RX Family
Hardware Design Guide
R01AN1411EJ0110 Rev.1.10
Page 11 of 32
Oct.26.21
2.2.1 Two-Layer Board
•
Use the GND wiring pattern to form a guard for the portion of the back side between the VCL pin and the
capacitor.
•
Make connections to GND via at least four through holes.
•
Make the GND wiring traces as wide as possible.
Figure 2.6 shows an example VCL pin wiring pattern on a two-layer board.
C
Capacitor
VCL
VSS
C
Front side
wiring pattern
Back side
wiring pattern
a
b
a
and
b
≤ 8 mm (4 mm if
possible)
When
a
and
b
> 8 mm,
ensure parasitic resistance
for
a
and
b
is less than 1
Ω.
Through hole
VBAT
Layer under
VCL is GND.
Four or more
through holes
Figure 2.6 Example VCL Pin Wiring Pattern on Two-Layer Board
