Texas Instruments TPS68401EVM User Manual
User's Guide
SLVU812–November 2012
TPS68401EVM User’s Guide
The TPS68401EVM is an evaluation board to assist in evaluating the TPS68401 IC as a multifunction LED
driver.
The TPS68401 device is an advanced lighting management unit for handheld devices. It 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. Channel one can optionally be supplied directly from
the battery voltage to reduce power consumption and improve efficiency.
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 I2C™ interface the device is
fully independent from the main processor resulting in significant system-level power savings. The device
can issue an interrupt to the main processor via the INT pin. The TRIG I/O allows synchronization
between multiple devices. A general-purpose output pin is provided which is addressable through the
serial interface. In addition, the INT pin can also be configured as general-purpose output.
The following related documents are available for download through the Texas Instruments web site
(http://www.ti.com) or via the links below.
SLVU812–November 2012 TPS68401EVM User’s Guide
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Figure 1. TPS68401EVM
Table 1. EVM Related Data Sheets
DEVICE LITERATURE NUMBER
TPS68401 SLVSA68
USB-TO-GPIO SLLU093
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Contents
1 INTRODUCTION ............................................................................................................ 3
1.1 Description .......................................................................................................... 3
1.2 Applications ......................................................................................................... 3
1.3 Features ............................................................................................................. 3
2 SYSTEM OVERVIEW ...................................................................................................... 4
3 BOARD LAYOUT ........................................................................................................... 5
4 HARDWARE OVERVIEW ................................................................................................. 9
4.1 Connectors .......................................................................................................... 9
4.2 Jumpers ............................................................................................................ 10
4.3 Test points ......................................................................................................... 10
4.4 EVM Operation ................................................................................................... 10
5 SOFTWARE ................................................................................................................ 11
5.1 Software Installation Instructions ............................................................................... 11
6 SCHEMATIC AND BILL OF MATERIALS .............................................................................. 13
List of Figures
1 TPS68401EVM.............................................................................................................. 1
2 System Block Diagram ..................................................................................................... 4
3 USB-to-GPIO Adapter...................................................................................................... 4
4 TPS68401EVM Board Layer 1 (SIGNAL) ............................................................................... 5
5 TPS68401EVM Board Layer 2 (GND) ................................................................................... 6
6 TPS68401EVM Board Layer 3 (POWER) ............................................................................... 7
7 TPS68401EVM Board Layer 4 (SIGNAL) ............................................................................... 8
8 Ribbon Cable Connection ................................................................................................ 10
9 setup.exe. File Location .................................................................................................. 11
10 TPS68401EVM GUI Main ................................................................................................ 12
11 TPS68401EVM GUI Basic ............................................................................................... 13
2
TPS68401EVM User’s Guide SLVU812–November 2012
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1 INTRODUCTION
1.1 Description
The Texas Instruments TPS68401 evaluation module (EVM) helps designers to evaluate TPS68401
advanced lighting management unit for handheld devices. These devices have 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. Channel one can optionally be supplied directly from the battery
voltage to reduce power consumption and improve efficiency.
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 I2C interface the device is
fully independent from the main processor resulting in significant system-level power savings. The device
can issue an interrupt to the main processor via the INT pin.
The TRIG I/O allows synchronization between multiple devices. A general-purpose output pin is provided
which is addressable through the serial interface. In addition, the INT pin can also be configured as
general-purpose output.
The EVM contains four independent TPS68401 devices that can be programmed and controlled trough a
GUI.
1.2 Applications
• LED control for portable applications
• Accent lighting (mood, personalization, etc.)
• Function indication (charge, messages, etc.)
• Keypad illumination/backlight (white or RGB)
• Display backlight
INTRODUCTION
1.3 Features
• Multifunction LED driver with three independent channels
• Integrated high efficiency 1x/1.5x charge pump with automatic or manual gain change
• 3 x 25.5-mA total output current
• Three independent program execution engines (3 x 16 instructions)
• 8-bit PWM with exponential control option
• 8-bit current DAC control
• 200-nA typical shutdown current
• Automatic power-save mode
• Autonomous operation without external control
• Trigger I/O for synchronizing multiple devices
• One or two general purpose output controlled via serial interface
• I2C interface
• Operating Temperature Range: -30ºC to 85ºC
• 20-ball WLCSP package with 0.4-mm pitch
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USB-to-I C
2
Adapter
TPS68401
EVM
SYSTEM OVERVIEW
2 SYSTEM OVERVIEW
The system block diagram is shown below.
The system consists of the following components:
Host (PC)—A Windows®personal computer (PC) – used to configure and monitor the TPS68401EVM.
The GUI operates on the host. For the GUI to execute properly, the host needs to have the correct
LabViewTM RunTimeTM version. If the host doesn’t have the correct RunTimeTM version it will be
prompted during GUI installation. More information in GUI installation section.
USB-to-I2C Adapter—TPS68401EVM uses the I2C interface for communication with the host. The TI-
supplied USB-to-I2C adapter does the appropriate conversion so the host can use the USB
interface for communication. USB-to-I2C adapter has a 3.3-V supply rail which is used to supply the
EVM so no external power supply is needed.
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Figure 2. System Block Diagram
TPS68401EVM— EVM board that houses the TPS68401 and peripheral components.
The evaluation module is designed to provide access to the features of the TPS65281. Some
modifications can be made to this module to test performance at different input and output voltages,
current and switching frequency. Please contact TI Field Applications Group for advice on these matters.
4
TPS68401EVM User’s Guide SLVU812–November 2012
Figure 3. USB-to-GPIO Adapter
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3 BOARD LAYOUT
BOARD LAYOUT
Figure 4. TPS68401EVM Board Layer 1 (SIGNAL)
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BOARD LAYOUT
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Figure 5. TPS68401EVM Board Layer 2 (GND)
6
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