參數(shù)資料
型號： ADT7473ARQZ-1REEL
廠商： ANALOG DEVICES INC
元件分類： 溫度/濕度傳感器
英文描述： DIGITAL TEMP SENSOR-SERIAL, 8BIT(s), 2.50Cel, RECTANGULAR, SURFACE MOUNT
封裝： ROHS COMPLIANT, MO-137AB, QSOP-16
文件頁數(shù)： 19/72頁
文件大?。?/td> 1494K
代理商： ADT7473ARQZ-1REEL
ADT7473/ADT7473-1
Rev. C | Page 26 of 72
04
68
6-
03
5
ADT7473/
ADT7473-1
TACH
PWM
12V
FAN
Q1
MMBT2222
3.3V
12V
665
4.7k
10k
1N4148
Figure 38. Driving a 3-Wire Fan Using an NPN Transistor
Because 4-wire fans are powered continuously, the fan speed is
not switched on or off as with previous PWM driven/powered
fans. This enables it to perform better than 3-wire fans, espe-
cially for high frequency applications.
Figure 39 shows a typical drive circuit for 4-wire fans. As the
PWM input on 4-wire fans is usually internally pulled up to a
voltage greater than 3.6 V (the maximum voltage allowed on the
ADT7473/ADT7473-1 PWM output), the PWM output should
be clamped to 3.3 V using a Zener diode.
0
468
6-
03
6
ADT7473/
ADT7473-1
TACH
PWM
12V, 4-WIRE FAN
3.3V
12V 12V
4.7k
10k
VCC
TACH
PWM
Figure 39. Driving a 4-Wire Fan
Driving Two Fans from PWM3
The ADT7473/ADT7473-1 has four TACH inputs available for
fan speed measurement, but only three PWM drive outputs. If a
fourth fan is used in the system, it should be driven from the
PWM3 output in parallel with the third fan. Figure 40 shows
how to drive two fans in parallel using low cost NPN
transistors. Figure 41 shows the equivalent circuit using a
MOSFET.
Because the MOSFET can handle up to 3.5 A, it is simply a
matter of connecting another fan directly in parallel with the
first. Care should be taken in designing drive circuits with
transistors and FETs to ensure the PWM pins are not required
to source current and that they sink less than the 8 mA
maximum current specified on the data sheet.
Driving up to Three Fans from PWM3
TACH measurements for fans are synchronized to particular
PWM channels; for example, TACH1 is synchronized to
PWM1. TACH3 and TACH4 are both synchronized to PWM3,
so PWM3 can drive two fans. Alternatively, PWM3 can be pro
grammed to synchronize TACH2, TACH3, and TACH4 to the
PWM3 output. This allows PWM3 to drive two or three fans. In
this case, the drive circuitry looks the same, as shown in
Figure 40 and Figure 41. The SYNC bit in Register 0x62 enables
this function.
Synchronization is not required in high frequency mode when
used with 4-wire fans.
04
686
-03
7
ADT7473/
ADT7473-1
PWM3
3.3V
12V
1N4148
Q1
MMBT3904
Q2
MMBT2222
Q3
MMBT2222
10k
2.2k
1k
TACH3
TACH4
3.3V
Figure 40. Interfacing Two Fans in Parallel to the PWM3 Output Using
Low Cost NPN Transistors
04
68
6-
03
8
ADT7473/
ADT7473-1
PWM3
TACH3
TACH4
3.3V
+V
TACH
Q1
NDT3055L
1N4148
5V OR
12V FAN
5V OR
12V FAN
10k
TYPICAL
10k
TYPICAL
TYPICAL
3.3V
Figure 41. Interfacing Two Fans in Parallel to the PWM3 Output Using a
Single N-Channel MOSFET
Bit [4] (SYNC) of Enhanced Acoustics Register 1 (0x62)
SYNC = 1, synchronizes TACH2, TACH3, and TACH4 to
PWM3.
TACH Inputs
Pin 4, Pin 6, Pin 7, and Pin 9 (when configured as TACH
inputs) are open-drain TACH inputs intended for fan speed
measurement.
Signal conditioning in the ADT7473/ADT7473-1
accommodates the slow rise and fall times typical of fan
tachometer outputs. The maximum input signal range is 0 V to
3.6 V. In the event that these inputs are supplied from fan
outputs that exceed 0 V to 3.6 V, either resistive attenuation of
the fan signal or diode clamping must be included to keep
inputs within an acceptable range.
Figure 42 to Figure 45 show circuits for most common fan
TACH outputs.
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參數(shù)描述
ADT7473ARQZ-1REEL7 功能描述:IC THERM MON FAN CTRLR 16-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(yuǎn)程（最大值） 拓?fù)?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
ADT7473ARQZ-1RL 功能描述:板上安裝溫度傳感器 FAN CNTRLR/INT MON 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
ADT7473ARQZ-REEL 功能描述:板上安裝溫度傳感器 FAN CNTRLR/INT MON 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
ADT7473ARQZ-REEL7 功能描述:IC REMOTE THERMAL CTRLR 16QSOP 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(yuǎn)程（最大值） 拓?fù)?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
ADT7473ARQZ-RL7 功能描述:板上安裝溫度傳感器 FAN CNTRLR/INT MON 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
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