LM94CIMTX/NOPB

Product Overview

Category: Integrated Circuit (IC)

Use: Temperature Sensor and Digital Thermal Watchdog

Characteristics: - Measures temperature with high accuracy - Provides thermal protection for electronic devices - Monitors and alerts on over-temperature conditions - Offers digital output for easy integration - Low power consumption

Package: Small Outline Transistor (SOT-23)

Essence: The LM94CIMTX/NOPB is a temperature sensor and digital thermal watchdog IC designed to accurately measure temperature and provide thermal protection for electronic devices.

Packaging/Quantity: The LM94CIMTX/NOPB is available in a small outline transistor package and is typically sold in reels of 3000 units.

Specifications

• Temperature Range: -40°C to +125°C
• Accuracy: ±1.5°C (max) from -10°C to +85°C
• Supply Voltage: 2.7V to 5.5V
• Quiescent Current: 50µA (typ)
• Digital Output: I2C/SMBus compatible
• Resolution: 11 bits
• Alert Function: Programmable temperature limits with hysteresis
• Shutdown Mode: Low-power standby mode

Detailed Pin Configuration

The LM94CIMTX/NOPB has the following pin configuration:

____ VDD |1 6| GND SDA |2 5| ALERT SCL |3 4| NC ------

1. VDD: Power supply input
2. SDA: Serial data input/output for I2C communication
3. SCL: Serial clock input for I2C communication
4. NC: No connection
5. ALERT: Open-drain output for alert indication
6. GND: Ground reference

Functional Features

1. Temperature Measurement: The LM94CIMTX/NOPB accurately measures temperature within the specified range.
2. Thermal Protection: It provides thermal protection by monitoring the temperature and generating an alert when it exceeds programmable limits.
3. Digital Output: The IC communicates using the I2C/SMBus protocol, allowing easy integration with microcontrollers and other devices.
4. Low Power Consumption: The LM94CIMTX/NOPB operates with low quiescent current, minimizing power consumption in battery-powered applications.

Advantages and Disadvantages

Advantages: - High accuracy temperature measurement - Programmable temperature limits for thermal protection - Easy integration with digital output - Low power consumption

Disadvantages: - Limited temperature range (-40°C to +125°C) - Requires external microcontroller or host device for full functionality

Working Principles

The LM94CIMTX/NOPB utilizes a built-in temperature sensor to measure the ambient temperature. It converts the analog temperature reading into a digital value using an internal ADC. The digital temperature data is then communicated through the I2C/SMBus interface.

The IC continuously monitors the temperature and compares it to the programmed temperature limits. If the temperature exceeds the set limits, the ALERT pin is activated, indicating an over-temperature condition. This feature enables the LM94CIMTX/NOPB to provide thermal protection for electronic devices.

Detailed Application Field Plans

The LM94CIMTX/NOPB finds applications in various fields, including:

1. Consumer Electronics: Temperature monitoring and protection in smartphones, tablets, laptops, and gaming consoles.
2. Industrial Automation: Thermal management in industrial control systems, motor drives, and power supplies.
3. Automotive: Over-temperature detection in automotive electronics, such as engine control units (ECUs) and infotainment systems.
4. Medical Devices: Temperature sensing and protection in medical equipment, including patient monitors and diagnostic devices.

Detailed and Complete Alternative Models

1. LM75A: Digital temperature sensor with I2C interface and ±2°C accuracy.
2. TMP102: Low-power digital temperature sensor with I2C interface and ±0.5°C accuracy.
3. DS18B20: Programmable 1-Wire digital thermometer with ±0.5°C accuracy and unique device address.

These alternative models offer similar functionality to the LM94CIMTX/NOPB and can be considered based on specific application requirements.

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