MAX31785
MAX31785
PRODUCTION6-Channel Intelligent Fan Controller
Intelligent Fan Controller Cost-Effectively Improves System Energy Efficiency and Reliability
- Part Models
- 4
- 1ku List Price
- Starting From $5.49
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Overview
- 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
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.
Applications
- Base Stations
- Industrial Controls
- Network Switches/Routers
- Servers
- Smart Grid Network Systems
Documentation
Data Sheet 1
Design Note 1
Technical Articles 1
Device Drivers 1
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.
| Part Model | Pin/Package Drawing | Documentation | CAD Symbols, Footprints, and 3D Models |
|---|---|---|---|
| MAX31785AETL+ | LFCSP | ||
| MAX31785AETL+T | LFCSP | ||
| MAX31785ETL+ | LFCSP | ||
| MAX31785ETL+T | LFCSP |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Apr 20, 2026 - 2571D PIN/ERRATA |
||
| MAX31785AETL+T | PRODUCTION | |
| MAX31785ETL+T | PRODUCTION | |
This is the most up-to-date revision of the Data Sheet.
Software Resources
Device Drivers 1
Evaluation Software 0
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Hardware Ecosystem
Tools & Simulations
Software Development 1
Evaluation Kits
Evaluation Kit for the MAX31785
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