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ADM1031
Calculate T MAX
T MAX + T MIN ) ((Max DC * Min DC)
T RANGE 10)
Relevant Registers for Automatic Fan Speed
Control Mode
T MAX + 0 ) ((100% DC * 53% DC)
40 10)
(eq. 3)
Register 0 y 00 Configuration Register 1
T MAX + 0 ) ((15 * 8) 4) + 28
T MAX =28 5 C (As seen on Slope 2 of Figure 26)
Example 2:
T MIN = 0 ? C, T RANGE = 40 ? C
Min DC = 73% = 11 decimal (Table 11)
<7>
<6:5>
Logic 1 selects automatic fan speed control,
Logic 0 selects software control
(Default = 1).
01 = Remote Temp 1 controls Fan 1 and
Fan 2
10 = Remote Temp 2 controls Fan 1 and
Calculate T MAX
T MAX + T MIN ) ((Max DC * Min DC)
T MAX + 0 ) ((100% DC * 73% DC)
T MAX + 0 ) ((15 * 11)
4) + 16
T RANGE 10)
40 10)
(eq. 4)
Fan 2
11 = Fastest Calculated Speed controls
Fan 1 and 2
Register 0 y 20, 0 y 21 Fan Characteristics Registers 1, 2
T MAX =16 5 C (As seen on Slope 3 of Figure 26)
Example 3:
T MIN = 0 ? C, T RANGE = 40 ? C
Min DC = 33% = 5 decimal (Table 11)
Calculate T MAX
T MAX + T MIN ) ((Max DC * Min DC) T RANGE 10)
T MAX + 0 ) ((100% DC * 33% DC) 40 10)
(eq. 5)
<2:0>
Fan X Spin-Up Time.
000 = 200 ms
001 = 400 ms
010 = 600 ms
011 = 800 ms
100 = 1 sec
101 = 2 sec (Default)
110 = 4 sec
111 = 8 sec
T MAX + T MIN ) (10
T RANGE 10)
T MAX + 0 ) ((15 * 5) 4) + 40
T MAX =40 5 C (As seen on Slope 1 of Figure 26)
In this case, since the Minimum Duty Cycle is the default
33%, the equation for T MAX reduces to:
T MAX + T MIN ) ((Max DC * Min DC) T RANGE 10)
T MAX + T MIN ) ((15 * 5) T RANGE 10)
(eq. 6)
T MAX + T MIN ) T RANGE
<5:3>
<7:6>
PWM Frequency Driving the Fan.
000 = 11.7 Hz
001 = 15.6 Hz
010 = 23.4 Hz
011 = 31.25 Hz (Default)
100 = 37.5 Hz
101 = 46.9 Hz
110 = 62.5 Hz
111 = 93.5 Hz
Speed Range N; defines the lowest fan speed
that can be measured by the device.
00 = 1: Lowest Speed = 2647 RPM
01 = 2: Lowest Speed = 1324 RPM
10 = 4: Lowest Speed = 662 RPM
11 = 8: Lowest Speed = 331 RPM
Register 0 y 22 Fan Speed Configuration Register
<3:0>
<7:4>
http://onsemi.com
16
Min Speed: This nibble contains the speed at
which the fan runs when the temperature is at
T MIN . The default is 0 ? 05, meaning that the
fan runs at 33% duty cycle when the
temperature is at T MIN .
Min Speed: Determines the minimum PWM
cycle for Fan 2 in automatic fan speed
control mode.
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