7Semi EMC2301 SMBus PWM Fan Driver Board, RPM PWM Fan Controller

The 7Semi EMC2301 SMBus PWM Fan Driver Board is a compact and intelligent fan control module designed to regulate and monitor 3-wire and 4-wire PWM cooling fans. Based on the EMC2301 fan controller IC, it provides precise fan speed control through an SMBus/I²C-compatible interface. With programmable PWM frequency, closed-loop RPM control, stall detection, and system alerts, it is ideal for thermal management in embedded systems, computers, networking equipment, and industrial electronics.

Technical Specification:

• Communication Interface: SMBus / I²C compatible
• Supported Fans: 3-wire and 4-wire PWM fans
• PWM Frequency Range: Programmable from approximately 9.5 Hz to 26 kHz
• Supply Voltage: Typically 3.0V to 3.6V
• Fan Control Modes: Direct PWM control and closed-loop RPM control
• Monitoring Functions: Stall detection, aging fan detection, RPM feedback, alert output (ALERT#)
• Additional Outputs: Clock (CLK) output for multi-device synchronization
• Operating Temperature Range: –40°C to +125°C (controller IC capability)

Features:

• Provides precise PWM-based fan speed control
• Supports both 3-wire and 4-wire fans
• Programmable PWM frequency for noise and performance optimization
• Closed-loop RPM-based control for stable and accurate fan speed
• Built-in stall and aging detection for enhanced reliability
• Alert output for notifying host systems of fan issues
• SMBus/I²C interface makes integration easy with microcontrollers and embedded processors
• Compact module suitable for prototypes and production designs

Applications:

• PC, laptop, and server cooling systems
• Embedded systems requiring intelligent fan control
• Industrial equipment, networking gear, and communication devices
• IoT gateways and edge devices with active cooling
• Projectors, AV equipment, and devices where quiet and reliable cooling is essential
• Custom electronic projects needing fan speed regulation and monitoring