Datasheet

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STM32H743xI Electrical characteristics
196
6.3.2 VCAP1/VCAP2/VCAP3 external capacitor
Stabilization for the main regulator is achieved by connecting an external capacitor C
EXT
to
the VCAP1/VCAP2/VCAP3 pins. C
EXT
is specified in Table 24. Two external capacitors can
be connected to VCAPx pins.
Figure 15. External capacitor C
EXT
1. Legend: ESR is the equivalent series resistance.
6.3.3 Operating conditions at power-up / power-down
Subject to general operating conditions for T
A
.
Table 25. Operating conditions at power-up / power-down (regulator ON)
4. For operation with voltage higher than Min (V
DD
, V
DDA
, V
DD33USB
) +0.3V, the internal Pull-up and Pull-Down resistors must
be disabled.
5. If T
A
is lower, higher P
D
values are allowed as long as T
J
does not exceed T
Jmax
(see Section 7.9: Thermal characteristics).
6. In low-power dissipation state, T
A
can be extended to this range as long as T
J
does not exceed T
Jmax
(see Section 7.9:
Thermal characteristics).
Table 24. VCAP1/VCAP2/VCAP3 operating conditions
(1)
1. When bypassing the voltage regulator, the two 2.2 µF V
CAP
capacitors are not required and should be
replaced by two 100 nF decoupling capacitors.
Symbol Parameter Conditions
CEXT Capacitance of external capacitor 2.2 µF
ESR ESR of external capacitor < 100 mΩ
MS19044V2
ESR
R
Leak
C
Symbol Parameter Min Max Unit
t
VDD
V
DD
rise time rate 0
∞
µs/V
V
DD
fall time rate 10
∞
t
VDDA
V
DDA
rise time rate 0
∞
V
DDA
fall time rate 10
∞
t
VDDUSB
V
DDUSB
rise time rate 0
∞
V
DDUSB
fall time rate 10
∞
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