Information

Electrical characteristics STM32F20xxx
72/178 DocID15818 Rev 11
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.
ai18748b
0
1
2
3
4
5
6
7
8
0 4 8
12 16 20 24 28 32 36 40 44 48 52 56 60 64 68 72 76 80 84 88 92 96
100 104 108 112 116 120
Number of Wait states
Fcpu (MHz)
Wait states vs Fcpu and VDD range
1.8 to 2.1V
2.1 to 2.4V
2.4 to 2.7V
2.7 to 3.6V
Table 16. VCAP1/VCAP2 operating conditions
(1)
Symbol Parameter Conditions
CEXT Capacitance of external capacitor 2.2 µF
ESR ESR of external capacitor < 2 Ω
MS19044V2
ESR
R
Leak
C