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TC654 데이터시트(PDF) 18 Page - Microchip Technology |
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TC654 데이터시트(HTML) 18 Page - Microchip Technology |
18 / 36 page TC654/TC655 DS21734A-page 18 2002 Microchip Technology Inc. 6.2 FAN_FAULT1 & FAN_FAULT2 Threshold Registers (FAN_FAULT1 & FAN_ FAULT2) The Fan Fault Threshold Registers (FAN_FAULT1 and FAN_ FAULT2) are used to set the fan fault threshold levels for fan 1 and fan 2, respectively. The Fan Fault Registers are 8-bit, read/writable registers that allow the fan fault RPM threshold to be set in 50 RPM incre- ments. The default setting for both Fan Fault registers is 500 RPM (0000 1010). The maximum set point value is 12750 RPM. If the measured fan RPM (stored in RPM1 and RPM2 Registers) drops below the value that is set in the Fan Fault Registers for more than 2.4sec, a fan fault indication will be given. F1F (bit 0<0>) and F2F (bit 1<0>) in the Status Register indi- cate fan fault conditions for fan 1 and fan 2, respec- tively. The FAULT output will also be pulled low in a fan fault condition. Changing FFCLR (bit 7<0>) in the Con- figuration Register will reset the fan fault bits in the Sta- tus Register as well as the FAULT output. See Register 6-2 for the Fan Fault Threshold Register 8-bit format. REGISTER 6-2: FAN FAULT THRESHOLD REGISTERS (FAN_FAULT1 & FAN_FAULT2) D(7) D(6) D(5) D(4) D(3) D(2) D(1) D(0) RPM 000 000 000 000 000 00 50 000 000 10 100 . ... ... . . ... ... . 111 111 10 12700 111 111 11 12750 |
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