CY3210-PSoCEVAL1 PSoC® 1 Evaluation Kit Guide, Doc. #: 001-66768 Rev. *F
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Hardware
Figure 4-3. Power Supply Schematic
4.2.1.1
Protection Circuit
A reverse-voltage and over-voltage protection circuit is added at the expansion port on VCC lines.
The protection circuit consists of two P-channel MOSFETs on the power line allowing the power/cur-
rent to flow from input to output depending on the voltages applied at the external board connector.
is the protection circuit placed between the VCC domain near the prototype board (on J5
connector) and the onboard components. This circuit disconnects or behaves similar to an open
switch if an external voltage above 5.6 V is applied on the VCC pins of the J5 connector.
Warning
Any voltage input greater than 12 V connected on these headers will permanently damage
the board components.
Figure 4-4. Protection Circuit
9-V Battery Connector
9-V to 12-V 1-Amp Input
Install Jumper for 3.3-V Operation and
Remove Jumper for 5-V Operation
