Selecting the product temperature range

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

　　Figure 49: STM8S207xx/208xx performance line ordering information scheme(1) on

　　page 100).

　　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= 15 mA, VDD= 5.5 V

　　<

　　Maximum eight standard I/Os used at the same time in output at low level with IOL= 10

　　mA, VOL= 2 V

　　<

　　Maximum four high sink I/Os used at the same time in output at low level with IOL= 20

　　mA, VOL= 1.5 V

　　<

　　Maximum two true open drain I/Os used at the same time in output at low level with

　　IOL= 20 mA, VOL= 2 V

　　PINTmax =15 mA x 5.5 V = 82.5 mW

　　PIOmax =(10 mA x 2 V x 8 ) + (20 mA x 2 V x 2) + (20 mA x 1.5 V x 4) = 360 mW

　　This gives: PINTmax= 82.5 mW and PIOmax360 mW:

　　PDmax= 82.5 mW + 360 mW

　　Thus: PDmax= 443 mW

　　Using the values obtained in Table 57: Thermal characteristics on page 96 TJmaxis

　　calculated as follows for LQFP64 10 x 10 mm = 46 °C/W:

　　TJmax= 82 °C + (46 °C/W x 443 mW) = 82 °C + 20 °C = 102 °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