STM32F050K6U6 Datasheet, PDF (93/97 Pages) STMicroelectronics – Low- and medium-density advanced ARM™-based 32-bit MCU with up to 32 Kbytes Flash, timers, ADC and comm. interfaces

STM32F050xx
Package characteristics
7.2
Thermal characteristics
The maximum chip junction temperature (T_Jmax) must never exceed the values given in
Table 15: General operating conditions on page 39.
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/Omax),
● 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.
Table 65. Package thermal characteristics
Symbol
Parameter
Thermal resistance junction-ambient
LQFP48 - 7 × 7 mm
Thermal resistance junction-ambient
UFQFPN32 - 5 × 5 mm
Θ_JA
Thermal resistance junction-ambient
UFQFPN28 - 4 × 4 mm
Thermal resistance junction-ambient
TSSOP20
Value
55
38
118
110
Unit
°C/W
7.2.1
7.2.2
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 ordering
information scheme shown in Section 8: Part numbering.
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 STM32F05xx at maximum dissipation, it is useful
to calculate the exact power consumption and junction temperature to determine which
temperature range will be best suited to the application.
The following examples show how to calculate the temperature range needed for a given
application.
Doc ID 023683 Rev 1
93/97