE
REGISTER
THIGH AND TLOW
REGISTERS
THERMOSTAT
COMPARATOR
PARTTEMP RANGEPIN-PACKAGE
MAX31722MUA+-55NC to +125NC8 FMAX
MAX31722MUA+T-55NC to +125NC8 FMAX
MAX31723MUA+-55NC to +125NC8 FMAX
MAX31723MUA+T-55NC to +125NC8 FMAX
MAX31722/MAX31723Digital Thermometers and Thermostats
with SPI/3-Wire Interface
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.
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
Recommended Operating Characteristics(TJ = -55NC to +125NC, unless otherwise noted.)
DC Electrical Characteristics(VDD = 1.7V to 3.7V, TJ = -55NC to +125NC, unless otherwise noted.)
Absolute Maximum RatingsPARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
Supply VoltageVDD(Note 1)1.73.7V
Input Logic-HighVIH(Note 1)0.7 x VDDVDD + 0.3V
Input Logic-LowVIL(Note 1)-0.30.3 x VDDV
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
MAX31722 Thermometer ErrorTERR-40NC to +85NCQ2.0NC-55NC to +125NCQ3.0
MAX31723 Thermometer ErrorTERR0NC to +70NCQ0.5NC-55NC to +125NCQ2.0
Resolution912Bits
Conversion TimetCONVT
9-bit conversions2510-bit conversions50
11-bit conversions100
12-bit conversions200
Logic 0 Output (SDO, TOUT)VOL(Note 2)0.4V
Logic 1 Output (SDO)VOH(Note 3)VDD -
0.4V
Leakage CurrentIL-1+1FA
Active CurrentICC
Active temperature conversions (Note 4)1150
Communication only100
EEPROM writes (-40NC to +85NC)1150
EEPROM writes during active temperature
conversions (-40NC to +85NC)1200
Shutdown CurrentICC12FA
MAX31722/MAX31723Digital Thermometers and Thermostats
with SPI/3-Wire Interface
AC Electrical Characteristics: 3-Wire Interface(VDD = 1.7V to 3.7V, TJ = -55NC to +125NC, unless otherwise noted.) (Figures 1, 2)
AC Electrical Characteristics: SPI Interface(VDD = 1.7V to 3.7V, TJ = -55NC to +125NC, unless otherwise noted.) (Figures 3, 4)
AC Electrical Characteristics: EEPROM(VDD = 1.7V to 3.7V, TJ = -55NC to +125NC, unless otherwise noted.)
Note 1: All voltages are referenced to ground. Currents entering the IC are specified positive, and currents exiting the IC are negative.
Note 2: Logic 0 voltages are specified at a sink current of 3mA.
Note 3: Logic 1 voltages are specified at a source current of 1mA.
Note 4: ICC specified with SCLK = VDD and CE = GND.
Note 5: Measured at VIH = 0.7V x VDD or VIL = 0.3 x VDD and 10ms maximum rise and fall times.
Note 6: Measured with 50pF load.
Note 7: Measured at VOH = 0.7 x VDD or VOL = 0.3 x VDD. Measured from the 50% point of SCLK to the VOH minimum of SDO.
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
Data to SCLK SetuptDC(Notes 5, 6)35ns
SCLK to Data HoldtCDH(Notes 5, 6)35ns
SCLK to Data ValidtCDD(Notes 5, 6, 7)80ns
SCLK Low TimetCL(Note 6)100ns
SCLK High TimetCH(Note 6)100ns
SCLK FrequencytCLK(Note 6)DC5.0MHz
SCLK Rise and FalltR, tF200ns
CE to SCLK SetuptCC(Note 6)400ns
SCLK to CE HoldtCCH(Note 6)100ns
CE Inactive TimetCWH(Note 6)400ns
CE to Output High-ZtCDZ(Notes 5, 6)40ns
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
EEPROM Write Cycle TimetWR-40NC to +85NC (Note 8)15ms
EEPROM Write EnduranceNEEWR-40NC P TA P +85NC (Note 8)20,000CyclesTA = +25NC (Note 8)80,000
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
Data to SCLK SetuptDC(Notes 5, 6)35ns
SCLK to Data HoldtCDH(Notes 5, 6)35ns
SCLK to Data ValidtCDD(Notes 5, 6, 7)80ns
SCLK Low TimetCL(Note 6)100ns
SCLK High TimetCH(Note 6)100ns
SCLK FrequencytCLK(Note 6)DC5.0MHz
SCLK Rise and FalltR, tF200ns
CE to SCLK SetuptCC(Note 6)400ns
SCLK to CE HoldtCCH(Note 6)100ns
CE Inactive TimetCWH(Note 6)400ns
CE to Output High-ZtCDZ(Notes 5, 6)40ns
SCLK to Output High-ZtCCZ(Notes 5, 6)40ns
MAX31722/MAX31723Digital Thermometers and Thermostats
with SPI/3-Wire Interface
Figure 1. Timing Diagram: 3-Wire Read Data Transfer
Figure 2. Timing Diagram: 3-Wire Write Data Transfer
WRITE ADDRESS BYTE
*I/O IS SDI AND SDO CONNECTED TOGETHER.
