參數(shù)資料
型號(hào)： LM93CIMT
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類： 電源管理
英文描述： Hardware Monitor with Integrated Fan Control for Server Management
中文描述： 16-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO56
封裝： MO-153EE, TSSOP-56
文件頁數(shù)： 56/92頁
文件大?。?/td> 654K
代理商： LM93CIMT
16.0 Registers
(Continued)
16.6.11 Register 6E–75h
Fan Tachometer Readings
Register
Address
Read/
Write
Register
Name
Fan Tach
1
LSB
Fan Tach
1
MSB
Fan Tach
2
LSB
Fan Tach
2
MSB
Fan Tach
3
LSB
Fan Tach
3
MSB
Fan Tach
4
LSB
Fan Tach
4
MSB
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Default
Value
6Eh
R
TACH[5:0]
RES
N/D
6Fh
R
TACH[13:6]
N/D
70h
R
TACH2[5:0]
RES
N/D
71h
R
TACH2[13:6]
N/D
72h
R
TACH3[5:0]
RES
N/D
73h
R
TACH3[13:6]
N/D
74h
R
TACH4[5:0]
RES
N/D
75h
R
TACH4[13:6]
N/D
The 14-bit fan tach readings indicate the number of 22.5 kHz clock periods that occurred during two full periods of the tachometer
input signal. Most fans produce two tachometer pulses per full revolution. These registers must be updated at least once every
second.
The fan tachometer reading registers must always return an accurate fan tachometer measurement, even when a fan is disabled
or non-functional. 3FFFh indicates that the fan is stalled, not spinning fast enough to measure, or the tachometer input is not
connected to a valid signal.
If the pulses per revolution of the fan is known, the RPM can be calculated with the following equation:
RPM= 22500 cycles/sec * 60 sec/min * 2 pulses / COUNT cycles / PULSES_PER_REV
where:
PULSES_PER_REV = the number of pulses that the fan produces per revolution
COUNT
= The 14-bit value read from the tach register
L
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