12-Bit Plus Sign Temperature Sensors with SMBus/I2C-Compatible Serial

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12-Bit Plus Sign Temperature Sensors with SMBus/I2C-Compatible Serial

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19-2120; 8/01
12-Bit Plus Sign Temperature Sensors with SMBus/I2C-Compatible Serial Interface
MAX6633/MAX6634/MAX6635 combine temperature sensor, programmable overtemperature alarm, SMBusTM/I2CTM-compatible serial interface into single package. They convert their temperatures into digital values using internal analog-to-digital converters (ADCs). result conversion then held temperature register 12-bit sign value, allowing 0.0625°C resolution, readable time through serial interface. devices capable reading temperatures +150°C. MAX6633/MAX6634/MAX6635 feature shutdown mode that saves power turning everything except power-on reset (POR) serial interface. devices configured separate addresses, allowing multiple devices used same bus. MAX6633 four address pins, allowing devices connected single bus. MAX6634 three address pins, allowing eight devices connected single bus. MAX6635 address pins, allowing four devices connected single bus. MAX6633/MAX6634/MAX6635 make temperature data available transfer over serial interface. MAX6634 incorporates dual-mode ALERT output (open drain) serve upgraded alternative LM75. MAX6635 includes ALERT output OVERT output (both open drain) function upgraded replacement LM76 most applications. MAX6634/MAX6635 feature user-programmable temperature thresholds. three devices come 8-pin package. +5.5V Supply Range Accuracy ±1°C (0°C +50°C) ±1.5°C (-20°C +85°C) ±2.5°C (-40°C +125°C) ±2.5°C (+150°C) User-Programmable Temperature Thresholds (MAX6634/MAX6635) User-Configurable Alarm Output(s) (MAX6634/MAX6635) Ability Respond SMBus/I2C-Compatible Alert Response Address (MAX6634/MAX6635) OVERT Output System Shutdown (MAX6635) Multiple Devices devices (MAX6633) devices (MAX6634) devices (MAX6635)
Features
MAX6633/MAX6634/MAX6635
Ordering Information
PART MAX6633MSA MAX6634MSA MAX6635MSA TEMP. RANGE -55°C +150°C -55°C +150°C -55°C +150°C PIN-PACKAGE
Typical Operating Circuit
0.1µF +3.0V +5.5V
Applications
Battery Temperature Alarms Temperature Control Automotive Equipment
Configurations appear data sheet.
ALERT
INTERRUPT CONTROLLER SMBus/I2C MASTER
MAX6635
OVERT
SYSTEM SHUTDOWN
SMBus trademark Intel Corp. trademark Philips Corp.
Maxim Integrated Products
pricing, delivery, ordering information, please contact Maxim/Dallas Direct! 1-888-629-4642, visit Maxim's website www.maxim-ic.com.
12-Bit Plus Sign Temperature Sensors with SMBus/I2C-Compatible Serial Interface MAX6633/MAX6634/MAX6635
ABSOLUTE MAXIMUM RATINGS
VCC, SDA, .-0.3V +6.0V Other Pins .-0.3V +0.3V SDA, ALERT, OVERT Current .-1mA +50mA Protection (Human Body Model).2000V Continuous Power Dissipation +70°C) 8-Pin (derate 5.88mW/°C above +70°C).471mW Junction Temperature .+150°C Operating Temperature Range .-55°C +150°C Storage Temperature Range .-65°C +150°C Lead Temperature (soldering, 10s) .+300°C
Stresses beyond those listed under "Absolute Maximum Ratings" cause permanent damage device. These stress ratings only, functional operation device these other conditions beyond those indicated operational sections specifications implied. Exposure absolute maximum rating conditions extended periods affect device reliability.
ELECTRICAL CHARACTERISTICS
(VCC +3.0V +5.5V, -55°C +125°C, unless otherwise noted. Typical values +3.3V, +25°C, unless otherwise noted.)
