CY8CKIT-030 PSoC® 3 Development Kit Guide, Doc. # 001-61038 Rev. *J
16
Hardware
The board power domain has five rails:
■
Vin rail
: This is where the input of the onboard regulators are connected. This domain is powered
through protection diodes.
■
5-V rail
: This is the output of the 5-V regulator U2. The rail has a fixed 5-V output regardless of
jumper settings. The voltage in this rail can be less than 5 V only when the board is powered by
the USB. This 5-V rail powers the circuits that require fixed 5-V supply.
■
3.3-V rail
: This is the output of the 3.3-V regulator U4. This rail remains 3.3 V regardless of
jumper settings or power source changes. It powers the circuits requiring fixed 3.3-V supply such
as the onboard programming section.
■
Vddd rail
: This rail provides power to the digital supply for the PSoC device. It can be derived
from either the 5-V or 3.3-V rail. The selection is made using J10 (3-pin jumper).
■
Vdda rail
: This rail provides power to the analog supply of the PSoC device. It is the output of a
low-noise regulator U1. The regulator is a variable output voltage and can be either 3.3 V or 5 V.
This is done by changing the position on J11 (3-pin jumper).
The following block diagram shows the structure of the power system on the board.
Figure 4-2. Power System Structure
3.3-V Regulator
5-V Regulator
5-V/3.3-V Analog
Regulator
USB
Communication
Power
9-V Battery
12-V/9-V Wall
wart
Vin
Vddd
Selection
(J10)
Vdda
Selection
(J11)
3.3 V
Vddd
5 V
Vdda
USB
Programming
5 V
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