Overview
The LM95233CISD/NOPB, manufactured by Texas Instruments, is an advanced dual remote diode and local temperature sensor. This 11-bit digital temperature sensor features a 2-wire System Management Bus (SMBus) interface, enabling precise monitoring of the temperature of two remote diodes as well as its own local temperature. The device is particularly useful for monitoring the thermal conditions of external devices such as microprocessors, graphics processors, or diode-connected transistors like the 2N3904. The LM95233 incorporates TruTherm™ BJT beta compensation technology, which ensures accurate sensing of thermal diodes in sub-micron processes (90 nm or 65 nm).
Key Specifications
| Parameter | Value | Conditions |
|---|---|---|
| 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) | |
| Temperature Resolution | 0.125°C LSb (standard), 0.03125°C LSb (with digital filter) | |
| Operating Temperature Range | −40°C to +140°C | |
| SMBus Clock Frequency | 100 kHz (max), 10 kHz (min) | |
| Package Type | 14-Pin WSON |
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 and offset correction.
- Three programmable TCRIT outputs with shared hysteresis.
- SMBus 2.0 compatible interface.
- 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 further control of TCRIT outputs.
Applications
- Processor/Computer System Thermal Management (e.g., Laptop, Desktop, Workstations, Server).
- Electronic Test Equipment.
- Office Electronics.
Q & A
- What is the primary function of the LM95233CISD/NOPB?
The LM95233CISD/NOPB is a dual remote diode and local temperature sensor that monitors the temperature of two remote diodes and its own local temperature.
- What technology does the LM95233 use for accurate temperature sensing?
The LM95233 uses TruTherm™ BJT beta compensation technology for accurate sensing of sub-micron process thermal diodes.
- What is the temperature resolution of the LM95233?
The temperature resolution is 0.125°C LSb (standard) and can be increased to 0.03125°C LSb with the digital filter enabled.
- What is the operating temperature range of the LM95233?
The operating temperature range is −40°C to +140°C.
- How many devices can be connected to the same SMBus master using the LM95233?
Up to 3 devices can be connected to the same SMBus master using the three-level address pin.
- What power-saving features does the LM95233 offer?
The LM95233 offers programmable conversion rate, shutdown mode, and the ability to turn off unused channels for power savings.
- What types of applications is the LM95233 suitable for?
The LM95233 is suitable for processor/computer system thermal management, electronic test equipment, and office electronics.
- How does the LM95233 handle remote diode faults?
The LM95233 includes remote diode fault detection circuitry that can detect the absence or fault state of a remote diode.
- What is the purpose of the TCRIT outputs on the LM95233?
The TCRIT outputs are triggered when any unmasked channel exceeds its corresponding programmable limit and can be used to shutdown the system, turn on system fans, or as a microcontroller interrupt function.
- How can the status of the TCRIT pins be read?
The current status of the TCRIT pins can be read back from the status registers via the SMBus interface.
