MCP98242T-BE/MCBAC

Overview

The MCP98242T-BE/MCBAC is a digital temperature sensor and serial EEPROM integrated circuit manufactured by Microchip Technology. It features an internal temperature sensor with ±0.5°C typical accuracy between +75°C and +95°C, and ±1°C maximum accuracy from +40°C to +125°C. The device includes a 256-byte Serial Presence Detect (SPD) EEPROM for memory module information storage. It operates on a 3.0V to 3.6V supply with a shutdown current of 3 µA maximum. Communication is handled via a 2-wire I²C/SMBus compatible interface.

Feature Summary

• Integrates a high-accuracy digital temperature sensor with user-programmable registers for boundary trip limits and event output configuration.
• Includes a 256-byte Serial EEPROM optimized for DIMM Serial Presence Detect (SPD) applications with permanent and reversible software write protection capabilities.
• Supports low-power operation through a Shutdown mode that reduces standby current to 3 µA maximum while maintaining register accessibility.

Applications

• JEDEC-compliant DIMM modules
• Laptops and personal computers
• Servers and hard disk drives

Procurement Notes

Verify the specific suffix 'MCBAC' against official Microchip documentation to confirm package type and tape/reel specifications. Confirm component status as active or obsolete prior to procurement planning. Ensure voltage requirements align with the specified 3.0V to 3.6V operating range for proper functionality.

Selection Notes

Select this component for applications requiring JEDEC JC42.4 compliance and integrated SPD storage. Consider the ±0.5°C accuracy in the active range for precise thermal monitoring. Evaluate the 8-pin package options available for the MCP98242 family to match PCB layout constraints.

Part Context

The MCP98242 belongs to Microchip's line of digital temperature sensors designed specifically for mobile platform memory modules. It combines thermal sensing with non-volatile memory to meet industry standards for DRAM DIMMs. The device simplifies system design by integrating both sensing and identification data storage into a single compact package.

Replacement Considerations

Check for MCP98243 variants which offer higher accuracy but may differ in pinout or power specifications. Verify compatibility with existing I²C addresses and EEPROM structures when substituting with other MCP982xx series devices.

FAQ

What is the purpose of the Event output pin?

The Event output pin is an open-drain output that signals when the ambient temperature exceeds user-programmable upper or lower boundary limits or critical temperature thresholds.

How is the EEPROM write protection configured?

The lower 128 bytes can be permanently write-protected (PWP) or software reversibly write-protected (SWP), while the upper 128 bytes remain unprotected for general-purpose data storage.