EVALUATION KIT AVAILABLE MAX6633/MAX6634/ 12-Bit Plus Sign Temperature Sensors 2 MAX6635 with SMBus/I C-Compatible Serial Interface General Description Features The MAX6633/MAX6634/MAX6635 combine a tempera- +3V to +5.5V Supply Range ture sensor, a programmable overtemperature alarm, Accuracy 2 and an SMBus/I C-compatible serial interface into 1C max (0C to +50C) a single package. They convert their die temperatures 1.5C max (-20C to +85C) into digital values using internal analog-to-digital con- 2.5C max (-40C to +125C) verters (ADCs). The result of the conversion is then held 2.5C typ (+150C) in a temperature register as a 12-bit + sign value, allow- User-Programmable Temperature Thresholds ing 0.0625C resolution, readable at any time through (MAX6634/MAX6635) the serial interface. The devices are capable of reading User-Configurable Alarm Output(s) (MAX6634/ temperatures up to +150C. MAX6635) The MAX6633/MAX6634/MAX6635 feature a shutdown 2 Ability to Respond to SMBus/I C-Compatible Alert mode that saves power by turning off everything except Response Address (MAX6634/MAX6635) the power-on reset (POR) and the serial interface. OVERT Output for System Shutdown (MAX6635) The devices can be configured to separate addresses, Multiple Devices per Bus allowing multiple devices to be used on the same bus. 16 devices (MAX6633) The MAX6633 has four address pins, allowing up to 16 8 devices (MAX6634) devices to be connected to a single bus. The MAX6634 4 devices (MAX6635) has three address pins, allowing up to eight devices to be connected to a single bus. The MAX6635 has two Ordering Information address pins, allowing up to four devices to be con- PART TEMP. RANGE PIN-PACKAGE nected to a single bus. MAX6633MSA -55C to +150C 8 SO The MAX6633/MAX6634/MAX6635 make temperature MAX6634MSA -55C to +150C 8 SO data available for transfer over the serial interface. MAX6635MSA -55C to +150C 8 SO The MAX6634 incorporates a dual-mode ALERT output (open drain) and can serve as an upgraded alternative to the LM75. The MAX6635 includes an ALERT output Typical Operating Circuit and an OVERT output (both open drain) and can func- V CC tion as an upgraded replacement for the LM76 in most 0.1F +3.0V TO +5.5V applications. The MAX6634/MAX6635 feature user-pro- grammable temperature thresholds. All three devices 8 come in an 8-pin SO package. V CC 10k 1k 1k 10k Applications 5 ALERT TO INTERRUPT Battery Temperature Alarms CONTROLLER MAX6635 PC Temperature Control 1 SDA 2 TO SMBus/I C 2 MASTER SCL 3 OVERT TO SYSTEM Pin Configurations appear at end of data sheet. SHUTDOWN A0 A1 GND 7 6 4 19-2120 Rev 1 4/14MAX6633/MAX6634/ 12-Bit Plus Sign Temperature Sensors 2 MAX6635 with SMBus/I C-Compatible Serial Interface Absolute Maximum Ratings V , SDA, SCL ....................................................-0.3V to +6.0V Junction Temperature ......................................................+150C CC All Other Pins ..............................................-0.3V to V +0.3V Operating Temperature Range ......................... -55C to +150C CC SDA, ALERT, OVERT Current ........................... -1mA to +50mA Storage Temperature Range ............................ -65C to +150C ESD Protection (Human Body Model)...............................2000V Lead Temperature (soldering, 10s) ................................+300C Continuous Power Dissipation (T = +70C) A 8-Pin SO (derate 5.88mW/C above +70C) ..............471mW 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, T = -55C to +125C, unless otherwise noted. Typical values are V = +3.3V, T = +25C, unless other- CC A CC A wise noted.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS TEMPERATURE-TO-DIGITAL CONVERTER CHARACTERISTICS Supply Range V 3.0 5.5 V CC 0 C T = +50C, V = +3.3V -1.0 0.4 +1.0 A CC -20 C T = +85C, V = +3.3V -1.5 0.6 +1.5 A CC Accuracy (Note 1) -40 C T = 125C, V = +3.3V -2.5 1.0 +2.5 C A CC T = -55 C, V = +3.3V -2.8 1.5 +2.8 A CC T = +150 C, V = +3.3V 2.5 A CC Power-Supply Rejection Ratio PSRR 0.2 0.5 C/V POR Threshold Hysteresis 90 mV V = +3.0V , SMBus inactive 12 20 CC Supply Current in Shutdown A V = +5.5V, SMBus inactive 20 30 CC V = +3.0V, SMBus inactive 150 CC Average Operating Current A V = +5.5V, SMBus inactive 200 CC V = +3.0V, SMBus inactive 270 350 CC Peak Operating Current (Note 2) A V = +5.5V, SMBus inactive 350 700 CC Conversion Rate 1.4 2 2.4 Hz DIGITAL INTERFACE Logic Input Low Voltage V V = +3.0V to +5.5V 0.65 V IL CC V = +3V 2.2 Logic Input High CC V V IH Voltage V = +5.5V 2.4 CC Input Leakage Current I V = GND or V 1 A I LEAK IN CC V = 0.6V (SMBDATA, OL Output Low Sink Current I 6 mA OL ALERT, OVERT) Output Leakage Current I ALERT, OVERT at V 1 A O LEAK CC Input Capacitance C 5 pF IN Maxim Integrated 2 www.maximintegrated.com