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參數(shù)資料
| 型號： | ADT7476ARQZ-REEL7 |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 溫度/濕度傳感器 |
| 英文描述： | DIGITAL TEMP SENSOR-SERIAL, 10BIT(s), 2.50Cel, RECTANGULAR, SURFACE MOUNT |
| 封裝： | ROHS COMPLIANT, MO-137AE, QSOP-24 |
| 文件頁數(shù)： | 30/72頁 |
| 文件大?。?/td> | 5219K |
| 代理商： | ADT7476ARQZ-REEL7 |
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ADT7476
Rev. B | Page 36 of 72
PWM1, PWM 2, PWM3 Frequency Registers (0x5F to 0x61)
Bits [2:0] FREQ.
000 = 11.0 Hz
001 = 14.7 Hz
010 = 22.1 Hz
011 = 29.4 Hz
100 = 35.3 Hz default
101 = 44.1 Hz
110 = 58.8 Hz
111 = 88.2 Hz
High Frequency Mode PWM Drive
Setting Bit 3 of Register 0x5F, Register 0x60, and Register 0x61
enables high frequency mode for Fan 1, Fan 2, and Fan 3,
respectively.
In high frequency mode, the PWM drive frequency is always
22.5 kHz. When high frequency mode is enabled, the dc bits
are automatically asserted internally and do not need to be
changed.
Fan Speed Control
The ADT7476 controls fan speed using automatic mode and
manual mode.
In automatic fan speed control mode, fan speed is automatically
varied with temperature and without CPU intervention once
initial parameters are set up. The advantage is that, if the system
hangs, the user is guaranteed that the system is protected from
overheating.
In manual fan speed control mode, the ADT7476 allows the
duty cycle of any PWM output to be manually adjusted. This
can be useful if the user wants to change fan speed in software
or adjust PWM duty cycle output for test purposes. Bits [7:5] of
Register 0x5C to Register 0x5E (PWM Configuration) control
the behavior of each PWM output.
PWM Configuration Registers (0x5C to 0x5E)
Bits [7:5] BHVR.
111 = manual mode
Once under manual control, each PWM output can be manu-
ally updated by writing Register 0x30 to Register 0x32 (PWMx
current duty cycle registers).
Programming the PWM Current Duty Cycle Registers
The PWM current duty cycle registers are 8-bit registers that
allow the PWM duty cycle for each output to be set anywhere
from 0% to 100% in steps of 0.39%. The value to be programmed
into the PWMMIN register is given by
Value (decimal) = PWMMIN/0.39
Example 1: For a PWM duty cycle of 50%
Value (decimal) = 50/0.39 = 128 (decimal)
Value = 128 (decimal) or 0x80 (hex)
Example 2: For a PWM duty cycle of 33%
Value (decimal) = 33/0.39 = 85 (decimal)
Value = 85 (decimal) or 0x54 (hex)
PWM Current Duty Cycle Registers
Register 0x30, PWM1 Current Duty Cycle = 0xFF (100%
default)
Register 0x31, PWM2 Current Duty Cycle = 0xFF (100%
default)
Register 0x32, PWM3 Current Duty Cycle = 0xFF (100%
default)
By reading the PWMx current duty cycle registers, the user can
keep track of the current duty cycle on each PWM output, even
when the fans are running in automatic fan speed control mode
or acoustic enhancement mode.
PROGRAMMING TRANGE
TRANGE defines the distance between TMIN and 100% PWM. For
the ADT7467, ADT7468, and ADT7473, TRANGE is effectively a
slope. For the ADT7475 and ADT7476, TRANGE is no longer a
slope but defines the temperature region where the PWM
output linearly ramps from PWMMIN to 100% PWM.
05382-047
TMIN
PWM = 100%
PWMMIN
PWMMAX
PWM = 0%
TRANGE
Figure 46. TRANGE
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADT7476EBZEVB | 功能描述:BOARD EVALUATION FOR ADT7476 RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 過時/停產(chǎn)零件編號 系列:dBCool® 標準包裝:1 系列:- 傳感器類型:CMOS 成像，彩色（RGB） 傳感范圍:WVGA 接口:I²C 靈敏度:60 fps 電源電壓:5.7 V ~ 6.3 V 嵌入式:否 已供物品:成像器板 已用 IC / 零件:KAC-00401 相關(guān)產(chǎn)品:4H2099-ND - SENSOR IMAGE WVGA COLOR 48-PQFP4H2094-ND - SENSOR IMAGE WVGA MONO 48-PQFP |
| ADT7481 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Dual Channel Temperature Sensor and Over Temperature Alarm |
| ADT7481ARMZ | 功能描述:板上安裝溫度傳感器 2 CH TEMP SNSR/ALARM 2 WIRE SMBUS INTRFCE RoHS:否 制造商:Omron Electronics 輸出類型:Digital 配置: 準確性:+/- 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: 安裝風格: 封裝 / 箱體: 設備功能:Temperature and Humidity Sensor |
| ADT7481ARMZ-001 | 功能描述:板上安裝溫度傳感器 2 CH TEMP SNSR/ALARM 2 WIRE SMBUS INTRFCE RoHS:否 制造商:Omron Electronics 輸出類型:Digital 配置: 準確性:+/- 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: 安裝風格: 封裝 / 箱體: 設備功能:Temperature and Humidity Sensor |
| ADT7481ARMZ-1 | 功能描述:IC SENSOR TEMP 2CH ALARM 10MSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 熱管理 系列:- 標準包裝: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 遠程（最大值） 拓撲:ADC，比較器，寄存器庫 輸出類型:2 線 SMBus? 輸出警報:無 輸出風扇: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 供應商設備封裝:SOT-23-8 包裝:Digi-Reel® 其它名稱:296-22675-6 |
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