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參數(shù)資料
| 型號(hào)： | ADT7462ACPZ-500RL7 |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 溫度/濕度傳感器 |
| 英文描述： | DIGITAL TEMP SENSOR-SERIAL, 8BIT(s), 4Cel, SQUARE, SURFACE MOUNT |
| 封裝： | 5 X 5 MM, LFCSP-32 |
| 文件頁數(shù)： | 40/88頁 |
| 文件大小： | 836K |
| 代理商： | ADT7462ACPZ-500RL7 |
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ADT7462
Rev. 2 | Page 45 of 88 | www.onsemi.com
TMIN
P
W
M
D
U
T
Y
C
Y
C
L
E
0%
100%
TTHERM
TRANGE
HYSTERESIS
0556
9-
05
2
Figure 64. How TTHERM Relates to Automatic Fan Control
STEP 7—THYST FOR TEMPERATURE CHANNELS
THYST is the amount of extra cooling a fan provides after the
temperature measured has dropped back below TMIN before the
fan turns off. The premise for temperature hysteresis (THYST) is
that without it, the fan would merely chatter or cycle on and
off regularly whenever the temperature hovers near the TMIN
setting.
The THYST value chosen determines the amount of time needed
for the system to cool down or heat up as the fan is turning on
and off. Values of hysteresis are programmable in the range of
1°C to 15°C. Larger values of THYST prevent the fans from
chattering on and off. The THYST default value is set at 4°C.
Hysteresis Register
Register 0x60, Bits [3:0] Local HYS
Register 0x61, Bits [3:0] Remote 1 HYS
Register 0x62, Bits [3:0] Remote 2 HYS
Register 0x63, Bits [3:0] Remote 3 HYS
In some applications, it is required that fans not turn off below
TMIN but remain running at PWMMIN. Bits [1:0] of the PWM1,
PWM2 Frequency Register (0x25) and the PWM3, PWM4
Frequency Register (0x26) allow the fans to be turned off or to
be kept spinning below TMIN. If the fans are always on, the THYST
value has no effect on the fan when the temperature drops
below TMIN.
TMIN
P
W
M
D
U
T
Y
C
Y
C
L
E
0%
100%
TRANGE
TTHERM
THYST
05
569-
053
Figure 65. THYST Value Applies to Fan On/Off Hysteresis
Dynamic TMIN Control Mode
In addition to the automatic fan speed control mode described
in the Automatic Fan Control Overview section, the ADT7462
has a mode that extends the basic automatic fan speed control
loop. Dynamic TMIN control allows the ADT7462 to intelligently
adapt the system’s cooling solution for best system performance
or lowest possible system acoustics, depending on user or design
requirements. Use of dynamic TMIN control alleviates the need
to design for worst-case conditions and significantly reduces
system design and validation time.
Designing for Worst-Case Conditions
System design must always allow for worst-case conditions.
In PC design, the worst-case conditions include, but are not
limited to, the following:
Worst-Case Altitude
A computer can be operated at different altitudes. Altitude
affects the relative air density, which alters the effectiveness
of the fan cooling solution. For example, when comparing
40°C air temperature at 10,000 feet to 20°C air temperature
at sea level, relative air density is increased by 40%. This
means that the fan can spin 40% slower and make less
noise at sea level than at 10,000 feet while keeping the
system at the same temperature at both locations.
Worst-Case Fan
Due to manufacturing tolerances, fan speeds in rpm are
normally quoted with a tolerance of ±20%. The designer
must assume that the fan rpm can be 20% below tolerance.
This translates to reduced system airflow and elevated system
temperature. Note that fans 20% out of tolerance can
negatively impact system acoustics because they run faster
and generate more noise.
Worst-Case Chassis Airflow
The same motherboard can be used in a number of
different chassis configurations. The design of the chassis
and the physical location of fans and components determine
the system’s thermal characteristics. Moreover, for a given
chassis, the addition of add-in cards, cables, or other system
configuration options can alter the system airflow and
reduce the effectiveness of the system cooling solution.
The cooling solution can also be inadvertently altered by
the end user. (For example, placing a computer against a
wall can block the air ducts and reduce system airflow.)
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相關(guān)代理商/技術(shù)參數(shù) |
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| ADT7462ACPZ-5RL7 | 功能描述:監(jiān)控電路 FLX H/WRE MON IC SRV RoHS:否 制造商:STMicroelectronics 監(jiān)測(cè)電壓數(shù): 監(jiān)測(cè)電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開關(guān):No Backup 上電復(fù)位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| ADT7462ACPZ-R7 | 功能描述:監(jiān)控電路 FLX H/WRE MON IC SRV RoHS:否 制造商:STMicroelectronics 監(jiān)測(cè)電壓數(shù): 監(jiān)測(cè)電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開關(guān):No Backup 上電復(fù)位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| ADT7462ACPZ-REEL | 功能描述:監(jiān)控電路 FLX H/WRE MON IC SRV RoHS:否 制造商:STMicroelectronics 監(jiān)測(cè)電壓數(shù): 監(jiān)測(cè)電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開關(guān):No Backup 上電復(fù)位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
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| ADT7462EBZEVB | 功能描述:EVALUATION BOARD ADT7462 制造商:on semiconductor 系列:* 零件狀態(tài):在售 標(biāo)準(zhǔn)包裝:1 |
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