Datasheet

DS7147 Rev 10 97/103
STM8S003F3 STM8S003K3 Package information
97
10.4.2 Selecting the product temperature range
When ordering the microcontroller, the temperature range is specified in the order code (see
Figure 53: STM8S003F3/K3 value line ordering information scheme
(1)
).
The following example shows how to calculate the temperature range needed for a given
application.
Assuming the following application conditions:
• Maximum ambient temperature T
Amax
= 75 °C (measured according to JESD51-2)
• I
DDmax
= 8 mA, V
DD
= 5.0 V
• Maximum 20 I/Os used at the same time in output at low level with
I
OL
= 8 mA, V
OL
= 0.4 V
P
INTmax =
8 mA x 5.0 V = 400 mW
P
Dmax
= 400 mW + 64 mW
Thus: P
Dmax
= 464 mW
Using the values obtained in Section Table 55.: Thermal characteristics T
Jmax
is calculated
as follows for LQFP32 7 x 7 mm = 60 °C/W:
T
Jmax
= 75 °C + (60 °C/W x 464 mW) = 75 °C + 27.8 °C = 102.8 °C
This is within the range of the suffix 6 version parts (-40 < T
J
< 105 °C).
In this case, parts must be ordered at least with the temperature range suffix 6.