Comments: SparkFun USB UART Breakout (CY7C65213) Hookup Guide

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  • IF you are competent reworking surface mount parts, it is straight forward to convert this board for use on 1.8V systems. The procedure is: 1) Remove the SOT23 3.3V regulator (says G3P on top) and replace it with a matched series 1.8v regulator (AP2112K-1.8TRG1, Digikey AP2112K-1.8TRG1DICT-ND, says G3M on top. 2) Move the voltage selection jumper from "5.0" to "3.3" (note: that position is now 1.8V). 3) Apply the jumper on the backside of the board selecting for voltages below 2.0V. 4) Use the configuration application (see other SparkFun app notes) to program the part for less the 2.0V IO voltages (this turns off an internal regulator on the Cypress part).

    And you are good to go. Worked for me.

  • For using the board at voltages below 2V is it necessary to provide a reference voltage to the board? If so which pin has to be used?

    • For any voltage other than 3.3V or 5V, solder jumper JP2 must be cleared and the desired voltage must be applied to the VCC pin on the six pin header. That means that the board can only source voltage to 3.3V and 5V systems; systems at other voltages must supply their own voltage.


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