Overview
The LM86CIM/NOPB, produced by Texas Instruments, is an advanced digital temperature sensor designed to accurately measure both local and remote temperatures. This 11-bit digital temperature sensor features a 2-wire System Management Bus (SMBus) serial interface, enabling efficient communication and control. Although the LM86CIM/NOPB is no longer in production, it remains a significant component in legacy systems and designs. It is particularly useful for monitoring the temperature of external devices such as processor thermal diodes or diode-connected transistors, making it a versatile tool in various electronic systems.
Key Specifications
| Parameter | Value |
|---|---|
| Package | SOIC (D) with 8 pins |
| Operating Temperature Range (°C) | 0 to 125 |
| Supply Voltage | 3.0V to 3.6V |
| Supply Current | 0.8mA (typ) |
| Local Temperature Accuracy (includes quantization error) | ±3.0°C (max) at 25°C to 125°C |
| Remote Diode Temperature Accuracy (includes quantization error) | ±0.75°C (max) at 30°C, 80°C; ±1.0°C (max) at 30°C to 50°C, 60°C to 100°C; ±3.0°C (max) at 0°C to 85°C, 25°C to 125°C |
Key Features
- Accurately senses die temperature of remote ICs or diode junctions
- Offset register allows sensing a variety of thermal diodes accurately
- On-board local temperature sensing
- 10-bit plus sign remote diode temperature data format, 0.125°C resolution
- T_CRIT_A output useful for system shutdown
- ALERT output supports SMBus 2.0 protocol
- SMBus 2.0 compatible interface, supports TIMEOUT
- Available in 8-pin VSSOP and SOIC packages
Applications
The LM86CIM/NOPB is widely used in various applications requiring precise temperature monitoring, such as:
- Server and data center cooling systems
- High-performance computing systems
- Telecommunication equipment
- Aerospace and industrial control systems
- Automotive systems requiring temperature monitoring
Q & A
- What is the primary function of the LM86CIM/NOPB?
The primary function is to accurately measure both local and remote temperatures using a 2-wire SMBus serial interface. - What is the operating temperature range of the LM86CIM/NOPB?
The operating temperature range is from 0°C to 125°C. - What is the supply voltage range for the LM86CIM/NOPB?
The supply voltage range is from 3.0V to 3.6V. - What is the typical supply current of the LM86CIM/NOPB?
The typical supply current is 0.8mA. - How accurate is the remote diode temperature sensing of the LM86CIM/NOPB?
The remote diode temperature accuracy is ±0.75°C under specific conditions and up to ±3.0°C in other temperature ranges. - What is the purpose of the ALERT output in the LM86CIM/NOPB?
The ALERT output is activated when any temperature goes outside a preprogrammed window or exceeds the T_CRIT temperature limit. - Is the LM86CIM/NOPB compatible with other temperature sensors?
Yes, it is pin and register compatible with the Analog Devices ADM1032 and Maxim MAX6657/8. - What is the resolution of the remote diode temperature data format?
The resolution is 0.125°C in a 10-bit plus sign format. - Why is the Offset register important in the LM86CIM/NOPB?
The Offset register allows for accurate sensing of various thermal diodes without continuous software management. - Is the LM86CIM/NOPB still in production?
No, the LM86CIM/NOPB is no longer in production, and new designs should consider an alternate product.
