Datasheet

Package information STM32F334x4 STM32F334x6 STM32F334x8
116/121 DocID025409 Rev 8
7.6 Thermal characteristics
The maximum chip-junction temperature, T
J
max, in degrees Celsius, may be calculated
using the following equation:
T
J
max = T
A
max + (P
D
max x Θ
JA
)
Where:
• T
A
max is the maximum ambient temperature in ° C,
•Θ
JA
is the package junction-to-ambient thermal resistance, in ° C/W,
• P
D
max is the sum of P
INT
max and P
I/O
max (P
D
max = P
INT
max + P
I/O
max),
• P
INT
max is the product of I
DD
and V
DD
, expressed in Watts. This is the maximum chip
internal power.
P
I/O
max represents the maximum power dissipation on output pins where:
P
I/O
max = Σ (V
OL
× I
OL
) + Σ((V
DD
– V
OH
) × I
OH
),
taking into account the actual V
OL
/ I
OL
and V
OH
/ I
OH
of the I/Os at low and high level in the
application.
7.6.1 Reference document
JESD51-2 Integrated Circuits Thermal Test Method Environment Conditions - Natural
Convection (Still Air). Available at the www.jedec.org website.
7.6.2 Selecting the product temperature range
When ordering the microcontroller, the temperature range is specified in the ordering
information scheme shown in
Table 81: Ordering information scheme.
Each temperature range suffix corresponds to a specific guaranteed ambient temperature at
maximum dissipation and to a specific maximum junction temperature.
As applications do not commonly use the STM32F334x4/6/8 microcontroller at maximum
dissipation, it is useful to calculate the exact power consumption and junction temperature
to determine which temperature range is best suited to the application.
The following examples show how to calculate the temperature range needed for a given
application.
Table 80. Package thermal characteristics
Symbol Parameter Value Unit
Θ
JA
Thermal resistance junction-ambient
LQFP64 - 10 × 10 mm / 0.5 mm pitch
45
°C/W
Thermal resistance junction-ambient
LQFP48 - 7 × 7 mm / 0.5 mm pitch
55
Thermal resistance junction-ambient
LQFP32 - 7 × 7 mm / 0.8 mm pitch
60
Thermal resistance junction-ambient
WLCSP49 - 3.89 x 3.74 mm / 0.5 mm pitch
48.3
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