- 您現在的位置：買賣IC網 > PDF目錄67358 > ADT7476ARQZ-REEL7 (ANALOG DEVICES INC) DIGITAL TEMP SENSOR-SERIAL, 10BIT(s), 2.50Cel, RECTANGULAR, SURFACE MOUNT PDF資料下載
參數資料
| 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： | 24/72頁 |
| 文件大?。?/td> | 5219K |
| 代理商： | ADT7476ARQZ-REEL7 |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁當前第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁第49頁第50頁第51頁第52頁第53頁第54頁第55頁第56頁第57頁第58頁第59頁第60頁第61頁第62頁第63頁第64頁第65頁第66頁第67頁第68頁第69頁第70頁第71頁第72頁
ADT7476
Rev. B | Page 30 of 72
Configuring the Relevant THERM Behavior
1.
Configure the desired pin as the THERM timer input.
Setting Bit 1 (THERM timer enable) of Configuration
Register 3 (0x78) enables the THERM timer monitoring
functionality. This is disabled on Pin 14 and Pin 22 by
default.
Setting Bit 0 and Bit 1 (Pin14Func of Configuration
Register 4 (0x7D) enables THERM timer output
functionality on Pin 22 (Bit 1 of Configuration Register 3,
THERM, must also be set). Pin 14 can also be used as
TACH4.
2.
Select the desired fan behavior for THERM timer events.
Assuming that the fans are running, setting Bit 2 (BOOST
bit) of Configuration Register 3 (0x78) causes all fans to
run at 100% duty cycle whenever THERM is asserted. This
allows fail-safe system cooling. If this bit is 0, the fans run
at their current settings and are not affected by THERM
events. If the fans are not already running when THERM is
asserted, the fans do not run to full speed.
3.
Select whether THERM timer events should generate
SMBALERT interrupts.
When set, Bit 5 (F4P) of Interrupt Mask Register 2 (0x75)
or Bit 0 of Interrupt Mask Register 1 (0x74), depending on
which pins are configured as a THERM timer, masks out
the SMBALERT when the THERM timer limit value is
exceeded. This bit should be cleared if the SMBALERT
based on THERM events are required.
4.
Select a suitable THERM limit value.
This value determines whether an SMBALERT is generated
on the first THERM assertion or only if a cumulative
THERM assertion time limit is exceeded. A value of 0x00
causes an SMBALERT to be generated on the first THERM
assertion.
5.
Select a THERM monitoring time.
This value specifies how often OS- or BIOS-level software
checks the THERM timer. For example, BIOS can read the
THERM timer once an hour to determine the cumulative
THERM assertion time. If, for example, the total THERM
assertion time is <22.76 ms in Hour 1, >182.08 ms in Hour 2,
and >5.825 sec in Hour 3, this indicates that system per-
formance is degrading significantly because THERM is
asserting more frequently on an hourly basis.
Alternatively, OS- or BIOS-level software can timestamp
when the system is powered on. If an SMBALERT is gen-
erated due to the THERM timer limit being exceeded,
another timestamp can be taken. The difference in time
can be calculated for a fixed THERM timer limit time. For
example, if it takes one week for a THERM timer limit of
2.914 seconds to be exceeded, and the next time it takes
only 1 hour, this is an indication of a serious degradation in
system performance.
Configuring the THERM Pin as an Output
In addition to monitoring THERM as an input, the ADT7476 can
optionally drive THERM low as an output. When PROCHOT is
bidirectional, THERM can be used to throttle the processor by
asserting PROCHOT. The user can preprogram system-critical
thermal limits. If the temperature exceeds a thermal limit by
0.25°C, THERM asserts low. If the temperature is still above the
thermal limit on the next monitoring cycle, THERM stays low.
THERM remains asserted low until the temperature is equal to
or below the thermal limit. Because the temperature for that
channel is measured only once for every monitoring cycle, after
THERM asserts it is guaranteed to remain low for at least one
monitoring cycle.
The THERM pin can be configured to assert low, if the
Remote 1, local, or Remote 2 THERM temperature limits are
exceeded by 0.25°C. The THERM temperature limit registers
are at Register 0x6A, Register 0x6B, and Register 0x6C,
respectively. Setting Bits [7:5] of Configuration Register 5 (0x7C)
enables the THERM output feature for the Remote 2, local, and
Remote 1 temperature channels, respectively. Figure 34 shows
how the THERM pin asserts low as an output in the event of a
critical overtemperature.
MONITORING
CYCLE
TEMP
THERM LIMIT
0.25°C
THERM LIMIT
THERM
05
38
2-
03
5
Figure 34. Asserting THERM as an Output, Based on Tripping THERM Limits
An alternative method of disabling THERM is to program the
THERM temperature limit to –63°C or less in Offset 64 mode,
or 128°C or less in twos complement mode; that is, for
THERM temperature limit values less than 63°C or 128°C,
respectively, THERM is disabled.
相關PDF資料 |
PDF描述 |
|---|---|
| ADT7482ARMZ-RL | DIGITAL TEMP SENSOR-SERIAL, 11BIT(s), 2.5Cel, SQUARE, SURFACE MOUNT |
| ADT7482ARMZ-U2 | DIGITAL TEMP SENSOR-SERIAL, 11BIT(s), 2.5Cel, SQUARE, SURFACE MOUNT |
| ADT7485ARMZ-REEL | DIGITAL TEMP SENSOR-SERIAL, 16BIT(s), 1Cel, SQUARE, SURFACE MOUNT |
| ADT7485ARMZ | DIGITAL TEMP SENSOR-SERIAL, 16BIT(s), 1Cel, SQUARE, SURFACE MOUNT |
| ADT7485ARMZ-REEL7 | DIGITAL TEMP SENSOR-SERIAL, 16BIT(s), 1Cel, SQUARE, SURFACE MOUNT |
相關代理商/技術參數 |
參數描述 |
|---|---|
| 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 |
發(fā)布緊急采購，3分鐘左右您將得到回復。