STM8AF6213 datasheet(98/106 Pages) STMICROELECTRONICS

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STM8AF6213/23/23A/26

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10.3

Thermal characteristics

The maximum chip junction temperature (TJmax) must never exceed the values given in

Table 26: General operating conditions

TJmax, in degrees Celsius, may be calculated using the following equation:

TJmax = TAmax + (PDmax x JA)

Where:

–TAmax is the maximum ambient temperature in C

–

JA is the package junction-to-ambient thermal resistance in C/W

–PDmax is the sum of PINTmax and PI/Omax (PDmax = PINTmax + PI/Omax)

–PINTmax is the product of IDD and VDD, expressed in Watts. This is the maximum

chip internal power.

–PI/Omax represents the maximum power dissipation on output pins

Where:



PI/Omax = (VOL*IOL) + ((VDD-VOH)*IOH), 

taking into account the actual VOL/IOL and VOH/IOH of the I/Os at low and high level

in the application.

10.3.1

Reference document

JESD51-2 integrated circuits thermal test method environment conditions - natural

convection (still air). Available from www.jedec.org.

10.3.2

Selecting the product temperature range

When ordering the microcontroller, the temperature range is specified in the order code (see

Section 11: Ordering information

The following example shows how to calculate the temperature range needed for a given

application.

Table 63. 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

JA

Thermal resistance junction-ambient



TSSOP20 - 4 x 4 mm

110

°C/W

Thermal resistance junction-ambient



LQFP 32 - 7 x 7 mm

°C/W

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