STM8S105C4B3 STMICROELECTRONICS [STMicroelectronics], STM8S105C4B3 Datasheet - Page 116

• Manufacturer Part Number: STM8S105C4B3
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

Package characteristics
11.3.1
11.3.2
116/127
1. Thermal resistances are based on JEDEC JESD51-2 with 4-layer PCB in a natural
Reference document
JESD51-2 integrated circuits thermal test method environment conditions - natural convection
(still air). Available from www.jedec.org.
Selecting the product temperature range
When ordering the microcontroller, the temperature range is specified in the order code.
The following example shows how to calculate the temperature range needed for a given
application.
Assuming the following application conditions:
•
•
•
•
•
T
T
This is within the range of the suffix 6 version parts (-40 < T
must be ordered at least with the temperature range suffix 6.
Symbol
Θ
Θ
Jmax
Jmax
JA
JA
convection environment.
Maximum ambient temperature T
I
Maximum 8 standard I/Os used at the same time in output at low level with I
V
Maximum 4 high sink I/Os used at the same time in output at low level with I
V
Maximum 2 true open drain I/Os used at the same time in output at low level with I
20 mA, V
P
P
This gives: P
P
Thus: P
DDmax
OL
OL
INTmax
IOmax
Dmax
for LQFP32 can be calculated as follows, using the thermal resistance Θ
= 75° C + (59° C/W x 464 mW) = 75°C + 27°C = 102° C
= 2 V
= 1.5 V
= 82.5 mW + 360 mW
= 15 mA, V
= (10 mA x 2 V x 8 )+(20 mA x 2 V x 2)+(20 mA x 1.5 V x 4) = 360 mW
Dmax
= 15 mA x 5.5 V = 82.5 mW
OL
= 2 V
Parameter
= 443 mW
Thermal resistance junction-ambient
LQFP 32 - 7 x 7 mm
Thermal resistance junction-ambient
VQFPN 32 - 5 x 5 mm
INTmax
DD
= 82.5 mW and P
= 5.5 V
DocID14771 Rev 9
Amaz
IOmax
= 82 °C (measured according to JESD51-2)
360 mW:
J
< 106° C). In this case, parts
Value
60
22
STM8S105xx
JA
OL
OL
:
= 10 mA,
= 20 mA,
Unit
°C/W
°C/W
OL
=