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參數資料
| 型號： | ADT7466ARQZ-REEL7 |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 模擬信號調理 |
| 英文描述： | dBCool Remote Thermal Controller and Voltage Monitor |
| 中文描述： | SPECIALTY ANALOG CIRCUIT, PDSO16 |
| 封裝： | LEAD FREE, MO-137AB, QSOP-16 |
| 文件頁數： | 29/48頁 |
| 文件大小： | 1269K |
| 代理商： | ADT7466ARQZ-REEL7 |
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ADT7466
AUTOMATIC FAN SPEED CONTROL
The ADT7466 has a local temperature sensor and a remote
temperature channel, which can be connected to an on-chip
diode-connected transistor on a CPU. In addition, the two
analog input channels can be reconfigured for temperature
measurement. Any or all of these temperature channels can be
used as the basis for automatic fan speed control to drive fans
according to system temperature. By running the fans at only
the speed needed to maintain a desired temperature, acoustic
noise is reduced. Reducing fan speed can also decrease system
current consumption.
Rev. 0 | Page 29 of 48
To use automatic fan control (AFC), a number of parameters
must be set up.
Which Temperature Channel Controls Which Fan
This is determined by the AFC configuration registers (0x05
and 0x06). AFC1 configuration register controls Fan 1, and
AFC2 configuration register controls Fan 2. Setting bits in these
registers decides which temperature channels controls the fan.
Table 29. AFC Configuration Registers
Bit
Description
Bit 0
Fan controlled by TH1 or REM2
Bit 1
Fan controlled by TH2
Bit 2
Fan controlled by Remote Temperature 1
Bit 3
Fan controlled by local temperature
Bit 4
Fan under manual control
Bit 5
Fan at minimum speed
Bit 6
Fan at start-up speed
Bit 7
Fan at maximum speed
If more than one of the temperature channel Bits 0:3 are set, the
channel that demands the highest fan speed takes control.
When TH1 and TH2 are set up as AIN1 and AIN2, these pins
still control the AFC loop if Bits 0:1 in the AFC configuration
register are set. Bits 0:1 should not be set in analog input mode.
If the manual control bit is set, AFC is switched off and the
DRIVE registers can be programmed manually. This overrides
any setting of the temperature channel bits. The maximum
RPM registers, 0x34 and 0x35, should be set to 0x00 when the
fans are under manual control.
If the minimum speed bit is set, AFC is switched off and the fan
runs at minimum speed. This overrides any setting of Bits 4:0.
If the start-up speed bit is set, AFC is switched off and the fan
runs at start-up speed. This overrides any setting of Bits 5:0.
If the maximum speed bit is set, AFC is switched off and the fan
runs at maximum speed. This overrides any setting of Bits 6:0.
Fan Start Voltage (V_FAN_ON)
This is the minimum drive voltage from the DAC at which a fan
starts running. This depends on the parameters of the fan and
the characteristics of the fan drive circuit.
Minimum Fan Speed (V_FAN_MIN)
This is the minimum drive voltage from the DAC at which a fan
keeps running, which is lower than the voltage required to start
it. This depends on the parameters of the fan and the
characteristics of the fan drive circuit.
Maximum Fan Speed
For acoustic reasons it may be desirable to limit the maximum
rpm of the fans. These values are programmed into the
maximum fan speed registers (0x34 and 0x35). During AFC,
the fan speed is monitored and is never allowed to exceed the
programmed limit, even if the AFC loop demands it. However,
the maximum fan speed limit can be overridden by a THERM
event, which sets the fan drive to full scale (full speed) for
emergency cooling.
Operating Temperature Range
The temperature range over which AFC operates can be
programmed by using the TMIN and TRANGE registers.
TMIN is the temperature at which a fan starts and runs at
minimum speed when in AFC mode. TRANGE is the
temperature range over which AFC operates. Thus, if TMIN is
set to 40°C and TRANGE is set to 20°C, the fan starts when the
temperature exceeds 40°C and the fan reaches maximum speed
at a temperature of 60°C.
Enhanced Acoustics
When fan speed is controlled automatically, a temperature event
can cause the fan drive output to change instantaneously to a new
value. The sudden subsequent change in fan speed can cause an
audible noise pulse. To avoid this problem, the ADT7466 can be
programmed so that the drive value changes in a series of small
steps, using the enhanced acoustics register (0x36).
Bits 2:0 of this register allow eight step sizes from 1 to 48 bits to
be selected for Fan 1. Bits 5:3 do the same for Fan 2. When
automatic fan control requires a change in drive value, the value
changes by the step size once every 250 ms until the final value
is reached. For example, if the step size is 3 and the drive value
changes from 137 to 224, the drive value takes 29 ms × 250 ms
to reach its final value.
Enhanced acoustics for the Fan 1 output (DRIVE1) can be
enabled by setting Bit 6 of the enhanced acoustics register, and
by setting Bit 7 for Fan 2 (DRIVE2).
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相關代理商/技術參數 |
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| ADT7466ARQZ-RL7 | 功能描述:板上安裝溫度傳感器 RMT THRM CTR VLT MON RoHS:否 制造商:Omron Electronics 輸出類型:Digital 配置: 準確性:+/- 1.5 C, +/- 3 C 溫度閾值: 數字輸出 - 總線接口:2-Wire, I2C, SMBus 電源電壓-最大:5.5 V 電源電壓-最小:4.5 V 最大工作溫度:+ 50 C 最小工作溫度:0 C 關閉: 安裝風格: 封裝 / 箱體: 設備功能:Temperature and Humidity Sensor |
| ADT7466ZEVB | 功能描述:BOARD EVALUATION ADT7466 RoHS:是 類別:編程器，開發系統 >> 過時/停產零件編號 系列:dBCool® 標準包裝:1 系列:- 傳感器類型:CMOS 成像，彩色（RGB） 傳感范圍:WVGA 接口:I²C 靈敏度:60 fps 電源電壓:5.7 V ~ 6.3 V 嵌入式:否 已供物品:成像器板 已用 IC / 零件:KAC-00401 相關產品:4H2099-ND - SENSOR IMAGE WVGA COLOR 48-PQFP4H2094-ND - SENSOR IMAGE WVGA MONO 48-PQFP |
| ADT7467 | 制造商:AD 制造商全稱:Analog Devices 功能描述:dBCool Remote Thermal Monitor and Fan Controller |
| ADT7467ARQ | 功能描述:IC PWM FAN CTRLR W/MONITR 16QSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 熱管理 系列:dBCool® 標準包裝:1 系列:- 功能:溫度監控系統（傳感器） 傳感器類型:內部和外部 感應溫度:-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 供應商設備封裝:SOT-23-8 包裝:Digi-Reel® 其它名稱:296-22675-6 |
| ADT7467ARQ-REEL | 功能描述:IC REMOTE THERMAL CTRLR 16-QSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 熱管理 系列:dBCool® 標準包裝:1 系列:- 功能:溫度監控系統（傳感器） 傳感器類型:內部和外部 感應溫度:-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 供應商設備封裝:SOT-23-8 包裝:Digi-Reel® 其它名稱:296-22675-6 |
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