MCP9805T-BE/MC

Overview

The MCP9805T-BE/MC is a digital temperature sensor designed for mobile platform memory module thermal monitoring, meeting JEDEC JC42.4 standards. It operates within a voltage range of 3.0V to 3.6V and features a 2-wire SMBus/Standard mode I²C compatible interface. The device provides an accuracy of ±1°C (max.) from +75°C to +95°C and ±2°C (max.) from +40°C to +125°C. Operating current is typically 200 µA, with shutdown current at 0.1 µA. It supports user-programmable temperature boundaries and critical outputs.

Feature Summary

• Complies with JEDEC standard JC42.4 for mobile platform memory module thermal sensing applications.
• Features user-programmable registers for configuring shutdown modes, low-power settings, and temperature event boundaries.
• Provides open-drain Event output configurable as active-high or active-low comparator/interrupt signals.
• Utilizes a Delta-Sigma ADC for converting analog temperature data into digital words via a serial interface.

Applications

• Dual In-line Memory Module (DIMM) thermal monitoring
• Personal Computers (PCs) and Servers
• Hard Disk Drives and Other PC Peripherals

Procurement Notes

Verify the specific suffix 'MC' corresponds to the DFN-8 package when sourcing. Confirm that the operating voltage requirements align with the 3.0V to 3.6V specification provided in the datasheet. Ensure compatibility with the SMBus/Standard mode I²C interface protocol used by the host controller.

Selection Notes

Select this component for applications requiring compliance with JEDEC JC42.4 standards. Consider its narrow operating voltage range of 3.0V to 3.6V compared to wider range sensors. Evaluate the need for its specific accuracy levels across different temperature ranges relative to system requirements.

Part Context

This part belongs to the MCP9805 series of digital temperature sensors manufactured by Microchip Technology. It is specifically engineered for memory module thermal management. The series includes variants with different packages such as TSSOP-8 and DFN-8, sharing core functional specifications.

Replacement Considerations

Check for other MCP9805 variants with different package suffixes if pinout compatibility differs. Verify if alternative sensors meet the same JEDEC JC42.4 standard and voltage constraints before substitution.

FAQ

What is the maximum accuracy of the MCP9805 in the active temperature range?

The maximum accuracy is ±1°C from +75°C to +95°C.

How is the Event output configured on the MCP9805?

The Event output is an open-drain pin that can be configured as either an active-low or active-high comparator output, or as a temperature event interrupt output.