Overview
The LM82CIMQAX/NOPB, produced by Texas Instruments, is a digital temperature sensor designed to accurately sense the temperature of both local and remote diodes. This component features a two-wire serial interface compatible with SMBus and I2C protocols, enabling it to communicate with a host system efficiently. The LM82 is particularly useful in system thermal management, allowing for the monitoring of temperatures in various electronic devices, including CPUs and other integrated circuits.
Key Specifications
| Parameter | Value | Units |
|---|---|---|
| Supply Voltage Range (VCC) | 3.0 to 3.6 | V |
| Supply Current (max) | 0.8 | mA |
| Local Temperature Accuracy (includes quantization error) | 0 to +85 ±3.0°C (max) | °C |
| Remote Diode Temperature Accuracy (includes quantization error) | +25°C to +100°C ±3°C (max), 0°C to +125°C ±4°C (max) | °C |
| Temperature Resolution | 8 bits, 1°C | |
| Operating Temperature Range | -40°C to +125°C | °C |
| SMBus Clock Frequency | 100 kHz (max), 10 kHz (min) | kHz |
Key Features
- Accurately senses die temperature of remote ICs or diode junctions.
- On-board local temperature sensing.
- SMBus and I2C compatible interface, supports SMBus 1.1 TIMEOUT.
- Two interrupt outputs: INT and T_CRIT_A.
- Register readback capability.
- 7-bit plus sign temperature data format, 1°C resolution.
- 2 address select pins allow connection of up to 9 LM82s on a single bus.
- Digital comparators compare local and remote temperature readings to user-programmable setpoints.
Applications
- System thermal management.
- Computers.
- Electronic test equipment.
- Office electronics.
- HVAC systems.
Q & A
- What is the primary function of the LM82CIMQAX/NOPB?
The primary function of the LM82CIMQAX/NOPB is to accurately sense the temperature of both local and remote diodes using a two-wire serial interface.
- What are the compatible communication protocols for the LM82?
The LM82 is compatible with SMBus and I2C protocols.
- What is the supply voltage range for the LM82?
The supply voltage range for the LM82 is 3.0 to 3.6 volts.
- What is the maximum supply current of the LM82?
The maximum supply current of the LM82 is 0.8 mA.
- How accurate is the local temperature sensing of the LM82?
The local temperature accuracy of the LM82 is ±3.0°C (max) from 0 to +85°C.
- What is the resolution of the temperature data provided by the LM82?
The temperature data resolution of the LM82 is 8 bits, with a least significant bit (LSB) equal to 1°C.
- Can multiple LM82 devices be connected on the same bus?
Yes, up to 9 LM82 devices can be connected on the same bus using the 2 address select pins.
- What are the interrupt outputs of the LM82 used for?
The INT and T_CRIT_A outputs are used to indicate when temperature readings exceed user-programmable setpoints.
- What is the operating temperature range of the LM82?
The operating temperature range of the LM82 is -40°C to +125°C.
- How does the LM82 handle serial interface errors?
The LM82 resets its serial interface to the idle state if the SMBData or SMBCLK lines are held low for 40 ms or more.
