CY8CKIT-030 PSoC® 3 Development Kit Guide, Doc. # 001-61038 Rev. *J
18
Hardware
Port E on the board is the designated analog expansion connector. This connector brings out
ports 0, 3, and 4, which are the best performing analog ports on PSoC 3 and PSoC 5 devices. Port E
has two types of grounds. One is the analog ground (GND_A in the silkscreen, Vssa in the
schematic), which connects directly to the analog ground on the board. The other ground, known as
GND, is used for the digital and high-current circuitry on the expansion board. This differentiation on
the connector grounds helps the expansion board designer to separate the analog and digital ground
on any high-precision analog boards being designed for port E.
4.2.1.3
Low-Power Functionality
The kit also facilitates application development, which requires low power consumption. Low-power
functions require a power measurement capability, also available in this kit.
The analog supply is connected to the device through the 0-
resistor (R23). By removing this
resistor and connecting an ammeter in series using the test points, Vdda_p and Vdda, you can
measure the analog power used by the system.
The digital supply can be monitored by removing the connection on jumper J10 and connecting an
ammeter in place of the short. This allows to measure the digital power used by the system.
The board provides the ability to measure analog and digital power separately. To measure power at
a single point, rather than at analog and digital separately, remove resistor R23 to disconnect the
analog regulator from powering the Vdda and short Vdda and Vddd through R30. The net power can
now be measured at jumper J10 similar to the digital power measurement. To switch repeatedly
between R23 and R30, moving around the 0-
resistors can be discomforting. Hence, a J38
(unpopulated) is provided to populate a male 3-pin header and have a shorting jumper in the place of
R23/R30.
While measuring device power, make the following changes in the board to avoid leakage through
other components that are connected to the device power rails.
■
Disconnect the RS-232 power by disconnecting R58. An additional jumper capability is available
as J37 if you populate it with a 2-pin male header.
■
Disconnect the potentiometer by disconnecting J30.
■
Ground the boost pins if boost operation is not used by populating R1, R28, and R29. Also, make
sure R25 and R31 are not populated.
4.2.2
Programming Interface
This kit allows programming in two modes:
■
Using the onboard programming interface
■
Using the JTAG/SWD programming interface with a MiniProg3
4.2.2.1
Onboard Programming Interface
The onboard programmer interfaces with your PC through a USB connector, as shown in
Figure 4-4
.
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