Overview
The NCT1008, produced by onsemi, is a dual-channel digital thermometer designed for precise temperature monitoring and over/under temperature alarm functions. It is particularly suited for use in PCs, thermal management systems, smart phones, desktop and notebook computers, smart batteries, automotive systems, and embedded systems. The device features series resistance cancellation, allowing accurate temperature measurements even with up to 1.5 kΩ of series resistance. It communicates via a 2-wire SMBus/I2C interface and supports extended temperature measurement ranges.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Voltage (VDD) | 2.8 | 3.30 | 3.6 | V |
| Operating Supply Current (IDD) | - | 240 | 350 | μA |
| Standby Mode Current | - | 5.0 | 30 | μA |
| Local Temperature Sensor Accuracy | - | - | ±3°C | - |
| Remote Temperature Sensor Accuracy | - | - | ±1°C | - |
| Temperature Measurement Range (Default) | 0°C | - | +127°C | - |
| Extended Temperature Measurement Range | -64°C | - | +191°C | - |
| Series Resistance Cancellation | - | 1.5 kΩ | - | - |
| SMBus/I2C Clock Frequency | - | - | 400 kHz | - |
| Maximum Junction Temperature (TJ MAX) | - | - | 150 °C | - |
| Storage Temperature Range | -65 °C | - | +150 °C | - |
Key Features
- On-chip and remote temperature sensing with 0.25°C resolution and ±1°C accuracy on the remote channel, and 1°C resolution and ±1°C accuracy on the local channel.
- Series resistance cancellation up to 1.5 kΩ.
- Extended, switchable temperature measurement range from 0°C to +127°C (default) or –64°C to +191°C.
- Register-compatible with ADM1032 and ADT7461.
- 2-wire SMBus/I2C serial interface with SMBus alert support.
- Programmable over/under temperature limits.
- Offset registers for system calibration.
- Up to two overtemperature fail-safe THERM outputs.
- Small 8-lead DFN package.
- Low operating current of 240 μA and standby current of 5 μA.
- Compatible with 1.8 V logic.
- Pb-free packages available.
Applications
- Smart Phones
- Desktop and Notebook Computers
- Smart Batteries
- Automotive Systems
- Embedded Systems
Q & A
- What is the primary function of the NCT1008? The NCT1008 is a dual-channel digital thermometer and undertemperature/overtemperature alarm.
- What is the accuracy of the remote temperature sensor? The remote temperature sensor has an accuracy of ±1°C.
- What is the default temperature measurement range of the NCT1008? The default temperature measurement range is from 0°C to +127°C.
- Can the temperature measurement range be extended? Yes, the range can be switched to –64°C to +191°C.
- How does the NCT1008 communicate? It communicates via a 2-wire SMBus/I2C interface.
- What is the maximum series resistance that can be cancelled by the NCT1008? The NCT1008 can cancel up to 1.5 kΩ of series resistance.
- What are the typical operating and standby currents of the NCT1008? The typical operating current is 240 μA, and the standby current is 5 μA.
- Is the NCT1008 compatible with 1.8 V logic? Yes, it is compatible with 1.8 V logic.
- What are some common applications of the NCT1008? Common applications include smart phones, desktop and notebook computers, smart batteries, automotive systems, and embedded systems.
- Does the NCT1008 support Pb-free packages? Yes, Pb-free packages are available.
