Datasheet

DS6329 Rev 16 75/184
STM32F20xxx Electrical characteristics
183
Figure 21. Number of wait states versus f
CPU
and V
DD
range
1. The supply voltage can drop to 1.7 V when the device operates in the 0 to 70 °C temperature range and
IRROFF is set to V
DD
.
6.3.2 VCAP1/VCAP2 external capacitor
Stabilization for the main regulator is achieved by connecting an external capacitor to the
VCAP1/VCAP2 pins. C
EXT
is specified in Table 16.
Figure 22. External capacitor C
EXT
1. Legend: ESR is the equivalent series resistance.
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Table 16. VCAP1/VCAP2 operating conditions
(1)
1. When bypassing the voltage regulator, the two 2.2 µF V
CAP
capacitors are not required and must be
replaced by two 100 nF decoupling capacitors.
Symbol Parameter Conditions
CEXT Capacitance of external capacitor 2.2 µF
ESR ESR of external capacitor < 2 Ω
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