READ DATA BIT
tCC
tDCA1A7D0D1
tCDHtCDD
tCCZ
tCDZ
tCDD
SCLK
I/O*
*I/O IS SDI AND SDO CONNECTED TOGETHER.
SCLK
I/O*
tCC
tCLtRtF
tCCH
tCWH
tDC
tCDHtCH
WRITE ADDRESS BYTEWRITE DATAA1A7D0
MAX31722/MAX31723Digital Thermometers and Thermostats
with SPI/3-Wire Interface
Figure 3. Timing Diagram: SPI Read Data Transfer
Figure 4. Timing Diagram: SPI Write Data Transfer
SCLK
SDI
SDO
tCC
tCDHA6A0D6D1D0
tDC
tCDDtCDD
tCDZ
NOTE: SCLK CAN BE EITHER POLARITY, TIMING SHOWN FOR CPOL = 1.WRITE ADDRESS BYTEREAD DATA BYTE
SCLK
SDI
NOTE: SCLK CAN BE EITHER POLARITY, TIMING SHOWN FOR CPOL = 1.WRITE ADDRESS BYTEWRITE DATA BYTE
tCC
tCDHtCHtFtCCH
tCWH
tCDHA6A0D7D0
tDC
tCL
MAX31722/MAX31723Digital Thermometers and Thermostats
with SPI/3-Wire Interface
TEMPERATURE CONVERSION ERROR
vs. REFERENCE TEMPERATURE
MAX31722/3 toc03
TEMPERATURE (°C)
ERROR (°C)6020400-20
12-BIT TEMPERATURE CONVERSIONS
VDD = 3.0V
-3σ
STANDBY SUPPLY CURRENT
vs. TEMPERATURE
MAX31722/3 toc02
TEMPERATURE (°C)
ICC
(µA)1056545255-15-35
VDD = 3.7V
VDD = 3.0V
VDD = 1.7V
TEMPERATURE CONVERSION ACTIVE
SUPPLY CURRENT vs. TEMPERATURE
MAX31722/3 toc01
TEMPERATURE (°C)
ICC
(µA)
VDD = 3.7V
VDD = 3.0V
VDD = 1.7V
MAX31722/MAX31723Digital Thermometers and Thermostats
with SPI/3-Wire Interface
Typical Operating Characteristics(TA = +25°C, unless otherwise noted.)
Detailed DescriptionThe MAX31722/MAX31723 are factory-calibrated tem-
perature sensors that require no external components.
The user can alter the configuration/status register to
place the device in a continuous temperature conversion
mode or into a one-shot conversion mode. In the continu-
ous conversion mode, the devices continuously convert
the temperature and store the result in the temperature
register. As conversions are performed in the back-
ground, reading the temperature register does not affect
the conversion in progress. In the one-shot temperature
conversion mode, the devices perform one temperature
conversion, store the result in the temperature register,
and then return to the shutdown state. This conversion
temperature conversion results have a default resolution
of 9 bits. In applications where small incremental tem-
perature changes are critical, the user can change the
conversion resolution from 9 bits to 10, 11, or 12. This is
accomplished by programming the configuration/status
register.
