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PC8374L Datasheet(PDF) 173 Page - National Semiconductor (TI) |
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PC8374L Datasheet(HTML) 173 Page - National Semiconductor (TI) |
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173 / 239 page  8.0 Health Management (HM) (Continued) Revision 1.1 173 www.national.com 8.5.43 Fan Tachometer1 Low Limit LSB LSB of lowest permitted fan speed value. Location: 54h Type: R/W or RO (Becomes read-only when LOCK_LIM bit in the Monitoring Control register is set.) 8.5.44 Fan Tachometer1 Low Limit MSB LSB of lowest permitted fan speed value. Location: 55h Type: R/W or RO (Becomes read-only when LOCK_LIM bit in the Monitoring Control register is set.) 8.5.45 Fan Tachometer2 Low Limit LSB LSB of lowest permitted fan speed value. Location: 56h Type: R/W or RO (Becomes read-only when LOCK_LIM bit in the Monitoring Control register is set.) Bit 76543210 Name FAN_MIN_LSB Reset 11111111 Bit Description 7-0 FAN_MIN_LSB. Contains the low byte of the Fan Tachometer value, which indicates the lowest permitted fan speed value setting. If the number of clock cycles counted in one fan revolution is higher than the Fan Tachometer value (FAN_MIN_LSB and FAN_MIN_MSB), the associated FANn_xxx bits in the HM Interrupt Status register, HM Sensor Status Register and Status Register are set to 1 (see Section 8.4.5 on page 144, Section 8.4.9 on page 148, and Section 8.5.24 on page 165). These status bits are never set to 1 if the Fan Tachometer Low Limit value is FFFFh. If the associated FANPWM output is set to Automatic fan control and if the SPIN_END bit in related Extended FANPWM Control register is set to 0, the Fan Tachometer Low Limit registers (FAN_MIN_LSB and FAN_MIN_MSB) indicate the fan speed at which the spin-up is ended (see Section 8.5.85 on page 190). In this case, a fan speed below the set value does not set the FANn_xxx bits to 1; a fan speed above the set value indicates the end of spin-up process (see “Speed Change Modes” on page 136). The two LSBits of this field are irrelevant and can be set to any value. For correct operation when writing a new value to the Low Limit registers, the Limit LSB register must be written before the Limit MSB register. Note that internally, only one latch is used for all Limit writing. The two bytes of a tachometer limit must be written before writing the next tachometer limit; otherwise, the written data may be incorrect. Bit 76543210 Name FAN_MIN_MSB Reset 11111111 Bit Description 7-0 FAN_MIN_MSB. Contains the high byte of the Fan Tachometer value which indicates either the lowest permitted fan speed value setting or the fan speed at which the spin-up is ended. Bit 76543210 Name FAN_MIN_LSB Reset 11111111 Bit Description 7-0 FAN_MIN_LSB. Same as FAN_MIN_LSB of Fan Tachometer1 Low Limit LSB register, but for Fan Tachometer 2. Winbond Electronics Corp. Advanced PC Product Center |
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