Overview
The LM95234CISDX from Texas Instruments is a highly advanced quad remote diode and local temperature sensor. This device features a 2-wire System Management Bus (SMBus) interface, enabling precise monitoring of the temperature of four remote diodes as well as its own local temperature. The LM95234 incorporates TruTherm BJT beta compensation technology, which allows for accurate sensing of thermal diodes in sub-micron processes, such as those found in Intel processors on 90 nm or 65 nm processes. This sensor is designed for applications requiring high accuracy and flexibility in temperature monitoring.
Key Specifications
| Parameter | Value | Units |
|---|---|---|
| Local Temperature Accuracy | ±2.0°C (max) | °C |
| Remote Diode Temperature Accuracy | ±0.875°C (max) | °C |
| Supply Voltage | 3.0V to 3.6V | V |
| Average Supply Current (1Hz conversion rate) | Typically 0.5 mA | mA |
| Operating Temperature Range | −40°C to +125°C | °C |
| Temperature Resolution | 0.125°C LSb (local), 0.03125°C LSb (remote with digital filter) | °C |
| Remote Temperature Ranges | +127.875°C/–128°C and 0°C/255°C | °C |
| Package | 14-pin WSON |
Key Features
- 11-bit digital temperature sensor with SMBus interface
- TruTherm BJT beta compensation technology for accurate sub-micron process thermal diode sensing
- Programmable digital filters and analog front-end filter for improved noise immunity
- Remote diode fault detection and model selection
- Three programmable TCRIT outputs with shared hysteresis and fault-queue
- Programmable conversion rate and shutdown mode for power savings
- Three-level address pin allowing connection of up to 3 devices to the same SMBus master
- Mask and status registers for detailed control and monitoring
Applications
- Processor and computer system thermal management
- Electronic test equipment
- Office electronics
- Server and workstation thermal monitoring
- Laptop and desktop thermal management
Q & A
- What is the LM95234CISDX used for? The LM95234CISDX is used for precise monitoring of the temperature of four remote diodes and its own local temperature, particularly in applications requiring high accuracy such as processor and computer system thermal management.
- What technology does the LM95234CISDX use for temperature sensing? The LM95234CISDX uses TruTherm BJT beta compensation technology for accurate sensing of thermal diodes in sub-micron processes.
- What is the temperature resolution of the LM95234CISDX? The local temperature resolution is 0.125°C, and the remote temperature resolution can be as low as 0.03125°C with the digital filter enabled.
- What is the operating temperature range of the LM95234CISDX? The operating temperature range is −40°C to +125°C.
- How many devices can be connected to the same SMBus master using the LM95234CISDX? Up to 3 devices can be connected using the three-level address pin.
- What are the programmable TCRIT outputs used for? The TCRIT outputs are triggered when any unmasked channel exceeds its corresponding programmable limit and can be used for system shutdown, turning on system fans, or as a microcontroller interrupt function.
- How does the LM95234CISDX manage power consumption? The device includes programmable conversion rate, shutdown mode, and the ability to disable unused channels to reduce power consumption.
- What types of remote diodes can the LM95234CISDX monitor? The LM95234CISDX can monitor thermal diodes of Intel processors on 65 nm or 90 nm processes, as well as diode-connected 2N3904 transistors.
- Does the LM95234CISDX support fault detection for remote diodes? Yes, the LM95234CISDX includes diode fault detection circuitry to detect the absence or fault state of a remote diode.
- What interface does the LM95234CISDX use for communication? The LM95234CISDX uses a 2-wire SMBus interface for communication.
