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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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MEC1322 датащи(PDF) 293 Page - Microchip Technology |
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MEC1322 датащи(HTML) 293 Page - Microchip Technology |
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293 / 456 page  2014 - 2015 Microchip Technology Inc. DS00001719D-page 293 MEC1322 FIGURE 26-2: RPM BASED FAN CONTROL ALGORITHM 26.8.3.1 Programming the RPM Based Fan Control Algorithm The RPM based Fan Control Algorithm powers-up disabled. The following registers control the algorithm. The RPM- PWM Interface fan control registers are pre-loaded with defaults that will work for a wide variety of fans so only the TACH Target Register is required to set a fan speed. The other fan control registers can be used to fine-tune the algorithm behavior based on application requirements. 1. Set the Valid TACH Count Register to the minimum tachometer count that indicates the fan is spinning. 2. Set the Spin Up Configuration Register to the spin up level and Spin Time desired. 3. Set the Fan Step Register to the desired step size. 4. Set the Fan Minimum Drive Register to the minimum drive value that will maintain fan operation. 5. Set the Update Time, and Edges options in the Fan Configuration Register. 6. Set the TACH Target Register to the desired tachometer count. 7. Enable the RPM based Fan Control Algorithm by setting the EN_ALGO bit. Set TACH Target Count Measure Fan Speed Perform Spin Up Routine Maintain Fan Drive Ramp Rate Control Reduce Fan Drive Increase Fan Drive Spin Up Required ? TACH Reading= TACH Target? TACH Reading < TACH Target? Yes No No No Yes Yes |
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