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TC665 Datasheet(PDF) 9 Page - Microchip Technology |
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TC665 Datasheet(HTML) 9 Page - Microchip Technology |
9 / 36 page 2002 Microchip Technology Inc. DS21737A-page 9 TC664/TC665 4.0 DEVICE OPERATION The TC664/TC665 devices allow you to control, moni- tor and communicate (via SMBus) fan speed for 2-wire and 3-wire DC brushless fans. By pulse width modulat- ing (PWM) the voltage across the fan, the TC664/ TC665 controls fan speed according to the system tem- perature.The goal of temperature proportional fan speed control is to reduce fan power consumption, increase fan life and reduce system acoustic noise. With the TC664/TC665 devices, fan speed can be con- trolled by the analog input VIN or the SMBus interface, allowing for high system flexibility. The TC664/TC665 devices also measure and monitor fan revolutions per minute (RPM). A fan’s speed (RPM) is a measure of its health. As a fan’s bearings wear out, the fan slows down and eventually stops (locked rotor). By monitoring the fan’s RPM level, the TC664/TC665 devices can detect open, shorted, unconnected and locked rotor fan conditions. The fan speed threshold can be set to provide a predictive fan failure feature. This feature can be used to give a system warning and, in many cases, help to avoid a system thermal shut- down condition. The fan RPM data and threshold reg- isters are available over the SMBus interface which allows for complete system control. The TC664/TC665 devices are identical in every aspect except for how they indicate an over-tempera- ture condition. When VIN voltage exceeds 2.6 V (typi- cal), both devices will set OTF (bit 5<X>) in the Status Register to a '1'. The TC665 will additionally pull the FAULT output low during an over-temperature condition. FIGURE 4-1: Typical Application Circuit. 1 2 3 4 5 6 7 8 9 10 +5 V FAN RISO RSENSE CSENSE NTC Thermistor R1 R2 C1 0.01 µF C2 1µF 100 k Ω @ 25°C PICmicro® Microcontroller +12 V +5 V +5 V +5 V 34.8 k Ω 14.7 k Ω CF 1.0 µF RSCLK 20 k Ω RSDA 20 k Ω 715 Ω 0.1 µF RFAULT 20 k Ω Note: Refer to Table 7-1 for RSENSE value. VIN CF SCLK SDA GND FAULT NC SENSE VOUT VDD TC664 TC665 |
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