STR750FV2 datasheet(80/84 Pages) STMICROELECTRONICS

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Package characteristics

STR750Fxx STR751Fxx STR752Fxx STR755Fxx

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7.2.2

Selecting the product temperature range

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

Table 49: Order codes on page 81.

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

application.

Assuming the following application conditions:

Maximum ambient temperature TAmax= 82 °C (measured according to JESD51-2),

IDDmax=8 mA, VDD = 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 = 8 mA x 5 V= 400 mW

PIOmax = 20 x 8 mA x 0.4V = 64 mW

This gives: PINTmax= 400 mW and PIOmax 64 mW:

PDmax = 400 mW + 64 mW

Thus: PDmax = 464 mW

Using the values obtained in Table 48 TJmax is calculated as follows:

–

For LQFP100, 46°C/W

TJmax = 82° C + (46° C/W x 464 mW) = 82°C + 21°C = 103° C

This is within 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 6

(see Table 49: Order codes on page 81).

–

For BGA64, 58°C/W

TJmax = 82° C + (58° C/W x 464 mW) = 82°C + 27°C = 109° C

This is within the range of the suffix 7 version parts (-40 < TJ < 125° C).

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

(see Table 49: Order codes on page 81).

Figure 50.

LQFP100 PDmax vs TA

100

200

300

400

500

600

700

TA (° C)

Suffix 6

Suffix 7

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