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SE98 PDF даташит

Спецификация SE98 изготовлена ​​​​«NXP Semiconductors» и имеет функцию, называемую «SO-DIMM SMBus/I2C-bus temperature sensor».

Детали детали

Номер произв SE98
Описание SO-DIMM SMBus/I2C-bus temperature sensor
Производители NXP Semiconductors
логотип NXP Semiconductors логотип 

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SE98 Даташит, Описание, Даташиты
SE98
SO-DIMM SMBus/I2C-bus temperature sensor
Rev. 02 — 7 January 2008
Product data sheet
www.datasheet4u.com
1. General description
The NXP Semiconductors SE98 measures temperature from 20 °C and +125 °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.
Placing the Temp Sensor (TS) on DIMM allows accurate monitoring of the DIMM module
temperature to better estimate the DRAM case temperature (Tcase) to prevent it from
exceeding the maximum operating temperature of 85 °C. The chip set throttles the
memory traffic based on the actual temperatures instead of the calculated worst-case
temperature or the ambient temperature using a temp sensor mounted on the
motherboard. There is up to a 30 % improvement in thin and light notebooks that are
using one or two 1G SO-DIMM modules, although other memory modules such as in
server applications will also see an increase in system performance. Future uses of the
TS will include more dynamic control over thermal throttling, the ability to use the Alarm
Window to create multiple temperature zones for dynamic throttling and to save processor
time by scaling the memory refresh rate.
The 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 SE98 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 SE98 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. To maintain
interchangeability with the I2C-bus/SMBus interface the electrical specifications are
specified with the operating voltage of 3.0 V to 3.6 V.
DIMM applications normally use the C-grade accuracy SE98PW or SE98TK temp sensor.
For applications requiring the higher B-grade accuracy, the SE98PW/1 or SE98TK/1 is
available.









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SE98 Даташит, Описание, Даташиты
NXP Semiconductors
SE98
SO-DIMM SMBus/I2C-bus temperature sensor
2. Features
www.datasheet4u.com
2.1 General features
I JEDEC (JC-42.4) SO-DIMM temperature sensor
I Optimized for voltage range: 3.0 V to 3.6 V
I Shutdown/Standby current: 8 µA (typ.) and 15 µA (max.)
I 2-wire interface: I2C-bus/SMBus compatible, 0 Hz to 400 kHz
I SMBus ALERT and TIMEOUT (programmable)
I Available packages: TSSOP8 and HVSON8
2.2 Temperature sensor features
I Temperature-to-Digital converter
I Operating current: 200 µA (typ.) and 250 µA (max.)
I Programmable hysteresis threshold: 0 °C, 1.5 °C, 3 °C, 6 °C
I Over/under/critical temperature EVENT output
I B grade accuracy:
N ±0.5 °C/±1 °C (typ./max.) +75 °C to +95 °C
N ±1 °C/±2 °C (typ./max.) +40 °C to +125 °C
N ±2 °C/±3 °C (typ./max.) → −20 °C to +125 °C
I C grade accuracy:
N ±1 °C/±2 °C (typ./max.) +75 °C to +95 °C
N ±2 °C/±3 °C (typ./max.) +40 °C to +125 °C
N ±3 °C/±4 °C (typ./max.) → −20 °C to +125 °C
3. Applications
I DDR2 and DDR3 memory modules
I Laptops, personal computers and servers
I Enterprise networking
I Hard disk drives and other PC peripherals
4. Ordering information
Table 1. Ordering information
Type number Topside
mark
Package
Name
SE98PW
SE98
TSSOP8
SE98TK
SE98
HVSON8
Description
plastic thin shrink small outline package; 8 leads;
body width 4.4 mm
plastic thermal enhanced very thin small outline package;
no leads; 8 terminals; body 3 × 3 × 0.85 mm
Version
SOT530-1
SOT908-1
SE98_2
Product data sheet
Rev. 02 — 7 January 2008
© NXP B.V. 2008. All rights reserved.
2 of 32









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SE98 Даташит, Описание, Даташиты
NXP Semiconductors
SE98
SO-DIMM SMBus/I2C-bus temperature sensor
5. Block diagram
www.datasheet4u.com
SE98
REGISTERS
A0
CRITICAL TEMPERATURE LIMIT
A1
LOCK
UPPER TEMPERATURE LIMIT
A2 PROTECT LOWER TEMPERATURE LIMIT
HYSTERESIS THRESHOLD
MANUFACTURER ID
DEVICE ID
DEVICE CAPABILITY REGISTER
CONFIGURATION REGISTER
VSS
EVENT OUTPUT COMPARATOR/INT MODE
EVENT OUTPUT POLARITY
ENABLE/DISABLE EVENT OUTPUT
EVENT OUTPUT STATUS
SENSOR ENABLE/SHUTDOWN
BAND GAP
TEMPERATURE
SENSOR
11-BIT
∆Σ ADC
TEMPERATURE
REGISTER
CONTROL LOGIC
I2C-bus/SMBus
INTERFACE
POR
CIRCUIT
VDD
EVENT
SCL
SDA
Fig 1. Block diagram of SE98
002aab280
SE98_2
Product data sheet
Rev. 02 — 7 January 2008
© NXP B.V. 2008. All rights reserved.
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