STTS424E02CDA3F datasheet(6/51 Pages) STMICROELECTRONICS

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Description

STTS424E02

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Description

The STTS424E02 is targeted for DIMM Modules in Mobile Personal Computing Platforms

(Laptops), Server Memory Modules and other industrial applications. The Thermal Sensor

(TS) in the STTS424E02 is compliant with the JEDEC specification, which defines Memory

Module Thermal Sensors requirements for Mobile platforms. The 2 Kbit Serial Presence

Detect (SPD) I2C-compatible Electrically Erasable Programmable Memory (EEPROM) in

the STTS424E02 is organized as 256 x8 bits and is functionally identical to the industry

standard M34E02.

The TS-SPD EEPROM combination provides space as well as cost savings for Mobile and

Server Platform Dual Inline Memory Modules (DIMM) manufacturers, as it is packaged in

the compact 2 mm x 3 mm 8-lead DFN package which is available in two variations. The DA

package has a maximum height of 0.90 mm. The DN package has an identical footprint as

the DA package with a thinner maximum height of 0.80 mm. The DN package is compliant

to JEDEC MO-229, variation WCED-3.

The temperature sensor includes a band gap-based temperature sensor and 10-bit Analog-

to-Digital Converter (ADC) which monitor and digitize the temperature to a resolution of up

to 0.25°C. The typical accuracies over these temperature ranges are:

●

±3°C (max) over the full temperature measurement range of –40°C to 125°C,

●

±2°C in the +40°C to +125°C temperature range, and

●

±1°C in the +75°C to +95°C temperature range.

The temperature sensor in the STTS424E02 is specified for operating at supply voltages

from 2.7 V to 3.6 V. Operating at 3.3 V, the supply current is 100 µA (typ).

The on-board sigma delta ADC converts the measured temperature to a digital value that is

calibrated in °C. For Fahrenheit applications, a lookup table or conversion routine is

required. The STTS424E02 is factory-calibrated and requires no external components to

measure temperature.

The digital temperature sensor component has user-programmable registers that provide

the capabilities for DIMM temperature-sensing applications. The open drain Event output pin

is active when the monitoring temperature exceeds a programmable limit, or it falls above or

below an alarm window. The user has the option to set the Event output as a critical

temperature output. This pin can be configured to operate in either a comparator mode for

thermostat operation or in interrupt mode.

The 2 Kbit serial EEPROM memory in the STTS424E02 has the ability to permanently lock

the data in its first half (upper) 128 bytes (locations 00h to 7Fh). This facility has been

designed specifically for use in DRAM DIMMs with SPD. All of the information concerning

the DRAM module configuration (e.g. access speed, size, and organization) can be kept

write protected in the first half of the memory. The second half (lower) 128 bytes of the

memory can be write protected using two different software write protection mechanisms.

By sending the device a specific sequence, the first 128 bytes of the memory become write

protected: permanently or resettable. In the STTS424E02 the EEPROM Write Control (WC)

is always held low. Thus, the write protection of the memory array is dependent on whether

the software protection has been set.

STTS424E02CDA3F Datasheet(PDF) 6 Page - STMicroelectronics

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