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| 型号： | ADT7476AARQZ-R |
| 厂商： | ON Semiconductor |
| 文件页数： | 8/66页 |
| 文件大小： | 945K |
| 描述： | IC REMOTE THERMAL CTLR 24QSOP |
| 产品变化通告： | MFG CHG Notification ADI to ON Semi QSOP 24ld Pkg (MSL) Change 17/Jun/2010 |
| 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 ~ 125°C |
| 精确度： | ±2.5% |
| 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： | 带卷 (TR) |
| 其它名称： | ADT7476AARQZ-R-ND ADT7476AARQZ-ROSTR |
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ADT7476A
http://onsemi.com
8
Product Description
The ADT7476A 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
ADT7476A are performed over the serial bus. In addition,
a pin can be reconfigured as an SMBALERT
output to signal
out-of-limit conditions.
Feature Comparisons Between ADT7476A
and ADT7468
?SPAN class="pst ADT7476AARQZ-R_2298076_3"> Dynamic T
MIN
, dynamic operating point, and
associated registers are no longer available in the
ADT7476A. The following related registers are gone:
?SPAN class="pst ADT7476AARQZ-R_2298076_3"> Calibration Control 1 (0x36)
?SPAN class="pst ADT7476AARQZ-R_2298076_3"> Calibration Control 2 (0x37)
?SPAN class="pst ADT7476AARQZ-R_2298076_3"> Operating Point (0x33, 0x34, and 0x35)
?SPAN class="pst ADT7476AARQZ-R_2298076_3"> Previously (in the ADT7468), T
RANGE
defined the slope
of the automatic fan control algorithm. T
RANGE
now
defines a true temperature range (in the ADT7476A).
?SPAN class="pst ADT7476AARQZ-R_2298076_3"> Acoustic filtering is now assigned to temperature zones,
not to fans. Available smoothing times have been
increased for better acoustic performance.
?SPAN class="pst ADT7476AARQZ-R_2298076_3"> Temperature measurements are now made with two
switching currents instead of three. SRC is not available
in the ADT7476A.
?SPAN class="pst ADT7476AARQZ-R_2298076_3"> High frequency PWM can now be enabled/disabled on
each PWM output individually.
?SPAN class="pst ADT7476AARQZ-R_2298076_3"> THERM
can now be enabled/disabled on each
temperature channel individually.
?SPAN class="pst ADT7476AARQZ-R_2298076_3"> The ADT7476A does not support full shutdown mode.
?SPAN class="pst ADT7476AARQZ-R_2298076_3"> The ADT7476A offers increased temperature accuracy
on all temperature channels.
?SPAN class="pst ADT7476AARQZ-R_2298076_3"> The ADT7476A defaults to twos complement
temperature measurement mode.
?SPAN class="pst ADT7476AARQZ-R_2298076_3"> Some pins have swapped/added functions.
?SPAN class="pst ADT7476AARQZ-R_2298076_3"> The powerup routine for the ADT7476A is simplified.
?SPAN class="pst ADT7476AARQZ-R_2298076_3"> The ADT7476A has a higher maximum input voltage
TACH/PWM spec, supporting a wider range of fans.
?SPAN class="pst ADT7476AARQZ-R_2298076_3"> V
CORE_LOW_ENABLE
has been reallocated to Bit 7 of
Configuration Register 1 (0x40).
Recommended Implementation
Configuring the ADT7476A as shown in Figure 13 allows
the system designer to use the following features:
?SPAN class="pst ADT7476AARQZ-R_2298076_3"> Two PWM outputs for fan control of up to three fans
(the front and rear chassis fans are connected in
parallel).
?SPAN class="pst ADT7476AARQZ-R_2298076_3"> Three TACH fan speed measurement inputs.
?SPAN class="pst ADT7476AARQZ-R_2298076_3"> V
CC
measured internally through Pin 4.
?SPAN class="pst ADT7476AARQZ-R_2298076_3"> CPU temperature measured using Remote 1
temperature channel.
?SPAN class="pst ADT7476AARQZ-R_2298076_3"> Remote temperature zone measured through Remote 2
temperature channel.
?SPAN class="pst ADT7476AARQZ-R_2298076_3"> Local temperature zone measured through the internal
temperature channel.
?SPAN class="pst ADT7476AARQZ-R_2298076_3"> Bidirectional THERM
pin. This feature allows
Intel
?/DIV>
Pentium
?/DIV>
4 PROCHOT
monitoring and can
function as an overtemperature THERM
output. It can
alternatively be programmed as an SMBALERT
system
interrupt output.
Figure 13. ADT7476A Configuration
AMBIENT
TEMPERATURE
FRONT
CHASSIS
FAN
REAR
CHASSIS
FAN
ADT7476A
PWM1
SMBALERT
TACH2
PROCHOT
TACH1
GND
VID[0:4]/VID[0:5]
D2+
D2
THERM
SDA
SCL
TACH3
PWM3
D1
D1+
V
CC
+5V
IN
+12V
IN
/VID5
5(VRM9)/6(VRM10)
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| ADT7476AARQZ-REEL7 | 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 |
| ADT7476AARQZ-RL7 | 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 |
| ADT7476ARQH | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:dBCOOL Remote Thermal Controller and Voltage Monitor |
| ADT7476ARQH-REEL | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:dBCOOL Remote Thermal Controller and Voltage Monitor |
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