Thermal Management Product Guide What's inside? Page Thermocouple-to-Digital Converter . . . . . . . . . . . . . . 2 Fan Controllers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 High-Accuracy Sensors . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Low-Voltage Sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Edition 2, March 2011 Page Multichannel Sensors. . . . . . . . . . . . . . . . . . . . . . . . . . 10 Temperature Switches . . . . . . . . . . . . . . . . . . . . . . . . . 12 LM75-Compatible Products . . . . . . . . . . . . . . . . . . . . 13 Selection Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Accurate Thermocouple-to-Digital Converter Simplifies Designs and Cuts System Cost The MAX31855 integrates all the required functions of a discrete solution, including an ADC, precision amplifier, temperature sensor for cold-junction compensation, and a 3-wire interface. By combining these components in a single IC, the MAX31855 simplifies design, reduces development time, and saves both component cost and board space. The device also provides 2.0C accuracy for temperatures ranging from -200C to +700C for a K type thermocouple, with no calibration required. The MAX31855 is ideal for industrial and temperature controls, fuel cells, HVAC, and automotive applications. All these functions in one SO package! VOLTAGE REFERENCE MAX31855 TEMP SENSOR THERMOCOUPLE AMP IN1 IN2 ADC TO MICROCONTROLLER VBIAS Industrial Controls Improves and Speeds System Design * Performs cold-junction compensation * 14-bit, 0.25C resolution * Versions available for K, J, N, S, T, E, and R type thermocouples * Simple SPITM-compatible interface * Measures thermocouple inputs from -270C to +1800C SPI is a trademark of Motorola, Inc. 2 HVAC Systems Temperature Controllers Integrated Solution Saves Space and Cuts BOM Cost * Eliminates need for multiple discrete components * Available in an 8-pin SO package Simplified System Fault Management and Troubleshooting Improve Reliability * Detects thermocouple shorts to GND or VCC * Detects open thermocouple Choosing the Right Fan Controller Maxim offers over 20 products with fan-control functions. This design note helps you to narrow the choice in two simple steps. Step 1: Start with the Fan Fans are usually described by the number of wires. A 2-wire fan has just two power-supply leads. A 3-wire fan adds an output, usually a "tachometer" output that produces a square wave with a fixed number of pulses per fan revolution. The tachometer signal can monitor fan speed and serve as a feedback signal when closedloop control of speed is necessary. A 4-wire fan also includes a speed-control input that accepts a PWM signal whose duty cycle controls the fan's speed. Step 2: Pick the Speed-Adjustment Method Typically, fan control reduces the audibility of fan noise, so the preferred approach is to gradually adjust fan speed in response to temperature changes. If a 4-wire fan is used, it is easy to adjust the fan's speed: just drive the speed-control input with a PWM signal in the 20kHz to 40kHz range. In Figure 1, the MAX6639 fan controller regulates the speed of two fans by adjusting the PWM waveforms' duty cycles to produce the desired speed as indicated by the fans' outputs. In contrast, 2- and 3-wire fans require a more complex control scheme. PWM drive works, but instead of driving the fan's speed-control input, the PWM signal drives a power-supply pass transistor. The optimum frequency is in the 30Hz range. Note that this approach can be noisy--each edge of the PWM waveform can cause an audible transient due to motion of the fan motor assembly. Also, some fan manufacturers recommend against PWM on the fan's power supply due to reliability concerns. Be sure to check with your fan vendor before proceeding with this approach. Another way to control the speed of a 2- or 3-wire fan is to linearly vary the fan's power-supply voltage. You lose a bit of efficiency, but the approach is both quiet and reliable. A few fan controllers, such as the MAX6620 (Figure 3), can produce a variable fan supply voltage controlled over a bus such as I2C. You can also generate an adjustable linear fan supply by using a PWM-output fan controller and adding a lowpass filter and power amplifier, as shown in Maxim application notes "Circuit Converts PWM to Amplified and Buffered Linear Signal" (www.maxim-ic.com/AN3149) and "Circuit Converts PWM Fan Drive to Linear and Reduces Acoustic Noise" (www.maxim-ic.com/AN3530). If the fan will be used infrequently or located far from users, the acoustic noise may not be important. In this case, you can implement very simple, low-cost fan control using a temperature switch to turn a fan on and off. In the Figure 2 example, the temperature switch's output directly drives the control input of a 4-wire fan. For 2- or 3-wire fans, the temperature switch in Figure 4 drives the gate of a power transistor that enables or disables the fan's power supply. Note that switching the fan on and off suddenly is very audible and, therefore, is rarely appropriate for consumer or office equipment that will be located close to users. Fan Control Type Linear Control PWM Control On/Off (Noise and Power-Supply Stress Are Not Concerns) 2-Wire and 3-Wire Fans 4-Wire Fans Control Method Maxim Solution* Control Method Maxim Solution* Linear fan controller MAX6620 (Figure 3) N/A N/A PWM fan controller + lowpass filter + pass device MAX6639, MAX6615, MAX6641 (refer to app notes 3149 and 3530) N/A N/A Low-frequency PWM controller + pass device MAX6639, MAX6615, MAX31782, MAX31785 High-frequency PWM controller MAX6639 (Figure 1), MAX6615, MAX31782, MAX31785 Temperature switch + pass device MAX6510 (Figure 4) Temperature switch MAX6510 (Figure 2) *Single output configurable as an interrupt or square wave. 3 Choosing the Right Fan Controller (cont.) UsingFan a 4-Wire Fan Using a 4-Wire 4-WIRE FAN 4-WIRE FAN VFAN VFAN TACH OR LOCKED ROTOR (OPEN DRAIN) TACH OR LOCKED ROTOR (OPEN DRAIN) PWM PWM Variable Variable speed control for speed control for minimal audible noise minimal audible noise Simple on/off control when acoustic noise is not a concern Simple on/off control when acoustic noise is not a concern VFAN VFAN VCC VCC VFAN DXP1 REMOTE PWM OUT 1 AND LOCAL TEMP SENSOR TACH IN 1 TACH DXP2 TACH FEEDBACK FEEDBACK PWM OUTAND 2 PWM AND PWM SMBus TOSMBus SMBDATA GENERATOR GENERATOR INTERFACE INTERFACE SMBus AND CONTROLTACH IN 2 AND CONTROLSMBCLK MASTER REGISTERS REGISTERS VCC VCC DXP2 TO SMBus MASTER MAX6639 MAX6639 DXP1 REMOTE AND LOCAL TEMP SENSOR DXN SMBDATA SMBCLK VCC DXN ALERT ALERT 2.7V TO 5.5V 2.7V TO 5.5V VCC VCC TACH IN 2 VCC TO SYSTEM SHUTDOWN VCC ALARM LOGIC FANFAIL THERM THERM TO CLOCK THROTTLE TACH IN 1 PWM OUT 2 VCC ALARM LOGIC TO CLOCK THROTTLE PWM OUT 1 OT OT VCC VCC FANFAIL Figure 1. PWMfans. control of 4-wire fans. Figure 1. PWM control of 4-wire OUTSET OUTSET SET HYST MAX6510 SET GND OUT HYST PWM MAX6510 VFAN VFAN OUT PWM TACH TACH GND Figure On/off fan control a 4-wire fan switch. with a temperature switch. Figure 2. On/off control of 2. a 4-wire withofa temperature 4 VFAN TO SYSTEM SHUTDOWN Choosing the Right Fan Controller (cont.) Using a 2- or 3-Wire Fan Variable linear drive for minimal audible noise 2-WIRE FAN 3-WIRE FAN VFAN VFAN VFAN VFAN DACOUT1 DACFB1 3.0V TO 5.5V TACH OR LOCKED ROTOR (OPEN DRAIN) F A N 1 TACH1 VFAN MAX6620 FAN_FAIL DACOUT2 DACFB2 SDA F A N 2 TACH2 SCL Simple on/off control when acoustic noise is not a concern DAC_START SPINUP_START I2C INTERFACE, REGISTERS, CONTROL LOGIC DAC/LDO DRIVER, TACH MONITOR VFAN DACOUT3 DACFB3 WD_START XTAL F A N 3 TACH3 XTAL VFAN DACOUT4 DACFB4 TACH4 F A N 4 Figure 3. Fan-speed control of a 2- or 3-wire fan by varying the fan's power-supply voltages. VFAN 2.7V TO 5.5V 2- OR 3-WIRE FAN VCC OUTSET SET HYST MAX6510 OUT GND Figure 4. On/off control of a 2- or 3-wire fan using a temperature switch and pass transistor. 5 Industry's First 6-Channel, Intelligent Fan Controller Optimizes System Efficiency and Reliability The MAX31785 saves system power by operating fans at the lowest possible speeds to reduce audible noise, extend fan life, and minimize system maintenance. This intelligent fan controller provides closed-loop fan control of six independent fans, based on the measurements of up to 11 available temperature-sensing sources. Alternately, an external host can manually command the fan speeds, while the component automatically adjusts them. To further improve system reliability, the MAX31785 contains a fan-healthdiagnostic function to help users predict impending fan failures. OPTIONAL SUPPORT FOR TWO FANS UP TO 4 CHANNELS 6 CHANNELS MSDA DS75LV I2C TEMP PWM0 SPDT MUX TACH0 MSCL RS+0 FROM TACHSEL SENSOR RS-0 +3.3V VDD PWM1 TACH1 Servers VSS SDA RS+1 MAX31785 