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Connecting the ribbon cable to TPS68401EVM pin one is marked on the EVM and with the red stripe in the ribbon
cable.
Figure 8. Ribbon Cable Connection
4.2
Jumpers
The TPS68401EVM operation can be configured using jumpers:
•
Board power from external supply or USB Interface Adapter
•
Driving RGB or white LEDs
Table 2. TPS68401EVM Jumpers
NO.
FUNCTION
DEFAULT SETTING
Board power supply selection. Connect to pins 1-2 when using 3.3 V from the USB Interface
Pins 1-2 (Power from USB Interface
P2
Adapter and pins 2-3 if external power supply is used.
Adapter)
RGB or white LEDs are connected. Connect to pins 1-2 if RGB LEDs are used and 2-3 when
P3
using white LEDs. If using U4 to generate PWM signals for other devices through P5
Pins 1-2 (RGB LEDs connected)
connector pin 2-3 need to be connected.
4.3
Test points
The TPS68401EVM provides test points that can be used for evaluation. Important voltages can be
monitored with a meter through the use of the test points.
4.4
EVM Operation
The TPS68401EVM operates from either USB Interface Adapter (through P1) or External Power Supply
(through J1). Jumper P2 can be used to select the power source.
1. Connect the USB Interface Adapter to the TPS68401EVM P1 connector using the ribbon cable
provided.
2. Plug the appropriate end of the USB cable into the adapter and the other end into your PC.
NOTE:
If using an external power supply connect jumper’s pins 2-3 and use J1 to connect the power
supply.
10
TPS68401EVM User’s Guide
SLVU812 – November 2012
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