STM32WB15CC datasheet(123/127 Pages) STMICROELECTRONICS

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DS13258 Rev 4

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STM32WB15CC

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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 device at maximum dissipation, it is useful to

calculate the exact power consumption and junction temperature to determine the

temperature range that best suits 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 TA max = 82 °C (measured according to JESD51-2),

IDD max = 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

PINT max = 50 mA × 3.5 V = 175 mW

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

This gives: PINT max = 175 mW and PIO max = 272 mW

PD max = 175 + 272 = 447 mW

Using the values obtained in Table 86 TJ max is calculated as follows:

–

For UFQFPN48, 27.7 °C / W

TJ max = 82 °C + (27.7 °C / W × 447 mW) = 82 °C + 12 °C = 94 °C

This is within the range of the suffix 6 version parts (–40 < TJ < 105 °C), see Section 8.

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

Note:

With this given PD max user can find the TA max allowed for a given device temperature

range (order code suffix 7).

Suffix 7: TA max = TJ max - (27.7 C / W × 447 mW) = 125 °C - 12 °C = 113 °C

Example 2: High-temperature application

Using the same rules, it is possible to address applications running 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 TA max = 102 °C (measured according to JESD51-2),

IDD max = 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

PINT max = 20 mA × 3.5 V = 70 mW

PIO max = 20 × 8 mA × 0.4 V = 64 mW

This gives: PINTmax = 70 mW and PIO max = 64 mW

PD max = 70 + 64 = 134 mW

Thus: PD max = 134 mW

Using the values obtained in Table 86 TJ max is calculated as follows:

–

For UFQFPN48, 27.7 °C / W

TJ max = 102 °C + (27.7 °C / W × 134 mW) = 102 °C + 4 °C = 106 °C

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