LTC2986HLX#PBF

Thermal Management Overview

The LTC2986HLX#PBF is a multi-sensor high-accuracy digital temperature measurement system with EEPROM, housed in a 48-lead (7mm × 7mm) LQFP package. It operates on a single supply voltage ranging from 2.85V to 5.25V and supports an industrial temperature range of -40°C to +125°C. The device features ten flexible analog inputs capable of directly digitizing thermocouples, RTDs, thermistors, and diodes. It includes built-in excitation current sources, automatic cold junction compensation, and fault detection circuitry. The integrated 24-bit ADC provides 0.1°C accuracy and 0.001°C resolution.

Thermal Management Feature Summary

• Directly digitizes standard thermocouples, RTDs, thermistors, and diodes without external signal conditioning
• Includes on-chip EEPROM for storing channel configuration data and custom coefficients
• Provides automatic thermocouple cold junction compensation using internal or external sensors
• Features buffered inputs allowing external protection and simultaneous 50Hz/60Hz noise rejection

Thermal Management Applications

• Industrial process control systems requiring multi-point temperature monitoring
• HVAC equipment utilizing direct sensor interface capabilities
• Medical instrumentation demanding high accuracy and fault detection
• Automotive thermal management systems operating in extended temperature ranges

Thermal Management Procurement Notes

Verify the specific H-grade suffix ensures operation within the -40°C to +125°C range required for your application environment. Confirm that the LQFP-48 package dimensions align with your PCB footprint constraints. Ensure the SPI interface timing parameters meet your microcontroller's clock speed requirements before finalizing the design.

Thermal Management Selection Notes

Select this component when designing systems that require direct connection to diverse sensor types including thermocouples and RTDs. The inclusion of EEPROM allows for permanent storage of calibration data and configuration settings. Consider the 10-channel input capacity against your total monitoring points to optimize board space and cost efficiency.

Thermal Management Part Context

This part belongs to the LTC2986 family, which serves as a software and pin-compatible alternative to the 20-channel LTC2983/LTC2984 series. The 'H' designation indicates the extended high-temperature grade variant. The '-1' suffix denotes the version equipped with non-volatile EEPROM memory for persistent data storage.

Thermal Management Replacement Considerations

LTC2986ILX#PBF

Thermal Management FAQ

How does the device handle thermocouple cold junction compensation?

The LTC2986 automatically measures the cold junction temperature using an internal or external sensor such as a diode, RTD, or thermistor, and performs the necessary calculations to determine the accurate thermocouple temperature.

What is the function of the Q1, Q2, and Q3 pins?

These pins serve as external bypass connections for the integrated charge pump. They must be connected to capacitive loads only, specifically 10µF X7R capacitors, to support the internal negative voltage generation.