SCL RST ALERT HOST INTERFACE FAULT A0 CONTROL A1/TACHSEL REMOTE TEMPERATURE DIODE RS-1 EACH CHANNEL CAN READ A REMOTE TEMPERATURE DIODE OR A REMOTE VOLTAGE PWM2 TACH2 RS+2 RS-2 PWM3 REMOTE VOLTAGE TACH3 RS+3 RS-3 PWM4 TACH4 RS+4 RS-4 REG18 PWM5 TACH5 RS+5 REG25 RS-5 Fan Trays Network Switches Integrates All Functions for Controlling Multiple Fans * 6 independent channels of fan control support 3-wire and 4-wire fans * User-selectable RPM- or PWM-based fan control eases system design * Staggered fan spin-up eases power-supply stress * 11 temperature-sensing sources monitor multiple hot spots * Fault detection on all fans and temperature sensors improves reliability * PMBusTM-compliant command interface * I2C/SMBus-compatible serial bus with bus timeout function * Available in a 40-pin TQFN-EP package PMBus is a trademark of SMIF, Inc. 6 Industry's Highest Accuracy Temp Sensors We offer a broad range of temperature devices with an accuracy of 0.5C (max) over wide temperature and voltage ranges. Several popular digital-communication interfaces, including analog output, support a wide range of applications. 0.5C Accuracy over Temperature and Voltage ERROR (C) 0.8 0.6 0.4 0.2 +3 0 -0.2 -0.4 -0.6 -0.8 MEAN -3 0 10 20 30 40 50 60 REFERENCE TEMPERATURE (C) 70 Base Stations Temperature Recorders Network Switches/Routers Highest Accuracy Temp Sensors Interface Accuracy (C) Supply Voltage Range (V) Package DS18B20 1-Wire 0.5 (-10 to +85) 3.0 to 5.5 3-TO92, 8-SOP (MAX), 8-SO DS1620 3-wire DS1631/DS1631A 2-wire DS1626 3-wire DS620 2-wire DS600 Analog DS7505 Part MAX31723 8-SO 0.5 (0 to +70) 2.7 to 5.5 8-SOP (MAX), 8-SO 8-SOP (MAX) 1.7 to 3.5 8-SOP-EP (MAX-EP) 0.5 (-20 to +100) 2.7 to 5.5 8-SOP-EP (MAX-EP) 2-wire 0.5 (0 to +70) 1.7 to 3.7 8-SOP (MAX), 8-SO SPI/3-wire 0.5 (0 to +70) 1.7 to 3.7 8-SOP (MAX) 1-Wire and MAX are registered trademarks of Maxim Integrated Products, Inc. 7 Most Complete Portfolio of Low-Voltage Temp Sensor ICs Maxim offers a variety of temperature devices with supply voltages as low as 1.7V. Our portfolio includes both digital and analog sensors, with several accuracy grades to choose from. The low operating voltages simplify design in systems operating from commonly used low-voltage rails, as well as power-sensitive systems. High accuracy (0.5C) - DS7505 - DS620 - MAX31723 Tiny SC70 package - MAX6607 - MAX6613 0001 1010 VCC 1.8V Analog or digital outputs V T Thermostat function - DS7505 (NV thresholds) - DS620 (NV thresholds) - DS75LV/LX - MAX31722/23 Industry-standard compatibility - DS75LV/LX (LM75) - DS7505 (LM75) - MAX6613 (LM20) * Low supply voltage * 1.7V for digital temperature sensors * 1.8V for analog temperature sensors * 2-wire, SPI/3-wire, and analog options * -55C to +125C operating range (up to +130C for the MAX6613) * No external components required to measure temperature * User-selectable 9- to 12-bit resolution * Multiple packaging options, down to 5-pin SC70 Low-Voltage Temperature Sensors Supply Voltage (V) Accuracy (C) Package 1.7 to 3.7 0.5 (0 to +70) 8-SOP (MAX), 8-SO 1.7 to 3.5 0.5 (0 to +70) 8-SOP-EP (MAX-EP) 1.7 to 3.7 2.0 (-25 to +100) 8-SOP (MAX), 8-SO DS75LX 1.7 to 3.7 2.0 (-25 to +100) 8-SOP (MAX), 8-SO MAX6607 1.8 to 3.6 3.5 (0 to +70) 5-SC70 1.8 to 3.6 3.5 (0 to +70) 5-SOT23 1.8 to 5.5 4.0 (0 to +50) 5-SC70 1.7 to 3.7 2.0 (-40 to +85) 8-SOP (MAX) 1.7 to 3.7 0.5 (0 to +70) 8-SOP (MAX) Part Interface DS7505 DS620 DS75LV MAX6608 2-wire Analog MAX6613 MAX31722 MAX31723 8 SPI/3-wire Industry's First SPI/3-Wire Temperature Sensor Operates from a Supply Voltage as Low as 1.7V Accurate Temperature Sensor Enables Easy Implementation into Low-Power Systems The MAX31723 SPI/3-wire temperature sensor provides measurements within 0.5C over a wide temperature range of 0 to +70C. That accuracy, coupled with its low supply-voltage operation of 1.7V to 3.7V, aids designers in meeting error and power budgets. Also available in a 2.0C version! Choice of SPI or 3-wire interface is user selectable VDD PRECISION REFERENCE OVERSAMPLING MODULATOR Configurable as a stand-alone thermostat that requires no host processor overhead DIGITAL DECIMATOR VDD SDI CONFIGURATION/ STATUS REGISTER SDO SCLK CE SERMODE GND I/O CONTROL AND INPUT SENSE MAX31723 TEMPERATURE REGISTER TOUT THIGH AND TLOW REGISTERS THERMOSTAT COMPARATOR Nonvolatile thermostat registers eliminate need for programming at power-up Highly Versatile