Notes On Placement Of Peripheral Components - Renesas R-IN32M4-CL2 User Manual

R-IN32M4-CL2 User's Manual: Board design edition
4.2

Notes on Placement of Peripheral Components

The 0.1-µF ceramic capacitor (C1) should be placed immediately close to R-IN32M4-CL2 (in the immediate vicinity of
the pin).
Figure 4.2 is a schematic view from below the board.
In addition, the wiring patterns for the electrolytic capacitor (C2) and ferrite beads running parallel to other signal lines
should be avoided.
Pay particular attention to the effects of
noise from signals with wiring running
parallel to these lines in this region.
PLL_
VDD
PLL_
C1
GND
Figure 4.2 Schematic View from Below the Board
Caution: PLL_VDD and PLL_GND lines should be as short and thick as possible in PCB wiring.
Longer wiring leads to stronger crosstalk because the LC components of the wiring increase,
more readily leading to effects.
R18UZ0046EJ0200
Dec. 28, 2018
4. PLL Power Supply Pins
C2
Power supply
FB
FB
GND
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