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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)： | 21/72頁 |
| 文件大?。?/td> | 5219K |
| 代理商： | ADT7476ARQZ-REEL7 |
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ADT7476
Rev. B | Page 28 of 72
Enabling the SMBALERT Interrupt Output
The SMBALERT interrupt function is disabled by default.
Pin 10 or Pin 14 can be reconfigured as an SMBALERT output
to signal out-of-limit conditions.
Table 15. Configuring Pin 10 as SMBALERT Output
Register
Bit Setting
Configuration Register 3 (0x78)
[1] Pin 10 = SMBALERT
[0] Pin 10 = PWM2
Assigning THERM Functionality to a Pin
Pin 14 on the ADT7476 has four possible functions: SMBALERT,
THERM, GPIO6, and TACH4. The user chooses the required
functionality by setting Bit 0 and Bit 1 of Configuration Register 4
(0x7D).
If THERM is enabled (Configuration Register 3 (0x78), Bit 1),
the following occurs:
Pin 22 becomes THERM.
If Pin 14 is configured as THERM (Bit 0 and Bit 1 of
Configuration Register 4 at Address 0x7D), THERM is
enabled on this pin.
If THERM is not enabled, the following occurs:
Pin 22 becomes a 2.5 V measurement input.
If Pin 14 is configured as THERM, then THERM is
disabled on this pin.
Table 16. Configuring Pin 14
Bit 0
Bit 1
Function
0
TACH4
0
1
THERM
1
0
SMBALERT
1
GPIO6
THERM as an Input
When THERM is configured as an input, the user can time
assertions on the THERM pin. This can be useful for connect-
ing to the PROCHOT output of a CPU to gauge system
performance.
The user can also set up the ADT7476 so that, when the
THERM pin is driven low externally, the fans run at 100%. The
fans run at 100% for the duration of the time that the THERM
pin is pulled low. This is done by setting the BOOST bit (Bit 2)
in Configuration Register 3 (0x78) to 1. This works only if the
fan is already running, for example, in manual mode when the
current duty cycle is above Register 0x00 or in automatic mode
when the temperature is above TMIN.
If the temperature is below TMIN or if the duty cycle in manual
mode is set to Register 0x00, pulling the THERM low externally
has no effect. See Figure 31 for more information.
05
38
2-
0
32
THERM
TMIN
THERM ASSERTED TO LOW AS AN INPUT:
FANS DO NOT GO TO 100% BECAUSE
TEMPERATURE IS BELOW TMIN.
THERM ASSERTED TO LOW AS AN INPUT:
FANS DO NOT GO TO 100% BECAUSE
TEMPERATURE IS ABOVE TMIN AND FANS
ARE ALREADY RUNNING.
Figure 31. Asserting THERM Low as an Input
in Automatic Fan Speed Control Mode
THERM TIMER
The ADT7476 has an internal timer to measure THERM
assertion time. For example, the THERM input can be con-
nected to the PROCHOT output of a Pentium 4 CPU to
measure system performance. The THERM input can also be
connected to the output of a trip point temperature sensor.
The timer is started on the assertion of the ADT7476 THERM
input and stopped when THERM is deasserted. The timer
counts THERM times cumulatively; that is, the timer resumes
counting on the next THERM assertion. The THERM timer
continues to accumulate THERM assertion times until the
timer is read (it is cleared on read) or until it reaches full scale.
If the counter reaches full scale, it stops at that reading until
cleared.
The 8-bit THERM timer register (0x79) is designed so that Bit 0
is set to 1 on the first THERM assertion. Once the cumulative
THERM assertion time has exceeded 45.52 ms, Bit 1 of the
THERM timer is set and Bit 0 now becomes the LSB of the
timer with a resolution of 22.76 ms (see Figure 32).
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相關代理商/技術參數(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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