Datasheet

DocID025644 Rev 3 111/135
STM32F401xD STM32F401xE Electrical characteristics
114
General PCB design guidelines
Power supply decoupling should be performed as shown in Figure 42 or Figure 43,
depending on whether V
REF+
is connected to V
DDA
or not. The 10 nF capacitors should be
ceramic (good quality). They should be placed them as close as possible to the chip.
Figure 42. Power supply and reference decoupling (V
REF+
not connected to V
DDA
)
1. V
REF+
and V
REF-
inputs are both available on UFBGA100. V
REF+
is also available on LQFP100. When
V
REF+
and V
REF-
are not available, they are internally connected to V
DDA
and V
SSA
.
Figure 43. Power supply and reference decoupling (V
REF+
connected to V
DDA
)
1. V
REF+
and V
REF-
inputs are both available on UFBGA100. V
REF+
is also available on LQFP100. When
V
REF+
and V
REF-
are not available, they are internally connected to V
DDA
and V
SSA
.
V
REF+
STM32F
V
DDA
V
SSA
/V
REF-
1 µF // 10 nF
1 µF // 10 nF
ai17535
(See note 1)
(See note 1)
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