參數(shù)資料
型號(hào)： ADT7463ARQ
廠商： ANALOG DEVICES INC
元件分類(lèi)： 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)： 23/53頁(yè)
文件大?。?/td> 719K
代理商： ADT7463ARQ
REV. 0
ADT7463
–23–
Alternatively, OS or BIOS level software can time-stamp
when the system is powered on. If an
SMBALERT
is gener-
ated due to the
THERM
limit being exceeded, another
time-stamp can be taken. The difference in time can be
calculated for a fixed
THERM
limit time. For example, if it
takes one week for a
THERM
limit of 2.914 s to be
exceeded and the next time it takes only 1 hour, then this is
an indication of a serious degradation in system performance.
Configuring the ADT7463
THERM
Pin as an Output
In addition to the ADT7463 being able to monitor
THERM
as
an input, the ADT7463 can optionally drive
THERM
low as an
output. The user can preprogram system critical thermal limits.
If the temperature exceeds a thermal limit by 0.25
°
C,
THERM
will assert low. If the temperature is still above the thermal limit
on the next monitoring cycle,
THERM
will stay low.
THERM
will remain asserted low until the temperature is equal to or
below the thermal limit. Since the temperature for that channel
is measured only every monitoring cycle, once
THERM
asserts
it is guaranteed to remain low for at least one monitoring cycle.
The
THERM
pin can be configured to assert low if the
Remote 1, Local, or Remote 2 Temperature
THERM
Limits get
exceeded by 0.25
°
C. The
THERM
Limit Registers are at loca-
tions 0x6A, 0x6B, and 0x6C respectively. Setting Bit 3 of
Registers 0x5F, 0x60, and 0x61 enables the
THERM
output
feature for the Remote 1, Local, and Remote 2 Temperature
channels, respectively. Figure 27 shows how the
THERM
pin
asserts low as an output in the event of a critical overtemperature.
THERM
LIMIT
+0.25 C
THERM
LIMIT
TEMP
THERM
ADT7463
MONITORING
CYCLE
Figure 27. Asserting
THERM
as an Output, Based
on Tripping
THERM
Limits
FAN DRIVE USING PWM CONTROL
The ADT7463 uses Pulsewidth Modulation (PWM) to control
fan speed. This relies on varying the duty cycle (or on/off ratio)
of a square wave applied to the fan to vary the fan speed. The
external circuitry required to drive a fan using PWM control is
extremely simple. A single NMOSFET is the only drive device
required. The specifications of the MOSFET depend on the
maximum current required by the fan being driven. Typical
notebook fans draw a nominal 170 mA, and so SOT devices can
be used where board space is a concern. In desktops, fans can
typically draw 250 mA–300 mA each. If you drive several fans
in parallel from a single PWM output or drive larger server fans,
the MOSFET will need to handle the higher current requirements.
The only other stipulation is that the MOSFET should have a
gate voltage drive, V
GS
< 3.3 V for direct interfacing to the
PWM_OUT pin. V
GS
can be greater than 3.3 V as long as the
pull-up on the gate is tied to 5 V. The MOSFET should also
have a low on resistance to ensure that there is not significant
voltage drop across the FET. This would reduce the voltage
applied across the fan and therefore the maximum operating
speed of the fan.
Figure 28 shows how a 3-wire fan may be driven using PWM
control.
ADT7463
TACH/AIN
PWM
4.7k
10k
10k
10k
3.3V
12V
12V
12V
FAN
Q1
NDT3055L
TACH
1N4148
Figure 28. Driving a 3-Wire Fan Using an
N-Channel MOSFET
Figure 28 uses a 10 k
pull-up resistor for the TACH signal. This
assumes that the TACH signal is open-collector from the fan. In
all cases, the TACH signal from the fan
must
be kept below 5 V
maximum to prevent damaging the ADT7463. If in doubt as to
whether the fan used has an open-collector or totem pole
TACH output, use one of the input signal conditioning circuits
shown in the Fan Speed Measurement
section of the data sheet.
Figure 29 shows a fan drive circuit using an NPN transistor
such as a general-purpose MMBT2222. While these devices are
inexpensive, they tend to have much lower current handling
capabilities and higher on-resistance than MOSFETs. When
choosing a transistor, care should be taken to ensure that it
meets the fan’s current requirements.
Ensure that the base resistor is chosen such that the transistor is
saturated when the fan is powered on.
ADT7463
TACH/AIN
PWM
4.7k
10k
10k
470
3.3V
12V
12V
12V
FAN
Q1
MMBT2222
1N4148
TACH
Figure 29. Driving a 3-Wire Fan Using an NPN Transistor
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(lèi)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(lèi)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(lèi)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(lèi)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(lèi)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(lèi)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(lèi)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(lèi)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(lèi)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(lèi)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(lèi)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

*
*
*