Temp Sensor Eases System Design * Two accuracy versions * MAX31723: 0.5C from 0C to +70C; 2.0C from -55C to +125C * MAX31722: 2.0C from -40C to +85C; 3.0C from -55C to +125C * Low 1.7V to 3.7V supply-voltage operating range * Thermostat output with NV registers * 9- to 12-bit resolution (0.5C to 0.0625C) * -55C to +125C operating range * SPI or 3-wire communication, user selectable * Available in 8-pin MAX package 9 Using Multichannel Temperature Sensors to Save Space and Cost When a circuit board includes multiple hot spots, standard practice is to monitor the temperatures of those locations to avoid performance degradation and even catastrophic failure. A conventional approach is shown in Figure 1, where a sensor is placed near each hot spot. Monitoring board hot spots can be done with standard local sensors (TS5-TS8). If a thermally sensitive component has a temperature-sensing transistor (also called a "thermal diode") integrated on the die of a high-temperature IC, a remote-temperature sensor can use the IC's thermal diode to accurately measure its die temperature (TS1-TS4). Figure 2 shows the same board, but in this case, a single multichannel sensor IC monitors all of the hot spots. The circuit uses the MAX6581 (also see Figure 3), which can measure up to seven external temperatures as well as its own temperature. The device can monitor temperatures on ASICs, CPUs, and FPGAs using thermal diodes, or measure board hot spots using discrete diode-connected transistors and the internal local sensor. Using a single IC to monitor several locations reduces sensor cost. It also simplifies the design by allowing several channels of temperature data to be read from a single I2C slave address. Features in Multichannel Temperature Sensors * Overtemperature Alarm Outputs. These outputs are useful if you need a signal to indicate that one of the thermal channels has exceeded its temperature limit. * Bus Timeout. Useful on I2C and SMBus sensors, this timeout resets the bus if the IC holds the data line low for more than a preset limit (usually around 35ms), thus preventing the IC from locking up the bus. * Resistance Cancellation. Excess resistance (more than a few ohms) in the remote-diode path will cause measurement errors. These errors are predictable if you know the resistance value. If you do not, resistance cancellation is helpful to eliminate series-resistance errors. * Beta Compensation. Measurement errors can result when a target IC's thermal diode has very low beta (e.g., less than one). If your thermal diode's beta is low, a sensor with beta compensation will improve accuracy. * Thermistor Inputs. A thermistor can be helpful for measuring temperature. For example, you can use a thermistor with long leads to monitor air temperature above the surface of a board. Maintaining Good Measurement Accuracy * If discrete diode-connected transistors are used, either pnps or npns will work. Use small-signal transistors with consistent beta greater than 50. * Separate the thermal diode's signal traces from high-speed and high-current traces to avoid noise pickup. * Use a filter capacitor at the thermal-diode inputs (DXP and DXN). See the sensor data sheet for the optimum value. * Most multichannel sensors bias the thermal diode's cathode about 0.6V. If you want to measure the temperature of an IC with the thermal diode's cathode grounded, use one of Maxim's many multichannel sensors that specifies accuracy with a grounded cathode. 10 Using Multichannel Temperature Sensors (cont.) Conventional Approach Using Multiple Sensors TS8 LOCAL ASIC Improved Approach Using One Multichannel Sensor ASIC CPU HOT SPOT CPU HOT SPOT ASIC TS2 REMOTE TS4 REMOTE TS1 REMOTE ASIC TS7 LOCAL MAX6581 MULTICHANNEL SENSOR HOT SPOT TS3 REMOTE TS5 LOCAL TS6 LOCAL HOT SPOT HOT SPOT HOT SPOT FPGA HOT SPOT FPGA HOT SPOT Figure 2. The MAX6581 can monitor up to seven external temperatures as well as its own die temperature. This approach saves space and cost by eliminating multiple discrete sensors. Figure 1. The conventional way to monitor multiple hot spots is to mount one temperature sensor at each location. Small, 4mm x 4mm, 24-pin TQFN package CPU SMBDATA SMBCLK GND DXP1 DXN1 FPGA DXP2 ALERT DXN2 VCC (3.3V) DXP3 OVERT MAX6581 DXN3 STBY DXP4 DXP7 HOT SPOT 1 DXN7 DXP6 DXN6 DXN5 DXP5 DXN4 ASIC HOT SPOT 4 HOT SPOT 2 HOT SPOT 3 Figure 3. The MAX6581 monitors