参数资料
型号: ADT7490ARQZ-REEL7
厂商: ON Semiconductor
文件页数: 1/75页
文件大小: 0K
描述: IC THERM MON FAN CTRLR 24-QSOP
产品变化通告: MFG CHG Notification ADI to ON Semi
标准包装: 1,000
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:
输出风扇:
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)
ADT7490
Remote Thermal Monitor
and Fan Controller with
PECI Interface
The ADT7490 is a thermal monitor and multiple PWM fan
controller for noise-sensitive or power-sensitive applications requiring
active system cooling. The ADT7490 includes a local temperature
sensor, two remote temperature sensors including series resistance
cancellation, and monitors CPU temperature with a PECI interface.
The ADT7490 can drive a fan using either a low or high frequency
drive signal, and measure and control the speed of up to four fans so
they operate at the lowest possible speed for minimum acoustic noise.
The automatic fan speed control loop optimizes fan speed
for a given temperature using the PECI, remote, or local temperature
information. The effectiveness of the system’s thermal solution can be
monitored using the THERM input. The ADT7490 also provides
http://onsemi.com
QSOP ? 24 NB
CASE 492B
PIN ASSIGNMENT
critical thermal protection to the system using the bidirectional
THERM/SMBALERT pin as an output to prevent system or
component overheating.
SDA
SCL
GND
1
2
3
24 PWM1/XTO
23 V CCP
22 +2.5V IN /THERM
SMBALERT
Features
? Temperature Measurement
? 1 Local On-Chip Temperature Sensor
? 2 Remote Temperature Sensors
? 3 Current External Temperature Sensors with Series Resistance
Cancellation (SRC)
? PECI Interface for CPU Thermal Information and Support of Up
to 4 PECI Inputs on 1 Pin
? Fan Drive and Fan Speed Control
? 3 High Frequency or Low Frequency PWM Outputs for Use with
V CC 4
GPIO1 5
GPIO2 6
PECI 7
V TT 8
TACH3 9
PWM2/
10
TACH1 11
TACH2 12
ADT7490
21 +12V IN
20 +5V IN
19 I MON
18 D1+
17 D1 ?
16 D2+
15 D2 ?
14 *
13 PWM3/ADDREN
3-wire or 4-wire Fans
? 4 TACH Inputs to Measure Fan Speed
? OS Independent Automatic Fan Speed Control Based on Thermal
*TACH4/THERM/SMBALERT/ADDR SELECT
?
?
Information
? Dynamic T MIN Control Mode to Optimize System Acoustics
? Default Startup at 100% PWM for All Fans for Robust Operation
Bidirectional THERM/SMBALERT Pin to Flag Out-of-Limit and
Overtemperature Conditions
GPIO Functionality to Support Extra Features
? Can be Used for Loadline Setting for Voltage Regulation, LED
MARKING DIAGRAMS
1
ADT7490
ARQZ Assembly Lot
#DateCode
Control, or Other Functions
TOP MARKING
BOTTOM MARKING
?
?
?
I MON Monitoring for CPU Current and Power Information
Footprint and Register Compatible with ADT7473/ADT7475/
ADT7476/ADT7476A Family of Fan Controllers
SMBus Interface with Addressing Capability for Up to 3 Devices
# = Pb-Free Package
ORDERING INFORMATION
See detailed ordering and shipping information in the package
Applications
? Personal Computers
? Servers
dimensions section on page 74 of this data sheet.
? Semiconductor Components Industries, LLC, 2012
July, 2012 ? Rev. 5
1
Publication Order Number:
ADT7490/D
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