Power Supply System - Cypress CY8CKIT-059 PSoC 5LP Prototyping Kit Manual

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)
■
3.3 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 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.
This prototyping kit does not have an 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.
4.2.3.1 Measure PSoC 5LP Current Consumption
You can measure the current consumption of the PSoC 5LP 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 the current
consumption.
Method 2:
1. Remove the resistor R20 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 5LP device.
This method can be used either with USB power or with power supplied to one of the VTARG pins
but not when supplying to one of the VDD pins.
CY8CKIT-059 PSoC® 5LP Prototyping Kit Guide, Doc. #: 001-96498 Rev. *G
Hardware
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