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W83781D Datasheet(PDF) 16 Page - Winbond |
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W83781D Datasheet(HTML) 16 Page - Winbond |
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16 / 54 page  W83781D/W83781G Publication Release Date: April 14, 2005 - 12 - Revision 2.0 VV R RR IN s =× + 2 12 The value of R1 and R2 can be selected to 28K Ohms and 10K Ohms, respectively, when the input voltage is 12V. The Pin 33 is connected to +5V power supply to provide analog power, and this voltage is connected to internal resistors to monitor the +5V voltage. The negative voltage should be connected an op amps to invert and reduce the -5V and -12V voltage. The input voltage can be calculated by following equation. VV R R SIN F IN =− × () The Winbond recommended value is RIN=90.9K Ohms and RF=60.4K Ohms for -5V voltage input, RIN=210K Ohms and RF=60.4K Ohms for -12V voltage input. The temperature sensors are connected by a 10K Ohms, then connect to VREF (Pin 37). The sensors should choose 10K Ohms at 25°C and β-value is 3435 for default R-T table. If the β-value is not 3435, the R-T table should be re-program to generate a correct temperature. 7.3 FAN Inputs and FAN Control Inputs are provides for signals from fans equipped with tachometer outputs. The level of these signals should be set to TTL level, and maximum input voltage can not be over +5.5V. 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 following. Determine the fan counter according to: Count RPM Divisor = × × 135 106 . The default divisor is 2 and defined at CR47.bit7~4 and CR4B.bit7~6. The followed table is an example for the relation of divisor, PRM, and count. DIVISOR NOMINAL PRM TIME PER REVOLUTION COUNTS 70% RPM TIME FOR 70% 1 8800 6.82 ms 153 6160 9.74 ms 2 4400 13.64 ms 153 3080 19.48 ms 4 2200 27.27 ms 153 1540 38.96 ms 8 1100 54.54 ms 153 770 77.92 ms |
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