PARAMETER Supply Range SYMBOL +50°C, +3.3V -20°C +85°C, +3.3V Accuracy (Note -40°C 125°C, +3.3V -55°C, +3.3V +150°C, +3.3V Power-Supply Rejection Ratio Threshold Hysteresis Supply Current Shutdown Average Operating Current Peak Operating Current (Note Conversion Rate DIGITAL INTERFACE Logic Input Voltage Logic Input High Voltage Input Leakage Current Output Sink Current Output Leakage Current Input Capacitance II_LEAK IO_LEAK +3.0V +5.5V +5.5V 0.6V (SMBDATA, ALERT, OVERT) ALERT, OVERT 0.65 +3.0V, SMBus inactive +5.5V, SMBus inactive +3.0V, SMBus inactive +5.5V, SMBus inactive +3.0V, SMBus inactive +5.5V, SMBus inactive PSRR CONDITIONS -1.0 -1.5 -2.5 -2.8 ±0.4 ±0.6 ±1.0 ±1.5 ±2.5 °C/V +1.0 +1.5 +2.5 +2.8 UNITS
TEMPERATURE-TO-DIGITAL CONVERTER CHARACTERISTICS
12-Bit Plus Sign Temperature Sensors with SMBus/I2C-Compatible Serial Interface
ELECTRICAL CHARACTERISTICS (continued)
(VCC +3.0V +5.5V, -55°C +125°C, unless otherwise noted. Typical values +3.3V, +25°C, unless otherwise noted.)
PARAMETER Serial Clock Frequency Free Time Between STOP START Condition START Condition Setup Time Repeat START Condition Setup Time START Condition Hold Time STOP Condition Setup Time Data Setup Time Data Hold Time (Note Receive SCL/SDA Rise Time SCL/SDA Fall Time (Note Clock Period Clock High Period SMBus Timeout tSU:STA tHD:STA tSU:STO tSU:DAT tHD:DAT tLOW tHIGH SMBDATA SMBCLK SMBCLK SMBDATA SMBDATA SMBCLK SYMBOL fSCL tBUF CONDITIONS UNITS
MAX6633/MAX6634/MAX6635
SMBus TIMING (Note Figures
Note Note Note Note
Guaranteed design characterization. Peak operating current measured during conversion. Figure Guaranteed design, production tested. master device must provide hold time least 300ns signal order bridge undefined region SCL's falling edge.
12-Bit Plus Sign Temperature Sensors with SMBus/I2C-Compatible Serial Interface MAX6633/MAX6634/MAX6635
Typical Operating Characteristics
(VCC +3.3V, +25°C, unless otherwise noted.)
SHUTDOWN SUPPLY CURRENT TEMPERATURE
MAX6633/4/5 toc01
AVERAGE SUPPLY CURRENT TEMPERATURE
MAX6633/4/5 toc02
TEMPERATURE ERROR SUPPLY NOISE FREQUENCY
SQUARE WAVE APPLIED WITH BYPASS CAPACITOR
MAX6633/4/5 toc03
SHUTDOWN SUPPLY CURRENT (µA)
AVERAGE SUPPLY CURRENT (µA)
TEMPERATURE ERROR (°C)
+5.5V
+5.5V
200mVp-p 200mVp-p
+3.3V TEMPERATURE (°C)
+3.3V
TEMPERATURE (°C)
SUPPLY NOISE FREQUENCY (Hz)
RESPONSE THERMAL SHOCK
TEMPERATURE (°C) TIME +5.5V DEVICE IMMERSED +85°C FLUORINERT BATH
MAX6633/4/5 toc04
TEMPERATURE ERROR TEMPERATURE
MAX6633/4/5 toc05
TEMPERATURE ERROR (°C)
+3.3V +5.5V
TEMPERATURE (°C)
12-Bit Plus Sign Temperature Sensors with SMBus/I2C-Compatible Serial Interface
Description
MAX6633 MAX6634 MAX6635 NAME ALERT OVERT FUNCTION Serial Data Input/Output. Open drain. Serial Clock Input Address Ground Address Address Address Supply Voltage Input. +3.0V +5.5V. Bypass with 0.1µF capacitor. ALERT Output. Open drain. OVERT Output. Open drain.
