STM32G031F6 datasheet(114/117 Pages) STMICROELECTRONICS

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STM32G031x4/x6/x8

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DS12992 Rev 2

As applications do not commonly use microcontrollers at their maximum power

consumption, it is useful to calculate the exact power consumption and junction temperature

to determine which temperature range best suits the application.

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

application.

Example:

Assuming the following worst application conditions:

•

ambient temperature TA = 50 °C (measured according to JESD51-2)

•

IDD = 50 mA; VDD = 3.6 V

•

20 I/Os simultaneously used as output at low level with IOL = 8 mA (VOL= 0.4 V), and

•

8 I/Os simultaneously used as output at low level with IOL = 20 mA (VOL= 1.3 V),

the power consumption from power supply PINT is:

PINT = 50 mA × 3.6 V= 118 mW,

the power loss through I/Os PIO is

PIO = 20 × 8 mA × 0.4 V + 8 × 20 mA × 1.3 V = 272 mW,

and the total power PD to dissipate is:

PD = 180 mW + 272 mW = 452 mW

For product in LQFP48 with ΘJA= 75°C/W, the junction temperature stabilizes at:

TJ = 50°C + (75°C/W × 452 mW) = 50 °C + 33.9 °C = 83.9°C

As a conclusion, product version with suffix 6 (maximum allowed TJ = 105° C) is sufficient

for this application.

If the same application was used in a hot environment with maximum TA greater than 71°C,

the junction temperature would exceed 105°C and the product version allowing higher

maximum TJ would have to be ordered.

STM32G031F6 Datasheet(PDF) 114 Page - STMicroelectronics