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TC648VPA Fiches technique(PDF) 5 Page - Microchip Technology |
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TC648VPA Fiches technique(HTML) 5 Page - Microchip Technology |
5 / 28 page 2002 Microchip Technology Inc. DS21448C-page 5 TC648 2.0 PIN DESCRIPTIONS The descriptions of the pins are listed in Table 2-1. TABLE 2-1: PIN FUNCTION TABLE 2.1 Analog Input (VIN) The thermistor network (or other temperature sensor) connects to the VIN input. A voltage range of 1.25V to 2.65V (typical) on this pin drives an active duty cycle of 0% to 100% on the VOUT pin (see Section 5.0, “Typical Applications”, for more details). 2.2 Analog Output (CF) CF is the positive terminal for the PWM ramp generator timing capacitor. The recommended CF is 1 µF for 30 Hz PWM operation. 2.3 Analog Input (VAS) An external resistor divider connected to the VAS input sets the auto-shutdown threshold. Auto-shutdown occurs when VIN ≤ VAS. During shutdown, supply current falls to 25 µA (typical). The fan is automatically restarted when VIN ≥ (VAS +VHAS) (see Section 5.0, “Typical Applications” for more details). 2.4 Ground (GND) GND denotes the ground Terminal. 2.5 No Connect No internal connection. 2.6 Digital Output (OTF) OTF goes low to indicate an over-temperature condition. This occurs when the voltage at VIN > VOTF (see Section 1.0, "Electrical Characteristics"). An over- temperature indication is a non-latching condition. 2.7 Digital Output (VOUT) VOUT is an active high complimentary output that drives the base of an external NPN transistor (via an appropri- ate base resistor) or the gate of an N-channel MOS- FET. This output has asymmetrical drive (see Section 1.0, “Electrical Characteristics”). 2.8 Power Supply Input (VDD) VDD may be independent of the fan’s power supply (see Section 1.0, “Electrical Characteristics”). Pin No. Symbol Description 1VIN Analog Input 2CF Analog Output 3VAS Analog Input 4 GND Ground Terminal 5 NC No Internal Connection 6OTF Digital (Open Collector) Output 7VOUT Digital Output 8VDD Power Supply Input |
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