Overview
The LM95234CISD/NOPB 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 and incorporates TruTherm™ BJT beta compensation technology, enabling accurate temperature sensing of sub-micron process thermal diodes, including those in Intel processors (90 nm or 65 nm) and diode-connected 2N3904 transistors. The LM95234 can monitor the temperature of up to four remote diodes and its own local temperature, making it an essential component for thermal management in various electronic systems.
Key Specifications
| Specification | Value |
|---|---|
| Local Temperature Accuracy | ±2.0°C (max) |
| Remote Diode Temperature Accuracy | ±0.875°C (max) |
| Supply Voltage | 3.0V to 3.6V |
| Average Supply Current (1Hz conversion rate) | 570 μA |
| Resolution | 0.125°C LSb (local), 0.03125°C LSb (remote with digital filter) |
| Temperature Ranges | +127.875°C/–128°C and 0°C/255°C |
| Interface | 2-wire SMBus 2.0 compatible |
| Package | 14-pin WSON (WFDFN Exposed Pad) |
| Operating Temperature | -40°C to 140°C |
| Number of Channels | 4 remote diodes + 1 local temperature channel |
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, increasing resolution to 0.03125°C.
- Remote diode fault detection, model selection, and offset correction.
- 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 LM95234s to the same SMBus master.
- SMBus 2.0 compatible interface with support for TIMEOUT.
- Mask and status register support for detailed control and monitoring.
Applications
- Processor/Computer System Thermal Management (laptops, desktops, workstations, servers).
- Electronic Test Equipment.
- Office Electronics.
- Any system requiring precise temperature monitoring of multiple remote and local points.
Q & A
- What is the primary function of the LM95234CISD/NOPB?
The LM95234CISD/NOPB is a quad remote diode and local temperature sensor that accurately monitors the temperature of up to four remote diodes and its own local temperature.
- What technology does the LM95234CISD/NOPB use for temperature sensing?
The LM95234CISD/NOPB uses TruTherm BJT beta compensation technology for accurate temperature sensing.
- What is the resolution of the temperature readings?
The resolution is 0.125°C for local temperature and 0.03125°C for remote diodes with digital filters enabled.
- What are the temperature ranges supported by the LM95234CISD/NOPB?
The device supports temperature ranges of +127.875°C/–128°C and 0°C/255°C.
- What interface does the LM95234CISD/NOPB use?
The device uses a 2-wire SMBus 2.0 compatible interface.
- How many devices can be connected to the same SMBus master?
Up to 3 LM95234s can be connected to the same SMBus master using the three-level address pin.
- What power-saving features does the LM95234CISD/NOPB have?
The device includes programmable conversion rate, shutdown mode, and the ability to disable unused channels for power savings.
- What is the operating temperature range of the LM95234CISD/NOPB?
The operating temperature range is -40°C to 140°C.
- What kind of packaging does the LM95234CISD/NOPB come in?
The device comes in a 14-pin WSON (WFDFN Exposed Pad) package.
- Is the LM95234CISD/NOPB RoHS compliant?
Yes, the LM95234CISD/NOPB is RoHS compliant.
