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TC642B Datasheet(PDF) 10 Page - Microchip Technology |
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TC642B Datasheet(HTML) 10 Page - Microchip Technology |
10 / 36 page TC642B/TC647B DS21756C-page 10 2002-2013 Microchip Technology Inc. 3.0 PIN FUNCTIONS The description of the pins are given in Table 3-1. TABLE 3-1: PIN FUNCTION TABLE 3.1 Analog Input (VIN) The thermistor network (or other temperature sensor) connects to VIN. A voltage range of 1.20V to 2.60V (typ- ical) on this pin drives an active duty cycle of 0% to 100% on the VOUT pin. 3.2 Analog Output (CF) CF is the positive terminal for the PWM ramp generator timing capacitor. The recommended value for the CF capacitor is 1.0 µF for 30 Hz PWM operation. 3.3 Analog Input (VMIN) An external resistor divider connected to VMIN sets the minimum fan speed by fixing the minimum PWM duty cycle (1.20V to 2.60V = 0% to 100%, typical). The TC642B and TC647B devices enter shutdown mode when 0 V MIN VSHDN. During shutdown, the FAULT output is inactive and supply current falls to 30 µA (typical). 3.4 Analog Input (SENSE) Pulses are detected at SENSE as fan rotation chops the current through a sense resistor. The absence of pulses indicates a fan fault condition. 3.5 Digital (Open-Drain) Output (FAULT) The FAULT line goes low to indicate a fault condition. When FAULT goes low due to a fan fault, the output will remain low until the fan fault condition has been removed (16 pulses have been detected at the SENSE pin in a 32/f period). For the TC642B device, the FAULT output will also be asserted when the VIN voltage reaches the VOTF treshold of 2.62V (typical). This gives an over-temperature/100% fan speed indication. 3.6 Digital Output (VOUT) VOUT is an active-high complimentary output and drives the base of an external NPN transistor (via an appropriate base resistor) or the gate of an N-channel MOSFET. This output has asymmetrical drive. During a fan fault condition, the VOUT output is continuously on. 3.7 Power Supply Input (VDD) The VDD pin with respect to GND provides power to the device. This bias supply voltage may be independent of the fan power supply. Pin Name Function 1VIN Analog Input 2CF Analog Output 3VMIN Analog Input 4 GND Ground 5 SENSE Analog Input 6FAULT Digital (Open-Drain) Output 7VOUT Digital Output 8VDD Power Supply Input |
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Descripción similar - TC642B_13 |
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