SE98ATP,547【PDF 1/43 页】IC TEMP SENSOR DDR 8-HWSON

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1. General description

The NXP Semiconductors SE98A measures temperature from 40 癈 and +125 癈 with

JEDEC Grade B ? 癈 accuracy between +75 癈 and +95 癈 communicating via the

C-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 Thermal Sensor Component specification.

The SE98A thermal sensor operates over the V

range of 1.7 V to 3.6 V. The SE98A

does not include the 2 k SPD and is designed for custom DIMM where larger SPD is

required.

The Temp Sensor (TS) consists of an Analog-to-Digital Converter (ADC) that monitors

and updates its own temperature readings 8 times per second, converts the reading to a

digital data, and latches them into the data temperature registers. User-programmable

registers, such as Shutdown or Low-power modes and the specification of temperature

event and critical output boundaries, provide flexibility for DIMM temperature-sensing

applications.

When the temperature changes beyond the specified boundary limits, the SE98A outputs

an EVENT

signal using an open-drain output that can be pulled up between 0.9 V and

3.6 V. The user has the option of setting the EVENT

output signal polarity as either an

active LOW or active HIGH comparator output for thermostat operation, or as a

temperature event interrupt output for microprocessor-based systems. The EVENT

output

can even be configured as a critical temperature output.

The SE98A supports the industry-standard 2-wire I

C-bus/SMBus serial interface. The

SMBus TIMEOUT function is supported to prevent system lock-ups. Manufacturer and

Device ID registers provide the ability to confirm the identify of the device. Three address

pins allow up to eight devices to be controlled on a single bus.

The SE98A is an improved SE98 and is comparable to the thermal sensor in the SE97 but

with voltage range of 1.7 V to 3.6 V.

2. Features

JEDEC (JC-42.4) TS3000B1 DIMM ?0.5 癈 (typ.) between 75 癈 and 95 癈

temperature sensor

Optimized for voltage range: 1.7 V to 3.6 V

Shutdown current: 0.1 糀 (typ.) and 5.0 糀 (max.)

2-wire interface: I

C-bus/SMBus compatible, 0 Hz to 400 kHz

SMBus ALERT and TIMEOUT (programmable)

11-bit ADC Temperature-to-Digital converter with 0.125 癈 resolution

SE98A

DDR memory module temp sensor, 1.7 V to 3.6 V

Rev. 04 25 November 2009

Product data sheet

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