PSoC™ 6 Wi-Fi Bluetooth® pioneer kit guide, Document Number. 002-22677 Rev. *I
38
Hardware
3.2.4
Power supply system
The power supply system on this board is versatile, allowing the input supply to come from the
following sources:
■
5 V, 9 V, or 12 V from the on-board USB Type-C connector
■
5 V to 12 V power from a shield compatible with Arduino or from external power supply through
VIN header
J9
or
J1
■
5 V from an external programmer/debugger connected to
J11
and
J12
The power supply system is designed to support 1.8 V to 3.3 V operation of the PSoC™ 6 MCU. In
addition, an intermediate voltage of 5 V is required for operation of the KitProg3. Therefore, three
regulators are used to achieve 1.8 V to 3.3 V and 5 V outputs – a buck boost regulator
(U30)
that
generates a fixed 5 V from an input of 5 V to 12 V, and a main regulator
(U10)
that generates either
a variable 1.8 V to 3.3 V, or a fixed 1.8 V, or a fixed 3.3 V from the output of
U30
the schematics of the voltage regulator and power selection circuits.
The voltage selection is made through switch
SW5
. In addition, an on-board 330-mF super capacitor
(C103)
can be used to power the backup domain (VBACKUP) of PSoC™ 6 MCU. The switch
SW7
selects the VBACKUP supply connection of the PSoC™ 6 MCU between V
DDD
and the super
capacitor. When V
DDD
is selected, the variable regulator ON/OFF terminal is controlled by KitProg3.
When the super capacitor is selected, the regulator ON/OFF terminal is controlled by the PSoC™ 6
MCU. To ensure proper operation of the PSoC™ 6 MCU, the super capacitor, when selected, must
be charged internally by the PSoC™ 6 MCU before turning OFF the regulator. For details of the
PSoC™ 6 MCU backup system and power supply, see the
