Power Supply System - Cypress CY8CPROTO-062S3-4343W Manual

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.
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
Input Supply Header
VCC_5V
VCC_5V
C19
22uF
25V
VCC_3V6
C33
4.7uF
10V
CY8CPROTO-062S3-4343W PSoC 62S3 Wi-Fi BT Prototyping Kit Guide, Doc. # 002-28070 Rev. *A
VCC_3V6
J9
VCC_3V6 Voltage Regulator
U6
4
VIN LX
C20
NC
1
0.1uF
EN
16V
FB
AP3419KTTR-G1
VCC_3V3 Voltage Regulator
U7
1 5
IN OUT
C34
3 4
0.1uF
EN ADJ
16V
AP7365-WG-7
R31 57.6K
1%
Figure 3-4 shows the schematics of the voltage
3
L1 2.2uH 3.6V 600mA
5
R42
C41
383K
6
22pF
1%
50V
R36 76.8K
1%
Note: If R20 is loaded,
output is 2.5V
R22 0ohm
R17
R23
383K
180K
1%
1%
R20 0ohm
No Load
Note: If load of 600mA is applied to
VCC_3V3 voltage will drop below 3.2V
Hardware
VCC_3V6
C36 C38
22uF 22uF
25V 25V
VCC_3V3
C23
4.7uF
10V
31