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MAX6670AUB75 Datasheet(PDF) 4 Page - Maxim Integrated Products |
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MAX6670AUB75 Datasheet(HTML) 4 Page - Maxim Integrated Products |
4 / 8 page Detailed Description The MAX6668/MAX6670 are simple fan controllers/dri- vers that turn on an internal power transistor when the sensed temperature of an external P-N junction exceeds a factory-set threshold. By connecting a small (up to +12V/250mA nominal) cooling fan to FANOUT, a simple on/off fan-control system is created. Do not con- nect the fan to a power supply of higher than 12V nomi- nal, 15V maximum. FANOUT Driver and FORCEON Controller FANOUT Fan-Driver Output FANOUT is an open-drain output that sinks greater than 250mA of current to turn on the fan, either when the fan trip threshold is exceeded or the fan is forced on by dri- ving FORCEON low. FORCEON Fan-Control Input Drive FORCEON low to turn on the fan when the MAX6670’s remote-sensing junction temperature is less than the fan trip threshold temperature. This overrides the internal control circuitry and allows for an external device to activate the fan. Overtemperature Alarm Outputs WARN Output (MAX6670 Only) WARN is an active-low, open-drain digital output that indicates when the external P-N junction’s temperature exceeds 15°C above the fan trip threshold. The WARN output serves as a warning that the system temperature has continued to rise well above the fan activation tem- perature. OT Output (MAX6670 Only) OT is an active-low, open-drain digital output that indi- cates when the external P-N junction’s temperature exceeds 30°C above the fan trip threshold. OT serves as a thermal shutdown output to the system in case of excessive temperature rise. Hysteresis Input The temperature comparator has hysteresis to prevent small temperature changes near the threshold temper- ature from causing the fan to turn on and off repeatedly over short periods of time. The FANOUT pin goes active and powers the fan when the external P-N junc- tion’s temperature exceeds the factory-programmed Remote Temperature Switches with Integrated Fan Controller/Driver 4 _______________________________________________________________________________________ Pin Description PIN MAX6668 MAX6670 NAME FUNCTION 1 1 PGND Power Ground. PGND is the power ground for the FANOUT power MOSFET switch. 25 FORCEON Fan-Control Input. Drive FORCEON high for normal operation. Drive FORCEON low to force fan on. 3 3 DXP Current Source Positive Input. Connect to the anode of the external diode- connected transistor. Do not leave DXP floating. Connect a 2200pF capacitor between DXP and DXN for noise filtering. 4 4 DXN Current Sink Negative Input. Connect to the cathode of the external diode- connected transistor. DXN is internally biased to a diode voltage drop. 5, 7 7 GND Ground 68 VDD Positive Power Supply 810 FANOUT Fan-Drive Output. FANOUT is an open-drain power MOSFET that sinks up to 250mA current to turn on the fan when the sensed temperature exceeds the fan trip threshold or the fan is forced on by driving FORCEON low. — 2 WARN Temperature Warning Output. WARN is an open-drain output that goes low when the sensed junction temperature is 15 °C higher than the fan trip threshold. — 6 OT Overtemperature Output. OT is an open-drain output that goes low when the sensed junction temperature is 30 °C higher than the fan trip threshold. — 9 HYST Hysteresis Control Input. HYST is a three-level logic input for controlling the fan- drive comparator’s hysteresis. Connect HYST to GND for 4 °C hysteresis, to VDD for 12 °C hysteresis, or leave floating for 8°C hysteresis. |
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Similar Description - MAX6670AUB75 |
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