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| 型号： | ADT7473ARQZ-1REEL7 |
| 厂商： | ANALOG DEVICES INC |
| 元件分类： | 温度/湿度传感器 |
| 英文描述： | DIGITAL TEMP SENSOR-SERIAL, 8BIT(s), 2.50Cel, RECTANGULAR, SURFACE MOUNT |
| 封装： | ROHS COMPLIANT, MO-137AB, QSOP-16 |
| 文件页数： | 19/72页 |
| 文件大小： | 1494K |
| 代理商： | ADT7473ARQZ-1REEL7 |
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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
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
10k
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.
TACH outputs.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ADT7473ARQZ-1RL | 功能描述:板上安装温度传感器 FAN CNTRLR/INT MON RoHS:否 制造商:Omron Electronics 输出类型:Digital 配置: 准确性:+/- 1.5 C, +/- 3 C 温度阈值: 数字输出 - 总线接口:2-Wire, I2C, SMBus 电源电压-最大:5.5 V 电源电压-最小:4.5 V 最大工作温度:+ 50 C 最小工作温度:0 C 关闭: 安装风格: 封装 / 箱体: 设备功能:Temperature and Humidity Sensor |
| ADT7473ARQZ-REEL | 功能描述:板上安装温度传感器 FAN CNTRLR/INT MON RoHS:否 制造商:Omron Electronics 输出类型:Digital 配置: 准确性:+/- 1.5 C, +/- 3 C 温度阈值: 数字输出 - 总线接口:2-Wire, I2C, SMBus 电源电压-最大:5.5 V 电源电压-最小:4.5 V 最大工作温度:+ 50 C 最小工作温度:0 C 关闭: 安装风格: 封装 / 箱体: 设备功能:Temperature and Humidity Sensor |
| ADT7473ARQZ-REEL7 | 功能描述:IC REMOTE THERMAL CTRLR 16QSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 热管理 系列:dBCool® 标准包装:1 系列:- 功能:温度监控系统（传感器） 传感器类型:内部和外部 感应温度:-40°C ~ 125°C，外部传感器 精确度:±2.5°C 本地（最大值），±5°C 远程（最大值） 拓扑:ADC，比较器，寄存器库 输出类型:2 线 SMBus? 输出警报:无 输出风扇:无 电源电压:2.7 V ~ 5.5 V 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:SOT-23-8 供应商设备封装:SOT-23-8 包装:Digi-Reel® 其它名称:296-22675-6 |
| ADT7473ARQZ-RL7 | 功能描述:板上安装温度传感器 FAN CNTRLR/INT MON RoHS:否 制造商:Omron Electronics 输出类型:Digital 配置: 准确性:+/- 1.5 C, +/- 3 C 温度阈值: 数字输出 - 总线接口:2-Wire, I2C, SMBus 电源电压-最大:5.5 V 电源电压-最小:4.5 V 最大工作温度:+ 50 C 最小工作温度:0 C 关闭: 安装风格: 封装 / 箱体: 设备功能:Temperature and Humidity Sensor |
| ADT7473EBZEVB | 功能描述:EVALUATION BOARD ADT7473 制造商:on semiconductor 系列:* 零件状态:在售 标准包装:1 |
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