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TC665 Datasheet(PDF) 8 Page - Microchip Technology |
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TC665 Datasheet(HTML) 8 Page - Microchip Technology |
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8 / 36 page  TC664/TC665 DS21737B-page 8 2002-2013 Microchip Technology Inc. 3.0 PIN FUNCTIONS The descriptions of the pins are listed in Table 3-1. TABLE 3-1: PIN FUNCTION TABLE 3.1 Analog Input (VIN) A voltage range of 1.62 V to 2.6 V (typical) on this pin drives an active duty-cycle of 30% to 100% on the VOUT pin. 3.2 Analog Output (CF) Positive terminal for the PWM ramp generator timing capacitor. The recommended CF is 1 µF for 30 Hz PWM operation. 3.3 SMBus Serial Clock Input (SCLK) Clocks data into and out of the TC664/TC665. See Section 5.0 for more information on the serial interface. 3.4 Serial Data (Bi-directional) (SDA) Serial data is transferred on the SMBus in both direc- tions using this pin. See Section 5.0 for more informa- tion on the serial interface. 3.5 Digital (Open Drain) Output (FAULT) When the fan’s RPM falls below the user-set RPM threshold (or OTF occurs with TC665), a logic low signal is asserted. 3.6 Analog Input (SENSE) Fan current pulses are detected at this pin. These pulses are counted and used in the calculation of the fan RPM. 3.7 Digital Output (VOUT) This active high complimentary output drives the base of an external transistor or the gate of a MOSFET. 3.8 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. Name Function VIN Analog Input CF Analog Output SCLK Serial Clock Input SDA Serial Data In/Out (Open Drain) GND Ground FAULT Digital (Open Drain) Output NC No Connection SENSE Analog Input VOUT Digital Output VDD Power Supply Input |
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