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F75373S Datasheet(PDF) 12 Page - Feature Integration Technology Inc. |
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F75373S Datasheet(HTML) 12 Page - Feature Integration Technology Inc. |
12 / 49 page ![]() Fintek Feature Integration Technology Inc. V0.25P 7 F75373 connected by a serial resistor with 10K Ohm, then connect to VREF (pin13). 5.3.2 Over Temperature Signal (OVT#) The F75373S can provide two external thermal sensors to detect temperature. When monitored temperature exceeds the over-temperature threshold value, OVT# will be asserted until the temperature goes below the hysteresis temperature. THYST To OVT# Figure 5-4 5.4 Fan 5.4.1 Fan speed count Inputs are provided by the signals from fans equipped with tachometer outputs. The level of these signals should be set to TTL level, and maximum input voltage cannot be over VCC. If the input signals from the tachometer outputs are over the VCC, the external trimming circuit should be added to reduce the voltage to obtain the input specification. The normal circuit and trimming circuits are shown as follows: FAN Out +12V GND Pull-up resister 4.7K Ohms +12V Fan Input FANIN 1 F75373S 22K~30K 10K FAN Connector FAN Out +12V GND Pull-up resister < 1K or totem-pole output +12V Fan Input F75373S > 1K Figure 5-6 Fan with Tach Pull-Up to +12V, or Totem-Pole Putput and Zener Clamp 3.3V Zener Figure 5-5 Fan with Tach Pull-Up to +12V, or Totern-Pole Output and Register Attenuator FANIN 1 |
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