STM32F050C4 datasheet(94/97 Pages) STMICROELECTRONICS

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STM32F050xx

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Doc ID 023683 Rev 1

Example 1: High-performance application

Assuming the following application conditions:

Maximum ambient temperature TAmax = 80 °C (measured according to JESD51-2),

IDDmax = 50 mA, VDD = 3.5 V, maximum 20 I/Os used at the same time in output at low

level with IOL = 8 mA, VOL= 0.4 V and maximum 8 I/Os used at the same time in output

at low level with IOL = 20 mA, VOL= 1.3 V

PINTmax = 50 mA × 3.5 V= 175 mW

PIOmax = 20 × 8 mA × 0.4 V + 8 × 20 mA × 1.3 V = 272 mW

This gives: PINTmax = 175 mW and PIOmax = 272 mW:

PDmax = 175 + 272 = 447 mW

Using the values obtained in Table 65 TJmax is calculated as follows:

–

For LQFP48, 55 °C/W

TJmax = 80 °C + (55°C/W × 447 mW) = 80 °C + 24.585 °C = 104.585 °C

This is within the range of the suffix 6 version parts (–40 < TJ < 105 °C) see Table 15:

General operating conditions on page 39.

In this case, parts must be ordered at least with the temperature range suffix 6 (see

Section 8: Part numbering).

Note:

With this given PDmax we can find the TAmax allowed for a given device temperature range

(order code suffix 6 or 7).

Suffix 6: TAmax = TJmax - (55°C/W × 447 mW) = 105-24.585 = 80.415 °C

Suffix 7: TAmax = TJmax - (55°C/W × 447 mW) = 125-24.585 = 100.415 °C

Example 2: High-temperature application

Using the same rules, it is possible to address applications that run at high ambient

temperatures with a low dissipation, as long as junction temperature TJ remains within the

specified range.

Assuming the following application conditions:

Maximum ambient temperature TAmax = 100 °C (measured according to JESD51-2),

IDDmax = 20 mA, VDD = 3.5 V, maximum 20 I/Os used at the same time in output at low

level with IOL = 8 mA, VOL= 0.4 V

PINTmax = 20 mA × 3.5 V= 70 mW

PIOmax = 20 × 8 mA × 0.4 V = 64 mW

This gives: PINTmax = 70 mW and PIOmax = 64 mW:

PDmax = 70 + 64 = 134 mW

Thus: PDmax = 134 mW

Using the values obtained in Table 65 TJmax is calculated as follows:

–

For LQFP48, 55 °C/W

TJmax = 100 °C + (55 °C/W × 134 mW) = 100 °C + 7.37 °C = 107.37 °C

This is above the range of the suffix 6 version parts (–40 < TJ < 105 °C).

In this case, parts must be ordered at least with the temperature range suffix 7 (see

Section 8: Part numbering) unless we reduce the power dissipation in order to be able to

use suffix 6 parts.

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