Overview
The LM95233CISD, produced by National Semiconductor (now part of Texas Instruments), is an advanced 11-bit digital temperature sensor. It features a 2-wire System Management Bus (SMBus) interface, enabling it to monitor the temperature of two remote diodes as well as its own local temperature. This device is particularly useful for accurately sensing the die temperature of external devices such as microprocessors, graphics processors, or diode-connected transistors like the 2N3904.
The LM95233CISD incorporates TruTherm™ BJT beta compensation technology, which allows for precise sensing of thermal diodes in sub-micron process technologies, including Intel processors on 65 nm and 90 nm processes. The device reports temperature in two different formats: +127.875°C/–128°C and 0°C/255°C ranges.
Key Specifications
| Parameter | Specification |
|---|---|
| Resolution | 11-bit, 0.125°C LSb (standard), 0.03125°C LSb with digital filter enabled |
| Local Temperature Accuracy | ±2.0 °C (max) |
| Remote Diode Temperature Accuracy | ±0.875 °C (max) |
| Supply Voltage | 3.0 to 3.6 V |
| Average Supply Current (1Hz conversion rate) | 0.57 mA (typ) |
| Operating Temperature Range | −40°C to +140°C |
| Interface | SMBus 2.0 Compatible, 2-wire |
| Package | 14-Pin WSON |
| Address Pin | Three-level address pin for up to 3 devices on the same SMBus master |
Key Features
- TruTherm™ BJT beta compensation technology for accurate sensing of sub-micron process thermal diodes.
- Programmable digital filters for Remote Diode 1 and 2 temperature readings to minimize unwanted TCRIT events.
- Remote diode fault detection circuitry to detect the absence or fault state of a remote diode.
- Three programmable TCRIT outputs with shared programmable hysteresis register.
- Programmable conversion rate and shutdown mode for power savings.
- Mask and status registers for further control of TCRIT outputs.
- SMBus 2.0 compatible interface with three-level address pin for multiple device connection.
Applications
- Processor/Computer System Thermal Management (e.g., Laptop, Desktop, Workstations, Server).
- Electronic Test Equipment.
- Office Electronics.
Q & A
- What is the LM95233CISD used for?
The LM95233CISD is used to monitor the temperature of two remote diodes and its own local temperature, making it suitable for thermal management in various electronic systems.
- What technology does the LM95233CISD use for temperature sensing?
The LM95233CISD uses TruTherm™ BJT beta compensation technology for accurate temperature sensing of sub-micron process thermal diodes.
- What is the resolution of the LM95233CISD?
The resolution is 11-bit, with a standard resolution of 0.125°C LSb and an enhanced resolution of 0.03125°C LSb with the digital filter enabled.
- What is the operating temperature range of the LM95233CISD?
The operating temperature range is −40°C to +140°C.
- How does the LM95233CISD communicate?
The LM95233CISD communicates via a 2-wire SMBus 2.0 compatible interface.
- What are the power-saving features of the LM95233CISD?
The device includes programmable conversion rate, shutdown mode, and the ability to turn off unused channels for power savings.
- Can the LM95233CISD detect faults in remote diodes?
Yes, the LM95233CISD includes remote diode fault detection circuitry to detect the absence or fault state of a remote diode.
- How many devices can be connected to the same SMBus master using the LM95233CISD?
Up to three devices can be connected using the three-level address pin.
- What are the typical applications of the LM95233CISD?
Typical applications include processor/computer system thermal management, electronic test equipment, and office electronics.
- What is the package type of the LM95233CISD?
The LM95233CISD comes in a 14-Pin WSON package.