MAX6633/MAX6634/MAX6635
Detailed Description
MAX6633/MAX6634/MAX6635 continuously convert their temperatures into digital values using their integrated ADCs. resulting data readable time through SMBus/I2C-compatible serial interface. device functions slave SMBus interface, supporting Write Byte, Write Word, Read Byte, Read Word commands. Separate addresses configured using individual address pins. Figures show functional diagrams MAX6633/MAX6634/MAX6635, respectively.
devices connected single line. Table shows full SMBus/I2C address each device type.
Control Registers (MAX6633)
Three registers control operation MAX6633 (Figure Tables through Pointer register first addressed determines which other registers acted upon. other Temperature Configuration registers. temperature value stored bits plus sign bit, read only, contains latest temperature data. true register length bits, with lower unused this part. digital temperature data contained temperature register using two's-complement format with 1LSB corresponding 0.0625°C. Configuration register bits, read/write, contains SMBus timeout disable bit, fault queue enable bit, shutdown bit.
SMBus/I2C-Compatible Operation
MAX6633/MAX6634/MAX6635 readable programmable through their SMBus/I 2C-compatible serial interface. Figures show timing details clock (SCL) data (SDA) signals. devices function slaves SMBus support Write Byte, Write Word, Read Byte, Read Word commands. Figure MAX6633/MAX6634/ MAX6635 programmer's model.
Control Registers (MAX6634)
registers control operation MAX6634 (Figure Tables through pointer register first addressed determines which other five registers acted upon. other five Temperature, Configuration, High-Temperature HIGH Low-Temperature Hysteresis (THYST) registers. temperature value stored bits plus sign bit, read only, contains latest temperature data. true register length bits, with lowest used status bits, third (D2) unused. digital temperature data contained temperature register using two's-complement format with 1LSB corresponding 0.0625°C.
Addressing
Separate addresses configured using individual address pins. address each device selected connecting address (A_) pins potentials: VCC. MAX6635 makes address pins available (A0, A1), allowing four devices connected single line. MAX6634 makes three address pins available (A0, A2), allowing eight devices connected single line. MAX6633 makes four address pins available (A0, A3), allowing many
12-Bit Plus Sign Temperature Sensors with SMBus/I2C-Compatible Serial Interface MAX6633/MAX6634/MAX6635
Write Byte Format ADDRESS bits Slave Address: equivalent chip-select line 3wire interface Write Word Format ADDRESS bits Slave Address: equivalent chip-select line 3-wire interface COMMAND bits Command Byte: selects register writing DATA bits Data Byte: data goes into register command byte
COMMAND bits
Command Byte: selects register writing
DATA DATA bits bits (MSB) (LSB) Data Bytes: data goes into register command byte
Read Byte Format ADDRESS bits Slave Address: equivalent chip-select line COMMAND bits Command Byte: selects register reading from ADDRESS bits Slave Address: repeated change data-flow direction DATA bits Data Byte: reads from register command byte
Read Word Format ADDRESS bits Slave Address: equivalent chipselect line Start condition Stop condition
COMMAND bits
ADDRESS bits
Command Byte: selects register reading from Shaded Slave transmission acknowledged
Slave Address: repeated change data-flow direction
DATA DATA bits bits (MSB) (LSB) Data Bytes: reads from register command byte
Figure SMBus Protocols
tLOW
tHIGH
SMBCLK
