MAX6651EEE

Product Overview

• Category: Integrated Circuit (IC)
• Use: Temperature Sensor and Fan Controller
• Characteristics:
  • Monitors temperature and controls fan speed
  • Provides accurate temperature measurements
  • Controls up to four fans
  • Offers programmable temperature thresholds
• Package: 16-pin QSOP (Quarter Small Outline Package)
• Essence: Combines temperature sensing and fan control in a single IC
• Packaging/Quantity: Available in tape and reel packaging, quantity varies based on supplier

Specifications

• Supply Voltage: 2.7V to 5.5V
• Temperature Measurement Range: -55°C to +125°C
• Temperature Accuracy: ±1°C
• Fan Control Method: PWM (Pulse Width Modulation)
• Number of Fans Controlled: Up to 4
• Programmable Temperature Thresholds: Yes
• Communication Interface: I2C (Inter-Integrated Circuit)

Pin Configuration

The MAX6651EEE has a total of 16 pins. The pin configuration is as follows:

1. VDD - Power supply voltage
2. GND - Ground
3. SDA - I2C data line
4. SCL - I2C clock line
5. ALERT - Interrupt output for temperature/fan status
6. TACH1 - Tachometer input for fan 1
7. TACH2 - Tachometer input for fan 2
8. TACH3 - Tachometer input for fan 3
9. TACH4 - Tachometer input for fan 4
10. FAN1 - PWM output for fan 1
11. FAN2 - PWM output for fan 2
12. FAN3 - PWM output for fan 3
13. FAN4 - PWM output for fan 4
14. VDD - Power supply voltage
15. GND - Ground
16. NC - No connection

Functional Features

• Temperature Monitoring: The MAX6651EEE accurately measures temperature using an internal sensor.
• Fan Control: It controls the speed of up to four fans based on the measured temperature.
• Programmable Thresholds: Users can set temperature thresholds to trigger fan speed adjustments.
• PWM Output: The IC generates PWM signals for controlling fan speed.
• Interrupt Output: The ALERT pin provides an interrupt signal when temperature or fan status exceeds programmed limits.

Advantages and Disadvantages

Advantages: - Integration: Combines temperature sensing and fan control in a single IC, reducing component count and board space. - Accuracy: Provides precise temperature measurements with ±1°C accuracy. - Flexibility: Allows programming of temperature thresholds and fan speed control parameters.

Disadvantages: - Limited Fan Control: Supports up to four fans only, may not be suitable for systems with more fans. - I2C Interface: Relies on the I2C communication protocol, which may require additional circuitry and complexity.

Working Principles

The MAX6651EEE operates by continuously monitoring the temperature using its internal sensor. It compares the measured temperature with user-programmed thresholds. Based on the temperature readings, it adjusts the fan speeds using PWM signals. The IC communicates with the system controller through the I2C interface, providing temperature and fan status information.

Application Field Plans

The MAX6651EEE is commonly used in various applications, including: - Personal Computers (PCs) - Servers - Network Equipment - Industrial Control Systems - Consumer Electronics

In these applications, the IC ensures efficient cooling by monitoring temperature and adjusting fan speeds accordingly.

Alternative Models

There are several alternative models available that offer similar functionality to the MAX6651EEE. Some notable alternatives include: - LM75A: Digital Temperature Sensor and Thermal Watchdog - DS1621: Digital Thermometer and Thermostat - ADT7463: System Temperature Monitor and PWM Fan Controller

These alternative models provide temperature sensing and fan control capabilities, catering to different design requirements.

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