Overview
The LM63DIMAX/NOPB is a remote diode temperature sensor with integrated fan control, manufactured by Texas Instruments. This device is designed to accurately measure the temperature of a diode-connected transistor, such as those found in computer processors, graphics processor units (GPUs), and other ASICs. The LM63 also measures its own local temperature and features a pulse-width-modulated (PWM) fan control output to regulate fan speed based on temperature readings.
Key Specifications
| Parameter | Conditions | Typical | Limits |
|---|---|---|---|
| Remote Diode Temp Accuracy | 30 to 50°C, 60 to 100°C | ±1.0°C (LM63C), ±3.0°C (LM63D) | ±1.0°C (LM63C), ±3.0°C (LM63D) |
| Local Temp Accuracy | 25°C to 125°C | ±3.0°C | ±3.0°C |
| Supply Voltage | 3.0 V to 3.6 V | 3.0 V to 3.6 V | |
| Supply Current | 1.3 mA (typ) | ||
| Resolution | 10-bit plus sign for remote diode, 8-bit for local diode | 0.125°C for remote diode, 1°C for local diode | |
| Conversion Time | 31.25 ms (max) | 31.25 ms (max) | |
| Package | SOIC-8 | ||
| Operating Temperature Range | 0°C to +85°C | 0°C to +85°C |
Key Features
- Accurately senses the temperature of diode-connected transistors or thermal diodes on processors, GPUs, and ASICs.
- Factory trimmed for Intel® Pentium® 4 and Mobile Pentium 4 Processor-M thermal diodes.
- Integrated PWM fan speed control output with user-programmable 8-step lookup table for acoustic fan noise reduction.
- Multi-function, user-selectable pin for either ALERT output or tachometer input.
- Tachometer input for measuring fan RPM with smart-tach modes.
- SMBus 2.0 compatible interface.
- LM86-compatible pinout and register set.
- Offset register to adjust for various thermal diodes.
Applications
The LM63DIMAX/NOPB is suitable for various applications requiring precise temperature monitoring and fan control, including:
- Computer systems, especially those with Intel® Pentium® 4 and Mobile Pentium 4 processors.
- Graphics processing units (GPUs) and other high-power ASICs.
- Server and data center cooling systems.
- Industrial automation and control systems.
- High-performance computing environments.
Q & A
- What is the primary function of the LM63DIMAX/NOPB? The primary function is to accurately measure the temperature of remote diodes and control fan speed using PWM output.
- What types of diodes can the LM63DIMAX/NOPB measure? It can measure diode-connected transistors or thermal diodes commonly found on processors, GPUs, and ASICs.
- What is the accuracy of the remote diode temperature measurement? The accuracy is ±1.0°C for the LM63C version and ±3.0°C for the LM63D version.
- What is the supply voltage range for the LM63DIMAX/NOPB? The supply voltage range is 3.0 V to 3.6 V.
- Does the LM63DIMAX/NOPB support SMBus interface? Yes, it is compatible with SMBus Specification 2.0.
- How does the LM63DIMAX/NOPB control fan speed? It uses a PWM output with a user-programmable 8-step lookup table to control fan speed based on temperature readings.
- Can the LM63DIMAX/NOPB measure fan RPM? Yes, it has a tachometer input to measure fan RPM and includes smart-tach modes.
- What is the package type of the LM63DIMAX/NOPB? It comes in an SOIC-8 package.
- What is the operating temperature range of the LM63DIMAX/NOPB? The operating temperature range is 0°C to +85°C.
- Does the LM63DIMAX/NOPB have an ALERT function? Yes, it has an ALERT output that can be triggered when the measured temperature exceeds certain programmed limits.
