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| 型号： | NCT7491RQR2G |
| 厂商： | ON Semiconductor |
| 文件页数： | 24/80页 |
| 文件大小： | 844K |
| 描述： | IC REMOTE THERMAL MONITOR 24QSOP |
| 标准包装： | 2,500 |
| 系列： | * |
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NCT7491
http://onsemi.com
24
The 4bit Trange values that can be assigned for each
channel are shown in the following table:
Table 23. TRANGE OPTIONS
Trange Bit Field
Trange Value
0000
2癈
0001
2.5癈
0010
3.33癈
0011
4癈
0100
5癈
0101
6.67癈
0110
8癈
0111
10癈
1000
13.33癈
1001
16癈
1010
20癈
1011
26.67癈
1100
32癈
1101
40癈
1110
53.33癈
1111
80癈
Enabling Enhanced Acoustics on the PWM Outputs:
" PWM1 Max Ramp Rate, 0x62 bits <2:0>
" PWM1 enable acoustics, 0x62 bit 3
" PWM2 Max Ramp Rate, 0x63 bits <6:4>
" PWM2 enable acoustics, 0x63 bit 7
" PWM3 Max Ramp Rate, 0x63 bits <2:0>
" PWM3 enable acoustics, 0x63 bit 3
These settings allow the user to limit the rate at which the
PWM output changes whenever the fan control loop
calculates a new value. As this prevents instant changes in
PWM the acoustic response of the system is improved.
These settings apply to both Tmin/Trange mode and to
LookUp Table mode.
Table 24. ENHANCED ACOUSTICS TIMES
Ramp Rate code
Settling time
000
31.75 sec
001
15.7 sec
010
10.5 sec
011
6.33 sec
100
4 sec
101
2.66 sec
110
1.28 sec
111
0.75 sec
Setting the PWM Frequency
Each PWM output can be set to high frequency PWM
mode or low frequency PWM mode. In high frequency
mode the output will run at 22 kHz. In low frequency mode
the frequency can be selected for each PWM output.
Setting bit <3> of register 0x5F to 1 enables high frequency
for PWM1
Setting bit <3> of register 0x60 to 1 enables high frequency
for PWM2
Setting bit <3> of register 0x61 to 1 enables high frequency
for PWM3
If low frequency is enabled (if bit <3> in 0x5F, 0x60 or 0x61
is 0) then the frequency is set as follows:
Table 25. LOW FREQUENCY PWM SELECTION
0x5F, 0x60 or 0x61 bits <2:0>
Frequency
000
11.0 Hz
001
14.7 Hz
010
22.1 Hz
011
29.4 Hz
100
35.3 Hz
101
44.1 Hz
110
58.8 Hz
111
88.2 Hz
LookUp Table Automatic Fan Control
In this mode the selected PWM output is controlled by an
8point lookup table, where a temperature and PWM value
is programmed for each point. Each channel has its own
control table. Any combination of temperature sources can
be assigned to control the PWM output. When more than one
channel is assigned to control a PWM output in this mode the
channel that is the hottest will control the output. The
exception to this is if PECI relative temperatures are
assigned to contol a channel. Since PECI relative values are
always negative they cannot be combined with other
channels, since the other channels would always dominate
due to the fact that they are positive values. To allow PECI
readings to be combined with other readings the user can set
bit 2 of register 0x73 (ABS/REL). This will cause the
absolute PECI readings to be used for fan control, rather than
the relative readings.
" If relative PECI readings are assigned for fan control
then the control temperature values for that PWM
channel must be programmed in negative 2s
complement format (128癈 to 127癈).
" If any temperature source other than
relative PECI is
assigned for fan control (including absolute PECI
readings) then the control temperatures for that PWM
channel must be programmed in unsigned format (0癈
to 255癈).
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