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| 型号： | ADT7468ARQZ-REEL |
| 厂商： | ON Semiconductor |
| 文件页数： | 35/81页 |
| 文件大小： | 0K |
| 描述： | IC REMOTE THERMAL CTRLR 24QSOP |
| 产品变化通告： | MFG CHG Notification ADI to ON Semi Product Obsolescence 11/Feb/2009 |
| 标准包装： | 2,500 |
| 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 ~ 120°C，外部传感器 |
| 精确度： | ±2°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 ~ 5.5 V |
| 工作温度： | -40°C ~ 120°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： | 带卷 (TR) |
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ADT7468
MISCELLANEOUS FUNCTIONS
OPERATING FROM 3.3 V STANDBY
The ADT7468 has been specifically designed to operate from a
3.3 V STBY supply. In computers that support S3 and S5 states,
the core voltage of the processor is lowered in these states. If
using the dynamic T MIN mode, lowering the core voltage of the
processor changes the CPU temperature and changes the
dynamics of the system under dynamic T MIN control. Likewise,
when monitoring THERM, the THERM timer should be
disabled during these states.
Dynamic T MIN Control Register 1 (Reg. 0x36)
<1> VCCPLO = 1
When the power is supplied from 3.3 V STBY and the V CCP
voltage drops below the V CCP low limit, the following occurs:
VID0
VID1
VID2
VID3
VID4
TACH1
TACH2
TACH3
1.
2.
Status Bit 1 (V CCP ) in Status Register 1 is set.
SMBALERT is generated, if enabled.
TACH4
PWM2
3.
THERM monitoring is disabled. The THERM timer
PWM3
PWM1/XTO
should hold its value prior to the S3 or S5 state.
Figure 47. XNOR Tree Test
4.
5.
Dynamic T MIN control is disabled. This prevents T MIN from
being adjusted due to an S3 or S5 state.
The ADT7468 is prevented from entering the shutdown
state.
POWER-ON DEFAULT
When the ADT7468 is powered up, it polls the V CCP input.
If V CCP stays below 0.75 V (the system CPU power rail is not
powered-up), then the ADT7468 assumes the functionality of
Once the core voltage, V CCP , goes above the V CCP low limit,
everything is re-enabled and the system resumes normal
operation.
XNOR TREE TEST MODE
The ADT7468 includes an XNOR tree test mode. This mode is
useful for in-circuit test equipment at board-level testing. By
applying a 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 (Reg. 0x6F).
Figure 47 shows the signals that are exercised in the XNOR tree
test mode.
the default registers after the ADT7468 is addressed via any
valid SMBus transaction.
If V CCP goes high (the system processor power rail is powered
up), then a fail-safe timer begins to count down. If the
ADT7468 is not addressed by any valid SMBus transaction
before the fail-safe timeout (4.6 s) lapses, then the ADT7468
drives the fans to full speed. If the ADT7468 is addressed by a
valid SMBus transaction after this point, the fans stop, and the
ADT7468 assumes its default settings and begins normal
operation.
If V CCP goes high (the system processor power rail is powered
up), then a fail-safe timer begins to count down. If the
ADT7468 has been addressed by a valid SMBus transaction
before the fail-safe timeout (4.6 sec) lapsed, then the ADT7468
operates normally, assuming the functionality of all the default
registers. See the flow chart in Figure 48.
Rev. 3 | Page 35 of 81 | www.onsemi.com
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| ADT7468ARQZ-REEL7 | 功能描述:IC REMOTE THERMAL CTRLR 24QSOP 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 |
| ADT7468ARQZ-RL7 | 功能描述:板上安装温度传感器 RMT THRM CTR VLT MON RoHS:否 制造商:Omron Electronics 输出类型:Digital 配置: 准确性:+/- 1.5 C, +/- 3 C 温度阈值: 数字输出 - 总线接口:2-Wire, I2C, SMBus 电源电压-最大:5.5 V 电源电压-最小:4.5 V 最大工作温度:+ 50 C 最小工作温度:0 C 关闭: 安装风格: 封装 / 箱体: 设备功能:Temperature and Humidity Sensor |
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| ADT7470 | 制造商:AD 制造商全称:Analog Devices 功能描述:Temperature Sensor Hub and Fan Controller |
| ADT7470_13 | 制造商:AD 制造商全称:Analog Devices 功能描述:Temperature Sensor Hub and Fan Controller |
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