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HARDWARE OVERVIEW
4
HARDWARE OVERVIEW
The TPS68401EVM allows evaluation of the TPS68401 Advanced Lighting Management Unit for handheld
devices. TPS68401 has three independent channels optimized for driving RGB LEDs. The built-in
fractional charge pump boosts the input voltage to power the LEDs at low input voltage. At the heart of the
device is a programmable state machine which executes a lighting program consisting of up to 16
instructions per channel. Once the program is loaded through the I
2
C interface the device is fully
independent from the main processor resulting in significant system-level power savings. The TRIG I/O
allows synchronization between multiple devices.
The TPS68401EVM can be configured and monitored through a Windows GUI application running on a
PC. The GUI communicates with the TPS68401EVM through the USB Interface Adapter (included with
EVM kit), which acts as an I
2
C master for the board. TPS68401EVM has four TPS68401 devices and
those can be separately programmed through the GUI.
The TPS68401EVM provides the following functionality:
•
Programming of the four different TPS68401 devices (all four devices have different I
2
C addresses
which can be selected from the GUI).
•
Driving either RGB or white LED’s (see jumper setting).
•
32-kHz oscillator on board is used as an external clock the TPS68401 devices on board.
•
Trigger button to enable synchronous program execution between several devices.
•
Indicator LEDs for all four general purpose outputs (GPOs).
•
Standard 400-kHz I
2
C communication via I
2
C connector to USB adapter for connection to a PC.
•
Board can be supplied through the 3.3 V from the USB adapter or from an external power source (see
jumper setting).
4.1
Connectors
The TPS68401EVM has connectors for power and I
2
C communications. J1 provides a possibility to power
EVM from an external power supply (between 2.7 V and 5.5 V). USB adapter Interface Adapter has 3.3-V
power output that can be used to power the board so there is no need for external power source.
P1 header provides the I
2
C communication interface to the TPS68401EVM. The USB Interface Adapter
includes a ribbon cable that can be connected to P1. The adapter is connected to a Windows-based PC.
CAUTION
When
using
an
external
power
supply
for
the
TPS68401EVM,
the
recommended supply range for TPS68401 is from 2.7 V to 5.5 V.
9
SLVU812 – November 2012
TPS68401EVM User’s Guide
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