a total of eight temperature locations with 1C accuracy. Highly Accurate MAX6581 Reduces Component Count * 1 local and 7 remote temperature channels replace up to 8 individual sensors * Remote-sensing channels monitor ASICs, FPGAs, CPUs, and board hot spots * 1C remote-temperature accuracy (+60C to +100C) * All remote channels have series-resistance cancellation 11 Industry's Most Comprehensive Portfolio of Temp Switches Temperature switches provide simple protection from potentially damaging thermal conditions by generating an over- or undertemperature signal when the temperature is outside the safe operating range. Whatever kind of temperature switch you need--factory preset, resistor adjustable, pin strapped, or remote-diode sensing--Maxim has you covered. Factory-Preset Trip Thresholds Resistor-Adjustable Trip Thresholds MAX6501-MAX6508 MAX6514-MAX6519 MAX6509/MAX6510 2.7V TO 5.5V 2.7V TO 5.5V 2.7V TO 5.5V 2.7V TO 5.5V VCC VCC 2.7V TO 5.5V 2.7V TO 5.5V 2.7V TO 5.5V 2.7V TO 5.5V Industry's Industry's Industry's Industry's most most most mostaccurate accurate accurate accurate (1.5C) (1.5C) (1.5C) (1.5C) VCC VCC VCC VCC SET MAX6509MAX6509 MAX6509 MAX6509 RSET RSET TOVER TOVER TOVER TOVER GND HYST GNDHYST GND GND HYST GND GND HYST GND GND TOVER TOVER GND HYST GNDHYST HYST HYST GND GND TOVER TOVER Local/Remote with Pin-Strapped Local Threshold MAX6513 (Preset) MAX6685/MAX6686 (Pin Strapped) MAX6687/MAX6688 3.3V TO SYSTEM TO SYSTEM SHUTDOWN 3.3V SHUTDOWN TO SYSTEM TO SYSTEM SHUTDOWN SHUTDOWN 3.3V VDD VDD DXPVDD THIGH THIGH DXP VDD DXP DXP CS CS DXN S1 S2 THIGH12V 12V THIGH 3.3V 3.3V 12V 12V CS MAX6685 MAX6685 CS MAX6685 DXN MAX6685 DXN S1 S2 12 RSET RSET Remote with Preset or Pin-Strapped Thresholds 3.3V CPU CPU CPU CPU SET SET SET MAX6515MAX6515 MAX6515 MAX6515 VCC VCC DXN S1 S1 S2 S2 GND GND DXP CPU CPU CPU CPU DXP CS CS DXN S1 TLOW TLOW GND GND TLOW TLOW N N N N S2 VDD DXPVDD DXP 3.3V 3.3V VDD VDD 3.3V CS MAX6687 MAX6687 CS MAX6687 DXN MAX6687 DXN S1 S2 3.3V 3.3V 3.3V TREMOTE DXN TREMOTE S1 TREMOTE TREMOTE TO SYSTEM TO SYSTEM S1 TLOCAL TLOCAL S2 SHUTDOWN SHUTDOWN TO SYSTEM TO SYSTEM TLOCAL TLOCAL S2 SHUTDOWN SHUTDOWN GND GND GND GND LM75-Compatible Temp Sensors--from Industry Standard to Best in the Industry Maxim offers more than a dozen "LM75-compatible" temperature sensors that give you options ranging from industry-standard configurations to sensors with dramatically improved performance. Whether you need an alternate source for the standard LM75 or a temperature sensor that offers best-in-class performance, you will find what you are looking for at Maxim. 0.5C Accuracy and Nonvolatile Memory If you need better accuracy than the LM75 can achieve, select the DS7505, a pin- and register-compatible upgrade with superior accuracy. The DS7505 features a maximum temperature-measurement error of 0.5C from 0C to +70C across its full power-supply range. The device operates from a 1.7V to 3.6V supply-voltage range, making it ideal for low-voltage systems. The DS7505's conversion resolution is programmable from 0.5C to 0.0625C (9 to 12 bits). For systems that require the OS trip threshold to be the correct value at power-up, the DS7505's threshold is stored in nonvolatile memory. This is an especially powerful feature when using OS for system protection--for example, to disable the system's power supply when the measured temperature is too high. Other Improvements Maxim offers other LM75-compatible digital temperature sensors with a variety of improved features. Because temperature accuracy is guaranteed across the full supply-voltage range instead of just at 3.3V or 5.0V, all of these products have better accuracy than the LM75 in real systems. An example is the DS75LX, which operates from power-supply voltages as low as 1.7V. This device is ideal for designs that require more than eight sensors on a single bus; its three address-selection inputs use three-state logic, resulting in 27 available slave addresses. Products such as the MAX7501-MAX7504 offer another useful feature: an input that resets the I2C interface. Pulling this input low returns the internal registers to their default values and resets the I2C interface, thus allowing the I2C master to reset any slaves on the board when a communications fault is detected. Lastly, if you need a smaller footprint, choose the MAX6625, MAX6626, or DS1775. These devices are