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參數資料
| 型號： | ADM1031ARQZ-R7 |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 溫度/濕度傳感器 |
| 英文描述： | DIGITAL TEMP SENSOR-SERIAL, 11BIT(s), 3Cel, RECTANGULAR, SURFACE MOUNT |
| 封裝： | LEAD FREE, QSOP-16 |
| 文件頁數： | 8/30頁 |
| 文件大?。?/td> | 299K |
| 代理商： | ADM1031ARQZ-R7 |
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ADM1031
http://onsemi.com
16
Register 0y24 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
temperature 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 0y25, 0y26 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
Filtered Control Mode
The automatic fan speed control loop reacts
instantaneously to changes in temperature, that is, the PWM
duty cycle responds immediately to temperature change. In
certain circumstances, we do not want the PWM output to
react instantaneously to temperature changes. If significant
variations in temperature are found in a system, the fan
speed changes, which could be obvious to someone in close
proximity. One way to improve the system’s acoustics
would be to slow down the loop so that the fan ramps slowly
to its newly calculated fan speed. This also ensures that
temperature transients are effectively ignored, and the fan’s
operation is smooth.
There are two means by which to apply filtering to the
automatic fan speed control loop. The first method is to ramp
the fan speed at a predetermined rate, to its newly calculated
value instead of jumping directly to the new fan speed. The
second approach involves changing the onchip ADC
sample rate, to change the number of temperature readings
taken per second.
The filtered mode on the ADM1031 is invoked by setting
Bit 0 of the fan filter register (Register 0
×23) for Fan 1 and
Bit 1 for Fan 2. Once the fan filter register has been written
to, and all other control loop parameters (such as TMIN,
TRANGE) have been programmed, the device can be placed
into automatic fan speed control mode by setting Bit 7 of
Configuration Register 1 (Register 0
×00) to 1.
Effect of Ramp Rate on Filtered Mode
Bits <6:5> of the fan filter register determine the ramp rate
in filtered mode. The PWM_OUT signal driving the fan has
a period, T, given by the PWM_OUT drive frequency, f,
since T = 1/f. For a given PWM period, T, the PWM period
is subdivided in to 240 equal time slots. One time slot
corresponds to the smallest possible increment in PWM duty
cycle. A PWM signal of 33% duty cycle is thus high for 1/3
× 240 time slots and low for 2/3 × 240 time slots. Therefore,
33% PWM duty cycle corresponds to a signal that is high for
80 time slots and low for 160 time slots.
Figure 27. 33% PWM Duty Cycle Presented
in Time Slots
PWM_OUT
33% DUTY
CYCLE
80 TIME
SLOTS
160 TIME
SLOTS
PWM OUTPUT
(ONE PERIOD =
240 TIME SLOTS
The ramp rates in filtered mode are selectable between 1,
2, 4, and 8. The ramp rates are actually discrete time slots.
For example, if the ramp rate = 8, then eight time slots are
added to the PWM_OUT high duty cycle each time the
PWM_OUT duty cycle needs to be increased. Figure 28
shows how the filtered mode algorithm operates.
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