8GB (x72, ECC, DR) 240-Pin DDR3 VLP RDIMM
Temperature Sensor with Serial Presence-Detect EEPROM
Temperature Sensor with Serial Presence-Detect EEPROM
Thermal Sensor Operations
The temperature from the integrated thermal sensor is monitored and converts into a
digital word via the I2C bus. System designers can use the user-programmable registers
to create a custom temperature-sensing solution based on system requirements. Pro-
gramming and configuration details comply with JEDEC standard No. 21-C page 4.7-1,
"Definition of the TSE2002av, Serial Presence Detect with Temperature Sensor."
Serial Presence-Detect EEPROM Operation
DDR3 SDRAM modules incorporate serial presence-detect. The SPD data is stored in a
256-byte EEPROM. The first 128 bytes are programmed by Micron to comply with JE-
DEC standard JC-45, "Appendix X: Serial Presence Detect (SPD) for DDR3 SDRAM Mod-
ules." These bytes identify module-specific timing parameters, configuration informa-
tion, and physical attributes. The remaining 128 bytes of storage are available for use by
the customer. System READ/WRITE operations between the master (system logic) and
the slave EEPROM device occur via a standard I2C bus using the DIMM’s SCL (clock)
SDA (data), and SA (address) pins. Write protect (WP) is connected to VSS, permanently
disabling hardware write protection. For further information refer to Micron technical
note TN-04-42, "Memory Module Serial Presence-Detect."
PDF: 09005aef8482a8a7
jdf18c1gx72pdz.pdf – Rev. D 12/12 EN
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