SMBDATA tSU:STA tHD:STA tSU:DAT tHD:DAT ACKNOWLEDGE CLOCKED INTO MASTER DATA CLOCKED INTO SLAVE DATA CLOCKED INTO SLAVE SLAVE PULLS SMBDATA LINE
tSU:STO tBUF ACKNOWLEDGE CLOCKED INTO MASTER ACKNOWLEDGE CLOCK PULSE STOP CONDITION, DATA EXECUTED SLAVE START CONDITION
START CONDITION ADDRESS CLOCKED INTO SLAVE ADDRESS CLOCKED INTO SLAVE CLOCKED INTO SLAVE SLAVE PULLS SMBDATA LINE
Figure SMBus Write Timing Diagram
12-Bit Plus Sign Temperature Sensors with SMBus/I2C-Compatible Serial Interface MAX6633/MAX6634/MAX6635
tLOW SMBCLK tHIGH
SMBDATA
tSU:STA tHD:STA START CONDITION ADDRESS CLOCKED INTO SLAVE ADDRESS CLOCKED INTO SLAVE CLOCKED INTO SLAVE
tSU:DAT SLAVE PULLS SMBDATA LINE ACKNOWLEDGE CLOCKED INTO MASTER DATA CLOCKED INTO MASTER DATA CLOCKED INTO MASTER MASTER PULLS DATA LINE ACKNOWLEDGE CLOCKED INTO SLAVE ACKNOWLEDGE CLEAR PULSE
tSU:STO
tBUF
STOP CONDITION, DATA EXECUTED SLAVE START CONDITION
Figure SMBus Read Timing Diagram
CONVERSION PERIOD 0.5s MAX6633/MAX6634/MAX6635 0.25s CONVERSION TIME MAX6633/MAX6634/MAX6635
Figure Conversion Timing Diagram
Configuration register bits, read/write, contains SMBus timeout disable bit, fault queue enable bit, temperature alarm output polarity select bits, interrupt mode select bit, shutdown bit. Registers THIGH TLOW bits, read/write, contain values that trigger ALERT. Register THYST bits, read/write, contains values which temperature must rise fall beyond THIGH TLOW, before ALERT deasserts.
Control Registers (MAX6635)
Seven registers control operation MAX6635 (Figure Tables through Pointer register first addressed determines which other registers acted upon. other Temperature, Configuration, High-Temperature HIGH Low-Temperature Maximum Temperature (TMAX), Hysteresis (THYST) registers. temperature value stored bits plus sign bit, read only, contains latest temperature data. true register length bits, with lower three used status bits. digital temperature data contained temperature register using two's-complement format with 1LSB corresponding 0.0625°C. Configuration register bits, read/write, contains SMBus timeout disable bit, fault queue enable bit, temperature alarm output polarity select bits, interrupt mode select bit, shutdown
SIGN
CONFIGURATION
TEMPERATURE
SMBus INTERFACE
Figure MAX6633 Functional Diagram
12-Bit Plus Sign Temperature Sensors with SMBus/I2C-Compatible Serial Interface MAX6633/MAX6634/MAX6635
SIGN ALERT
CONFIGURATION
TEMPERATURE
TLOW
THIGH
SMBus INTERFACE
Figure MAX6634 Functional Diagram
OVERT
SIGN ALERT
CONFIGURATION
TEMPERATURE
TMAX
TLOW
THIGH
SMBus INTERFACE
Figure MAX6635 Functional Diagram
12-Bit Plus Sign Temperature Sensors with SMBus/I2C-Compatible Serial Interface MAX6633/MAX6634/MAX6635
DATA INTERFACE
ADDRESS
POINTER REGISTER (SELECTS REGISTER COMMUNICATION)
TEMPERATURE (READ ONLY) POINTER
CONFIGURATION (READ/WRITE, SETS OPERATING MODES) POINTER TMAX POINT (READ/WRITE) POINTER (MAX6635 ONLY)
THYST POINT (READ/WRITE) POINTER (MAX6634/MAX6635 ONLY)
TLOW POINT (READ/WRITE) POINTER (MAX6634/MAX6635 ONLY)
THIGH POINT (READ/WRITE) POINTER (MAX6634/MAX6635 ONLY)
Figure MAX6633/MAX6634/MAX6635 Programmer's Model
12-Bit Plus Sign Temperature Sensors with SMBus/I2C-Compatible Serial Interface MAX6633/MAX6634/MAX6635
TMAX TMAX THYST
THIGH THIGH THYST
TLOW THYST TLOW
ALERT COMPARATOR MODE ALERT INTERRUPT MODE OVERT COMPARATOR MODE ONLY
INTERRUPT MODE, READING DEVICE CLEARS ALERT. OTHERWISE, WOULD REMAIN INDEFINITELY UNTIL CLEARED.
Figure Alarm Output Reset Diagram
bit. Registers THIGH TLOW bits, read/write, contain values that trigger ALERT OVERT. Register THYST bits, read/write, contains values which temperature must rise fall beyond HIGH before ALERT OVERT deassert.
