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PC8374L Datasheet(PDF) 159 Page - National Semiconductor (TI) |
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PC8374L Datasheet(HTML) 159 Page - National Semiconductor (TI) |
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159 / 239 page  8.0 Health Management (HM) (Continued) Revision 1.1 159 www.national.com 8.5.7 Temperature Reading Zone2 Reflects current Zone2 temperature. Location: 26h Type: RO 8.5.8 Temperature Reading Zone3 Reflects current Zone3 temperature. Location: 27h Type: RO 8.5.9 Fan Tachometer Reading 1 LSB Contains the number of 90 KHz clock cycles during a full fan revolution, LSB byte. Location: 28h Type: RO Bit 76543210 Name TEMP_DATA Reset 0 0 0 0 0 0 0 0 Bit Description 7-0 TEMP_DATA. Same as TEMP_DATA of Temperature Reading Zone1 register, but for Zone2. Bit 76543210 Name TEMP_DATA Reset 00000000 Bit Description 7-0 TEMP_DATA. Same as TEMP_DATA of Temperature Reading Zone1 register, but for Zone3. Also, if only an LM96011 device is connected to the SensorPath Bus and an optional LM95010 device is not present, this field shows a value of 80h. Bit 76543210 Name TACH_LOW Reset 11111111 Bit Description 7-0 TACH_LOW. The low byte of 90 KHz clock cycles during a full fan revolution of Fan Tachometer 1. If the fan is not spinning, the fan is spinning-up or there is a speed measurement error, the value returned in the MSByte and LSByte, together, is FFFFh. Note that correct results depend on using fans that produce two tachometer pulses per full revolution or one pulse per fan revolution (configured by the TPPR1 bit in the Tachometer Monitoring Control register; see Section 8.5.61 on page 180). Whenever TACH_LOW register is read, the high byte of the tachometer Reading (TACH_HIGH) is latched to save the current fan speed value until TACH_HIGH register is read. Therefore, TACH_LOW must be read first and TACH_HIGH must be read immediately after. Note that internally, only one latch is used for all fan tachometer readings. The two bytes of a tachometer data must be read before reading the next tachometer data; otherwise, the read data may be incorrect. The fan speed data is updated every 1s. Winbond Electronics Corp. Advanced PC Product Center |
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