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STM8AF5268 bảng dữ liệu(PDF) 110 Page - STMicroelectronics

tên linh kiện STM8AF5268
Giải thích chi tiết về linh kiện  Automotive 8-bit MCU, with up to 128 Kbyte Flash, data EEPROM, 10-bit ADC, timers, LIN, CAN, USART, SPI, I2C, 3 to 5.5 V
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
Trang chủ  http://www.st.com
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STM8AF5268 bảng dữ liệu(HTML) 110 Page - STMicroelectronics

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STM8AF526x/8x/Ax STM8AF6269/8x/Ax
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DocID14395 Rev 15
11.6.2
Selecting the product temperature range
When ordering the microcontroller, the temperature range is specified in the order code (see
Figure 60: STM8AF526x/8x/Ax and STM8AF6269/8x/Ax ordering information scheme1 on
page 111).
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 0.4 V = 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 54: Thermal characteristics TJmax is calculated as
follows:
For LQFP64 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 C version parts (-40 °C < Tj < 125 ° C).
Parts must be ordered at least with the temperature range suffix C.



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