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| 型號(hào)： | 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)： | 47/72頁 |
| 文件大?。?/td> | 1494K |
| 代理商： | ADT7473ARQZ-1REEL |
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ADT7473/ADT7473-1
Rev. C | Page 51 of 72
0
468
6-
0
73
ACOUSTIC
ENHANCEMENT
REAR CHASSIS
FRONT CHASSIS
CPU FAN SINK
LOCAL =
VRM TEMP
PWM1
PWM2
TACH1
TACH2
TACH3
PWM3
REMOTE 1 =
AMBIENT TEMP
REMOTE 2 =
CPU TEMP
MUX
THERMAL CALIBRATION
0%
TMIN
TRANGE
THERMAL CALIBRATION
100%
0%
TMIN
TRANGE
THERMAL CALIBRATION
100%
0%
TMIN
TRANGE
TACHOMETER 1
MEASUREMENT
PWM
CONFIG
PWM
MIN
RAMP
CONTROL
(ACOUSTIC
ENHANCEMENT)
PWM
GENERATOR
TACHOMETER 2
MEASUREMENT
PWM
CONFIG
PWM
MIN
RAMP
CONTROL
(ACOUSTIC
ENHANCEMENT)
PWM
GENERATOR
TACHOMETER 3
AND 4
MEASUREMENT
PWM
CONFIG
PWM
MIN
RAMP
CONTROL
(ACOUSTIC
ENHANCEMENT)
PWM
GENERATOR
100%
Figure 76. Acoustic Enhancement Smoothes Fan Speed Variations Under Automatic Fan Speed Control
The fan-centric approach to system acoustic enhancement
controls the PWM duty cycle, driving the fan at a fixed rate (for
example, 6%). Each time the PWM duty cycle is updated, it is
incremented by a fixed 6%. As a result, the fan ramps smoothly
to its newly calculated speed. If the temperature starts to drop,
the PWM duty cycle immediately decreases by 6% at every
update. Therefore, the fan ramps smoothly up or down without
inherent system delay. Consider, for example, controlling the
same CPU cooler fan (on PWM1) and chassis fan (on PWM2)
using Remote 1 temperature. The TMIN and TRANGE settings have
already been defined in automatic fan speed control mode, that
is, thermal characterization of the control loop has been optimized.
Here, the chassis fan is noisier than the CPU cooling fan. Using
the fan-centric approach, PWM2 can be placed into acoustic
enhancement mode independently of PWM1. The acoustics of
the chassis fan can, therefore, be adjusted without affecting the
acoustic behavior of the CPU cooling fan, even though both
fans are controlled by Remote 1 temperature. The fan-centric
approach is how acoustic enhancement works on the ADT7473/
ADT7473-1.
Enabling Acoustic Enhancement for Each PWM Output
Enhanced acoustics Register 1 (0x62)
Bit 3 = 1, enables acoustic enhancement on PWM1 output
Enhanced acoustics Register 2 (0x63)
Bit 7 = 1, enables acoustic enhancement on PWM2 output
Bit 3 = 1, enables acoustic enhancement on PWM3 output
Effect of Ramp Rate on Enhanced Acoustics Mode
The PWM signal driving the fan has a period, T, given by the
PWM drive frequency, f, because T = 1/f. For a given PWM
period, T, the PWM period is subdivided into 255 equal time
slots. One time slot corresponds to the smallest possible incre-
ment in the PWM duty cycle. A PWM signal of 33% duty cycle
is, therefore, high for 1/3 × 255 time slots and low for 2/3 × 255
time slots. Therefore, a 33% PWM duty cycle corresponds to a
signal that is high for 85 time slots and low for 170 time slots.
170
TIME SLOTS
85
TIME SLOTS
PWM OUTPUT
(ONE PERIOD)
= 255 TIME SLOTS
PWM_OUT
33% DUTY
CYCLE
04
68
6-
0
74
Figure 77. 33% PWM Duty Cycle Represented in Time Slots
The ramp rates in the enhanced acoustics mode are selectable from
the values 1, 2, 3, 5, 8, 12, 24, and 48. The ramp rates are discrete
time slots. For example, if the ramp rate is 8, then eight time slots
are added to the PWM high duty cycle each time the PWM duty
cycle needs to be increased. If the PWM duty cycle value needs
to be decreased, it is decreased by eight time slots. Figure 78
shows how the enhanced acoustics mode algorithm operates.
The enhanced acoustics mode algorithm calculates a new
PWM duty cycle based on the temperature measured. If the
new PWM duty cycle value is greater than the previous PWM
value, then the previous PWM duty cycle value is incremented
by either 1, 2, 3, 5, 8, 12, 24, or 48 time slots, depending on the
settings of the enhanced acoustics registers. If the new PWM
duty cycle value is less than the previous PWM value, the
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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(bào):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 |
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| 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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