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參數資料
型號: NCT7491RQR2G
廠商: ON Semiconductor
文件頁數: 62/80頁
文件大小: 844K
描述: IC REMOTE THERMAL MONITOR 24QSOP
標準包裝: 2,500
系列: *
NCT7491
http://onsemi.com
62
Table 91. REGISTER 0x7B  TACH Pulses per Revolution Register (PowerOn Default = 0x55)
Bit
Name
R/W
Description
<1:0>
FAN1
R/W
Sets number of pulses to be counted when measuring Fan 1 speed. Can be used to determine fan
pulses per revolution for unknown fan type.
Pulses Counted
00 = 1
01 = 2 (default)
10 = 3
11 = 4
<3:2>
FAN2
R/W
Sets number of pulses to be counted when measuring Fan 2 speed. Can be used to determine fan
pulses per revolution for unknown fan type.
Pulses Counted
00 = 1
01 = 2 (default)
10 = 3
11 = 4
<5:4>
FAN3
R/W
Sets number of pulses to be counted when measuring Fan 3 speed. Can be used to determine fan
pulses per revolution for unknown fan type.
Pulses Counted
00 = 1
01 = 2 (default)
10 = 3
11 = 4
<7:6>
FAN4
R/W
Sets number of pulses to be counted when measuring Fan 4 speed. Can be used to determine fan
pulses per revolution for unknown fan type.
Pulses Counted
00 = 1
01 = 2 (default)
10 = 3
11 = 4
Table 92. REGISTER 0x7C  Configuration Register 5 (PowerOn Default = 0x05)
Bit
Name
R/W
(Note 38)
Description
<0>
2sC
R/W
2sC = 1 sets the temperature range to the twos complement temperature range.
2sC = 0 changes the temperature range to the offset 64 temperature range. When this bit is
changed, the NCT7491 interprets all relevant temperature register values as defined by this bit.
<1>
TempOffset
R/W
TempOffset = 0 sets offset range to 63C to +64C with 0.5癈 resolution.
TempOffset = 1 sets offset range to 63癈 to +127癈 with 1癈 resolution.
These settings apply to registers 0x70, 0x71, and 0x72 (Remote 1, Internal and Remote2 Tem-
perature offset registers. Note: PECI offset is always 1癈 resolution.)
<3:2>
Pin19
Function
R/W
00 = Pin 19 is SMBALERT
01 = Pin 19 is THERM
10 = Pin 19 is GPIO3
11 = reserved
Note: Pin 19 refers to the QSOP package. The equivalent pin on the QFN package is pin 16.
38.This register becomes readonly when the Configuration Register 1 lock bit is set to 1. Any further attempts to write to this register have
no effect.
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