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LP3972 데이터시트(PDF) 51 Page - National Semiconductor (TI)

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부품명 LP3972
상세설명  Power Management Unit for Advanced Application Processors
PDF  59 Pages
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제조업체  NSC [National Semiconductor (TI)]
홈페이지  http://www.national.com
Logo NSC - National Semiconductor (TI)

LP3972 데이터시트(HTML) 51 Page - National Semiconductor (TI)

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LP3972 Controls (Continued)
THERMAL MANAGEMENT
Application: There is a mode wherein all 6 comparators
(flags) can be turned on via the “enallflags” control register
bit. This mode allows the user to interrogate the device or
system temperature under the set operating conditions.
Thus, the rate of temperature change can also be estimated.
The system may then negotiate for speed and power trade
off, or deploy cooling maneuvers to optimize system perfor-
mance. The “enallflags” bit needs enabled only when the
“bct<2:0> bits are read to conserve power.
Note: The thermal management flags have been verified
functional. Presently these registers are accessible by fac-
tory only. If there is a demand for this function, the relevant
register controls may be shifted into the user programmable
bank; the temperature range and resolution of these flags,
might also be refined/redefined.
THERMAL WARNING
2 of 6 low power comparators, each consumes less than 1
µA, are always enabled to operate the “T=125˚C warning
flag with hysteresis. This allows continuous monitoring of a
thermal-warning flag feature with very low power consump-
tion.
LP3972 THERMAL FLAGS FUNCTIONAL DIAGRAM,
DATA FROM INITIAL SILICON
The following functions are extra features from the thermal
shutdown circuit:
20207646
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