Overview
The LM95214CISD is a high-precision digital temperature sensor manufactured by National Semiconductor, now part of Texas Instruments. This 11-bit sensor features a 2-wire System Management Bus (SMBus) interface, enabling accurate temperature monitoring of up to four remote diode-connected transistors and its own local temperature. Designed for applications requiring precise thermal management, the LM95214CISD is ideal for use in systems such as microprocessors, GPUs, and other high-performance computing devices. Its market positioning targets industries like consumer electronics, automotive, and industrial automation, where reliable temperature sensing is critical.
Key Specifications
| Parameter | Value | Unit | Notes |
|---|---|---|---|
| Temperature Range (Local) | -128 to +127.875 | °C | |
| Temperature Range (Remote) | 0 to 255 | °C | |
| Local Temperature Accuracy | ±2.0 | °C | Maximum |
| Remote Temperature Accuracy | ±1.1 | °C | Maximum |
| Supply Voltage | 3.0 to 3.6 | V | |
| Average Supply Current (1Hz Conversion Rate) | 0.57 | mA | |
| Interface | 2-wire SMBus | ||
| Package | 14-WSON |
Key Features
- Accurate monitoring of up to four remote diode-connected transistors and local temperature.
- Programmable TCRIT outputs for system shutdown, fan control, or microcontroller interrupts.
- Digital filters and fault queue for minimizing false TCRIT events.
- Offset correction registers for enhanced accuracy.
- Three-level address pin for connecting up to three devices on the same SMBus.
- Low power consumption with programmable conversion rate and shutdown mode.
Applications
The LM95214CISD is widely used in applications requiring precise temperature monitoring and thermal management. Key application areas include:
- Consumer Electronics: Monitoring temperatures in CPUs, GPUs, and other high-performance components to prevent overheating.
- Automotive: Ensuring thermal stability in engine control units (ECUs) and infotainment systems.
- Industrial Automation: Maintaining optimal operating temperatures in industrial machinery and control systems.
- Data Centers: Managing thermal conditions in servers and networking equipment to enhance reliability and longevity.
Q & A
1. What is the temperature range of the LM95214CISD?
The LM95214CISD supports a local temperature range of -128°C to +127.875°C and a remote temperature range of 0°C to 255°C.
2. How accurate is the temperature measurement?
The local temperature accuracy is ±2.0°C (maximum), while the remote temperature accuracy is ±1.1°C (maximum).
3. What is the supply voltage range?
The supply voltage ranges from 3.0V to 3.6V.
4. Can multiple LM95214CISD devices be connected to the same SMBus?
Yes, up to three devices can be connected using the three-level address pin.
5. What are TCRIT outputs used for?
TCRIT outputs can trigger system shutdown, activate fans, or generate microcontroller interrupts when temperature limits are exceeded.
6. Does the LM95214CISD support offset correction?
Yes, each channel includes registers for offset correction to improve accuracy.
7. What is the package type of the LM95214CISD?
The device is available in a 14-WSON package.
8. How does the LM95214CISD minimize false TCRIT events?
It uses digital filters and a fault queue to reduce false triggers from temperature spikes.
9. What is the average supply current at a 1Hz conversion rate?
The average supply current is 0.57mA.
10. Is the LM95214CISD suitable for automotive applications?
Yes, it is ideal for automotive systems requiring reliable temperature monitoring and thermal management.
