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| 型号： | ADT7490ARQZ |
| 厂商： | ON Semiconductor |
| 文件页数： | 10/75页 |
| 文件大小： | 0K |
| 描述： | IC MON/FAN CTRLR REMOTE 24-QSOP |
| 产品变化通告： | MFG CHG Notification ADI to ON Semi QSOP 24ld Pkg (MSL) Change 17/Jun/2010 Product Discontinuation 30/Sept/2011 |
| 标准包装： | 56 |
| 系列： | dBCool® |
| 功能： | 风扇控制，温度监控器 |
| 传感器类型： | 内部和外部 |
| 感应温度： | -40°C ~ 125°C |
| 精确度： | ±1.5°C（最小值） |
| 拓扑： | ADC，比较器，风扇速度计数器，多路复用器，寄存器库 |
| 输出类型： | SMBus? |
| 输出警报： | 无 |
| 输出风扇： | 是 |
| 电源电压： | 3 V ~ 3.6 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-SSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 24-QSOP |
| 包装： | 管件 |
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ADT7490
PWM MIN
PECI MIN
Theory of Operation
The ADT7490 is a complete thermal monitor and multiple
fan controller for any system requiring thermal monitoring
and cooling. The device communicates with the system via
a serial system management bus. The serial bus controller
has a serial data line for reading and writing addresses and
data (Pin 1), and an input line for the serial clock (Pin 2). All
control and programming functions for the ADT7490 are
performed over the serial bus. In addition, Pin 14 can be
reconfigured as an SMBALERT output to signal
out-of-limit conditions.
Feature Comparisons Between the ADT7490 and
ADT7476A
The ADT7490 is pin and register map compatible with the
ADT7476A. The new or additional features are detailed in
the following sections.
PECI Input
CPU thermal information is provided through the PECI
input. The ADT7490 has PECI master capabilities and can
read the CPU thermal information through the PECI
interface. Each CPU address can have up to two PECI
domains. The ADT7490 has the ability to record four PECI
temperature readings corresponding to the four PECI
addresses of 0x30 to 0x33. The hotter of the two domains at
any given address is stored in the PECI value registers. A
PECI reading is a negative value, in degrees Celsius, which
represents the offset from the thermal control circuit (T CC )
activation temperature. PECI information is not converted
to absolute temperature reading. PECI information is in a
16-bit twos complement value; however, the ADT7490
records the sign bit as well as the bits from 12:6 in the 16-bit
PECI payload. See the Platform Environment Control
Interface (PECI) Specification from Intel ? for more details
on the PECI data format. The PECI format is represented in
Table 6.
Table 6. PECI DATA FORMAT
MSB Upper Nibble MSB Lower Nibble
S x x x x x x x
Sign Bit Integer Value (0 ? C to 127 ? C)
There are associated high and low limits for each PECI
reading that can be programmed. The limit values take the
same format as the PECI reading. Therefore, the
programmed limits are not absolute temperatures but a
relative offset in degrees Celsius from the T CC activation
temperature. An out-of-limit event is recorded as follows:
High Limit > Comparison Performed
Low Limit ? Comparison Performed
An out-of-limit event is recorded in the associated status
register and can be used to assert the SMBALERT pin.
Temperature Data REPLACE Mode
The REPLACE mode is configured by setting Bit 4 of
Register 0x36. In this mode, the data in the existing
Remote 1 registers are replaced by PECI0 data and vice
versa. This is a legacy mode that allows the thermal data
from CPU1 to be stored in the same registers as in the
ADT7476A. This reduces the software changes in systems
transitioning from CPUs with thermal diodes to CPUs with
a PECI interface. See the PECI Temperature Measurement
section for more details.
Fan Control Using PECI Information
The CPU thermal information from PECI can be used in the
existing automatic fan control algorithms. This temperature
reading remains relative to T CC activation temperature and
the associated AFC control parameters are programmed in
relative temperatures as opposed to absolute temperatures,
and are in the same format as detailed in Table 6. PECI MIN ,
T RANGE , and T CONTROL are user defined.
PWM = 100%
PWM MAX
PECI = 0
T RANGE
PWM = 0%
T CONTROL
(T MIN ) (T MAX ) T CC
Figure 17. Overview of Automatic Fan Speed Control
Using PECI Thermal Information
Dynamic T MIN Fan Control Mode
The automatic fan speed control incorporates a feature
called dynamic T MIN control. This intelligent fan control
feature reduces the design effort required to program the
automatic fan speed control loop and improves the system
acoustics.
V TT Input
The V TT voltage is monitored on Pin 8. This voltage is
also used as the reference voltage for the PECI interface. The
V TT voltage must be connected to the ADT7490 in order for
the PECI interface to be operational.
I MON Monitoring
The I MON input on Pin 19 can be used to monitor the I MON
output of ON Semiconductor’s VR10/VR11.1 controllers.
I MON is a voltage representation of the CPU current. Using
http://onsemi.com
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| ADT7490ARQZ-R7 | 功能描述:马达/运动/点火控制器和驱动器 FAN CNTRL W/PECI INT RoHS:否 制造商:STMicroelectronics 产品:Stepper Motor Controllers / Drivers 类型:2 Phase Stepper Motor Driver 工作电源电压:8 V to 45 V 电源电流:0.5 mA 工作温度:- 25 C to + 125 C 安装风格:SMD/SMT 封装 / 箱体:HTSSOP-28 封装:Tube |
| ADT7490ARQZ-REEL | 功能描述:马达/运动/点火控制器和驱动器 FAN CNTRL W/PECI INT RoHS:否 制造商:STMicroelectronics 产品:Stepper Motor Controllers / Drivers 类型:2 Phase Stepper Motor Driver 工作电源电压:8 V to 45 V 电源电流:0.5 mA 工作温度:- 25 C to + 125 C 安装风格:SMD/SMT 封装 / 箱体:HTSSOP-28 封装:Tube |
| ADT7490ARQZ-REEL7 | 功能描述:IC THERM MON FAN CTRLR 24-QSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 热管理 系列:dBCool® 标准包装:1 系列:- 功能:温度监控系统（传感器） 传感器类型:内部和外部 感应温度:-40°C ~ 125°C，外部传感器 精确度:±2.5°C 本地（最大值），±5°C 远程（最大值） 拓扑:ADC，比较器，寄存器库 输出类型:2 线 SMBus? 输出警报:无 输出风扇:无 电源电压:2.7 V ~ 5.5 V 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:SOT-23-8 供应商设备封装:SOT-23-8 包装:Digi-Reel® 其它名称:296-22675-6 |
| ADT7490ZEVB | 功能描述:BOARD EVALUATION FOR ADT7490 RoHS:是 类别:编程器，开发系统 >> 过时/停产零件编号 系列:dBCool® 标准包装:1 系列:- 传感器类型:CMOS 成像，彩色（RGB） 传感范围:WVGA 接口:I²C 灵敏度:60 fps 电源电压: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 相关产品:4H2099-ND - SENSOR IMAGE WVGA COLOR 48-PQFP4H2094-ND - SENSOR IMAGE WVGA MONO 48-PQFP |
| ADT75 | 制造商:AD 制造商全称:Analog Devices 功能描述:+-1∑C Accurate, 12-Bit Digital Temperature Sensor |
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