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ST7285C Datasheet(HTML) 87 Page - STMicroelectronics

Part No. ST7285C
Description  8-BIT MCU FOR RDS WITH 48K ROM, 3K RAM, ADC, TWO TIMERS, TWO SPIs, I2C AND SCI INTERFACES
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
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ST7285C Datasheet(HTML) 87 Page - STMicroelectronics

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ST7285C
6.2 POWER CONSIDERATIONS
The average chip-junction temperature, TJ, in de-
grees Celsius, may be calculated using the follow-
ing equation:
TJ =TA +(PD x θJA)(1)
Where:
–TA is the Ambient Temperature in°C,
θJ
A is the Package Junction-to-Ambient Thermal
Resistance, in
°C/W,
–PD is the sum of PINT and PI/O,
–PINT is the product of IDD and VDD, expressed in
Watts. This is the Chip Internal Power
–PI/O represents the Power Dissipation on Input
and Output Pins; User Determined.
For most applications PI/O<PINT and may be ne-
glected. PI/O may be significant if the device is con-
figured to drive Darlington bases or sink LED Loads.
An approximate relationship between PD and TJ
(if PI/O is neglected) is given by:
PD =K÷ (TJ + 273°C) (2)
Therefore:
K= PD x(TA +273°C) + θJA xPD
2 (3)
Where:
– K is a constant for the particular part, which may
be determined from equation (3) by measuring
PD (at equilibrium) for a known TA. Using this val-
ue of K, the values of PD and TJ may be obtained
by solving equations (1) and (2) iteratively for any
value of TA.
Table 13. Thermal Characteristics
Symbol
Package
Value
Unit
θJ
A
PQFP80
60
°C/W


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