Fault Queue (MAX6634/MAX6635)
programmable fault queue MAX6634/ MAX6635 eliminates spurious alarm activity noisy environments. queue sets number consecutive out-of-tolerance temperature readings that must occur before ALERT OVERT alarm outputs toggled. out-of-tolerance reading above THIGH TMAX below TLOW. fault queue depth defaults power-up programmed-through Configuration register-to four consecutive conversions. time conversion result tolerance, particular alarm output asserted, queue cleared, even contains some out-of-tolerance counts. Additionally, fault queue automatically clears power-up shutdown. Whenever fault queue cleared, alarm outputs deasserted. Figure alarm output reset diagram.
Temperature Conversion
on-chip bandgap reference produces signal proportional absolute temperature (PTAT), well temperature-stable reference voltage necessary analog-to-digital conversion. PTAT signal digitized on-board resolution 0.0625°C. resulting digital value placed Temperature register. temperature conversion runs continuously asynchronously from serial interface rate 500ms conversion. When Temperature register read, conversion progress aborted. transaction completed stop condition.
12-Bit Plus Sign Temperature Sensors with SMBus/I2C-Compatible Serial Interface MAX6633/MAX6634/MAX6635
+5.5V HEATER
+5.5V
+12V 300mA MOTOR LOGIC-LEVEL MOSFET
RELAY 5VDC, 20mA 125VAC,
OVERT
MAX6634
ALERT 2N3904 HEATER SUPPLY
MAX6635
Figure Simple Thermostat
Figure Controller
Temperature Alert (MAX6634/MAX6635)
ALERT programmable polarity modes: comparator interrupt. Polarity mode selected through Configuration register (Table ALERT output open drain. Interrupt Mode With ALERT interrupt mode, MAX6634/MAX6635 look THIGH TLOW fault. ALERT asserts alarm undertemperature fault, well overtemperature fault. Once either fault occurred, remains active until deasserted read register. device then begins look temperature change crossing hysteresis level. activation ALERT subject depth fault queue. example: THIGH 100°C, THYST 20°C, fault queue depth ALERT does assert until four consecutive conversions exceed 100°C. temperature then read through I2C-compatible interface, ALERT deasserts. ALERT asserts again when four consecutive conversions less than 80°C. Comparator Mode comparator mode, ALERT asserted when number consecutive conversions exceeding value THIGH register, lower than value TLOW register, equal depth fault queue. ALERT deasserts when number consecutive conversions
less than THIGH THYST greater than TLOW THYST equal depth fault queue. example: THIGH 100°C, TLOW 80°C, fault queue depth four, ALERT does assert until four consecutive conversions exceed 100°C, below 80°C. ALERT only deasserts four consecutive conversions less than THIGH THYST greater than TLOW THYST. Comparator mode allows autonomous clearing ALERT fault without intervention master ideal driving thermostat (Figure 10).
Overtemperature Alarm (MAX6635)
MAX6635 also includes overtemperature output that always comparator mode. Whenever temperature exceeds value programmable TMAX register, OVERT asserted. OVERT only deasserts after temperature drops below TMAX THYST. When fault queue activated, OVERT subject that queue, which sets number faults that must occur before OVERT asserts deasserts. This helps prevent spurious alarms noisy environments. Comparator mode also allows autonomous clearing OVERT fault without intervention master thus ideal driving cooling (Figure 11). this application, polarity OVERT active high.
Shutdown
MAX6633/MAX6634/MAX6635 feature shutdown mode, accessible through serial interface that saves power turning everything except
12-Bit Plus Sign Temperature Sensors with SMBus/I2C-Compatible Serial Interface MAX6633/MAX6634/MAX6635
serial interface. Enter shutdown programming shutdown Configuration register high. While shutdown, Temperature register retains last conversion result read time. turned off, reducing device current draw 30µA (max). outputs ALERT OVERT latched upon entering shutdown, fault queue held reset. After coming shutdown, Temperature register continues read last converted temperature, until next conversion result available.
