Built-In Regulator Pin (R-In32M3-Ec Only); Built-In Regulator Used; Figure 5.1 Wiring Example Of The Regulator Unit (Built-In Regulator Used) - Renesas R-IN32M3 Series User Manual

R-IN32M3 Series: Board design edition
5.

Built-in Regulator Pin (R-IN32M3-EC only)

In the R-IN32M3-EC, supplying 1.5 V to the VDD15, VDDAPLL, and PxVDDARXTX (x = 0, 1) pins is required as an
internal power supply for Ethernet PHY.
Since the R-IN32M3-EC is equipped with a regulator, there is no need to generate power externally. When not using a
built-in regulator, see section 6.2, Built-in Regulator Unused and design.
5.1

Built-in Regulator Used

Make wiring and layout as follows at the time of the built-in regulator in use.
R-IN32M3-EC
Switchi ng regulator inpu t
Switchi ng regulator inpu t
Regula tor output 1.5 V
GND for switching regul ato r
Feedba ck regula tor
Sup ply 1.5 V input

Figure 5.1 Wiring Example of the Regulator Unit (Built-in Regulator Used)

If tantalum capacitors are not available, it is possible to use a resistor and a ceramic capacitor for C1, and a ceramic
capacitor for C2.
C1
(22 uF,
Tantalum)
R18UZ0021EJ0400
Dec. 28, 2018
AVDD_REG
BVDD
LX
D1
BGND /
AGND_REG
FB
VDD15
TEST1
TEST2
TEST3
R
(100mΩ)
C1a
(22 uF,
Ceramic)
5. Built-in Regulator Pin (R-IN32M3-EC only)
VDD33 (3.3 V)
+
C2
L1 (10 uH)
(22uF; Tantalum)
+
C1
(22uF;
Tantalum)
C2
(22 uF,
Tantalum)
C2a
(22 uF,
Ceramic)
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