EVALUATION KIT AVAILABLE MAX6639/MAX6639F 2-Channel Temperature Monitor with Dual, Automatic, PWM Fan-Speed Controller General Description Features Two Thermal-Diode Inputs The MAX6639 monitors its own temperature and one external diode-connected transistor or the temperatures Up to 25kHz PWM Output Frequency of two external diode-connected transistors, typically Three Selectable SMBus Addresses available in CPUs, FPGAs, or GPUs. The 2-wire serial Local Temperature Sensor interface accepts standard System Management Bus (SMBus) write byte, read byte, send byte, and receive 1C Remote Temperature Accuracy byte commands to read the temperature data and pro- Two PWM Outputs for Fan Drive (Open Drain Can gram the alarm thresholds. Temperature data can be be Pulled Up to +13.5V) read at any time over the SMBus, and three program- Programmable Fan-Control Characteristics mable alarm outputs can be used to generate inter- Automatic Fan Spin-Up Ensures Fan Start rupts, throttle signals, or overtemperature shutdown signals. Controlled Rate-of-Change Ensures Unobtrusive Fan-Speed Adjustments The temperature data is also used by the internal dual- 3% Fan-Speed Measurement Accuracy PWM fan-speed controller to adjust the speed of up to two cooling fans, thereby minimizing noise when the Temperature Monitoring Begins at POR for Fail- system is running cool, but providing maximum cooling Safe System Protection when power dissipation increases. Speed control is OT and THERM Outputs for Throttling or Shutdown accomplished by tachometer feedback from the fan, so Measures Temperatures Up to +150C that the speed of the fan is controlled, not just the PWM MAX6639F is Optimized for n = 1.021 for Penryn duty cycle. Accuracy of speed measurement is 4%. Compatibility The MAX6639 is available in 16-pin QSOP and 16-pin thin Ordering Information QFN 5mm x 5mm packages. It operates from 3.0V to 3.6V and consumes just 500A of supply current. O PERA T ING M EASU R EMEN T PIN- PART RANGE RANGE PACKAGE Applications -40C to Desktop Computers M A X66 3 9 A E E + 0C to +150C 16 QSOP +125C Notebook Computers -40C to MAX6639ATE+ 0C to +150C 16 TQFN- E P * +125C Projectors -40C to Servers M AX6639F AEE+ 0C to +150C 16 QSOP +125C Networking Equipment -40C to MAX6639FATE+ 0C to +150C 16 TQFN-E P * +125C Typical Application Circuit appears at end of data sheet. +Denotes a lead(Pb)-free/RoHS-compliant package. *EP = Exposed pad. Pin Configurations TOP VIEW 12 11 10 9 PWM1 1 16 SCL DXP1 SCL 13 8 TACH1 2 15 SDA PWM2 3 14 ALERT 14 7 GND SDA MAX6639 TACH2 4 MAX6639 13 ADD PWM1 15 6 V FANFAIL 5 12 DXP2 CC *CONNECT EXPOSED THERM 6 11 DXN PAD TO GND. 5 TACH1 16 OT OT 7 10 GND 12 3 4 V 8 9 DXP1 CC QSOP For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrateds website at www.maximintegrated.com. 19-3682 Rev 3 4/13 PWM2 ALERT TACH2 ADD FANFAIL DXP2 THERM DXNMAX6639/MAX6639F 2-Channel Temperature Monitor with Dual, Automatic, PWM Fan-Speed Controller ABSOLUTE MAXIMUM RATINGS V to GND..............................................................-0.3V to +4V Continuous Power Dissipation (T = +70C) CC A PWM1, PWM2, TACH1, and TACH2 to GND ......-0.3V to +13.5V 16-Pin QSOP (derated 8.3mW/C above +70C) ....... 667mW DXP1 and DXP2 to GND..........................-0.3V to +(V + 0.3V) 16-Pin TQFN 5mm x 5mm CC DXN to GND ..........................................................-0.3V to +0.8V (derated at 33.3mW/C above +70C)................2666.7mW SCL, SDA, THERM, OT, FANFAIL, ADD, Operating Temperature Range .........................-40C to +125C and ALERT to GND ..............................................-0.3V to +6V Junction Temperature......................................................+150C SDA, OT, THERM, ALERT, FANFAIL, Storage Temperature Range ............................-65C to +150C PWM1, and PWM2 Current .............................-1mA to +50mA Lead Temperature (soldering, 10s) .................................+300C DXN Current .......................................................................1mA Soldering Temperature (reflow) .......................................+260C ESD Protection (all pins, Human Body Model) ..................2000V 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 +3.6V, T = 0C to +125C, unless otherwise noted. Typical values are at V = +3.3V, T = +85C.) (Note 1) CC A CC A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Operating Supply Voltage Range V +3.0 +3.6 V CC Standby Current SMB static, sleep mode 3 10 A Operating Current Interface inactive, ADC active 0.5 1 mA V = +3.3V, +60C T +100C and CC A -1.0 +1.0 External Temperature Error +60C T +100C R MAX6639AEE, MAX6639ATE: C V = +3.3V, +40C T +100C and CC A n = 1.008 -2.5 +2.5 0C T +145C R MAX6639FAEE: n = 1.021 V = +3.3V, 0C T +145C -3.8 +3.8 CC R V = +3.3V, +25C T +100C -2.0 +2.0 Internal Temperature Error CC A C MAX6639AEE, MAX6639ATE V = +3.3V, 0C T +125C -4.0 +4.0 CC A V = +3.3V, +25C T +100C -7.7 -2.5 CC A Internal Temperature Error C MAX6639FAEE V = +3.3V, 0C T +125C -10.4 -0.1 CC A Supply Sensitivity of Temperature 0.2 C/V Measurement +0.125 C Temperature Resolution 11 Bits Conversion Time 125 ms Conversion-Rate Timing Error -10 +10 % PWM Frequency Error -10 +10 % Tachometer Accuracy T = +60C to +100C 3 % A High level 70 100 130 Remote-Diode Sourcing Current A Low level 7.0 10 13.0 DXN Source Voltage 0.7 V 2 Maxim Integrated