MCP9843T-BE/MNY

Thermal Management Overview

The MCP9843T-BE/MNY is a digital temperature sensor manufactured by Microchip Technology, designed for board-mount applications. It features an internal sensor with a specified operating temperature range of -40°C to +125°C and meets JEDEC JC42.4-TSE3000B3 specifications. The device utilizes a 2-wire I²C/SMBus interface and operates within a voltage range of 2.7V to 5.5V. It provides Grade B accuracy of ±0.2°C typical and ±1°C maximum between +75°C and +95°C. The component is housed in an 8-pin DFN package.

Thermal Management Feature Summary

• Integrates a 2 Kbit Serial EEPROM specifically organized for DRAM DIMM Serial Presence Detect (SPD) functionality.
• Supports permanent and reversible software write protection mechanisms for memory data security.
• Features user-programmable registers allowing configurable shutdown modes and temperature event boundaries.
• Provides an open-drain Event output pin that signals when ambient temperature exceeds defined limits.

Thermal Management Applications

• DIMM Modules for Servers
• DIMM Modules for PCs
• DIMM Modules for Laptops

Thermal Management Procurement Notes

Verify the specific suffix 'MNY' against official Microchip documentation to confirm package type and tape-and-reel configuration. Ensure the selected variant matches the required JEDEC compliance level and address pin configurations for your system design.

Thermal Management Selection Notes

Select this component when SPD storage capabilities are required alongside precise thermal monitoring. Consider the ±1°C maximum accuracy specification for the full operating range. Verify that the host controller supports the standard I²C protocol and can handle the necessary pull-up requirements for the SDA and SCL lines.

Thermal Management Part Context

This part belongs to the MCP9843/98243 family of digital temperature sensors. While the MCP9843 lacks non-volatile memory, the MCP98243 variant includes the integrated EEPROM. This specific model combines high-accuracy sensing with memory functions tailored for memory module identification and vendor information storage.

Thermal Management Replacement Considerations

The MCP9843 serves as a direct substitute if EEPROM functionality is not required. The MCP98242 offers similar sensing but lacks the timeout feature and has different electrical characteristics. Verify pin compatibility and register mapping before swapping models.

Thermal Management FAQ

What is the function of the A0 pin on this device?

The A0 pin serves as a slave address input bit and acts as a multi-function pin for applying high voltage (VHV) to enable the EEPROM Software Write Protect feature.

How does the device handle I²C bus timeouts?

The temperature sensor interface includes a timeout mechanism that resets the serial interface if the SCL line remains low or high for a specified duration, whereas the EEPROM interface does not reset.

Can the Event output be used during Shutdown mode?

Yes, the Event output de-asserts during shutdown mode, distinguishing it from previous generations where the output state remained unchanged.