STM32F101V8 datasheet(91/101 Pages) STMICROELECTRONICS

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STM32F101x8, STM32F101xB

Package characteristics

100

6.7.2

Evaluating the maximum junction temperature for an application

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

information scheme shown in Table 52: Ordering information scheme.

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

maximum dissipation and, to a specific maximum junction temperature. Here, only

temperature range 6 is available (–40 to 85 °C).

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

application, making it possible to check whether the required temperature range is

compatible with the STM32F101xx junction temperature range.

Example: 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

mode 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

Thus: PDmax = 447 mW

Using the values obtained in Table 51 TJmax is calculated as follows:

–

For LQFP64, 45 °C/W

TJmax = 82 °C + (45 °C/W × 447 mW) = 82 °C + 20.1 °C = 102.1 °C

This is within the junction temperature range of the STM32F101xx (–40 < TJ < 105 °C).

Figure 52. LQFP64 PD max vs. TA

100

200

300

400

500

600

700

105

115

TA (°C)

Suffix 6

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