Overview
The LM86CIMX/NOPB from Texas Instruments is an advanced digital temperature sensor designed to accurately measure both local and remote temperatures. This 11-bit temperature sensor features a 2-wire System Management Bus (SMBus) serial interface, enabling efficient communication and control. The LM86 can measure its own temperature as well as the temperature of external devices, such as processor thermal diodes or diodes connected to transistors like the 2N3904. It is particularly useful in applications requiring precise temperature monitoring and management.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Supply Voltage | 3.0V to 3.6V | V |
| Supply Current | 0.8mA (typ) | mA |
| Local Temperature Accuracy (includes quantization error) | ±3.0°C (max) at TA = 25°C to 125°C | °C |
| Remote Diode Temperature Accuracy (includes quantization error) | ±0.75°C (max) at TA = 30°C, TD = 80°C | °C |
| Remote Diode Temperature Accuracy (includes quantization error) | ±1.0°C (max) at TA = 30°C to 50°C, TD = 60°C to 100°C | °C |
| Remote Diode Temperature Accuracy (includes quantization error) | ±3.0°C (max) at TA = 0°C to 85°C, TD = 25°C to 125°C | °C |
| Resolution | 0.125°C | °C |
| Package | 8-Pin VSSOP and SOIC | |
| SMBus Clock Frequency | 100 kHz (max), 10 kHz (min) | kHz |
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 with 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.
- Low power consumption mode (Shutdown) by setting the RUN/STOP bit.
- Pin and register compatible with Analog Devices ADM1032 and Maxim MAX6657/8.
Applications
- Computer system thermal management (laptops, desktops, workstations, servers).
- Electronic test equipment.
- Office electronics.
Q & A
- What is the primary function of the LM86CIMX/NOPB?
The LM86CIMX/NOPB is an 11-bit digital temperature sensor designed to accurately measure both local and remote temperatures using a 2-wire SMBus serial interface.
- What is the accuracy of the remote diode temperature measurement?
The remote diode temperature accuracy is ±0.75°C at TA = 30°C, TD = 80°C, and up to ±3.0°C over other temperature ranges.
- What is the resolution of the temperature measurements?
The resolution is 0.125°C.
- What types of packages are available for the LM86CIMX/NOPB?
The LM86CIMX/NOPB is available in 8-Pin VSSOP and SOIC packages.
- How does the ALERT output function?
The ALERT output is activated when any temperature goes outside a preprogrammed window set by the HIGH and LOW temperature limit registers or exceeds the T_CRIT temperature limit.
- Is the LM86 compatible with other temperature sensors?
Yes, the LM86 is pin and register compatible with the Analog Devices ADM1032 and Maxim MAX6657/8.
- What is the supply voltage range for the LM86CIMX/NOPB?
The supply voltage range is 3.0V to 3.6V.
- How does the LM86 manage power consumption?
The LM86 can be placed in a low power consumption mode (Shutdown) by setting the RUN/STOP bit in the Configuration register.
- What is the typical supply current of the LM86CIMX/NOPB?
The typical supply current is 0.8mA.
- What are some common applications of the LM86CIMX/NOPB?
Common applications include computer system thermal management, electronic test equipment, and office electronics.
