參數(shù)資料
型號： ADT7476AARQZ-R
廠商： ON Semiconductor
文件頁數(shù)： 41/66頁
文件大?。?/td> 945K
描述： IC REMOTE THERMAL CTLR 24QSOP
產(chǎn)品變化通告： MFG CHG Notification ADI to ON Semi
QSOP 24ld Pkg (MSL) Change 17/Jun/2010
標(biāo)準(zhǔn)包裝： 2,500
系列： dBCool®
功能： 風(fēng)扇控制，溫度監(jiān)控器
傳感器類型： 內(nèi)部和外部
感應(yīng)溫度： -40°C ~ 125°C
精確度： ±2.5%
拓撲： ADC，比較器，風(fēng)扇速度計數(shù)器，多路復(fù)用器，寄存器庫
輸出類型： SMBus?
輸出警報： 無
輸出風(fēng)扇： 是
電源電壓： 3 V ~ 3.6 V
工作溫度： -40°C ~ 125°C
安裝類型： 表面貼裝
封裝/外殼： 24-SSOP（0.154"，3.90mm 寬）
供應(yīng)商設(shè)備封裝： 24-QSOP
包裝： 帶卷 (TR)
其它名稱： ADT7476AARQZ-R-ND
ADT7476AARQZ-ROSTR
ADT7476A
http://onsemi.com
41
Figure 62. T
RANGE
 and % Fan Speed Slopes with
PWM
MIN
 = 20%
25C
805C
53.35C
405C
325C
26.65C
205C
165C
13.35C
105C
85C
6.675C
55C
45C
3.335C
2.55C
25C
805C
53.35C
405C
325C
26.65C
205C
165C
13.35C
105C
85C
6.675C
55C
45C
3.335C
2.55C
TEMPERATURE ABOVE T
MIN
0
0
20
40
60
80
100
120
10
20
30
40
50
60
70
80
90
100
TEMPERATURE ABOVE T
MIN
0
0
20
40
60
80
100
120
10
20
30
40
50
60
70
80
90
100
Example: Determining T
RANGE
 for Each Temperature
Channel
The following example shows how the different T
MIN
 and
T
RANGE
 settings can be applied to three different thermal
zones. In this example, the following T
RANGE
 values apply:
T
RANGE
 = 80癈 for ambient temperature
T
RANGE
 = 53.33癈 for CPU temperature
T
RANGE
 = 40癈 for VRM temperature
This example uses the mux configuration described in
Step 2 - Configuring the Mux with the ADT7476A
connected as shown in Figure 52. Both CPU temperature
and VRM temperature drive the CPU fan connected to
PWM1. Ambient temperature drives the front chassis fan
and rear chassis fan connected to PWM2 and PWM3. The
front chassis fan is configured to run at PWM
MIN
= 20%.
The rear chassis fan is configured to run at PWM
MIN
= 30%.
The CPU fan is configured to run at PWM
MIN
= 10%.
Note: The control range for 4-wire fans is much wider than
that of 3-wire fans. In many cases, 4-wire fans can start with
a PWM drive of as little as 20% or less. In extreme cases,
some 3-wire fans cannot run unless a PWM drive of 60% or
more is applied.
Figure 63. T
RANGE
 and % Fan Speed Slopes for VRM,
Ambient, and CPU Temperature Channels
TEMPERATURE ABOVE T
MIN
0
0
10   20   30    40   50   60   70   80   90   100
10
20
30
40
50
60
70
80
90
100
VRM TEMP.
CPU TEMPERATURE
AMBIENT TEMPERATURE
TEMPERATURE ABOVE T
MIN
0
0
10   20   30    40   50   60   70   80   90   100
10
20
30
40
50
60
70
80
90
100
VRM TEMP.
CPU TEMPERATURE
AMBIENT TEMPERATURE
Step 7  T
THERM
 for Temperature Channels
T
THERM
 is the absolute maximum temperature allowed
on a temperature channel. Above this temperature, a
component such as the CPU or VRM can operate beyond its
safe operating limit. When the temperature measured
exceeds T
THERM
, all fans are driven at 100% PWM duty
cycle (full speed) to provide critical system cooling.
The fans remain running at 100% until the temperature
drops below T
THERM
 minus hysteresis, where hysteresis is
the number programmed into the hysteresis registers (0x6D
and 0x6E). The default hysteresis value is 4癈.
The T
THERM
 limit should be considered the maximum
worst-case operating temperature of the system. Because
exceeding any T
THERM
 limit runs all fans at 100%, it has
very negative acoustic effects. Ultimately, this limit should
be set up as a fail-safe, and users should ensure that it is not
exceeded under normal system operating conditions.
Note: T
THERM
 limits are nonmaskable and affect the fan
speed no matter how automatic fan control settings are
configured. This allows some flexibility, because a T
RANGE
value can be selected based on its slope, while a hard limit
(such as 70癈), can be programmed as T
MAX
  (the
temperature at which the fan reaches full speed) by setting
T
THERM
 to that limit (for example, 70癈).
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ADT7476AARQZ-REEL 功能描述:IC REMOTE THERMAL CTRLR 24-QSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 熱管理 系列:dBCool® 標(biāo)準(zhǔn)包裝:1 系列:- 功能:溫度監(jiān)控系統(tǒng)（傳感器） 傳感器類型:內(nèi)部和外部 感應(yīng)溫度:-40°C ~ 125°C，外部傳感器 精確度:±2.5°C 本地（最大值），±5°C 遠程（最大值） 拓撲:ADC，比較器，寄存器庫 輸出類型:2 線 SMBus? 輸出警報:無 輸出風(fēng)扇:無 電源電壓:2.7 V ~ 5.5 V 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-8 供應(yīng)商設(shè)備封裝:SOT-23-8 包裝:Digi-Reel® 其它名稱:296-22675-6
ADT7476AARQZ-REEL7 功能描述:IC REMOTE THERMAL CTRLR 24-QSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 熱管理 系列:dBCool® 標(biāo)準(zhǔn)包裝:1 系列:- 功能:溫度監(jiān)控系統(tǒng)（傳感器） 傳感器類型:內(nèi)部和外部 感應(yīng)溫度:-40°C ~ 125°C，外部傳感器 精確度:±2.5°C 本地（最大值），±5°C 遠程（最大值） 拓撲:ADC，比較器，寄存器庫 輸出類型:2 線 SMBus? 輸出警報:無 輸出風(fēng)扇:無 電源電壓:2.7 V ~ 5.5 V 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-8 供應(yīng)商設(shè)備封裝:SOT-23-8 包裝:Digi-Reel® 其它名稱:296-22675-6
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