5-V Built-In Regulator Peripheral Circuit Configuration; Peripheral Connection Configuration With 2.5-V Built-In Regulator; Peripheral Connection Configuration Without 2.5-V Built-In Regulator; Figure 7.1 Peripheral Connection Configuration With 2.5-V Built-In Regulator - Renesas R-IN32M4-CL3 User Manual

R-IN32M4-CL3 User's Manual: Board design edition
7.

2.5-V built-in Regulator Peripheral Circuit Configuration

This section describes the peripheral circuit configuration of the 2.5-V built-in regulator installed in R-IN32M4-CL3.
7.1

Peripheral Connection Configuration with 2.5-V built-in Regulator

This figure shows a peripheral connection configuration with the 2.5-V built-in regulator.
Other 3.3-V Input
R-IN32M4-CL3 3.3 V Input
V = 3.3 V
DD
Select a power supply
smoothing capacitor
according to each board.
C C
IN
= 47 µF
Place this
capacitor
as close to the
AVDDREG_33
pin as possible.

Figure 7.1 Peripheral Connection Configuration with 2.5-V built-in Regulator

7.2

Peripheral Connection Configuration without 2.5-V built-in Regulator

This figure shows a peripheral connection configuration without the 2.5-V built-in regulator.
Select a power supply
smoothing capacitor
according to each board.

Figure 7.2 Peripheral Connection Configuration without 2.5-V built-in Regulator

R18UZ0074EJ0100
Dec 24, 2019
2.5-V built-in Regulator Part
VDDREG_33
AVDDREG_33
AGND
C C
BYPASS BYPASS
= 0.1 µF = 0.01 µF
Place this Place this
capacitor capacitor
close to the close to the
AVDDREG_33 VDDREG_33
pin. pin.
GND
Other 3.3-V Input
R-IN32M4-CL3 3.3 V Input
V = 3.3 V
DD
C
7. 2.5-V built-in Regulator Peripheral Circuit Configuration
V = 2.5 V
REG
REG_FB
L = 4.7 µH
REG_OUT
AGND
Schottky
barrier
C
OUT
diode
(SBD)
Place these SBD, L, and C
OUT
AGND
close to the REG_OUT pin.
With increasing VDD25A load current, the undershoot voltage increases and
2.5-V potential after smoothing rises.
To avoid it, the undershooting has to suppress by SBD.
2.5-V built-in Regulator Part
VDDREG_33
REG_FB
AVDDREG_33
REG_OUT
AGND AGND
AGND or GND
GND
Bypass-capacitors for
the number of pins
Ferrite bead
VDD11A
(1.15 V for GbE-PHY)
C = 10 µF
GND
Ferrite bead
VDD25A
(2.5 V for GbE-PHY)
= 47 µF C = 10 µF
GND
Open circuit, or connect to
AGND or GND.
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