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MAX6639 Scheda tecnica(PDF) 5 Page - Maxim Integrated Products |
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MAX6639 Scheda tecnica(HTML) 5 Page - Maxim Integrated Products |
5 / 22 page 2-Channel Temperature Monitor with Dual, Automatic, PWM Fan-Speed Controller _______________________________________________________________________________________ 5 PIN TQFN QSOP NAME FUNCTION 1, 15 3, 1 PWM2, PWM1 Open-Drain Output to Power-Transistor Driving Fan. Connect to the gate of a MOSFET or base of a bipolar transistor. PWM_ requires a pullup resistor. The pullup resistor can be connected to a supply voltage as high as 13.5V, regardless of the MAX6639’s supply voltage. 2, 16 4, 2 TACH2, TACH1 Tachometer Inputs. Connect to the tachometer output of the fan. TACH_ requires a pullup resistor. The pullup resistor can be connected to a supply voltage as high as 13.5V, regardless of the MAX6639’s supply voltage. 35 FANFAIL Active-Low, Open-Drain, Fan-Failure Output. Open circuit when VCC = 0. 46 THERM Active-Low, Open-Drain Thermal Alarm Output. Typically used for clock throttling. Open circuit when VCC = 0. 57 OT Active-Low, Open-Drain Overtemperature Output. Typically used for system shutdown or clock throttling. Can be pulled up to 5.5V regardless of VCC. Open circuit when VCC = 0. 68 VCC Power-Supply Input. 3.3V nominal. Bypass VCC to GND with a 0.1µF capacitor. 7 10 GND Ground. Connect to a clean ground reference. 8, 10 9, 12 DXP1, DXP2 Combined Current Source and A/D Positive Input for Remote Diode. Connect to anode of remote-diode- connected temperature-sensing transistor. Do not leave floating; connect to DXN if no remote diode is used. Place a 2200pF capacitor between DXP_ and DXN for noise filtering. 9 11 DXN Connect Cathode of the Remote-Diode-Connected Transistor to DXN 11 13 ADD Address Input. Sets device slave address. Connect to GND, VCC, or leave floating to give three unique addresses. See Table 1. 12 14 ALERT Active-Low, Open-Drain SMBus Alert Output 13 16 SCL SMBus Serial-Clock Input. Can be pulled up to 5.5V regardless of VCC. Open circuit when VCC = 0. 14 15 SDA SMBus Serial-Data Input/Output, Open Drain. Can be pulled up to 5.5V regardless of VCC. Open circuit when VCC = 0. Pin Description Typical Operating Characteristics (continued) (VCC = 3.3V, TA = +25°C.) PWMOUT FREQUENCY vs. DIE TEMPERATURE TEMPERATURE ( °C) 85 60 35 10 -15 31 32 33 34 35 30 -40 110 PWMOUT FREQUENCY vs. SUPPLY VOLTAGE SUPPLY VOLTAGE (V) 5.0 4.5 4.0 3.5 31 32 33 34 35 30 3.0 5.5 |
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