Overview
The NCT72CMTR2G, manufactured by onsemi, is a dual-channel digital thermometer and undertemperature/overtemperature alarm. It is designed for use in PCs and thermal management systems, offering compatibility with the NCT1008 but with enhanced features. The device allows for the measurement of both on-chip and remote temperatures, with an accuracy of ±1°C for remote temperatures and ±3°C for ambient temperatures. It features a switchable temperature measurement range of 0°C to +127°C (default) or -64°C to +191°C. The NCT72 communicates via a 2-wire SMBus/I2C serial interface and includes a configurable ALERT output and up to two overtemperature fail-safe THERM outputs.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Temperature Measurement Range | 0°C to +127°C (default) or -64°C to +191°C | °C |
| Remote Diode Sensor Accuracy | ±1°C | °C |
| Local Temperature Sensor Accuracy | ±3°C | °C |
| Resolution | 0.25°C (remote), 1°C (local) | °C |
| Series Resistance Cancellation | Up to 1.5 kΩ | kΩ |
| Operating Current | 240 µA | µA |
| Standby Current | 5 µA | µA |
| Supply Voltage (VDD) | 2.8 V to 3.6 V | V |
| SMBus/I2C Address | 0x4C (default), 0x4D (NCT72D) | - |
| Package Type | 8-lead DFN | - |
Key Features
- On-chip and remote temperature sensor with high accuracy
- Extended, switchable temperature measurement range (0°C to +127°C or -64°C to +191°C)
- Series resistance cancellation up to 1.5 kΩ
- Pin and register compatible with NCT1008
- Configurable ALERT output and up to two overtemperature fail-safe THERM outputs
- 2-wire SMBus/I2C serial interface with SMBus alert support
- Programmable over/undertemperature limits and offset registers for system calibration
- Low operating current (240 µA) and standby current (5 µA)
- Compatible with 1.8 V logic
Applications
- Notebook and desktop computers
- Game consoles
- LCD TVs
- Occupancy sensors
- DSL line cards
- Dishwashers
- Refrigerators
- Vacuum cleaners
- Induction cookers
- RFID readers
- Smart phones and smart batteries
- Automotive and embedded systems
Q & A
- What is the primary function of the NCT72CMTR2G?
The NCT72CMTR2G is a dual-channel digital thermometer and undertemperature/overtemperature alarm designed for thermal management in various applications.
- What are the temperature measurement ranges of the NCT72CMTR2G?
The device can measure temperatures in two ranges: 0°C to +127°C (default) and -64°C to +191°C.
- How accurate is the temperature measurement of the NCT72CMTR2G?
The device measures remote temperatures with an accuracy of ±1°C and ambient temperatures with an accuracy of ±3°C.
- What is the series resistance cancellation feature of the NCT72CMTR2G?
The device can automatically cancel up to 1.5 kΩ of series resistance in the temperature monitoring diode, allowing for noise filtering.
- How does the NCT72CMTR2G communicate with other devices?
The device communicates via a 2-wire SMBus/I2C serial interface.
- What are the power consumption characteristics of the NCT72CMTR2G?
The device operates at 240 µA and has a standby current of 5 µA.
- Is the NCT72CMTR2G compatible with other onsemi products?
Yes, it is pin and register compatible with the NCT1008.
- What are the typical applications of the NCT72CMTR2G?
It is used in notebook and desktop computers, game consoles, LCD TVs, occupancy sensors, and various other consumer and industrial devices.
- How many SMBus/I2C addresses are available for the NCT72CMTR2G?
The device has two SMBus/I2C addresses: 0x4C (default) and 0x4D (NCT72D).
- What is the package type of the NCT72CMTR2G?
The device is available in an 8-lead DFN package.
