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Temperature sensors support latest DIMM standard

Geneva—Designed to monitor the temperature of DIMMs used in PCs, STMicroelectronics is offering two high-accuracy application specific digital temperature-sensor chips—the STTS424 and STTS424E02— that fully comply with the JEDEC JC42.4 specification.

The STTS424 is a standalone digital temperature sensor, while the STTS424E02 integrates the temperature sensor with a 2 Kbit Serial Presence Detect (SPD) EEPROM that is used on DIMMs to store timing parameters and other information about the module, in accordance with JEDEC requirements. Both devices communicate with the CPU chipset through an I²C/SMBus-compatible serial bus, and are available in 2 x 3mm DFN8 and 4.4 x 3mm TSSOP8 packages.

According to ST, the STTS424 sensor has a 50% lower operating current than competitive devices and the JEDEC JC42.4 standard. The integrated STTS424E02 can replace the 2 Kbit SPD EEPROM of existing memory module implementations. For programming ease, the temperature sensor and the EEPROM in the STTS424E02 each have their own unique I²C/SMBus address.

The devices integrate an A/D converter, which monitors and digitizes the temperature with a resolution down to 0.25°C, and an accuracy of ±1°C, over the +75 to +95°C temperature range.

Pricing: The STTS424 is priced at $0.70, and the STTS424E02 at $0.85, in high volume quantities.
Availability: Now for production orders.
Datasheets: STTS424 and STTS424E02.

STMicroelectronics, +41 22 929 29 29, www.st.com

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