ST72F321 STMICROELECTRONICS [STMicroelectronics], ST72F321 Datasheet - Page 173

• Manufacturer Part Number: ST72F321
• Description: 64/44-PIN 8-BIT MCU WITH 32 TO 60K FLASH/ROM, ADC, FIVE TIMERS, SPI, SCI, I2C INTERFACE
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

13.2 THERMAL CHARACTERISTICS
Notes:
1. The power dissipation is obtained from the formula P
and P
2. The average chip-junction temperature can be obtained from the formula T
PORT
Symbol
T
R
P
Jmax
thJA
is the port power dissipation determined by the user.
D
Package thermal resistance (junction to ambient)
Power dissipation
Maximum junction temperature
1)
Ratings
D
=P
2)
INT
+P
PORT
TQFP64 14x14
TQFP64 10x10
TQFP44 10x10
where P
J
= T
INT
A
is the chip internal power (I
+ P
D
x RthJA.
Value
150
500
47
50
52
ST72321
°C/W
DD
Unit
mW
173/189
°C
xV
DD
)