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
I
2
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
DD
 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
2
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
2
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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