LM75 19-4385 Rev 0 3/09 Digital Temperature Sensor and Thermal Watchdog with 2-Wire Interface General Description Features SO (SOP) and MAX (SOP) Packages The LM75 temperature sensor includes a delta-sigma analog-to-digital converter, and a digital overtempera- 2 I C Bus Interface ture detector. The host can query the LM75 through its Separate Open-Drain OS Output Operates as 2 I C interface to read temperature at any time. The Interrupt or Comparator/Thermostat Input open-drain overtemperature output (OS) sinks current Register Readback Capability when the programmable temperature limit is exceeded. The OS output operates in either of two modes, com- Power-Up Defaults Permit Stand-Alone Operation parator or interrupt. The host controls the temperature as a Thermostat at which the alarm is asserted (T ) and the hysteresis OS 3.0V to 5.5V Supply Voltage temperature below which the alarm condition is not Low Operating Supply Current 250A (typ), 1mA valid (T ). Also, the LM75s T and T regis- HYST OS HYST (max) ters can be read by the host. The address of the LM75 4A (typ) Shutdown Mode Minimizes Power is set with three pins to allow multiple devices to work Consumption on the same bus. Power-up is in comparator mode, with Up to Eight LM75s Can Be Connected to a Single defaults of T = +80C and T = +75C. The 3.0V OS HYST Bus to 5.5V supply voltage range, low supply current, and 2 I C interface make the LM75 ideal for many applica- Pin- and/or Register-Compatible with Improved- tions in thermal management and protection. Performance Maxim Sensors Including MAX7500, MAX6625, MAX6626, DS75LV, and DS7505 Applications Thermal System Management Functional Diagram Thermal Protection +V = 3.0V to 5.5V S Test Equipment 8 3 Computers and Office Electronics OS 16 SILICON SET POINT BANDGAP 9-BIT DELTA- COMPARATOR W/ TEMPERATURE SIGMA ADC 16 HYSTERESIS SENSOR MAX is a registered trademark of Maxim Integrated Products, Inc. TOS SET POINT REGISTER Pin Configuration TOP VIEW POINTER CONFIGURATION T SET HYST REGISTER REGISTER POINT REGISTER + SDA 1 8 +V S 8816 16 16 SCL 2 7 A0 LM75 7 1 A0 OS 3 6 A1 SDA 6 A1 2-WIRE INTERFACE 5 SCL A2 GND 4 5 A2 2 4 MAX (SOP), SO Ordering Information/Selector Guide PART PIN-PACKAGE PKG SUPPLY VOLTAGE (V) TOP MARK LM75BIM-3+ 8 SO (SOP) Bulk 3.3 LM75BIM-3 LM75BIMX-3+ 8 SO (SOP) T&R 3.3 LM75BIM-3 LM75BIMM-3+ 8 MAX (SOP) Bulk 3.3 T01B LM75BIMMX-3+ 8 MAX (SOP) T&R 3.3 T01B LM75BIM-5+ 8 SO (SOP) Bulk 5.0 LM75BIM-5 LM75BIMX-5+ 8 SO (SOP) T&R 5.0 LM75BIM-5 LM75BIMM-5+ 8 MAX (SOP) Bulk 5.0 T00B LM75BIMMX-5+ 8 MAX (SOP) T&R 5.0 T00B 2 Note: Devices are specified over the -55C to +125C temperature range and include I C noise filter. +Denotes a lead(Pb)-free/RoHS-compliant package. T&R = Tape and reel. Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com.Digital Temperature Sensor and Thermal Watchdog with 2-Wire Interface ABSOLUTE MAXIMUM RATINGS (Note 1) +V to GND ...........................................................-0.3V to +6.0V Junction-to-Ambient Thermal Resistance ( ) (Note 3) S JA OS, SDA, SCL to GND...........................................-0.3V to +6.0V 8-Pin MAX (SOP).....................................................221C/W All Other Pins to GND.................................-0.3V to (+V + 0.3V) 8-Pin SO (SOP)............................................................170C/W S Input Current at Any Pin (Note 2)..........................................5mA ESD Protection Package Input Current (Note 2)..........................................20mA Human Body Model (R = 1.5k, C = 100pF) D S OS Output Sink Current ......................................................10mA All Pins to GND .................................................................2kV Continuous Power Dissipation (T = +70C) (Note 3) Operating Temperature Range .........................-55C to +125C A 8-Pin MAX (SOP) Junction Temperature......................................................+150C (derate 4.5mW/C above +70C)..................................362mW Storage Temperature Range .............................-65C to +150C 8-Pin SO (SOP) (derate 5.9mW/C above +70C) ........471mW Lead Temperature (soldering, 10s) .................................+300C Junction-to-Case Thermal Resistance ( ) (Note 3) JC 8-Pin MAX (SOP).......................................................42C/W 8-Pin SO (SOP)..............................................................40C/W Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. DC and AC electrical specifica- tions do not apply when operating the device beyond its rated operating conditions. Note 2: When the input voltage (V ) at any pin exceeds the Absolute Maximum Ratings limits (V < GND, V > 6V or V > +V ), the I I I I S current at that pin should be limited to 5mA. The 20mA maximum package input current rating limits the number of pins that can safely exceed the power supplies with an input current of 5mA to four. Note 3: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a single- layer board. For detailed information on package thermal considerations, refer to www.maxim-ic.com/thermal-tutorial. Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional operation 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. ELECTRICAL CHARACTERISTICS (+V = +3.0V to +5.5V, unless otherwise noted. Temperature accuracy specifications apply for +V = 3.3V for versions with -3 in S S the suffix and for +V = 5V for versions with -5 in the suffix. T = -55C to +125C, unless otherwise noted. Typical values are at S A +V = +5V, T = +25C.) (Notes 4, 5) S A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS -25C T +100C -2.0 +2.0 A Accuracy (Six-Sigma) C -55C T +125C -3.0 +3.0 A -25C T +100C -1.5 +1.5 A Accuracy (Three-Sigma) (Note 6) C -55C T +125C -2.0 +2.0 A Resolution 9 Bits Temperature Conversion Time (Note 7) 100 300 ms 2 I C inactive 0.25 0.5 mA Quiescent Supply Current Shutdown mode, +V = 3V 4 S A Shutdown mode, +V = 5V 6 S +V Supply Voltage Range 3.0 5.5 V S OS Output Saturation Voltage I = 4.0mA (Note 8) 0.8 V OUT Conver- OS Delay (Note 9) 1 6 sions OS Output Fall Time t C = 400pF, I = 3mA (Note 10) 250 ns OF L O T Default Temperature (Note 11) 80 C OS T Default Temperature (Note 11) 75 C HYST 2 LM75