參數(shù)資料
型號(hào)： ADT7463ARQ
廠商： ANALOG DEVICES INC
元件分類： 模擬信號(hào)調(diào)理
英文描述： dB COOL Remote Thermal Controller and Voltage Monitor
中文描述： SPECIALTY ANALOG CIRCUIT, PDSO24
封裝： MO-137AE, QSOP-24
文件頁(yè)數(shù)： 25/53頁(yè)
文件大?。?/td> 719K
代理商： ADT7463ARQ
REV. 0
ADT7463
–25–
Driving 2-Wire Fans
Figure 32 shows how a 2-wire fan may be connected to the
ADT7463. This circuit allows the speed of a 2-wire fan to be
measured, even though the fan has no dedicated TACH signal.
A series resistor, R
SENSE
, in the fan circuit converts the fan
commutation pulses into a voltage. This is ac-coupled into the
ADT7463 through the 0.01
μ
F capacitor. On-chip signal
condi
tioning allows accurate monitoring of fan speed. The
value of
R
SENSE
chosen depends upon the programmed input
threshold and the current drawn by the fan. For fans
drawing
approximately 200 mA, a 2
R
SENSE
value is suitable when the
threshold is programmed as 40 mV. For fans that draw more
current, such as larger desktop or server fans, R
SENSE
may be
reduced for the same programmed threshold. The smaller the
threshold programmed the better, since more voltage will be
developed across the fan and the fan will spin faster. Figure 33
shows a typical plot of the sensing waveform at a TACH/AIN
pin. The most important thing is that the voltage spikes (either
negative going or positive going) are more than 40 mV in ampli-
tude. This allows fan speed to be reliably determined.
ADT7463
TACH/AIN
PWM
10k
TYPICAL
3.3V
+V
Q1
NDT3055L
5V OR
12V FAN
R
SENSE
2
TYPICAL
0.01 F
1N4148
Figure 32. Driving a 2-Wire Fan
Figure 33. Fan Speed Sensing Waveform at
TACH/AIN Pin
LAYING OUT 2-WIRE AND 3-WIRE FANS
Figure 34 shows how to lay out a common circuit arrangement
for 2-wire and 3-wire fans. Some components will not be popu-
lated, depending on whether a 2-wire or 3-wire fan is being used.
3.3V OR 5V
TACH/AIN
PWM
12V OR 5V
Q1
MMBT2222
R4
R5
R3
C1
R2
R1
FOR 3-WIRE FANS:
POPULATE R1, R2, R3
R4 = 0
C1 = UNPOPULATED
FOR 2-WIRE FANS:
POPULATE R4, C1
R1, R2, R3 UNPOPULATED
1N4148
Figure 34. Planning for 2-Wire or 3-Wire Fans on a PCB
TACH Inputs
Pins 11, 12, 9, and 14 are open-drain TACH inputs intended
for fan speed measurement.
Signal conditioning in the ADT7463 accommodates the slow rise
and fall times typical of fan tachometer outputs. The maximum
input signal range is 0 V to 5 V, even where V
CC
is less than 5 V.
In the event that these inputs are supplied from fan outputs that
exceed 0 V to 5 V, either resistive attenuation of the fan signal
or diode clamping must be included to keep inputs within an
acceptable range.
Figures 35a to 35d show circuits for most common fan
TACH outputs.
If the fan TACH output has a resistive pull-up to
V
CC
, it can
be connected directly to the fan input, as shown in Figure 35a.
12V
ADT7463
FAN SPEED
COUNTER
TACH
TACH
OUTPUT
PULL-UP
4.7k
TYP
V
CC
Figure 35a. Fan with TACH Pull-Up to +V
CC
If the fan output has a resistive pull-up to 12 V (or other voltage
greater than 5 V) then the fan output can be clamped with a
Zener diode, as shown in Figure 35b. The Zener diode voltage
should be chosen so that it is greater than V
IH
of the TACH
input but less than 5 V, allowing for the voltage tolerance of the
Zener. A value of between 3 V and 5 V is suitable.
相關(guān)PDF資料
PDF描述
ADT7466 dBCool Remote Thermal Controller and Voltage Monitor
ADT7466ARQZ dBCool Remote Thermal Controller and Voltage Monitor
ADT7466ARQZ-REEL dBCool Remote Thermal Controller and Voltage Monitor
ADT7466ARQZ-REEL7 dBCool Remote Thermal Controller and Voltage Monitor
ADT7516 SPI/I2C Compatible, Temperature Sensor, Four Channel ADC and Quad Voltage Output DAC
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
ADT7463ARQ-REEL 功能描述:IC SENSOR TEMP FAN-CTRL 24QSOP RoHS:否 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(yuǎn)程（最大值） 拓?fù)?ADC，比較器，寄存器庫(kù) 輸出類型:2 線 SMBus? 輸出警報(bào):無(wú) 輸出風(fēng)扇:無(wú) 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
ADT7463ARQ-REEL7 功能描述:IC SENSOR TEMP FAN-CTRL 24QSOP RoHS:否 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(yuǎn)程（最大值） 拓?fù)?ADC，比較器，寄存器庫(kù) 輸出類型:2 線 SMBus? 輸出警報(bào):無(wú) 輸出風(fēng)扇:無(wú) 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
ADT7463ARQZ 功能描述:馬達(dá)/運(yùn)動(dòng)/點(diǎn)火控制器和驅(qū)動(dòng)器 SYS MGMT CNTRLR IC RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Stepper Motor Controllers / Drivers 類型:2 Phase Stepper Motor Driver 工作電源電壓:8 V to 45 V 電源電流:0.5 mA 工作溫度:- 25 C to + 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube
ADT7463ARQZ-R7 功能描述:板上安裝溫度傳感器 SYS MGMT CNTRLR IC RoHS:否 制造商:Omron Electronics 輸出類型:Digital 配置: 準(zhǔn)確性:+/- 1.5 C, +/- 3 C 溫度閾值: 數(shù)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(guān)閉: 安裝風(fēng)格: 封裝 / 箱體: 設(shè)備功能:Temperature and Humidity Sensor
ADT7463ARQZ-REEL 功能描述:板上安裝溫度傳感器 SYS MGMT CNTRLR IC RoHS:否 制造商:Omron Electronics 輸出類型:Digital 配置: 準(zhǔn)確性:+/- 1.5 C, +/- 3 C 溫度閾值: 數(shù)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(guān)閉: 安裝風(fēng)格: 封裝 / 箱體: 設(shè)備功能:Temperature and Humidity Sensor
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫(xiě)一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*