LM87CIMTX/NOPB

Product Overview

• Category: Integrated Circuit (IC)
• Use: Temperature Sensor and Fan Controller
• Characteristics: High accuracy, digital output, small package size
• Package: 16-pin TSSOP
• Essence: Monitors temperature and controls fan speed accordingly
• Packaging/Quantity: Available in reels of 2500 units

Specifications

• Supply Voltage: 2.7V to 5.5V
• Temperature Range: -40°C to +125°C
• Temperature Accuracy: ±1°C
• Fan Control: PWM or linear control
• Interface: I2C/SMBus compatible

Detailed Pin Configuration

The LM87CIMTX/NOPB has a total of 16 pins. The pin configuration is as follows:

1. VDD: Supply voltage input
2. GND: Ground reference
3. SDA: Serial data input/output for I2C communication
4. SCL: Serial clock input for I2C communication
5. ALERT#: Open-drain output that indicates an alarm condition
6. TACH1: Tachometer input for fan speed monitoring
7. TACH2: Tachometer input for additional fan speed monitoring
8. FAN1: PWM output for controlling fan speed
9. FAN2: PWM output for controlling additional fan speed
10. FAN3: PWM output for controlling another fan speed
11. FAN4: PWM output for controlling yet another fan speed
12. VCC: Power supply output for external devices
13. VREF: Reference voltage output for external devices
14. VIN: Analog input for remote temperature sensing
15. NC: No connection
16. NC: No connection

Functional Features

• Monitors up to four temperature zones
• Controls fan speed based on temperature readings
• Supports both PWM and linear fan control methods
• Provides alarm indication for critical temperature conditions
• Allows remote temperature sensing through an external analog input

Advantages and Disadvantages

Advantages

• High accuracy temperature monitoring
• Flexible fan control options
• Compact package size
• Wide operating voltage range
• Easy integration with I2C/SMBus systems

Disadvantages

• Limited to 4 fan control outputs
• Requires external components for remote temperature sensing

Working Principles

The LM87CIMTX/NOPB operates by continuously measuring the temperature using its internal sensor or an external analog input. It compares the measured temperature with user-defined thresholds and adjusts the fan speed accordingly. The fan control can be implemented using either PWM or linear control methods, providing flexibility in managing the cooling requirements of various systems.

Detailed Application Field Plans

The LM87CIMTX/NOPB finds applications in a wide range of electronic devices that require temperature monitoring and fan control. Some potential application fields include:

1. Personal Computers (PCs) and Servers: Ensures optimal cooling of processors and other critical components.
2. Consumer Electronics: Regulates fan speed in televisions, gaming consoles, and audio amplifiers to prevent overheating.
3. Industrial Equipment: Controls fan operation in industrial machinery and automation systems to maintain safe operating temperatures.
4. Automotive Electronics: Monitors temperature in automotive engine compartments and adjusts fan speed accordingly.
5. Medical Devices: Provides precise temperature control in medical equipment such as incubators and laboratory instruments.

Detailed and Complete Alternative Models

1. LM75A: Digital temperature sensor with I2C interface, ±2°C accuracy, and 8-pin SOIC package.
2. MAX31725: Temperature sensor and fan controller with I2C interface, ±1°C accuracy, and 16-pin TSSOP package.
3. TMP102: Digital temperature sensor with I2C interface, ±0.5°C accuracy, and 8-pin SOIC package.
4. ADT7420: High accuracy digital temperature sensor with I2C interface, ±0.25°C accuracy, and 8-pin MSOP package.

These alternative models offer similar functionality to the LM87CIMTX/NOPB and can be considered based on specific application requirements.

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