STMicroelectronics STM32F050G6 Manual page 94

Package characteristics
The following examples show how to calculate the temperature range needed for a given
application.
Example 1: High-performance application
Assuming the following application conditions:
Maximum ambient temperature T
I
DDmax
level with I
at low level with I
P
INTmax
P
IOmax
This gives: P
P
Dmax
Using the values obtained in
–
T
Jmax
This is within the range of the suffix 6 version parts (–40 < T
General operating conditions on page
In this case, parts must be ordered at least with the temperature range suffix 6 (see
Section 8: Part
Note: With this given P
(order code suffix 6 or 7).
Suffix 6: T
Suffix 7: T
Example 2: High-temperature application
Using the same rules, it is possible to address applications that run at high ambient
temperatures with a low dissipation, as long as junction temperature T
specified range.
Assuming the following application conditions:
Maximum ambient temperature T
I
DDmax
level with I
P
INTmax
P
IOmax
This gives: P
P
Dmax
Thus: P
Dmax
Using the values obtained in
–
T
Jmax
This is above the range of the suffix 6 version parts (–40 < T
94/98
= 50 mA, V = 3.5 V, maximum 20 I/Os used at the same time in output at low
DD
= 8 mA, V = 0.4 V and maximum 8 I/Os used at the same time in output
OL OL
= 20 mA, V
OL
= 50 mA × 3.5 V= 175 mW
= 20 × 8 mA × 0.4 V + 8 × 20 mA × 1.3 V = 272 mW
= 175 mW and P
INTmax
= 175 + 272 = 447 mW
Table 66
For LQFP48, 55 °C/W
= 80 °C + (55°C/W × 447 mW) = 80 °C + 24.585 °C = 104.585 °C
numbering).
we can find the T
Dmax
= T - (55°C/W × 447 mW) = 105-24.585 = 80.415 °C
Amax Jmax
= T - (55°C/W × 447 mW) = 125-24.585 = 100.415 °C
Amax Jmax
= 20 mA, V = 3.5 V, maximum 20 I/Os used at the same time in output at low
DD
= 8 mA, V = 0.4 V
OL OL
= 20 mA × 3.5 V= 70 mW
= 20 × 8 mA × 0.4 V = 64 mW
= 70 mW and P
INTmax
= 70 + 64 = 134 mW
= 134 mW
Table 66
For LQFP48, 55 °C/W
= 100 °C + (55 °C/W × 134 mW) = 100 °C + 7.37 °C = 107.37 °C
Doc ID 023079 Rev 3
= 80 °C (measured according to JESD51-2),
Amax
= 1.3 V
OL
= 272 mW:
IOmax
T is calculated as follows:
Jmax
39.
allowed for a given device temperature range
Amax
= 100 °C (measured according to JESD51-2),
Amax
= 64 mW:
IOmax
T is calculated as follows:
Jmax
STM32F050xx
< 105 °C) see Table 15:
J
remains within the
J
< 105 °C).
J