Table Address Selection
MAX6633 MAX6634 MAX6635 ADDRESS 1001 1001 1001 1001 ADDRESS 1001 1001 1001 1001 1001 1001 1001 1001 ADDRESS 1000 1000 1000 1000 1000 1000 1000 1000 1001 1001 1001 1001 1001 1001 1001 1001
Thermal Considerations
MAX6633/MAX6634/MAX6635 supply current typically 200µA when serial interface inactive. When used drive high-impedance loads, devices dissipate negligible power; therefore, temperature essentially same package temperature. accurate temperature monitoring good thermal contact between MAX6633/MAX6634/ MAX6635 package monitored device circuit. Heat flows plastic packages primarily through leads. Short, wide copper traces leading temperature monitor ensure that heat transfers quickly reliably. rise temperature self-heating given following formula: PDISSIPATION where DISSIPATION power dissipated MAX6633/MAX6634/MAX6635, package's thermal resistance. typical thermal resistance 170°C/W 8-pin package. limit effects self-heating, minimize output currents. example, MAX6634/MAX6635 sink with maximum ALERT specification 0.8V, additional 3.2mW power dissipated within This corresponds 0.54°C rise temperature.
Applications Information
Figure shows MAX6634 used simple thermostat control heating element. Figure shows MAX6635 used temperature-triggered controller.
Chip Information
TRANSISTOR COUNT: 12,085 PROCESS: BiCMOS
12-Bit Plus Sign Temperature Sensors with SMBus/I2C-Compatible Serial Interface MAX6633/MAX6634/MAX6635
Table Pointer Register Assignments
ADDRESS DESCRIPTION Temperature register (READ only) Configuration-Byte register THYST register TMAX register TLOW register THIGH register STATE 0000h 0100h 2800h 0500h 2000h
Table Temperature Register
(Sign) TMAX THIGH TLOW
D15: first sign bit. Flag bits TMAX, THIGH, TLOW. 1LSB 0.0625°C. Temperature stored two's complement format.
Table Configuration Register
Timeout Disable Fault Queue Enable ALERT Polarity OVERT Polarity Comparator Interrupt Shutdown
Power-on default normal operation; shutdown. comparator mode; interrupt mode. active low; active high. normal SMBus operation; full compatibility. Reserved locations, always write zeros.
12-Bit Plus Sign Temperature Sensors with SMBus/I2C-Compatible Serial Interface MAX6633/MAX6634/MAX6635
Table Fault Queue Depth
FAULTS (DEFAULT)
Table Output Code Temperature
TEMP. (°C) DIGITAL OUTPUT CODE BINARY +150.0000 +125.0000 +25.0000 +0.0625 0.0000 -0.0625 -25.0000 -55.0000 4B00 3E80 0C80 0008 0000 FFF8 F370 E470
0100 1011 0000 0XXX 0011 1110 1000 0XXX 0000 1100 1000 0XXX 0000 0000 0000 1XXX 0000 0000 0000 0XXX 1111 1111 1111 1XXX 1111 0011 0111 0XXX 1110 0100 0111 0XXX
Table THIGH, TLOW, TMAX, THYST Registers
(Sign)
Reads zeros, cannot written. 1LSB 1°C. Power-On Default: THIGH +64°C (2000h), TLOW +10°C (0500h), TMAX +80°C (2008h), THYST (0100h).
12-Bit Plus Sign Temperature Sensors with SMBus/I2C-Compatible Serial Interface
Configurations
VIEW
MAX6633/MAX6634/MAX6635
ALERT
MAX6633
ALERT
MAX6634
OVERT
MAX6635
12-Bit Plus Sign Temperature Sensors with SMBus/I2C-Compatible Serial Interface MAX6633/MAX6634/MAX6635
Package Information
SOICN.EPS
Maxim cannot assume responsibility circuitry other than circuitry entirely embodied Maxim product. circuit patent licenses implied. Maxim reserves right change circuitry specifications without notice time.
_Maxim Integrated Products, Gabriel Drive, Sunnyvale, 94086 408-737-7600 2001 Maxim Integrated Products Printed registered trademark Maxim Integrated Products.

12-Bit Plus Sign Temperature Sensors with SMBus/I2C-Compatible Serial

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