CY3677 Evaluation Kit User Guide, Doc. No. 002-12185 Rev. *D
13
3
Kit Operation
The CY3677 EVK can be used to evaluate the CY29430, a high performance programmable oscillator. Connect the CY3677
kit through USB
to a PC running Cypress’s ClockWizard 2.1 software. The clock device CY29430 can be configured and
programmed to generate frequencies with best-in-class performance.
3.1 Theory of Operation
The CY3677 EVK offers one differential clock output and one single-ended clock output (only one operates at a time) for
evaluation. The CY29430 device uses an on-board crystal or Temperature Compensated Crystal Oscillator (TCXO) reference
input.
The kit is capable of generating fixed 3.3 V, 2.5 V, and 1.8 V voltages from a 5-V USB port. The on-board PSoC 5LP (U7)
performs the USB-to-I
2
C conversion. There is one power LED (LED2) driven from the on-board LDO supply and one status
LED (LED1) controlled by PSoC 5LP. The output of LDO regulator (U8) is configurable (3.3 V, 2.5 V, or 1.8 V) through jumper
J13.
Note:
An additional on-board LDO (U9
– not shown in
Figure 3-1
) generates a fixed 3.3-V supply for the PSoC 5LP in the
CY3677 Rev **
EVK. This feature has been changed in
CY3677 Rev *A
EVK where the PSoC 5LP is directly powered by a
5-V USB supply. The CY3677 kit revision is printed on the label at the back of the kit box.
Figure 3-1
illustrates the block diagram of the CY3677 EVK.
Figure 3-1. CY3677 EVK Block Diagram