all register compatible with the LM75 and are available in space-saving, 3mm x 3mm SOT23 or TDFN packages. Maxim's Industry-Standard, LM75-Compatible Temp Sensors Maxim Sensor Features Benefits DS7505 0.5C accuracy, NV memory, 1.7V to 3.6V supply range Better accuracy, fail-safe overtemperature detection DS75LV 1.7V to 3.7V supply range Compatible with low-voltage, low-power designs I2C DS75LX 1.7V to 3.7V supply range, 27 addresses DS75 Fully compatible Accuracy guaranteed across full supply voltage MAX7500 Fully compatible Accuracy guaranteed across full supply voltage MAX7501-MAX7504 I2C Allows controller to reset I2C interface MAX6625/MAX6626 3mm x 3mm, 6-pin TDFN package Ideal for space-limited designs DS1775 3mm x 3mm, 5-pin SOT23 package Ideal for space-limited designs reset input Up to 27 sensors can be on a single bus www.maxim-ic.com/TempSensors 13 Description Remote temp sensors with SPI interface Thermistor-to-digital converter 8-channel, 1C accurate temp monitor 5-channel temp monitor (4 remote, 1 local) with standby Remote/local temp monitor with 2 independent SMBus interfaces Remote/local temp sensor with overtemp alarm Remote/local temp sensors with overtemp alarms Remote/local temp sensors with overtemp alarms Remote/local temp sensor with resistance cancellation and overtemp alarm 2-channel remote/local temp sensors and 4-channel voltage monitors Remote/local temp sensors with overtemp alarms Fail-safe remote/local temp sensors with overtemp alarms 7-channel temp monitor (6 remote, 1 local) with standby Remote/local temp sensor with resistance cancellation and overtemp alarm Dual remote/local temp sensors with fixed or pin-selectable SMBus address 7-channel temp monitor (6 remote, 1 local) 7-channel temp monitor (3 remote, 1 local, 3 thermistor) 5-channel temp monitor (4 remote, 1 local) Description Programmable digital thermostat and thermometer Econo 1-Wire digital thermometer Precision 1-Wire digital thermometer with 4-bit ID Precision digital thermometer Precision digital thermometer Precision digital thermometer with sequence detect and GPIO Temp sensor with single-wire time-delay interface Temp sensors with single-wire period output/frequency output Precision digital thermometer and thermostat Precision digital thermometer and memory Precision digital thermometer and thermostat Econo digital thermometer and thermostat Digital thermometer Digital thermometer and thermostat Digital temp sensors with SPI interface 12-bit + sign SPI temp sensor Digital thermometer and real-time clock (RTC) Precision digital thermometer and thermostat Digital thermometer and thermostat Digital thermometer and thermostat Digital thermometer and thermostat Low-voltage, precision digital thermometer and thermostat Digital thermometer and thermostat Low-voltage digital thermometer and thermostat Digital thermometer and thermostat with extended addressing Digital temp sensor and thermal watchdog (LM75 second source) Temp monitor for DDR memory modules Digital temp sensors with overtemp alarm Digital temp sensors with overtemp alarms and 4/3/2 address pins Digital temp sensors and 4-channel voltage monitor Digital temp sensors with overtemp alarm (LM75 compatible) Low-voltage, SPI/3-wire temperature sensor Low-voltage, SPI/3-wire precision temperature sensor Interface 1-Wire 1-Wire 1-Wire 1-Wire 1-Wire 1-Wire Single wire Single wire 3-wire 3-wire 3-wire 3-wire SPI/3-wire 3-wire 3-wire 3-wire I2C/SMBus I2C/SMBus I2C/SMBus I2C/SMBus I2C/SMBus I2C/SMBus I2C/SMBus I2C/SMBus I2C/SMBus I2C/SMBus I2C/SMBus I2C/SMBus I2C/SMBus I2C/SMBus I2C/SMBus SPI/3-wire SPI/3-wire Interface 3-wire 3-wire I2C/SMBus I2C/SMBus I2C/SMBus I2C/SMBus I2C/SMBus I2C/SMBus I2C/SMBus I2C/SMBus I2C/SMBus I2C/SMBus I2C/SMBus I2C/SMBus I2C/SMBus I2C/SMBus I2C/SMBus I2C/SMBus Accuracy (C) 1 3 LSB 1 1 2 1 1 0.8 2 1.5 1 1 1 2 1.5 1 1 1 Accuracy Range (C) 0 to +85 -10 to +85 -10 to +85 -10 to +85 -10 to +85 -10 to +85 +85 +85 0 to +70 0 to +70 0 to +70 -55 to +125 -40 to +85 -10 to +85 0 to +70 0 to +70 -10 to +85 0 to +70 -10 to +85 -10 to +85 -10 to +85 0 to +70 -25 to +100 -25 to +100 -25 to +100 -25 to +100 +40 to +125 0 to +70 -20 to +125 -20 to +80 -25 to +100 -40 to +85 0 to +70 Local Sensor -- -- Accuracy (C) 1 2 0.5 0.5 0.5 0.5 4.5 4.5/3.5 0.5 0.5 0.5 2.5 2 1 1 1.6 2 0.5 1 1 2 0.5 2 2 2 2 2 2 1.5 3 2 2 0.5 Remote Sensors 1 1 7 4 1 1 1 1 1 2 1 1 6 1 2 6 