We are using the CY8CMOD-064S0S2-4343W board design developed by Cypress and have created an identical board called Cloud Lock.
On the new Cloud Lock board the VCCD input supply is designed to use the internal Buck regulator as the source, same as the original design.
VDD_NS is sourced off board using a 2.5vdc supply and is the source for the internal buck regulator.
The output of the internal buck regulator is VIND1 this goes through a 2.2uH inductor to VBUCK which supplies the input power to VCCD through a zero ohm resistor (R26 see attached PDF for schematic)
When the power is first applied to the board there is no output from the internal buck on VIND1 and in looking at the TRM for the P64 the buck defaults to an “OFF” state.
The first-time power is applied to the P64 how do we get the buck regulator to output so we can get the device operational?
