19-5703; Rev 1; 11/11
6-Channel Intelligent Fan Controller
General Description
Features
S Six Independent Channels of Fan Control
The MAX31785 is a closed-loop multichannel fan con-
troller. Automatic closed-loop fan control saves system
power by operating the fans at the lowest possible
speeds. Added benefits of slower fan speeds include
lower audible noise, longer fan life, and reduced system
maintenance. Based on a user-programmable lookup
table (LUT), the device automatically adjusts the speeds
of the six independent fans based on one or more of the
11 available temperature sensors. Alternately, an exter-
nal host can manually command the fan speeds and the
device automatically adjusts the fan speeds. The device
contains a fan-health-diagnostic function to help users
predict impending fan failures. The device can also
monitor up to six remote voltages.
Supports 3-Wire and 4-Wire Fans
Automatic Closed-Loop Fan Speed Control
RPM- or PWM-Based Control
Optional Manual Mode Control
Fast and Slow PWM Frequency Options
Staggered Fan Spin-Up Eases Power-Supply
Stress
Dual Tachometer (12-Fan Support)
Fan-Fault Detection
Fan-Health Status Meter
Nonvolatile Fan Operating Run Time Meter
S Supports Up to 11 Temperature Sensors
Up to Six External Thermal Diodes with
Automatic Series Resistance Cancellation
One Internal Temperature Sensor
Applications
Network Switches/Routers
Base Stations
2
Up to Four I C Digital Temperature Sensors
Fault Detection on All Temperature Sensors
S Available 6-Channel ADC to Measure Remote
Servers
Voltages
Smart Grid Network Systems
Industrial Controls
S PMBus™-Compliant Command Interface
2
S I C/SMBus-Compatible Serial Bus with Bus
Timeout Function
Ordering Information
S On-Board Nonvolatile Fault Logging and Default
PART
TEMP RANGE
-40NC to +85NC
-40NC to +85NC
PIN-PACKAGE
40 TQFN-EP*
40 TQFN-EP*
Configuration Setting
MAX31785ETL+
MAX31785ETL+T
S No External Clocking Required
S +3.3V Supply Voltage
+Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
*EP = Exposed pad.
PMBus is a trademark of SMIF, Inc.
Note: Some revisions of this device may incorporate deviations from published specifications known as errata. Multiple revisions of any device
may be simultaneously available through various sales channels. For information about device errata, go to: www.maxim-ic.com/errata.
_______________________________________________________________ Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
5秒后页面跳转
全球首块英伟达H200交付 黄仁勋“送货上门”
常用8脚开关电源芯片型号大全
74HC04芯片引脚图及功能、应用电路图讲解
CR6842芯片参数、引脚配置、应用电路图详解
微信公众号
抖音公众号
浙公网安备 33010502006866号 浙ICP备10014259号-119
营业执照ICP证
数据手册
如果您发现信息不准确，
