Overview
The NCT75DMR2G is a two-wire serially programmable temperature sensor produced by onsemi. It features a high-resolution 12-bit sigma-delta analog-to-digital converter (ADC) that converts temperature measurements into digital form. The device operates over a wide temperature range of -55°C to +125°C and is compatible with industry-standard SMBus/I2C protocols. The NCT75DMR2G includes an overtemperature/interrupt output pin that can signal out-of-limit conditions and supports both comparator and interrupt modes. It is available in space-saving packages such as DFN-8, MSOP-8, and SOIC-8, and is fully pin and register compatible with the LM75 and TCN75.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Temperature Range | -55°C to +125°C | °C |
| ADC Resolution | 12 bits | Bits |
| Temperature Resolution | 0.0625°C | °C |
| Temperature Conversion Time (One-shot Mode) | 48.5 ms | ms |
| Update Rate | 80 ms | ms |
| Supply Voltage | 3.0 V to 5.5 V | V |
| Average Supply Current at 3.3 V | 575 µA | µA |
| Typical Shutdown Current | 3 µA | µA |
| Package Type | DFN-8, MSOP-8, SOIC-8 | |
| Serial Interface | SMBus/I2C |
Key Features
- 12-bit temperature-to-digital converter
- Input voltage range from 3.0 V to 5.5 V
- Temperature range from -55°C to +125°C
- SMBus/I2C interface
- Overtemperature indicator with support for SMBus/ALERT
- Shutdown mode for low power consumption
- One-shot mode for on-demand temperature conversions
- Available in 8-pin DFN, MSOP, and SOIC packages
- Pb-free, halogen-free/BFR-free, and RoHS compliant
Applications
- Computer thermal monitoring
- Thermal protection
- Isolated sensors
- Battery management
- Office electronics
- Electronic test equipment
- Thermostat controls
- System thermal management
- Notebook and desktop computers
- Game consoles
- Servers
- LCD TVs
- Refrigerators
- Dishwashers
- Induction cookers
- DSL line cards
- Graphics cards
- Occupancy sensors
- RFID readers
- Vacuum cleaners
Q & A
- What is the temperature range of the NCT75DMR2G?
The NCT75DMR2G operates over a temperature range of -55°C to +125°C.
- What is the resolution of the ADC in the NCT75DMR2G?
The ADC resolution is 12 bits, providing a temperature resolution of 0.0625°C.
- What is the typical supply current of the NCT75DMR2G at 3.3 V?
The average supply current at 3.3 V is 575 µA.
- What is the typical shutdown current of the NCT75DMR2G?
The typical shutdown current is 3 µA.
- What serial interface does the NCT75DMR2G use?
The NCT75DMR2G uses the SMBus/I2C interface.
- How many devices can be connected to a single bus using the address selection pins?
Up to 8 NCT75 devices can be connected to a single bus using the three address selection pins (A2, A1, A0).
- What is the purpose of the OS/ALERT pin?
The OS/ALERT pin can be used to signal out-of-limit conditions and can operate in either comparator or interrupt mode.
- What are the available package types for the NCT75DMR2G?
The NCT75DMR2G is available in DFN-8, MSOP-8, and SOIC-8 packages.
- Is the NCT75DMR2G RoHS compliant?
Yes, the NCT75DMR2G is Pb-free, halogen-free/BFR-free, and RoHS compliant.
- What are some common applications of the NCT75DMR2G?
Common applications include computer thermal monitoring, thermal protection, isolated sensors, battery management, and various consumer electronics.
