STM32F051K4U6 datasheet(100/104 Pages) STMICROELECTRONICS

100 / 104 page

STM32F051x

Package characteristics

Doc ID 022265 Rev 3

101/105

7.2.1

Reference document

JESD51-2 Integrated Circuits Thermal Test Method Environment Conditions - Natural

Convection (Still Air). Available from www.jedec.org

7.2.2

Selecting the product temperature range

When ordering the microcontroller, the temperature range is specified in the ordering

information scheme shown in Section 8: Part numbering.

Each temperature range suffix corresponds to a specific guaranteed ambient temperature at

maximum dissipation and, to a specific maximum junction temperature.

As applications do not commonly use the STM32F05xx at maximum dissipation, it is useful

to calculate the exact power consumption and junction temperature to determine which

temperature range will be best suited to the application.

The following examples show how to calculate the temperature range needed for a given

application.

Example 1: High-performance application

Assuming the following application conditions:

Maximum ambient temperature TAmax = 82 °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 72 TJmax is calculated as follows:

–

For LQFP64, 45 °C/W

TJmax = 82 °C + (45 °C/W × 447 mW) = 82 °C + 20.115 °C = 102.115 °C

This is within the range of the suffix 6 version parts (–40 < TJ < 105 °C) see Table 20:

General operating conditions.

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

Section 8: Part numbering).

Table 72.

Package thermal characteristics

Symbol

Parameter

Value

Unit

ΘJA

Thermal resistance junction-ambient

LQFP64 - 10 × 10 mm / 0.5 mm pitch

°C/W

Thermal resistance junction-ambient

LQFP48 - 7 × 7 mm

Thermal resistance junction-ambient

LQFP32 - 7 × 7 mm

Thermal resistance junction-ambient

UFQFPN32 - 5 × 5 mm

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