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PC8374L Datasheet(PDF) 160 Page - National Semiconductor (TI) |
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PC8374L Datasheet(HTML) 160 Page - National Semiconductor (TI) |
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160 / 239 page  8.0 Health Management (HM) (Continued) www.national.com 160 Revision1.1 8.5.10 Fan Tachometer Reading 1 MSB Contains the number of 90 KHz clock cycles during a full fan revolution, MSB byte. Location: 29h Type: RO 8.5.11 Fan Tachometer Reading 2 LSB Contains the number of 90 KHz clock cycles during a full fan revolution, LSB byte. Location: 2Ah Type: RO 8.5.12 Fan Tachometer Reading 2 MSB Contains the number of 90 KHz clock cycles during a full fan revolution, MSB byte. Location: 2Bh Type: RO 8.5.13 Fan Tachometer Reading 3 LSB Contains the number of 90 KHz clock cycles during a full fan revolution, LSB byte. Location: 2Ch Type: RO Bit 76543210 Name TACH_HIGH Reset 1 1 1 1 1 1 1 1 Bit Description 7-0 TACH_HIGH. The high byte of 90 KHz clock cycles during a full fan revolution of Fan Tachometer 1. If the fan is not spinning or there is a speed measurement error, the value returned in the MSByte and LSByte, together, is FFFFh. Bit 76543210 Name TACH_LOW Reset 1 1 111111 Bit Description 7-0 TACH_LOW. Same as TACH_LOW of Fan Tachometer Reading 1 LSB register, but for Fan Tachometer 2. Bit 76543210 Name TACH_HIGH Reset 1 1 1 1 1 1 1 1 Bit Description 7-0 TACH_HIGH. Same as TACH_HIGH of Fan Tachometer Reading 1 MSB register, but for Fan Tachometer 2. Bit 76543210 Name TACH_LOW Reset 11111111 Bit Description 7-0 TACH_LOW. Same as TACH_LOW of Fan Tachometer Reading 1 LSB register, but for Fan Tachometer 3. Winbond Electronics Corp. Advanced PC Product Center |
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