MCP98243 Memory Module Temperature Sensor w/ EEPROM for SPD Features Description Meets JEDEC Specification JC42.4-TSE2002B3 Microchip Technology Inc.s MCP98243 digital temperature sensor converts temperature from -40C Temperature Sensor + 2 Kbit Serial EEPROM and +125C to a digital word. This sensor meets EEPROM for Serial Presence Detect (SPD) JEDEC Specification JC42.4-TSE2002B3 Platform 2 2-wire I C/SMBus Interface Memory Module Thermal Sensor Component. It Available Packages: provides an accuracy of 0.2C/1C (typical/maxi- - DFN-8, TDFN-8, UDFN-8, TSSOP-8 mum) from +75C to +95C. In addition, this device has an internal 256 Byte EEPROM which can be used to store memory module and vendor information. Temperature Sensor Features The MCP98243 digital temperature sensor comes with Temperature-to-Digital Converter user-programmable registers that provide flexibility for Sensor Accuracy (Grade B): DIMM temperature-sensing applications. The registers - 0.2C/1C (typ./max.) +75C to +95C allow user-selectable settings such as Shutdown or +40C to +125C - 0.5C/2C (typ./max.) Low-Power modes and the specification of temperature Event boundaries. When the temperature - 1C/3C (typ./max.) -20C to +125C changes beyond the specified Event boundary limits, Specified V Range: 3.0V to 3.6V DD the MCP98243 outputs an Alert signal at the Event pin. Operating Current: 200 A (typical) The user has the option of setting the temperature Operating V Range: 2.7V to 5.5V DD Event output signal polarity as either an active-low or active-high comparator output for thermostat operation, Serial EEPROM Features or as a temperature Event interrupt output for micropro- cessor-based systems. Specified V Range: 1.8V to 5.5V DD The EEPROM is designed specifically for DRAM Operating Current: DIMMs (Dual In-line Memory Modules) Serial Presence -Write 1.1 mA (typical) for 3.5 ms (typical) Detect (SPD). The lower 128 Bytes (address 0x00 to - Read 100 A (typical) 0x7F) can be Permanent Write Protected (PWP) or Permanent and Reversible Software Write Protect Software Reversible Write Protected (SWP). This Software Write Protection for the lower 1 Kbit allows DRAM vendor and product information to be stored and write protected. The upper 128 bytes Organized as 1 block of 256 x 8-bit (2 Kbit) (address 0x80 to 0xFF) can be used for general pur- pose data storage. These addresses are not write Typical Applications protected. DIMM Modules for Servers, PCs, and Laptops 2 This sensor has an industry standard 2-wire, I C General Purpose Temperature Datalog compatible serial interface, allowing up to eight devices to be controlled in a single serial bus. DIMM MODULE Package Types 8-Pin 2x3 DFN/TDFN/UDFN * 8-Pin TSSOP 1 V A0 1 8 V 8 A0 DD DD Event 2 A1 7 A1 2 7 Event EP 9 A2 SCL 3 6 A2 3 6 SCL GND 4 SDA GND SDA 5 4 5 * Includes Exposed Thermal Pad (EP) see Table 3-1. MCP98243 2009 Microchip Technology Inc. DS22153A-page 1MCP98243 Sensor Typical Accuracy Performance 50% T = +85C Statistics: A Average = 0.003 C 1,063,478 units 40% St. Dev = 0.13 C 63 Production lots 3 Sigma = 0.4 C 30% 20% 10% 0% Temperature Accuracy (C) DS22153A-page 2 2009 Microchip Technology Inc. Occurrences -1.0 -0.8 -0.6 -0.4 -0.2 0.0 0.2 0.4 0.6 0.8 1.0