STM32G071C8 datasheet(130/133 Pages) STMICROELECTRONICS

130 / 133 page

STM32G071x8/xB

130/133

DS12232 Rev 3

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.

STM32G071C8 Datasheet(PDF) 130 Page - STMicroelectronics