STM8S005C6T6 datasheet(97/103 Pages) STMICROELECTRONICS

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Thermal characteristics

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

Operating conditions

The maximum chip-junction temperature, TJmax, in degrees Celsius, may be calculated using

the following equation:

TJmax = TAmax + (PDmax x ΘJA)

Where:

• TAmax is the maximum ambient temperature in °C

• ΘJA 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 IDDandVDD, expressed in Watts. This is the maximum chip internal

power.

• PI/OmaxrepresentsthemaximumpowerdissipationonoutputpinsWhere:PI/Omax=Σ(VOL*IOL)

+ Σ((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.

Table 52: Thermal characteristics

(1)

Unit

Value

Parameter

Symbol

°C/W

Thermal resistance junction-ambient

LQFP 48 - 7 x 7 mm

ΘJA

°C/W

Thermal resistance junction-ambient

LQFP 32 - 7 x 7 mm

ΘJA

1. Thermal resistances are based on JEDEC JESD51-2 with 4-layer PCB in a natural

convection environment.

Reference document

11.1

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

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

Selecting the product temperature range

11.2

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:

• Maximum ambient temperature TAmaz = 82 °C (measured according to JESD51-2)

• IDDmax = 15 mA, VDD = 5.5 V

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Thermal characteristics

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