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INTRODUCTION
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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 I
2
C 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
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LED control for portable applications
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Accent lighting (mood, personalization, etc.)
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Function indication (charge, messages, etc.)
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Keypad illumination/backlight (white or RGB)
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Display backlight
1.3
Features
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Multifunction LED driver with three independent channels
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Integrated high efficiency 1x/1.5x charge pump with automatic or manual gain change
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3 x 25.5-mA total output current
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Three independent program execution engines (3 x 16 instructions)
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8-bit PWM with exponential control option
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8-bit current DAC control
•
200-nA typical shutdown current
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Automatic power-save mode
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Autonomous operation without external control
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Trigger I/O for synchronizing multiple devices
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One or two general purpose output controlled via serial interface
•
I
2
C interface
•
Operating Temperature Range: -30ºC to 85ºC
•
20-ball WLCSP package with 0.4-mm pitch
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SLVU812 – November 2012
TPS68401EVM User’s Guide
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