Datasheet

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STM8S001J3 Package information
79
10.2.1 Reference document
JESD51-2 integrated circuits thermal test method environment conditions - natural
convection (still air). Available from www.jedec.org.
10.2.2 Selecting the product temperature range
When ordering the microcontroller, the temperature range is specified in the order code (see
Figure 40: STM8S001J3 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 4 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 = 40 mW
P
Dmax
= 40 mW + (8 x 0.4 x 4) mW
Thus: P
Dmax
= 52.8 mW
Using the values obtained in Section Table 49.: Thermal characteristics T
Jmax
is calculated
as follows for SO8N package 102 °C/W :
T
Jmax
= 75 °C + (102 °C/W x 52.8 mW) = 75 °C + 5.4 °C = 80.4 °C.
Above information is within the range (-40 < T
J
< 130 °C)
Table 49. Thermal characteristics
(1)
1. Thermal resistances are based on JEDEC JESD51-2 with 4-layer PCB in a natural convection
environment.
Symbol Parameter Value Unit
Θ
JA
Thermal resistance junction-ambient
SO8N
102 °C/W
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