参数资料
| 型号： | ADT7475EBZEVB |
| 厂商： | ON Semiconductor |
| 文件页数： | 27/58页 |
| 文件大小： | 0K |
| 描述： | BOARD EVALUATION FOR ADT7475 |
| 产品变化通告： | MFG CHG Notification ADI to ON Semi |
| 标准包装： | 1 |
| 系列： | dBCool® |
| 类型： | 温度传感器 |
| 适用于相关产品： | ADT7475 |
| 所含物品： | 评估板 |
| 其它名称： | EVAL-ADT7475EB EVAL-ADT7475EB-ND |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页当前第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页第37页第38页第39页第40页第41页第42页第43页第44页第45页第46页第47页第48页第49页第50页第51页第52页第53页第54页第55页第56页第57页第58页
ADT7475
speed control mode or acoustic enhancement mode. See the
Programming the Automatic Fan Speed Control Loop
section for details.
Operating from 3.3 V Standby
The ADT7475 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. When monitoring THERM, the THERM timer
should be disabled during these states.
Standby Mode
The ADT7475 has been 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 V CCP voltage drops below the V CCP low limit,
the following occurs:
of the default registers after the ADT7475 is addressed via
any valid SMBus transaction.
If V CC goes high (the system processor power rail is
powered up), a fail-safe timer begins to count down. If the
ADT7475 is not addressed by any valid SMBus transactions
before the fail-safe timeout (4.6 seconds) lapses, the
ADT7475 drives the fans to full speed. If the ADT7475 is
addressed by a valid SMBus transaction after this point, the
fans stop, and the ADT7475 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 ADT7475 is addressed by a valid SMBus transaction
before the fail-safe timeout (4.6 seconds) lapses, then the
ADT7475 operates normally, assuming the functionality of
all the default registers. See the flow chart in Figure 41.
ADT7475 IS POWERED UP
1. Status Bit 1 (V CCP ) 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.
Y
HAS THE ADT7475 BEEN
ACCESSED BY A VALID
SMBus TRANSACTION?
N
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
IS V CCP ABOVE 0.75 V?
Y
START FAIL-SAFE TIMER
N
CHECK V CCP
The ADT7475 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.
Figure 40 shows the signals that are exercised in the XNOR
tree test mode. The XNOR tree test is invoked by setting Bit 0
(XEN) of the XNOR tree test enable register (0x6F).
Y
HAS THE ADT7475 BEEN
ACCESSED BY A VALID
SMBus TRANSACTION?
N
FAIL-SAFE TIMER
ELAPSES AFTER THE
FAIL-SAFE TIMEOUT
TACH1
TACH2
HAS THE ADT7475 BEEN
ACCESSED BY A VALID
SMBus TRANSACTION?
N
RUNS THE FANS
TO FULL SPEED
TACH3
TACH4
Y
HAS THE ADT7475 BEEN
ACCESSED BY A VALID
SMBus TRANSACTION?
N
Y
PWM2
START UP THE ADT7475
NORMALLY
SWITCH OFF FANS
PWM3
PWM1/XTO
Figure 41. Power-on Flow Chart
Figure 40. XNOR Tree Test
Power-On Default
When the ADT7475 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), the ADT7475 assumes the functionality
Programming the Automatic Fan Speed Control Loop
To more efficiently understand the automatic fan speed
control loop, it is strongly recommended to use the ADT7475
evaluation board and software while reading this section.
This section provides the system designer with an
understanding of the automatic fan control loop, and
provides step-by-step guidance on effectively evaluating
http://onsemi.com
27
相关PDF资料 |
PDF描述 |
|---|---|
| ADT7476EBZEVB | BOARD EVALUATION FOR ADT7476 |
| ADT7490ZEVB | BOARD EVALUATION FOR ADT7490 |
| ADZS-21262-1-EZEXT | BOARD DAUGHTER FOR ADSP-21262 |
| ADZS-BF-EZEXT-1 | BOARD DAUGHTER ADSP-BF533/561KIT |
| ADZS-BFAV-EZEXT | BOARD DAUGHT ADSP-BF533,37,61KIT |
相关代理商/技术参数 |
参数描述 |
|---|---|
| ADT7476 | 制造商:AD 制造商全称:Analog Devices 功能描述:dBCool Remote Thermal Controller and Voltage Monitor |
| ADT7476A | 制造商:AD 制造商全称:Analog Devices 功能描述:dBCool Remote Thermal Controller and Voltage Monitor |
| ADT7476AARQZ | 功能描述:马达/运动/点火控制器和驱动器 MONITORS 5V/4 FANS 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 |
| ADT7476AARQZ-R | 功能描述:板上安装温度传感器 MONITORS 5V/4 FANS 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 |
| ADT7476AARQZ-REEL | 功能描述:IC REMOTE THERMAL 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 |
发布紧急采购，3分钟左右您将得到回复。