6 4 Footprint (mm2) 9 15 16 30 16 9 15 15 30 30 30 30 30 30 15 30 30 30 Footprint (mm2) 30 30 15 15 30 15 9 9 30 30 15 30 15 15 9 30 30 30 30 15 9 15 15 15 15 15 6 9 30 15 15 15 15 Package 8-TDFN, 8-SOT23 8-MAX 24-TSSOP 16-TSSOP 16-TQFN 6-TDFN 8-MAX 8-MAX, 8-SO 16-QSOP 16-QSOP 8-SO, 16-QSOP 16-QSOP 20-TSSOP, 20-QSOP 16-QSOP 10-MAX 20-TSSOP, 20-QSOP 20-TSSOP, 20-QSOP 16-TSSOP, 16-QSOP Package 8-SO, PR35 8-SO, TO-92 8-MAX 8-SOP, 8-SO, TO-92 8-SO, TO-92 8-SOP 6-SOT23 6-SOT23 8-SO, 8-DIP 8-SO, 8-DIP 8-MAX 8-SO 8-MAX, 8-SO 8-MAX 6-TDFN, 6-SOT23 8-SO 8-SO 8-MAX, 8-SO 8-MAX, 8-SO 8-MAX 5-SOT23 8-MAX 8-MAX, 8-SO 8-MAX, 8-SO 8-MAX, 8-SO 8-MAX, 8-SO 8-TDFN, 8-TSSOP 6-TDFN, 6-SOT23 8-SO 10-MAX 8-MAX, 8-SO 8-MAX 8-MAX IDD (A, max) 400/50 300 1000 1000 950 1000 400 400 1000 1000 1000 1000 1000 70 1000 1000 1000 1000 IDD (A, max) 1000 1500 1500 1500 1500 1500 250 250 1000 1000 1000 1000 500 400 400/50 600 1000 1000 1000 1000 1000 800 1000 1000 1000 500 500 1000 350 500 500 1200 1200 VCC Supply Range (V) 3.0 to 5.5 3.0 to 5.5 3.0 to 5.5 3.0 to 5.5 3.0 to 5.5 3.0 to 5.5 3.0 to 5.5 3.0 to 5.5 3.0 to 5.5 3.0 to 5.5 3.0 to 5.5 3.0 to 5.5 3.0 to 5.5 3.0 to 5.5 3.0 to 5.5 3.0 to 5.5 3.0 to 5.5 3.0 to 5.5 VCC Supply Range (V) 2.7 to 5.5 3.0 to 5.5 3.0 to 3.7 3.0 to 5.5 3.0 to 5.5 3.0 to 5.5 2.7 to 5.5 2.7 to 5.5 2.7 to 5.5 2.7 to 5.5 2.7 to 5.5 2.7 to 5.5 2.65 to 5.5 2.7 to 5.5 3.0 to 5.5 3.0 to 5.5 2.2 to 5.5 2.2 to 5.5 2.7 to 5.5 2.2 to 5.5 2.7 to 5.5 1.7 to 3.5 2.7 to 5.5 1.7 to 3.7 1.7 to 3.7 3.0 to 5.5 2.7 to 3.6 3.0 to 5.5 3.0 to 5.5 2.7 to 5.5 3.0 to 5.5 1.3 to 3.7 1.3 to 3.7 Operating Temp Range (C) -55 to +125 -55 to +125 -40 to +125 -40 to +125 -40 to +125 -40 to +125 -55 to +125 -55 to +125 -55 to +125 -55 to +125 -55 to +125 -55 to +125 -40 to +125 -55 to +125 -40 to +125 -40 to +125 -40 to +125 -40 to +125 Operating Temp Range (C) -55 to +125 -55 to +125 -55 to +125 -55 to +125 -55 to +125 -40 to +85 -55 to +125 -55 to +125 -55 to +125 -55 to +125 -55 to +125 -55 to +125 -55 to +125 -55 to +125 -55 to +150 -55 to +150 -55 to +125 -55 to +125 -55 to +125 -55 to +125 -55 to +125 -55 to +125 -55 to +125 -55 to +125 -55 to +125 -55 to +125 -20 to +125 -55 to +125 -55 to +150 -40 to +125 -55 to +125 -55 to +125 -55 to +125 Accuracy Range (C) 0 to +125 -- +60 to +100 +60 to +100 +25 to +100 +60 to +100 +60 to +145 +25 to +125 +70 to +100 +60 to +100 +60 to +100 +60 to +100 +60 to +100 +70 to +100 +60 to +100 +60 to +100 +60 to +100 +60 to +100 Price ($) 2.01 1.61 1.70 1.76 2.09 2.25 0.79 0.79 2.89 3.75 1.66 2.26 1.10 1.61 1.39 1.44 3.22 1.66 1.61 1.61 0.88 1.66 0.90 0.90 0.75 0.65 0.95 0.90 1.28 1.84 0.72 0.75 1.40 Price ($) 1.78 1.89 * 3.82 * 1.15 1.96 1.96 2.37 2.81 2.02 2.42 3.82 * 2.42 3.82 3.82 3.82 EV Kit -- -- -- /-- -- -- -- -- -- -- -- -- -- EV Kit -- -- -- -- -- --/ /-- -- --/ -- -- /-- -- -- www.maxim-ic.com/Thermal-Management 1000-up recommended resale. Prices provided are for design guidance and are FOB USA. International prices will differ due to local duties, taxes, and exchange rates. Not all packages are offered in 1k increments, and some may require minimum order quantities. *Contact factory for pricing details. Part DS1821 DS1822 DS1825 DS18B20 DS18S20 DS28EA00 MAX6575 MAX6576/77 DS1620 DS1624 DS1626 DS1720 DS1722 DS1726 MAX6629-32 MAX6662 DS1629 DS1631 DS1721 DS1731 DS1775 DS620 DS75 DS75LV DS75LX LM75 MAX6604 MAX6625/26 MAX6633/34/35 MAX6652/83 MAX7500-04 MAX31722 MAX31723 Local Digital Temperature Sensors Part MAX6627/28 MAX6682 MAX6581 MAX6602 MAX6638 MAX6642 MAX6646/47/49 MAX6648/92 MAX6654 MAX6655/56 MAX6657/58/59 MAX6680/81 MAX6689 MAX6690 MAX6695/96 MAX6697 MAX6698 MAX6699 Remote Digital Temperature Sensors Description Precision analog temp sensor with temp switch Analog temp sensor in SC70 1.8V analog temp sensors in SC70/SOT23 Temp sensors with voltage reference in SOT23 High-slope analog temp sensor 1.8V to 5.5V analog temp sensor Description Temp switch with factory-programmed threshold and fan on/off driver 2-channel hardware monitor with DAC output 2-channel temp monitors/fan-speed controllers with thermistor inputs Quad linear fan controller with RPM control 2-channel temp monitor with dual PWM fan-speed control Fan-speed regulators and monitors (single/quad) Local/remote temp monitors and PWM fan controllers Remote temp monitor and fan-speed controller Remote-junction, temp-controlled fan-speed