STM8AP6268TCU View Datasheet(PDF) - STMicroelectronics

Part Name

Description

MFG CO.

STM8AP6268TCU

Automotive 8-bit MCU, with up to32 Kbytes Flash, data EEPROM, 10-bit ADC, timers, LIN, SPI, I2C, 3 to 5.5V

STMicroelectronics 

Electrical characteristics

STM8AF61xx, STM8AF62xx

10.4.1

10.4.2

Table 48. Thermal characteristics(1)

Symbol

Parameter

Value

ΘJA

Thermal resistance junction-ambient

LQFP 48 - 7 x 7 mm

57

ΘJA

Thermal resistance junction-ambient

LQFP 32 - 7 x 7 mm

59

ΘJA

Thermal resistance junction-ambient

VFQFPN32

25

1. Thermal resistances are based on JEDEC JESD51-2 with 4-layer PCB in a natural convection

environment.

Unit

°C/W

°C/W

°C/W

Reference document

JESD51-2 integrated circuits thermal test method environment conditions - natural

convection (still air). Available from www.jedec.org.

Selecting the product temperature range

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

Section 12: Ordering information).

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 = 14 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 = 14 mA x 5 V= 70 mW

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

This gives: PINTmax = 70 mW and PIOmax 64 mW:

PDmax = 70 mW + 64 mW

Thus: PDmax = 134 mW.

Using the values obtained in Table 48: Thermal characteristics on page 74 TJmax is

calculated as follows:

For LQFP64 46 °C/W

TJmax = 82 °C + (46 °C/W x 134 mW) = 82 °C + 6 °C = 88 °C

This is within the range of the suffix B version parts (-40 < TJ < 105 °C).

Parts must be ordered at least with the temperature range suffix B.

74/89

Doc ID 14952 Rev 6

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