參數(shù)資料
型號(hào)： LM40
廠商： National Semiconductor Corporation
英文描述： Hardware Monitor with Dual Thermal Diodes and SensorPath Bus
中文描述： 硬件監(jiān)控雙熱二極管和SensorPath總線
文件頁數(shù)： 7/27頁
文件大小： 369K
代理商： LM40
PIN
#
Pin
Name
Pin
Circuit
All Input Structure Circuits
1
NC
A
Circuit A
Circuit C
Circuit B
Circuit D
2
GND
B
3
V+/
3.3V SB
B
4
SWD
A
5
ADD
A
6
+1.2V
C
7
+2.5V
C
8
D1-
D
9
D1+
E
10
D2-
D
11
D2+
E
Circuit E
12
+5V
C
13
+12V
C
14
NC
A
Note 4:
Thermal resistance junction-to-ambient in still air when attached to a printed circuit board with 1 oz. foil is 148 C/W.
Note 5:
Human body model, 100 pF discharged through a 1.5 k
resistor. Machine model, 200 pF discharged directly into each pin.
Note 6:
Reflow temperature profiles are different for lead-free and non lead-free packages.
Note 7:
“Typicals” are at T
A
= 25C and represent most likely parametric norm. They are to be used as general reference values not for critical design calculations.
Note 8:
Limits are guaranteed to National’s AOQL (Average Outgoing Quality Level).
Note 9:
The supply current will not increase substantially with a SensorPath transaction.
Note 10:
Local temperature accuracy does not include the effects of self-heating. The rise in temperature due to self-heating is the product of the internal power
dissipation of the LM40 and the thermal resistance. See (Note 4) for the thermal resistance to be used in the self-heating calculation.
Note 11:
TUE , total unadjusted error, includes ADC gain, offset, linearity and reference errors. TUE is defined as the "actual Vin" to achieve a given code transition
minus the "theoretical Vin" for the same code. Therefore, a positive error indicates that the input voltage is greater than the theoretical input voltage for a given code.
If the theoretical input voltage was applied to an LM40 that has positive error, the LM40’s reading would be less than the theoretical.
Note 12:
The accuracy of the LM40CIMT is guaranteed when using the thermal diode of an Intel 90 nm Pentium 4 processor or any thermal diode with a non-ideality
factor of 1.011 and series resistance of 3.33
. When using a MMBT3904 type transistor as a thermal diode the error band will be typically shifted by -4.5 C.
Note 13:
This specification is provided only to indicate how often temperature and voltage data are updated.
Note 14:
The output fall time is measured from (V
IH min
) to (V
IL max
).
Note 15:
The output rise time is measured from (V
IL max
) to (V
IH min
).
Note 16:
The rise and fall times are not tested but guaranteed by design.
L
www.national.com
7
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