CY8CPROTO-062S3-4343W PSoC 62S3 Wi-Fi BT Prototyping Kit Guide, Doc. # 002-28070 Rev. *A
31
Hardware
3.2.4
Power Supply System
The power supply system on this board is versatile, allowing the input supply to come from the fol-
lowing sources:
■
5 V from the onboard USB Micro-B connectors
(J8
and
J10)
■
5 V from external power supply through VCC_5V at
J9.1
The power supply system is designed to support 1.8V to 3.3V operation of the PSoC 6 MCU. A
voltage of 5V is provided from USB port and is required for the operation of KitProg3. There are
three regulators used to achieve 3.6V, 3.3V, and 1.8V outputs - a buck regulator
(U6)
that generates
a fixed 3.6V from an input of 5V, a fixed 3.3V regulator
(U7)
and a fixed 1.8V regulator
(U9)
. Both
U7
and
U9
are powered by VCC_3V6 produced by
U6
.
shows the schematics of the voltage
regulator and power selection circuits.
The voltage selection is made through jumper
(J3)
.
Note:
VCC_3V3 can be optionally made to 2.5V for eFuse programming of PSoC 6 MCU by loading
R20. Once completed it is expected that kit is reverted to 3.3V or 1.8V as operation of the board at
2.5V is not intended. VCC_3V3 powers the Quad SPI flash that requires voltage > 3 V and hence the
flash will not function when VCC_3V3 is 2.5 V.
Figure 3-4. Schematics of Power Supply System
VCC_3V6
J9
1
2
3
VCC_5V
Input Supply Header
R36
76.8K
1%
VCC_5V
AP3419KTTR-G1
U6
EN
1
VIN
4
LX
3
NC
5
FB
6
GN
D
2
VCC_3V6
3.6V 600mA
VCC_3V6 Voltage Regulator
R42
383K
1%
L1
2.2uH
C36
22uF
25V
C41
22pF
50V
C38
22uF
25V
C20
0.1uF
16V
C19
22uF
25V
R23
180K
1%
Note: If R20 is loaded,
output is 2.5V
R31
57.6K
1%
R17
383K
1%
R20
0ohm
No Load
VCC_3V6
U7
AP7365-WG-7
IN
1
GN
D
2
EN
3
ADJ
4
OUT
5
VCC_3V3
VCC_3V3 Voltage Regulator
C23
4.7uF
10V
R22
0ohm
C33
4.7uF
10V
C34
0.1uF
16V
Note: If load of 600mA is applied to
VCC_3V3 voltage will drop below 3.2V
