MCP9805T-BE/MNY

Overview

The MCP9805T-BE/MNY is a digital temperature sensor designed for JEDEC JC42.4 compliance in mobile platform memory modules. It operates within a voltage range of 3.0V to 3.6V and features a 2-wire SMBus/I2C interface. The device provides an accuracy of ±1°C (max.) from +75°C to +95°C, ±2°C (max.) from +40°C to +125°C, and ±3°C (max.) from -20°C to +125°C. It offers user-programmable temperature boundaries and critical output capabilities.

Feature Summary

• Complies with JEDEC standard JC42.4 for mobile platform memory module thermal sensing
• Features user-programmable registers for shutdown modes and temperature event boundaries
• Provides open-drain Event output configurable as comparator or interrupt signal
• Supports multi-sensor control on a single serial bus via standard I2C/SMBus protocol

Applications

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

Procurement Notes

Verify the specific suffix MNY against official Microchip documentation to confirm package type and tape/reel specifications. Ensure the ordering code matches the required DFN-8 or TSSOP-8 configuration. Cross-reference the manufacturer ID register value (0x0054) during integration testing to validate component authenticity.

Selection Notes

Select this component for applications requiring strict adherence to JEDEC JC42.4 standards. It is suitable for systems needing programmable temperature limits and low-power shutdown modes. Verify that the operating voltage range of 3.0V to 3.6V aligns with the system power supply. Consider the thermal response time requirements when choosing between DFN-8 and TSSOP-8 packages.

Part Context

The MCP9805 is part of Microchip's digital temperature sensor family, specifically engineered for memory module thermal management. It integrates a band gap sensor and Delta-Sigma ADC to convert temperatures between -40°C and +125°C. The device supports up to eight sensors on a single bus, facilitating sophisticated multi-zone monitoring in compact electronic designs.

Replacement Considerations

Consult official substitution guides for compatible devices. Verify pin compatibility and register mapping if replacing with other MCP98xx series variants. Ensure electrical characteristics such as operating voltage and accuracy meet the original design specifications.

FAQ

What is the default resolution of the MCP9805?

The default measurement resolution is 0.25 °C/LSb.

How is the Event output configured?

The Event output can be configured as an active-low or active-high comparator output, or as a temperature event interrupt output for microprocessor-based systems.