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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)： | 48/72頁 |
| 文件大?。?/td> | 5219K |
| 代理商： | ADT7476ARQZ-REEL7 |
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ADT7476
Rev. B | Page 52 of 72
How Fan Presence Detect Works
Typically, 4-wire fans have an internal pull-up to 4.75 V ± 10%,
which typically sources 5 mA. While the detection cycle is on,
an internal current sink is turned on, sinking current from the
fan’s internal pull-up. By driving some of the current from the
fan’s internal pull-up (~100 μA), the logic buffer switches to a
defined logic state. If this state is high, a fan is present; if the
state is low, no fan is present.
Note that the PWM input voltage should be clamped to 3.3 V.
This ensures that the PWM output is not pulled to a voltage
higher than the maximum allowable voltage on that pin (3.6 V).
FAN SYNC
When two ADT7476s are used in a system, it is possible to
synchronize them so that one PWM channel from each device
can be effectively OR’ed together to create a PWM output that
reflects the maximum speed of the two OR’ed PWMs. This
OR’ed PWM can in turn be used to drive a chassis fan. See the
Analog Devices website, located at www.analog.com, for
information about the Fan sync function.
STANDBY MODE
The ADT7476 is specifically designed to respond to the STBY
supply. In computers that support S3 and S5 states, the core
voltage of the processor is lowered in these states. When
monitoring THERM, the THERM timer should be disabled
during these states.
When the VCCP voltage drops below the VCCP low limit, the
following occurs:
1.
Status Bit 1 (VCCP) in Status Register 1 is set.
2.
SMBALERT is generated, if enabled.
3.
THERM monitoring is disabled. The THERM timer
should hold its value prior to the S3 or S5 state.
Once the core voltage, VCCP, goes above the VCCP low limit,
everything is re-enabled and the system resumes normal
operation.
XNOR TREE TEST MODE
The ADT7476 includes an XNOR tree test mode. This mode is
useful for in-circuit test equipment at board-level testing. By
applying stimulus to the pins included in the XNOR tree, it is
possible to detect opens, or shorts, on the system board.
The XNOR tree test is invoked by setting Bit 0 (XEN) of the
XNOR tree test enable register (0x6F).
Figure 66 shows the signals that are exercised in the XNOR tree
test mode.
PWM1/XTO
PWM3
PWM2
TACH4
TACH3
TACH2
TACH1
VID4
VID3
VID2
VID1
VID0
05382-067
Figure 66. XNOR Tree Test
POWER-ON DEFAULT
When the ADT7476 is powered up, monitoring is off by default
and the PWM outputs go to 100%. All necessary registers then
need to be configured via the SMBus for the appropriate
functions to operate.
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相關(guān)代理商/技術(shù)參數(shù) |
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| 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(biāo)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(fēng)格: 封裝 / 箱體: 設(shè)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(fēng)格: 封裝 / 箱體: 設(shè)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(biāo)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(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(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 |
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