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參數(shù)資料
型號: SE98ATP,547
廠商: NXP Semiconductors
文件頁數(shù): 28/43頁
文件大小: 849K
描述: IC TEMP SENSOR DDR 8-HWSON
產(chǎn)品培訓模塊: I²C Bus Fundamentals
標準包裝: 1
功能: 溫度監(jiān)控系統(tǒng)(傳感器)
傳感器類型: 內(nèi)部
感應溫度: -40°C ~ 125°C
精確度: ±4°C(最小值)
拓撲: ADC(三角積分型),寄存器庫
輸出類型: I²C?/SMBus?
輸出警報:
輸出風扇:
電源電壓: 1.7 V ~ 3.6 V
工作溫度: -40°C ~ 125°C
安裝類型: 表面貼裝
封裝/外殼: 8-WFDFN 裸露焊盤
供應商設備封裝: 8-WSON
包裝: 標準包裝
產(chǎn)品目錄頁面: 847 (CN2011-ZH PDF)
其它名稱: 568-4731-6
SE98A_4
?NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 04  25 November 2009
28 of 43
NXP Semiconductors
SE98A
DDR memory module temp sensor, 1.7 V to 3.6 V
9.1  SE98A in memory module application
Figure 15
 shows the SE98A being placed in the memory module application with the
SPD. The SE98A is centered in the memory module to provide the function to monitor the
temperature of the DRAM. In the event of overheat, the SE98A triggers the EVENT
 output
and the memory controller can throttle the memory bus to slow the DRAM, or the CPU can
increase the refresh rate for the DRAM. The memory controller can also read the SE98A
and watch the DRAM thermal behavior.
 
9.2  Layout consideration
The SE98A does not require any additional components other than the host controller to
measure temperature. A 0.1 糉 bypass capacitor between the V
DD
 and V
SS
 pins is
located as close as possible to the power and ground pins for noise protection.
9.3  Thermal considerations
In general, self-heating is the result of power consumption and not a concern, especially
with the SE98A, which consumes very low power. In the event the SDA and EVENT
 pins
are heavily loaded with small pull-up resistor values, self-heating affects temperature
accuracy by approximately 0.5 癈.
Equation 1
 is the formula to calculate the effect of self-heating:
(1)
where:
擳 = T
j
 T
amb
T
j
 = junction temperature
T
amb
 = ambient temperature
R
th(j-a)
 = package thermal resistance
V
DD
 = supply voltage
I
DD(AV)
 = average supply current
V
OL(SDA)
 = LOW-level output voltage on pin SDA
V
OL(EVENT)
 = LOW-level output voltage on pin EVENT
Fig 15.   System application
002aad76
SE98A
EVENT
DIMM
DRAM
DRAM
DRAM
DRAM
MEMORY CONTROLLER
SMBus
CPU
SPD
SDA
SCL
?SPAN class="pst SE98ATP-547_2307474_14">T   R
th j-a
(    )
V
DD
I
DD AV
(    )
?/DIV>
(
)    V
OL SDA
(
)
I
OL
k
sin
(
) SDA
(
)
?/DIV>
(
)    V
OL EVENT
(
)
I
OL
k
sin
(
)EVENT
?/DIV>
(
)
+
+
[
]
?/DIV>
=
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SE98PW 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:SO-DIMM SMBus/I2C-bus temperature sensor
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SE98PW-T 功能描述:板上安裝溫度傳感器 I2C LOCAL +/- 2OC TS DIMM RoHS:否 制造商:Omron Electronics 輸出類型:Digital 配置: 準確性:+/- 1.5 C, +/- 3 C 溫度閾值: 數(shù)字輸出 - 總線接口:2-Wire, I2C, SMBus 電源電壓-最大:5.5 V 電源電壓-最小:4.5 V 最大工作溫度:+ 50 C 最小工作溫度:0 C 關閉: 安裝風格: 封裝 / 箱體: 設備功能:Temperature and Humidity Sensor
SE98TK 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:DDR memory module temp sensor, 3.3 V
SE98TK,118 功能描述:板上安裝溫度傳感器 I2C LOCAL +/- 2OC RoHS:否 制造商:Omron Electronics 輸出類型:Digital 配置: 準確性:+/- 1.5 C, +/- 3 C 溫度閾值: 數(shù)字輸出 - 總線接口:2-Wire, I2C, SMBus 電源電壓-最大:5.5 V 電源電壓-最小:4.5 V 最大工作溫度:+ 50 C 最小工作溫度:0 C 關閉: 安裝風格: 封裝 / 箱體: 設備功能:Temperature and Humidity Sensor
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