MCP98242-BE/ST

Overview

The MCP98242-BE/ST is a digital temperature sensor and serial EEPROM integrated circuit manufactured by Microchip Technology. It operates within a voltage range of 3.0V to 3.6V and features an I2C/SMBus compatible interface. The device provides temperature sensing from -40°C to +125°C with accuracy ranging from ±0.5°C to ±3°C depending on the temperature range. It includes a 256-byte EEPROM for Serial Presence Detect (SPD) data storage, housed in an 8-pin TSSOP package.

Feature Summary

• Integrates a digital temperature sensor with a 256-byte Serial EEPROM designed for DIMM SPD applications.
• Features user-programmable registers for configuring shutdown modes, hysteresis, and event output boundaries.
• Supports permanent and reversible software write protection for memory segments to secure vendor information.
• Complies with JEDEC JC42.4 Mobile Platform Memory Module Thermal Sensor Component specifications.

Applications

• DIMM Modules
• Laptops, Personal Computers and Servers
• Hard Disk Drives and Other PC Peripherals

Procurement Notes

Verify component authenticity through authorized Microchip distributors or certified suppliers. Confirm the specific suffix BE/ST corresponds to the TSSOP-8 package variant. Ensure compliance with RoHS3 standards as indicated in official documentation. Request datasheet DS21996D for detailed electrical characteristics and pin configurations prior to integration.

Selection Notes

Select this component when designing systems requiring JEDEC-compliant thermal monitoring for memory modules. The integrated EEPROM simplifies board layout by combining temperature sensing with SPD data storage. Consider the 3.0V to 3.6V operating voltage range and I2C/SMBus interface compatibility with host controllers. Evaluate the need for programmable event outputs and write-protection features for system security.

Part Context

The MCP98242 belongs to Microchip's family of digital temperature sensors optimized for mobile platform memory modules. It combines high-accuracy sensing with non-volatile memory capabilities. The device meets industry standards for thermal management in computing environments. Its design facilitates easy integration into systems requiring precise temperature monitoring and data integrity for memory components.

Replacement Considerations

Check for availability of alternative packages such as DFN-8 or UDFN-8 if space constraints differ. Verify functional equivalence with other MCP9824x series variants regarding register maps and interface protocols. Ensure substitute components support the same JEDEC JC42.4 compliance and EEPROM capacity requirements.

FAQ

What is the purpose of the Event output pin?

The Event output pin signals when the ambient temperature exceeds user-programmed boundary limits. It can be configured as an active-low or active-high comparator output or as a temperature event interrupt.

How is the EEPROM write protection implemented?

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