參數(shù)資料
型號： ADM1031ARQZ
廠商： ANALOG DEVICES INC
元件分類： 溫度/濕度傳感器
英文描述： DIGITAL TEMP SENSOR-SERIAL, 8BIT(s), 3Cel, RECTANGULAR, SURFACE MOUNT
封裝： LEAD FREE, MO-137AB, QSOP-16
文件頁數(shù)： 10/36頁
文件大?。?/td> 596K
代理商： ADM1031ARQZ
ADM1031
Rev. B | Page 18 of 36
Calculate TMAX.
TMAX = TMIN + ((Max DC – Min DC) × TRANGE/10)
TMAX = 0 + ((100% DC – 33% DC) × 40/10)
TMAX = 0 + ((15 – 5) × 4) = 40
TMAX = 40°C
(as seen on Slope 1 of Figure 27)
In this case, since the minimum duty cycle is the default 33%,
the equation for TMAX reduces to
TMAX = TMIN + ((Max DC – Min DC) × TRANGE/10)
TMAX = TMIN + ((15 – 5) × TRANGE/10)
TMAX = TMIN + (10 × TRANGE/10)
TMAX = TMIN + TRANGE
Relevant Registers for Automatic Fan Speed Control
Mode
Register 0×00 Configuration Register 1
<7> Logic 1 selects automatic fan speed control, Logic 0 selects
software control (Default = 1).
<6:5> 00 = Remote Temp 1 controls Fan 1, Remote Temp 2
controls Fan 2.
01 = Remote Temp 1 controls Fan 1 and Fan 2
10 = Remote Temp 2 controls Fan 1 and Fan 2
11 = Fastest Calculated Speed controls Fan 1 and 2
Register 0×20, 0×21 Fan Characteristics Registers 1, 2
<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
<5:3> 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
<7:6> 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
×22 Fan Speed Configuration Register
<3:0> Min Speed: This nibble contains the speed at which the
fan runs when the temperature is at TMIN. The default is 0×05,
meaning that the fan runs at 33% duty cycle when the
temperature is at TMIN.
<7:4> Min Speed: Determines the minimum PWM cycle for
Fan 2 in automatic fan speed control mode.
Register 0×24 Local Temperature TMIN/TRANGE
<7:3> Local Temperature TMIN. These bits set the temperature
at which the fan turns on when under auto fan speed control.
TMIN can be programmed in 4°C increments.
00000 = 0°C
00001 = 4°C
00010 = 8°C
00011 = 12°C
|
01000 = 32°C (Default)
|
11110 = 120°C
11111 = 124°C
<2:0> Local Temperature TRANGE. This nibble sets the tem-
perature range over which automatic fan speed control takes place.
000 = 5°C
001 = 10°C
010 = 20°C
011 = 40°C
100 = 80°C
Register 0×25, 0×26 Remote 1, 2 Temperature TMIN/TRANGE
<7:3> Remote Temperature TMIN. Sets the temperature at which
the fan switches on based on Remote X Temperature Readings.
00000 = 0°C
00001 = 4°C
00010 = 8°C
00011 = 12°C
|
01100 = 48°C
|
11110 = 120°C
11111 = 124°C
<2:0> Remote Temperature TRANGE. This nibble sets the
temperature range over which the fan is controlled based on
remote temperature readings.
000 = 5°C
001 = 10°C
010 = 20°C
011 = 40°C
100 = 80°C
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