LM81CIMTX-3/NOPB

Product Overview

Category: Integrated Circuit (IC)

Use: Temperature Sensor and System Monitor

Characteristics: - Measures temperature accurately - Monitors system voltage, fan speed, and other parameters - Provides digital output for easy interfacing with microcontrollers - Low power consumption - Small form factor

Package: SOT-23-6

Essence: The LM81CIMTX-3/NOPB is a versatile integrated circuit that combines temperature sensing and system monitoring capabilities in a compact package. It is designed to provide accurate temperature measurements and monitor various system parameters.

Packaging/Quantity: The LM81CIMTX-3/NOPB is available in a SOT-23-6 package. It is typically sold in reels containing a large quantity of units.

Specifications

• Temperature Measurement Range: -40°C to +125°C
• Temperature Accuracy: ±2°C
• Supply Voltage Range: 2.7V to 5.5V
• Digital Output Interface: I2C/SMBus
• System Monitoring Parameters:
  • System Voltage
  • Fan Speed
  • Remote Diode Temperature
  • Local Temperature

Pin Configuration

The LM81CIMTX-3/NOPB has six pins arranged as follows:

```

---

| | --| VDD GND |-- Pin 1: Ground (GND) --| SDA SCL |-- Pin 2: Serial Data (SDA) --| ALERT |-- Pin 3: Alert Output (ALERT) --| OS |-- Pin 4: Overtemperature Shutdown (OS) --| VCC |-- Pin 5: Supply Voltage (VCC) |___________| ```

Functional Features

1. Temperature Sensing: The LM81CIMTX-3/NOPB accurately measures temperature within the range of -40°C to +125°C. It provides a digital output that can be easily read by microcontrollers.

2. System Monitoring: This IC monitors various system parameters such as system voltage, fan speed, and remote diode temperature. It enables efficient system management and helps prevent overheating or other critical conditions.

3. Alert Functionality: The ALERT pin provides an output signal that can be used to trigger an interrupt or alert in the system when certain conditions are met. This allows for timely actions to be taken based on the monitored parameters.

Advantages

• Compact size and low power consumption make it suitable for space-constrained applications.
• Accurate temperature measurements ensure reliable thermal management.
• Versatile system monitoring capabilities enhance overall system performance and reliability.
• Digital output interface simplifies integration with microcontrollers.

Disadvantages

• Limited temperature measurement range compared to some other temperature sensors.
• ±2°C accuracy may not be sufficient for highly precise temperature-sensitive applications.

Working Principles

The LM81CIMTX-3/NOPB utilizes internal circuitry to measure temperature accurately. It employs a diode-connected transistor to sense the temperature, which is then converted into a digital value using an analog-to-digital converter (ADC). The digital output is accessible through the I2C/SMBus interface.

In terms of system monitoring, the LM81CIMTX-3/NOPB uses dedicated circuitry to monitor system voltage, fan speed, and remote diode temperature. These parameters are continuously measured and can be accessed through the digital interface.

Application Field Plans

The LM81CIMTX-3/NOPB finds applications in various fields, including but not limited to:

1. Computer Systems: It can be used to monitor temperature and system parameters in desktop computers, laptops, servers, and other computing devices.

2. Industrial Equipment: The IC is suitable for monitoring temperature and system parameters in industrial machinery, power supplies, and control systems.

3. Automotive Electronics: It can be utilized in automotive applications to monitor temperature and critical system parameters, ensuring optimal performance and safety.

4. Consumer Electronics: The LM81CIMTX-3/NOPB can be integrated into consumer electronics such as home appliances, audio/video equipment, and gaming consoles to monitor temperature and enhance system reliability.

Alternative Models

1. LM75A: This temperature sensor IC offers similar functionality but with a wider temperature measurement range (-55°C to +125°C) and higher accuracy (±0.5°C).

2. TMP102: Another alternative, the TMP102, provides high accuracy (±0.5°C) temperature measurements and features a small package size.

3. MAX31725: This IC combines temperature sensing and system monitoring capabilities, offering additional features such as programmable temperature limits and extended temperature range (-55°C to +125°C).

In conclusion, the LM81CIMTX-3