PSoC® 4000S Prototyping Kit Guide, Doc. # 002-11504 Rev. *A
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A.1.2.3
Power Supply System
The power supply system on this board is dependent on the power source. 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 KitProg2 USB (J8)
■
3.3 V to 5.5 V from a regulated supply connected to VTARG (this will not power the KitProg2
section of the board)
Note:
To use an external power supply, while KitProg2 is connected to the PCB USB, remove the
D1 diode from the board. This ensures that VTARG supply from KitProg2 is not supplied to the target
device. KitProg2 measures the target voltage and adjusts the logic levels on the programming pins
accordingly.
Note that this prototyping kit does not have any onboard ESD protection circuitry. Therefore,
the power source for the PSoC 4000S Prototyping board must be of a high quality to ensure
that the board is protected from any over-current conditions and swapped-power connec-
tions.
A.1.2.4
Measure PSoC 4000S Current Consumption
You can measure current consumption of the PSoC 4000S device by following the steps below.
1. Remove the resistors R22, R23 and install a 2-pin jumper in the supplied holes of J3.
2. Connect an ammeter across the 2-pin jumper to measure the current to the PSoC 4000S device.
This method can be used either with USB power or with the power supplied to one of the VTARG
pins but NOT when supplying power to one of the VDD pins.
After measuring the current consumption, populate the resistors R22 and R23 for normal operation
of the kit.
A.1.2.5
Board Separation (Snapping)
The PSoC 4000S Prototyping board consists of a PSoC 4000S board, a KitProg2 board and two
sensor boards.
CAUTION!
Do not apply excess pressure on the board while snapping as it may damage the on-
board components.
To separate the PSoC 4000S and KitProg2 boards for evaluation or development, break the two
boards apart at the built-in perforated edge between J4 and J5. The easiest method of separating
the two boards is to place the kit on the edge of a table, where the edge of the table is directly below
the perforated edge and the smaller KitProg2 board is off the table edge. Press gently on the Kit-
Prog2 board and snap the two boards apart. If any material is removed from the edge of the boards,
use shears to clean up the edge of the kit. Note that once the boards are separated, direct UART
and I2C connections between the PSoC 4000S device and KitProg2 are lost. This is because the
traces connecting the UART and I2C lines are cut off during the separation. However, you can
access KitProg2’s UART and I2C lines through header J6.
