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TC642COA713 Datasheet(PDF) 4 Page - Microchip Technology |
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TC642COA713 Datasheet(HTML) 4 Page - Microchip Technology |
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4 / 28 page  TC642 DS21444C-page 4 2002 Microchip Technology Inc. 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. 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 (VMIN) An external resistor divider connected to the VMIN input sets the minimum fan speed by fixing the minimum PWM duty cycle (1.25V to 2.65V = 0% to 100%, typi- cal). The TC642 enters shutdown mode when VMIN ≤ VSHDN. During shutdown, the FAULT output is inactive and supply current falls to 25 µA (typical). The TC642 exits shutdown mode when VMIN ≥ VREL (see Section 5.0, “Typical Applications”). 2.4 Ground (GND) GND denotes the ground terminal. 2.5 Analog Input (SENSE) Pulses are detected at the SENSE pin as fan rotation chops the current through a sense resistor. The absence of pulses indicates a fault. 2.6 Digital Output (FAULT) The FAULT line goes low to indicate a fault condition. When FAULT goes low due to a fan fault condition, the device is latched in shutdown mode until deliberately cleared or until power is cycled. FAULT may be con- nected to VMIN if a hard shutdown is desired. FAULT will also be asserted when the PWM reaches 100% duty cycle, indicating that maximum cooling capability has been reached and a possible over-temperature condition may occur. This is a non-latching state and the FAULT output will go high when the PWM duty cycle goes below 100%. 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 3VMIN Analog Input 4 GND Ground Terminal 5 SENSE Analog Input 6FAULT Digital (Open Collector) Output 7VOUT Digital Output 8VDD Power Supply Input |
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