Datasheet

 2016-2019 Microchip Technology Inc. DS50002519D-page 13
RN4678
2.10 Reference Circuit
Figure illustrates the reference schematic of the power supply design implemented for the RN4678.
FIGURE 2-9: RN4678 REFERENCE CIRCUIT
SW_BTN
5
LDO33_O
6
LDO18_O
8
WAKEUP
9
PMULDO_O
10
P0_4
11
P1_5
12
P1_7/CTS
15
P0_5
16
P0_0/RTS
17
P2_0
18
EAN
20
P3_6
28
P3_7
29
LED
30
S
W
_
BTN
LD
O
3
3
_
O
LD
O
1
8
_
O
W
AKE
UP
PM
U
LDO
_
O
P
0
_
4
P1
_
5
P1
_
7
/
C
T
S
P
0
_
5
P
0
_
0
/
RT
S
P
2
_
0
E
A
N
P
3
_
6
P
3
_
7
LED
GND
1
GND
2
GND
3
BAT_IN
4
VDD_IO
7
P2_4
19
RST
21
UART_RX
22
UART_TX
23
P3_1
24
P3_2
25
P3_3
26
P3_4
27
GND
31
GND
32
GND
33
P1_2
13
P1_3
14
U1
RN4678
BAT_IN LDO33_O
B
BLUE
D1
UART
Functional GPIO
Status indication
RESET, W-UP, SW-BTN
MCU
100R
R4
10uF
C3
GND
1uF
C4
GND
RXD
TXD
P1_7
P0_0
P0_4
P0_5
P1_5
P3_1
P3_2
P3_3
P3_4
P3_6
P3_7
GND
JP1 JP2 JP3
Configuration
System
P1_2
P1_3
RESET
SW2
WAKEUP
SW3
2 3 14
5 6
SW_BTN
SW1
20k
R1
LDO33_O
GND
GND
GND
RST
W-UP
SW_BTN
W-UP
RST
SW_BTN