Nxp Semiconductors OM11043 数据表
LPC1769_68_67_66_65_64_63
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Product data sheet
Rev. 9.5 — 24 June 2014
46 of 89
NXP Semiconductors
LPC1769/68/67/66/65/64/63
32-bit ARM Cortex-M3 microcontroller
10. Thermal characteristics
The average chip junction temperature, T
j
(
C), can be calculated using the following
equation:
(1)
•
T
amb
= ambient temperature (
C)
•
R
th(j-a)
= the package junction-to-ambient thermal resistance (
C/W)
•
P
D
= sum of internal and I/O power dissipation
The internal power dissipation is the product of I
DD
and V
DD
. The I/O power dissipation of
the I/O pins is often small and many times can be negligible. However it can be significant
in some applications.
in some applications.
Table 7.
Thermal resistance (
15 %)
Symbol Parameter
Conditions
Max/Min
Unit
LQFP100
R
th(j-a)
thermal resistance from
junction to ambient
junction to ambient
JEDEC (4.5 in
4 in); still air
38.01
C/W
Single-layer (4.5 in
3 in); still air 55.09
C/W
R
th(j-c)
thermal resistance from
junction to case
junction to case
9.065
C/W
TFBGA100
R
th(j-a)
thermal resistance from
junction to ambient
junction to ambient
JEDEC (4.5 in
4 in); still air
55.2
C/W
Single-layer (4.5 in
3 in); still air 45.6
C/W
R
th(j-c)
thermal resistance from
junction to case
junction to case
9.5
C/W
T
j
T
amb
P
D
R
th j
a
–
+
=