MAX31785：6-Channel Intelligent Fan Controller _ BDTIC a Leading Distributor in China

MAX31785：6-Channel Intelligent Fan Controller

Intelligent Fan Controller Cost-Effectively Improves System Energy Efficiency and Reliability

The MAX31785 is a closed-loop multichannel fan controller. 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 external 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.

Key Features

Six Independent Channels of Fan Control
- 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
Supports Up to 11 Temperature Sensors
- Up to Six External Thermal Diodes with Automatic Series Resistance Cancellation
- One Internal Temperature Sensor
- Up to Four I²C Digital Temperature Sensors
- Fault Detection on All Temperature Sensors
Available 6-Channel ADC to Measure Remote Voltages
PMBus™-Compliant Command Interface
I²C/SMBus-Compatible Serial Bus with Bus Timeout Function
On-Board Nonvolatile Fault Logging and Default Configuration Setting
No External Clocking Required
+3.3V Supply Voltage

MAX31785: Typical Operating Circuit

Applications/Uses

Base Stations
Industrial Controls
Network Switches/Routers
Servers
Smart Grid Network Systems

DataSheet

title	Download file
MAX31785 Data Sheet	MAX31785.pdf

Parametrics

Part Number	Sensor Type	Fan Controller Functions	Fan Cntrl.	Interface	Accuracy (±°C)	Temp. Thresh. (°C)	Temp. Resolution (bits)	Package/Pins	Budgetary Price
Part Number	Sensor Type	Fan Controller Functions	Fan Cntrl.	Interface	Accuracy (±°C)	Temp. Thresh. (°C)	Temp. Resolution (bits)	Package/Pins	See Notes
MAX31785	Remote	Dual Temperature Alarms Fan Failure Detector Remote & Local Sensor Temperature Switch/Temperature Comparator	PWM	2-Wire/I2C/SMBus	2	Programmable	12	TQFN/40	$3.48 @1k