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SE97

NXP Semiconductors
Part Number SE97
Manufacturer NXP Semiconductors
Description DDR memory module temp sensor
Published Mar 18, 2010
Detailed Description SE97 Rev. 07 — 29 January 2010 www.DataSheet4U.com DDR memory module temp sensor with integrated SPD, 3.3 V Product da...
Datasheet PDF File SE97 PDF File

SE97
SE97

Overview
SE97 Rev.
07 — 29 January 2010 www.
DataSheet4U.
com DDR memory module temp sensor with integrated SPD, 3.
3 V Product data sheet 1.
General description The NXP Semiconductors SE97 measures temperature from −40 °C to +125 °C with JEDEC Grade B ±1 °C accuracy between +75 °C and +95 °C and also provide 256 bytes of EEPROM memory communicating via the I2C-bus/SMBus.
It is typically mounted on a Dual In-line Memory Module (DIMM) measuring the DRAM temperature in accordance with the new JEDEC (JC-42.
4) Mobile Platform Memory Module Temperature Sensor Component specification and also replacing the Serial Presence Detect (SPD) which is used to store memory module and vendor information.
The SE97 thermal sensor operates over the VDD range of 3.
0 V to 3.
6 V and the EEPROM over the range of 3.
0 V to 3.
6 V write and 1.
7 V to 3.
6 V read.
Placing the Temp Sensor (TS) on a DIMM allows accurate monitoring of the DIMM module temperature to better estimate the DRAM case temperature (Tcase) to prevent it from exceeding the maximum operating temperature of 85 °C.
The chip set throttles the memory traffic based on the actual temperatures instead of the calculated worst-case temperature or the ambient temperature using a temp sensor mounted on the motherboard.
There is up to 30 % improvement in thin and light notebooks that are using one or two 1 GB SO-DIMM modules.
The TS is required on DDR3 RDIMM and RDIMM ECC.
Future uses of the TS will include more dynamic control over thermal throttling, the ability to use the Alarm Window to create multiple temperature zones for dynamic throttling and to save processor time by scaling the memory refresh rate.
The TS consists of a ΔΣ Analog-to-Digital Converter (ADC) that monitors and updates its own temperature readings 10 times per second, converts the reading to a digital data, and latches them into the data temperature register.
User-programmable registers, the specification of upper/lower alarm and critical temperature trip points, EVENT outpu...


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