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PDF SE98 Data sheet ( Hoja de datos )

Número de pieza SE98
Descripción SO-DIMM SMBus/I2C-bus temperature sensor
Fabricantes NXP Semiconductors 
Logotipo NXP Semiconductors Logotipo



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No Preview Available ! SE98 Hoja de datos, Descripción, Manual

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 pdf
NXP Semiconductors
SE98
SO-DIMM SMBus/I2C-bus temperature sensor
7. Functional description
www.datasheet4u.com
7.1 Serial bus interface
The SE98 uses the 2-wire serial bus (I2C-bus/SMBus) to communicate with a host
controller. The serial bus consists of a clock (SCL) and data (SDA) signals. The device
can operate on either the I2C-bus Standard/Fast mode or SMBus. The I2C-bus Standard
mode is defined to have bus speeds from 0 Hz to 100 kHz, I2C-bus Fast mode from 0 Hz
to 400 kHz, and the SMBus is from 10 kHz to 100 kHz. The host or bus master generates
the SCL signal, and the SE98 uses the SCL signal to receive or send data on the SDA
line. Data transfer is serial, bidirectional, and is one bit at a time with the Most Significant
Bit (MSB) transferred first, and a complete I2C-bus data is 1 byte. Since SCL and SDA are
open-drain, pull-up resistors must be installed on these pins.
7.2 Slave address
The SE98 uses a 4-bit fixed and 3-bit programmable (A0, A1 and A2) 7-bit slave address
that allows a total of eight devices to co-exist on the same bus. The input of each pin is
sampled at the start of each I2C-bus/SMBus access. The temperature sensor’s fixed
address is 0011.
Fig 4. Slave address
MSB
00
slave address
R/W
LSB
1 1 A2 A1 A0 X
fixed
hardware
selectable
002aab304
7.3 EVENT output
The EVENT pin is an open-drain output whose function can be programmed as an
interrupt, comparator, or critical alarm mode. When the device operates in Interrupt mode,
and the temperature reaches a critical temperature, the device switches to the comparator
mode automatically and asserts the EVENT pin. When the temperature drops below
critical temperature, the device reverts back to either interrupt or comparator mode, as
programmed in the Configuration register. The interrupt latch can be cleared by writing a
‘1’ to the ‘clear EVENT’ bit in the Configuration register or by performing the SMBus Alert
Response Address (ARA).
In comparator mode, the EVENT pin remains asserted until the temperature falls below
the value programmed in the Upper Boundary Alarm Trip register or rises above the value
programmed in the Lower Boundary Alarm Trip register, or until the range of these alarm
registers are reprogrammed and the temperature falls inside the alarm limits. Figure 5
depicts the EVENT output for all the three modes. All event thresholds use hysteresis as
programmed in the Configuration register.
SE98_2
Product data sheet
Rev. 02 — 7 January 2008
© NXP B.V. 2008. All rights reserved.
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SE98 arduino
NXP Semiconductors
SE98
SO-DIMM SMBus/I2C-bus temperature sensor
8. Register descriptions
www.datasheet4u.com
8.1 Register overview
This section describes all the registers used in the SE98. The registers are used for
latching the temperature reading, storing the low and high temperature limits, configuring,
the hysteresis threshold and the ADC, as well as reporting status. The device uses the
Pointer register to access these registers. Read registers, as the name implies, are used
for read only, and the write registers are for write only. Any attempt to read from a
write-only register will result in reading zeroes. Writing to a read-only register will have no
effect on the read even though the write command is acknowledged. The Pointer register
is an 8-bit register. All other registers are 16-bit.
Table 4. Register summary
Address
POR state
n/a n/a
00h 0015h/0017h
01h 0000h
02h 0000h
03h 0000h
04h 0000h
05h n/a
06h 1131h
07h A101h
08h to 21h
0000h
22h 0000h
23h to FFh
0000h
Register name
Pointer register
Capability register (B-grade = 0017h, C-grade = 0015h)
Configuration register
Upper Boundary Alarm Trip register
Lower Boundary Alarm Trip register
Critical Alarm Trip register
Temperature register
Manufacturer ID register
Device ID/Revision register
reserved registers
SMBus register
reserved registers
A write to reserved registers my cause unexpected results which may result in requiring a
reset by removing and re-applying its power.
SE98_2
Product data sheet
Rev. 02 — 7 January 2008
© NXP B.V. 2008. All rights reserved.
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