regulator 2-channel temp monitor with dual-PWM fan controller and 5 GPIOs Fan-failure detector and power switch for 2-wire fans System management microcontroller 6-channel intelligent fan controller Description Total-elapsed-time recorder with alarm 1-Wire temp/data logger with 8KB data-log memory 2-channel platinum RTD-to-voltage signal conditioner PECI-to-I2C translator K-thermocouple-to-digital converters (0C to +128C and 0C to +1024C) Fan-failure detector and power switch for 2-wire fans Thermocouple-to-digital converter for K, J, N, T, R, E, and S type thermocouples Local Sensor -- -- -- -- -- Operating Temp Range (C) -40 to +85 -40 to +85 -40 to +125 -20 to +120 -20 to +85 -40 to +85 -40 to +125 Tach Inputs -- -- 2 4 2 1/4 1 1 1 -- -- 6 6 Accuracy Range (C) +75 to +125 0 to +95 0 to +125 -40 to +85 +75 to +115 +75 to +115 0 to +125 0 to +85 VCC Supply Range (V) 2.5 to 5.5 2.8 to 3.6 3.0 to 5.5 3.0 to 3.6 3.0 to 5.5 3.0 to 5.5 3.0 to 3.6 Operating Temp Range (C) -40 to +125 -40 to +125 -40 to +125 -40 to +125 -40 to +125 -40 to +85 -40 to +125 -40 to +125 -40 to +125 -40 to +125 -40 to +85 -40 to +85 -40 to +85 IDD (A, max) 200 1000 -- 500 1000 10,000 -- 500 700 1000 3400 2340 3000 IDD (A, max) 300 350 5500 7000 1500 3400 1500 VCC Supply Range (V) 2.7 to 5.5 2.8 to 5.75 3.0 to 5.5 3.0 to 5.5 3.0 to 3.6 3.0 to 5.5 3.0 to 5.5 3.0 to 5.5 3.0 to 5.5 3.0 to 5.5 3.0 to 5.5 2.7 to 5.5 2.7 to 5.5 Package 8-SO 24-SO 10-TDFN 10-MAX 8-SO 8-SO 8-SO Package 8-SO 24-TSSOP 16-QSOP/24-QSOP 28-TQFN 16-TQFN, 16-QSOP 10-MAX 16-QSOP 16-QSOP 16-QSOP 20-TQFN, 20-QSOP 8-SO 40-TQFN 40-TQFN Package 5-SOT23, 7-TO-220 6-SOT23 5-SOT23, 6-SOT23 6-TDFN 5-SOT23 5-SOT23 8-MAX 8-MAX Package 8-MAX 5-SC70 5-SC70, 5-SOT23 6-SOT23 5-SC70 5-SC70 IDD (A, max) 85 1 0 600 40 40 800 800 IDD (A, max) 140 10 15 250 35 13 VCC Supply Range (V) 2.7 to 5.5 2.5 to 5.5 2.5 to 5.5 3.0 to 5.5 2.7 to 5.5 2.7 to 5.5 3.0 to 5.5 3.0 to 5.5 VCC Supply Range (V) 2.7 to 5.5 2.7 to 5.5 1.8 to 3.6 3.0 to 5.5 2.4 to 5.5 1.8 to 5.5 Operating Temp Range (C) -55 to +125 -55 to +125 -55 to +125 -40 to +85 -55 to +125 -55 to +125 -40 to +125 -40 to +125 Operating Temp Range (C) -40 to +125 -55 to +125 -20 to +85 -40 to +125 -55 to +150 -55 to +130 Fan Outputs 1 1 2 4 2 1 1 1 1 2 1 6 6 Accuracy (C) 6 3.5 4.7 5 2.5 2.5 1.5 3 Interface I2C/SMBus 1-Wire Analog I2C/SMBus 3-wire Logic SPI Remote Sensors 0 0 2 0 1 0 1 1 1 2 0 6 10 Local Sensor -- -- Accuracy Range (C) -20 to +100 -20 to +85 -10 to +85 -20 to +85 +60 to +100 -20 to +85 Footprint (mm2) 30 166 9 15 30 30 30 Footprint (mm2) 30 52 30 25 25 15 30 30 30 25 30 36 36 Footprint (mm2) 9 9 9 9 9 9 15 15 Footprint (mm2) 15 4 4/9 9 4 4 Price ($) 1.73 27.25 1.50 * 3.82 1.06 3.10 Price ($) 1.32 2.21 1.95 2.50 1.22 2.10 2.02 3.26 3.46 1.82 1.06 3.45 3.45 Price ($) 0.67 0.79 0.70 0.85 0.75 0.75 3.31 3.31 Price ($) 1.80 0.40 0.59 0.80 0.59 0.35 EV Kit -- -- -- -- EV Kit -- --/ --/ --/ /-- -- -- -- EV Kit -- -- -- -- -- -- -- -- EV Kit -- -- -- -- -- www.maxim-ic.com/Thermal-Management 1000-up recommended resale. Prices provided are for design guidance and are FOB USA. International prices will differ due to local duties, taxes, and exchange rates. Not all packages are offered in 1k increments, and some may require minimum order quantities. *Contact factory for pricing details. Part DS1682 DS2422 MAX6603 MAX6618 MAX6674/75 MAX6684 MAX31855 Other Thermal Products Part MAX6665 DS1780 MAX6615/16 MAX6620 MAX6639 MAX6650/51 MAX6653/63/64 MAX6660 MAX6661 MAX6678 MAX6684 MAX31782 MAX31785 Remote Sensors 0 0 0 1 0 0 1 1 Accuracy (C) 0.5 3.8 5 3.7 4.3 4.4 Interface Analog I2C/SMBus I2C/SMBus I2C/SMBus I2C/SMBus I2C/SMBus I2C/SMBus I2C/SMBus I2C/SMBus I2C/SMBus Logic I2C/SMBus I2C/SMBus Description Temp switches with factory-set thresholds (in 10C increments) Dual-output temp switches with factory-set thresholds (in 5C increments) Resistor-programmable temp switches Remote temp switch with factory-set thresholds (in 10C increments) Temp switches with factory-set thresholds (in 10C increments) Temp switches with analog outputs, factory-set thresholds (in 10C increments) Dual-output remote-junction temp switches Dual-output remote-junction temp switch Fan Controllers Part MAX6501-04 MAX6505-08 MAX6509/10 MAX6513 MAX6514/15 MAX6516-19 MAX6685/86 MAX6687 Temperature Switches Part DS600 MAX6605 MAX6607/08 MAX6610/11 MAX6612 MAX6613 Analog Temperature Sensors