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| 型號(hào)： | ADT7473ARQZ-1REEL |
| 廠商： | ANALOG DEVICES INC |
| 元件分類(lèi)： | 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(yè)數(shù)： | 20/72頁(yè) |
| 文件大?。?/td> | 1494K |
| 代理商： | ADT7473ARQZ-1REEL |
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ADT7473/ADT7473-1
Rev. C | Page 27 of 72
If the fan TACH output has a resistive pull-up to VCC, it can be
connected directly to the fan input, as shown in Figure 42.
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 42. Fan with TACH Pull-Up to VCC
If the fan output has a resistive pull-up to 12 V (or other voltage
greater than 3.6 V), the fan output can be clamped with a Zener
diode, as shown in Figure 43. The Zener diode voltage should
be chosen so that it is greater than VIH of the TACH input, but
less than 3.6 V, allowing for the voltage tolerance of the Zener. A
value of between 3 V and 3.6 V is suitable.
0
468
6-
0
40
12V
VCC
PULL-UP
4.7k
TYPICAL
TACH
OUTPUT
FAN SPEED
COUNTER
TACH
ADT7473/ADT7473-1
ZD1*
*CHOOSE ZD1 VOLTAGE APPROXIMATELY 0.8 × VCC
Figure 43. Fan with TACH Pull-Up to Voltage > 3.6 V
Clamped with Zener Diode
If the fan has a strong pull-up (less than 1 kΩ) to 12 V or a
totem-pole output, a series resistor can be added to limit the
Zener current, as shown in Figure 44.
046
86
-041
12V
VCC
PULL-UP
4.7k OR
TYPICAL
TACH
OUTPUT
FAN SPEED
COUNTER
TACH
ADT7473/
ADT7473-1
ZD1
ZENER*
*CHOOSE ZD1 VOLTAGE APPROXIMATELY 0.8 × VCC
Figure 44. Fan with Strong TACH Pull-Up to > VCC or Totem-Pole Output,
Clamped with Zener and Resistor
Alternatively, a resistive attenuator can be used, as shown in
Figure 45. R1 and R2 should be chosen such that
2 V < VPULL-UP × R2/(RPULL-UP + R1 + R2) < 3.6 V
The fan inputs have an input resistance of nominally 160 kΩ to
ground, which should be taken into account when calculating
resistor values.
With a pull-up voltage of 12 V and pull-up resistor less than
1 kΩ, suitable values for R1 and R2 are 120 kΩ and 47 kΩ,
respectively. This gives a high input voltage of 3.35 V.
0
468
6-
04
2
12V
VCC
<1k
TACH
OUTPUT
FAN SPEED
COUNTER
TACH
ADT7473/
ADT7473-1
R2*
*SEE TEXT
R1*
Figure 45. Fan with Strong TACH Pull-Up to > VCC or Totem-Pole Output,
Attenuated with R1/R2
Fan Speed Measurement
The fan counter does not count the fan TACH output pulses
directly, because the fan speed could be less than 1000 RPM and
it would take several seconds to accumulate a reasonably large
and accurate count. Instead, the period of the fan revolution is
measured by gating an on-chip 90 kHz oscillator into the input
of a 16-bit counter for N periods of the fan TACH output (see
Figure 46), so the accumulated count is actually proportional to
the fan tachometer period, and inversely proportional to the fan
speed.
N, the number of pulses counted, is determined by the settings
of the TACH pulses per revolution register (Register 0x7B).
This register contains two bits for each fan, allowing one, two
(default), three, or four TACH pulses to be counted.
04
68
6-
0
4
3
1
2
3
4
CLOCK
PWM
TACH
Figure 46. Fan Speed Measurement
Fan Speed Measurement Registers
The fan tachometer readings are 16-bit values consisting of a
2-byte read from the ADT7473/ADT7473-1.
Register 0x28, TACH1 Low Byte = 0x00 default
Register 0x29, TACH1 High Byte = 0x00 default
Register 0x2A, TACH2 Low Byte = 0x00 default
Register 0x2B, TACH2 High Byte = 0x00 default
Register 0x2C, TACH3 Low Byte = 0x00 default
Register 0x2D, TACH3 High Byte = 0x00 default
Register 0x2E, TACH4 Low Byte = 0x00 default
Register 0x2F, TACH4 High Byte = 0x00 default
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相關(guān)代理商/技術(shù)參數(shù) |
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| ADT7473ARQZ-1REEL7 | 功能描述:IC THERM MON FAN CTRLR 16-QSOP RoHS:是 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(xiàn) 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(chēng):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(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(xiàn)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(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(xiàn)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(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(xiàn) 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(chēng):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(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(xiàn)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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