Overview
The NCT218MTR2G, produced by onsemi, is a dual-channel digital thermometer and under/overtemperature alarm designed for thermal management systems. It operates with low power and size requirements, making it suitable for a wide range of applications, including low-power devices. The device supports a supply voltage range of 1.4 V to 2.75 V and operates over a temperature range of −40°C to +125°C. It features an I2C interface for communication and configuration, allowing users to read temperature values, set limits, and control the device's operation.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Supply Voltage (VDD) | 1.4 to 2.75 | V |
| Operating Temperature Range | −40 to +125 | °C |
| Temperature Measurement Accuracy | ±1°C (Local), ±1.75°C (Remote) | °C |
| Quiescent Current | 44 μA (Normal Mode), 20 μA (Shutdown Mode) | μA |
| Series Resistance Cancellation | Up to 500 Ω (typical) | Ω |
| Communication Interface | I2C | |
| Package Type | DFN |
Key Features
- Small DFN package
- On-chip and remote temperature sensing
- Low voltage operation: 1.4 V to 2.75 V
- Low quiescent current: 44 μA (Normal Mode), 20 μA (Shutdown Mode)
- Power-saving shutdown mode
- Series resistance cancellation up to 500 Ω
- 2-wire I2C serial interface
- Configurable ALERT and THERM outputs
- Digital filtering for noise reduction
Applications
The NCT218MTR2G is suitable for various thermal management applications, including:
- Server and data center cooling systems
- Automotive electronics
- Industrial control systems
- Consumer electronics requiring precise temperature monitoring
- Low-power devices and battery-operated systems
Q & A
- What is the operating voltage range of the NCT218MTR2G?
The NCT218MTR2G operates over a supply voltage range of 1.4 V to 2.75 V. - What is the accuracy of the temperature measurements?
The device measures local temperature with an accuracy of ±1°C and remote temperature with an accuracy of ±1.75°C. - What is the operating temperature range of the NCT218MTR2G?
The device operates over a temperature range of −40°C to +125°C. - How does the series resistance cancellation work?
The NCT218MTR2G can automatically cancel the effect of up to 500 Ω of series resistance in the remote temperature sensor, improving measurement accuracy. - What communication interface does the NCT218MTR2G use?
The device uses a 2-wire I2C serial interface for communication and configuration. - Can the ALERT and THERM outputs be configured?
Yes, the ALERT output can be reconfigured as a second THERM output if required. - How does the device handle noise in temperature measurements?
The device performs digital filtering by averaging the results of 16 measurement cycles for low conversion rates to reduce noise. - What is the purpose of the configuration register?
The configuration register allows users to set various parameters such as the temperature measurement range, ALERT output masking, and device operation mode. - How many registers does the NCT218MTR2G have?
The device contains 22, 8-bit registers for storing temperature measurements, limits, and configuration data. - What is the function of the status register?
The status register provides information on the device's status, including out-of-limit temperature measurements and remote sensor open circuit conditions.
