ST10F296 datasheet(294/346 Pages) STMICROELECTRONICS

294 / 346 page

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Electrical characteristics

ST10F296E

294/346

Solving Equation 22 and Equation 23 gives Equation 24:

Equation 24

Where:

K is a constant for the particular part, which may be determined from Equation 24 by

measuring PD (at equilibrium) for a known TA. Using this value of K, the values of PD and TJ

may be obtained by solving Equation 22 and Equation 23 iteratively for any value of TA.

Based on thermal characteristics of the package and with reference to the power

consumption values provided in Table 163: DC characteristics and Figure 97: Supply current

versus the operating frequency (run and idle modes)), the product classification in Table 162

is suggested. The exact power consumption of the device inside the application must be

computed according to different working conditions, thermal profiles, real thermal resistance

of the system (including the printed circuit board or other substrata), I/O activity, and so on.

24.4

Parameter interpretation

The parameters listed in Table 163: DC characteristics represent characteristics of the

ST10F296E and its demands on the system.

Where the ST10F296E logic provides signals with their respective timing characteristics, the

symbol for controller characteristics (CC) is included in the ‘Symbol’ column. Where the

external system must provide signals with their respective timing characteristics to the

ST10F296E, the symbol for system requirement (SR) is included in the ‘Symbol’ column.

Table 161.

Thermal characteristics

Symbol

Description

Value (typical)

Unit

ΘJA

Thermal resistance junction-ambient

PBGA 208 package (23 x 23 x 1.96 mm)

° C/W

Table 162.

Package characteristics

Package

Ambient temperature range

CPU frequency range

PBGA 208

-40 to 125 °C

1 to 64 MHz

273

° C

() Θ

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