3 Replies Latest reply on Jul 24, 2015 2:52 AM by user_14586677

    3.3 V output from 5LP kit

    user_365962704

      Hi all,

         

      Sorry for the silly question, but is there anyway to get 3.3 volts out of the Vdd pins of the 5LP prototyping kit, or it is just possible on the Pioneer one?

         

      I'm trying to make a interface to an I2C temp IC (PCT2075 of NXP) and i would like to fed it with the 3.3 volts.

         

      Also a kind of advice about the library im making up, this is the first one i ever did haha. I don't know how to put code snippets here so find the files attached, i haven't finish the Doxygen documentation so ignore the comments, but the functions i tried are finished, if you have time take a look and i would like to have some feedback. Didn't use the I2C buffers because i want to make a easy to adjust to other uC like Kinetis or LPC, i don't know if those uC have one. (also i don't understand it very well yet.)

         

      Will attach a example project when i finish the adapter pcb for the sensor.

         

      Thanks in advance

         

      Carlos

        • 1. Re: 3.3 V output from 5LP kit
          user_14586677

          In general yes you can run the PSOC at 3.3 V (all I/O will be 3.3), or you

             

          can power specific ports at their own I/O level.

             

           

             

          Didn't use the I2C buffers because i want to make a easy to adjust to other uC like

             

          Kinetis or LPC, i don't know if those uC have one.

             

           

             

          Yes, they in general have across their families I2C capability.

             

           

             

          Regards, Dana.

          • 2. Re: 3.3 V output from 5LP kit
            user_365962704

            Hi Dana,

               

            as always all the info are in the datasheets, in this case on the kit guide:

               

            4.2.3 Power Supply System
            The power supply system on this board is dependent on the source of the power. For most applications, you can use the 5 V supply from the USB connection to power the system. You can also connect an external power supply to the board for low-voltage applications. The kit supports the following connections:
            ■ 5 V from the KitProg USB
            ■ 5 V from the PSoC 5LP Target USB (this will not power the KitProg section of the board)
            ■ 3.3V to 5.5V from a regulated supply connected to VDD (this will not power the KitProg section of the board)

               


            Note: In order to use an external power supply, while KitProg is connected to the PCB USB, remove diode, D1, from the board. This ensures that VTARG supply from KitProg is not supplied to the target device. KitProg measures the target voltage and adjusts the logic levels on the programming pins accordingly.
            It is important to understand that this prototyping kit does not have any onboard ESD protection circuitry. Therefore, the power source for the PSoC 5LP Prototyping Kit must be of a high quality to ensure that the board is protected from any over-current conditions and swapped-power connections.

               

             

               

            Thanks for the help

            • 3. Re: 3.3 V output from 5LP kit
              user_14586677

              Glad to have been of help.

                 

               

                 

              Regards, Dana.