CY8CKIT-043 PSoC® 4 M-Series Prototyping Kit Guide, Doc. #: 001-97606 Rev. **
24
Hardware
4.2.3
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 KitProg USB (J6)
■
3.3 V to 5.5 V from a regulated supply connected to VDD (this will not power the KitProg section
of the board)
Note:
To use an external power supply, while the KitProg is connected to the PCB USB, remove the
D1 diode from the board. This ensures that VTARG supply from the KitProg is not supplied to the tar-
get device. The KitProg 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 4 M-Series Prototyping Kit must be of a high quality to ensure
that the board is protected from any over-current conditions and swapped-power
connections.
4.2.3.1
Measure PSoC 4 Current Consumption
You can measure current consumption of the PSoC 4200M device by using one of these methods:
Method 1:
1. Separate the KitProg board by 'snapping' the perforated edge between the two boards.
2. Power the remaining prototyping board via any of the VDD or VTARG terminals.
3. Place an ammeter in series with the VDD or VTARG connection to measure current consumption.
Method 2:
1. Remove the resistor R22 and install a 2-pin jumper in the supplied holes of J4.
2. Connect an ammeter across the 2-pin jumper to measure the current to the PSoC 4200M device.
This method can be used either with USB power or with power supplied to one of the VTARG pins
but NOT when supplying power to one of the VDD pins.
4.2.4
Board Separation (Snapping)
The PSoC 4 M-Series Prototyping Kit consists of both a PSoC 4200M and a KitProg board. To sepa-
rate the two boards for evaluation or development, break the two boards apart at the built-in perfo-
rated edge.
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 KitProg board is off the table
edge. Press gently on the KitProg 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 I
2
C connections between the PSoC 4200M device and KitProg are
lost. This is because the traces connecting the UART and I
2
C lines are cut off during the separation.
However, you can access the KitProg's UART and I
2
C lines through headers J8 and J9.