The devices can be configured as a thermostat, allow-
ing for the TOUT pin to behave as an interrupt, trigger-
ing when the programmed limits, THIGH and TLOW, are
surpassed. The devices can communicate using either a
serial peripheral interface (SPI) or standard 3-wire inter-
face. The user can select either communication standard
through the SERMODE pin, connecting it to VDD for SPI
and to GND for 3-wire.
Pin Coniguration
Pin Description
µMAXSERMODECEVDDTOUT
+SDISCLK36
SDOGND45
MAX31722
MAX31723
TOP VIEW
PINNAMEFUNCTIONTOUTThermostat Output. Open-drain output indicator for internal thermal alarm limits.CEChip Enable. Must be asserted high for communication to take place for either the SPI or 3-wire
interfaces.SCLKSerial-Clock Input. Used to synchronize data movement on the serial interface for either SPI or
3-wire interfaces.GNDGround. Ground connection.SDO
Serial-Data Output. When SPI communication is selected, the SDO pin is the serial-data output for
the SPI bus. When 3-wire communication is selected, this pin must be connected to the SDI pin.
The SDI and SDO pins function as a single I/O pin when connected together.SDI
Serial-Data Input. When SPI communication is selected, the SDI pin is the serial-data input for the
SPI bus. When 3-wire communication is selected, this pin must be connected to the SDO pin. The
SDI and SDO pins function as a single I/O pin when connected together.SERMODESerial-Interface Mode Input. This pin selects which interface is used. When connected to VDD, SPI
communication is selected. When connected to GND, 3-wire communication is selected. VDDSupply Voltage. Power-supply input.
MAX31722/MAX31723Digital Thermometers and Thermostats
with SPI/3-Wire Interface
Figure 5. Temperature, THIGH, and TLOW Register Format
Measuring TemperatureThe 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 range.
The devices power up in a power-conserving shutdown
mode. After power-up, the devices can be placed in a
continuous conversion mode or in a one-shot conver-
sion mode. In the continuous conversion mode, the
devices continuously compute the temperature and
store the most recent result in the temperature register at
addresses 01h (LSB) and 02h (MSB). As conversions are
performed in the background, reading the temperature
register does not affect the conversion in progress. The
temperature value is not updated until the SPI or 3-wire
interface is inactive. In other words, CE must be inactive
for the temperature register to be updated with the most
recent temperature conversion value. In the one-shot
conversion mode, the devices perform one temperature
conversion and then return to the shutdown mode, storing
temperature in the temperature register. This conversion
mode is ideal for power-sensitive applications. Details on
how to change the setting after power-up are contained
in the Programming section.
The resolution of the temperature conversion is con-
figurable (9, 10, 11, or 12 bits) with 9 bits reading the
default state. This equates to a temperature resolution
of 0.5NC, 0.25NC, 0.125NC, or 0.0625NC. Following each
conversion, thermal data is stored in the temperature
register in two’s complement format. The information
can be retrieved over the SPI or 3-wire interface with the
address set to the temperature register, 01h (LSB) and
then 02h (MSB). Table 1 describes the exact relation-
ship of output data to measured temperature. Table 1
assumes the devices are configured for 12-bit resolution.
If the devices are configured in a lower resolution mode,
those bits contain zeros. The data is transmitted serially
over the digital interface, MSB first for SPI communica-
tion and LSB first for 3-wire communication. The MSB of
the temperature register contains the sign (S) bit, denot-
ing whether the temperature is positive or negative.
Table 1. 12-Bit Resolution Temperature/Data Relationship2625242322212002h
MSB(UNITS = NC)LSB
2-12-22-32-4000001h
TEMPERATURE
(NC)
DIGITAL OUTPUT
(BINARY)
DIGITAL OUTPUT
(HEX)
+1250111 1101 0000 00007D00
+25.06250001 1001 0001 00001910
+10.1250000 1010 0010 00000A20
+0.50000 0000 1000 000000800000 0000 0000 00000000
-0.51111 1111 1000 0000FF80
-10.1251111 0101 1110 0000F5E0
-25.06251110 0110 1111 0000E6F0
-551100 1001 0000 0000C900
MAX31722/MAX31723Digital Thermometers and Thermostats
with SPI/3-Wire Interface
