se98a NXP Semiconductors, se98a Datasheet

se98a

Manufacturer Part Number

se98a

Description

Ddr Memory Module Temp Sensor, 1.7 V To 3.6 V

Manufacturer

NXP Semiconductors

Datasheet

1.SE98A.pdf (42 pages)

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1. General description

2. Features

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

JEDEC Grade B 1 C accuracy between +75 C and +95 C communicating via the

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

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. 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

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.

C-bus/SMBus. It is typically mounted on a Dual In-Line Memory Module (DIMM)

SE98A

DDR memory module temp sensor, 1.7 V to 3.6 V

Rev. 01 — 5 March 2009

JEDEC (JC-42.4) DIMM temperature sensor

Optimized for voltage range: 1.7 V to 3.6 V

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

2-wire interface: I

SMBus ALERT and TIMEOUT (programmable)

ESD protection exceeds 2000 V HBM per JESD22-A114, 250 V MM per

JESD22-A115, and 1000 V CDM per JESD22-C101

Latch-up testing is done to JEDEC Standard JESD78 which exceeds 100 mA

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

range of 1.7 V to 3.6 V. The SE98A

C-bus/SMBus serial interface. The

Product data sheet

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