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NXP Semiconductors - DDR Memory Module Temp Sensor

Numéro de référence SE98A
Description DDR Memory Module Temp Sensor
Fabricant NXP Semiconductors 
Logo NXP Semiconductors 





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SE98A fiche technique
SE98A
DDR memory module temp sensor, 1.7 V to 3.6 V
Rev. 01 — 5 March 2009
Product data sheet
www.datasheet4u.com
1. General description
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
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 Thermal Sensor Component specification.
The SE98A thermal sensor operates over the VDD 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. 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 I2C-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
I JEDEC (JC-42.4) DIMM temperature sensor
I Optimized for voltage range: 1.7 V to 3.6 V
I Shutdown current: 0.1 µA (typ.) and 5.0 µA (max.)
I 2-wire interface: I2C-bus/SMBus compatible, 0 Hz to 400 kHz
I SMBus ALERT and TIMEOUT (programmable)
I ESD protection exceeds 2000 V HBM per JESD22-A114, 250 V MM per
JESD22-A115, and 1000 V CDM per JESD22-C101
I Latch-up testing is done to JEDEC Standard JESD78 which exceeds 100 mA

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