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DDR4 DIMM Temperature Sensor with EEPROM for SPD MCP98244
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Microchip Technology Inc.’s MCP98244 digital temperature sensor converts temperature from -40°C and +125°C to a digital word. This sensor meets JEDEC Specification JC42.4-TSE3000B1 Memory Module Thermal Sensor Component. It provides an accuracy of ±0.2°C/±1°C （typical/maximum） from +75°C to +95°C with an operating voltage of 1.7V to 3.6V. In addition， MCP98244 has an integrated EEPROM with two banks of 256 by 8 bit EEPROM （4k Bit） which can be used to store memory module details and vendor information. The MCP98244 digital temperature sensor comes with user-programmable registers that provide flexibility for DIMM temperature-sensing applications. The registers allow user-selectable settings such as Shutdown or Low-Power modes and the specification of temperature Event boundaries. When the temperature changes beyond the specified Event boundary limits， the MCP98244 outputs an Alert signal at the Event pin. The user has the option of setting the temperature Event output signal polarity as either an active-low or active-high comparator output for thermostat operation， or as a temperature Event interrupt output for microprocessor-based systems. The MCP98244 EEPROM is designed specifically for DRAM DIMMs （Dual In-line Memory Modules） Serial Presence Detect （SPD）。 It has four 128 Byte pages， which can be Software Write Protected individually. This allows DRAM vendor and product information to be stored and write-protected. This sensor has an industry standard I2C Fast Mode Plus compatible 1 MHz serial interface.
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