Overview
The LM96163CISDX/NOPB is a remote diode digital temperature sensor with integrated fan control, manufactured by Texas Instruments. This device is designed to accurately measure temperatures using remote and local temperature sensors, and it includes advanced features such as TruTherm BJT transistor beta compensation technology. The LM96163 is particularly suited for monitoring temperatures in computer processors, graphics processor units (GPUs), and other ASICs, especially those fabricated in 45nm, 65nm, and 90nm processes.
Key Specifications
| Parameter | Conditions | Typical | Limits |
|---|---|---|---|
| Remote Temp Accuracy | +25°C to +85°C | ±0.75°C | ±0.75°C (max) |
| Remote Temp Accuracy | +40°C to +125°C | ±1.5°C | ±1.5°C (max) |
| Remote Temp Accuracy | +25°C to +125°C | ±3.0°C | ±3.0°C (max) |
| Local Temp Accuracy | +25°C to +125°C | ±1°C | ±3.0°C (max) |
| Supply Voltage | +3.0 V to +3.6 V | ||
| Supply Current (0.8Hz Conversion) | 456 µA (typ) | ||
| PWM Fan Speed Control Frequency | 22.5 kHz | ||
| Tachometer Input Accuracy | ±7% (max) |
Key Features
- TruTherm BJT Transistor Beta Compensation Technology: Allows for precise temperature sensing of remote diodes in sub-micron processes.
- Integrated PWM Fan Speed Control: Includes a 12-step lookup table (LUT) for programming a non-linear fan speed vs. temperature transfer function, and a smoothing function for gradual transitions between LUT setpoints.
- Remote and Local Temperature Sensing: Accurately measures its own temperature and the temperature of a diode-connected transistor or thermal diode.
- Tachometer Input: Measures the speed of fans using pulses from a 3 or 4-pin fan’s tachometer output, with smart-tach measurement mode for corrupted tachometer pulses.
- ALERT and TCRIT Outputs: Provides open-drain outputs for temperature event notifications and critical temperature system shutdown.
- SMBus Compatibility: Two-wire interface compatible with SMBus Specification 2.0.
- Low Power Standby Mode: Stops continuous conversions and allows optional PWM output continuation.
- Digital Filter and High Resolution: Increases resolution to 1/32°C when the digital filter is enabled.
Applications
- Computer Processors and GPUs: Ideal for monitoring temperatures in central processing units (CPUs) and graphics processing units (GPUs).
- ASICs and Other High-Density ICs: Suitable for temperature monitoring in application-specific integrated circuits (ASICs) and other high-density integrated circuits.
- Server and Data Center Cooling Systems: Used in cooling systems to optimize fan speed and reduce acoustic noise.
- Embedded Systems and Industrial Control: Applied in various embedded systems and industrial control environments requiring precise temperature monitoring and fan control.
Q & A
- What is the primary function of the LM96163CISDX/NOPB?
The primary function is to accurately measure temperatures using remote and local temperature sensors and to control fan speed based on these measurements.
- What is TruTherm BJT transistor beta compensation technology?
This technology allows for precise temperature sensing of remote diodes in sub-micron processes by compensating for BJT transistor beta variations.
- What is the range of the supply voltage for the LM96163CISDX/NOPB?
The supply voltage range is from +3.0 V to +3.6 V.
- How does the LM96163CISDX/NOPB control fan speed?
The device controls fan speed using a pulse-width modulated (PWM) output driven by a 12-step temperature to duty cycle lookup table (LUT).
- What is the purpose of the ALERT and TCRIT outputs?
The ALERT output notifies of temperature events, and the TCRIT output is used for critical temperature system shutdown.
- Is the LM96163CISDX/NOPB compatible with SMBus?
Yes, it has a two-wire interface compatible with SMBus Specification 2.0.
- How does the LM96163CISDX/NOPB measure fan speed?
The device measures fan speed using the pulses from a 3 or 4-pin fan’s tachometer output, with a smart-tach measurement mode for corrupted pulses.
- What is the resolution of the temperature readings when the digital filter is enabled?
The resolution increases to 1/32°C when the digital filter is enabled.
- Can the LM96163CISDX/NOPB be placed in a low power standby mode?
Yes, the device can be placed in a low power standby mode by setting the Standby bit in the Configuration Register.
- What are some common applications of the LM96163CISDX/NOPB?
Common applications include monitoring temperatures in CPUs, GPUs, ASICs, server and data center cooling systems, and various embedded systems.
