SE98A datasheet(28/43 Pages) NXP

部件名	SE98A

功能描述	DDR memory module temp sensor, 1.7 V to 3.6 V

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制造商	NXP [NXP Semiconductors]

网页	http://www.nxp.com

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28 / 43 page

SE98A_4

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

μF bypass capacitor between the V

DD and VSS 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

°C.

Equation 1 is the formula to calculate the effect of self-heating:

(1)

where:

ΔT = T

j − Tamb

Tj = junction temperature

Tamb = ambient temperature

Rth(j-a) = package thermal resistance

VDD = supply voltage

IDD(AV) = average supply current

VOL(SDA) = LOW-level output voltage on pin SDA

VOL(EVENT) = LOW-level output voltage on pin EVENT

Fig 15. System application

002aad760

SE98A

EVENT

DIMM

DRAM

MEMORY CONTROLLER

SMBus

CPU

SPD

SDA

SCL

ΔTR

th j-a

()

V

DD

I

DD AV

()

×

()

V

OL SDA

()

I

OL

k

sin

() SDA

()

×

()

V

OL EVENT

()

I

OL

k

sin

()EVENT

×

()

++

[

]

×

=

类似零件编号 - SE98A

制造商	部件名	数据表	功能描述
NXP Semiconductors	SE98A	227Kb / 43P	DDR memory module temp sensor, 1.7 V to 3.6 V Rev. 02-6 August 2009
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	SE98ATP	227Kb / 43P	DDR memory module temp sensor, 1.7 V to 3.6 V Rev. 02-6 August 2009

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类似说明 - SE98A

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