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Introduction

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1.1

Features

Works with MSP430 Launchpad

Illustrates the use of TPL0401DPOT for color mixing

TCA7408 used for Key press detection

Shows the use of Single wire self timed interface in TCA5405

Color mixing and LED blinking control

1.2

TPL0401A/B

The TPL0401 is an I2C bus controlled, single channel, linear-taper digital potentiometer with 128 wiper
positions. TPL0401A/B have an end-to-end resistance of 10k ohms and the low terminal internally
connected to ground.

1.3

TCA5405

The TCA5405 is a 5-bit output expander controlled using a single wire input. This device is ideal for
portable applications as it has a wide VCC range of 1.65V to 3.6 V. The TCA5405 uses a self-timed serial
data protocol with a single data input driven by a master device synchronized to an internal clock of that
device.

1.4

TCA7408

This 8-bit I/O expander for the two-line bidirectional bus (I

2

C) is designed to provide general-purpose

remote I/O expansion via the I

2

C interface [serial clock (SCL) and serial data (SDA)]. The major benefit of

this device is its wide VCC range. It can operate from 1.65-V to 3.6-V on the GPIO-port side and 1.65-V to
5.5-V on the SDA/SCL side. This allows the TCA7408 to interface with next-generation microprocessors
and microcontrollers on the SDA/SCL side, where supply levels are dropping down to conserve power.
The TCA7408 open-drain interrupt (INT) output is activated when any GPIO set as an input has a
transition to the state opposite of that in the Input Default State register and the corresponding bit in the
Interrupt Mask Register is set to 0. It is used to indicate to the system master that an input has changed to
a pre-determined state.

1.5

TLC59108

The TLC59108 is an I

2

C bus controlled 8-bit LED driver that is optimized for red/green/blue/amber (RGBA)

color mixing and backlight application for amusement products. Each LED output has its own 8-bit
resolution (256 steps) fixed-frequency individual PWM controller that operates at 97 kHz, with a duty cycle
that is adjustable from 0% to 99.6%. The individual PWM controller allows each LED to be set to a specific
brightness value. An additional 8-bit resolution group PWM controller has both a fixed frequency of 190 Hz
and an adjustable frequency between 24 Hz to once every 10.73 seconds, with a duty cycle that is
adjustable from 0% to 99.6%. The group PWM controller dims or blinks all LEDs with the same value.
TLC59108 scales up the reference current set by the external resistor (Rext) to sink the output current
(Iout) at each output port.

1.6

Requirements

In order to operate this EVM, the following components must be connected and properly configured.

1.6.1

LaunchPad

A Texas Instruments LaunchPad (MSP-EXP430G2) with the male headers and an MSP430G2553
microcontroller installed is required to run the board. A LaunchPad can be acquired here
(

https://estore.ti.com/MSP-EXP430G2-MSP430-LaunchPad-Value-Line-Development-kit-P2031.aspx

)

NOTE: IMPORTANT: The code to control the TCA7408EVM/TCA5405EVM was written from an

MSP430G2553 and will not work with the MSP430 chips that are included with the
LaunchPad kit.

2

TCA7408EVM,TCA5405EVM

SCPU034

December 2011

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Copyright

©

2011, Texas Instruments Incorporated

Summary of Contents for TCA5405EVM

Page 1: ...3 TLC59108 Schematic 7 4 TPL0401 Schematic 8 5 Routing Assembly and Silkscreen Top 9 6 Layer 2 Power Plane 10 7 Layer 3 Ground Plane 11 8 Routing and Assembly Bottom 12 List of Tables 1 Description o...

Page 2: ...ster and the corresponding bit in the Interrupt Mask Register is set to 0 It is used to indicate to the system master that an input has changed to a pre determined state 1 5 TLC59108 The TLC59108 is a...

Page 3: ...nected in series with the external resistor to control the current through the LED driver When shorted across position 2 and 3 the TPL0401B is connected to the inverting input of the op amp to change...

Page 4: ...he TLC59108 LED driver this setup will control D6 and D7 Each color is set to a fixed PWM to ensure baseline brightness is similar Color mixing is then accomplished through unique methods The desired...

Page 5: ...TCA5405 This function works very simply by driving a GPIO pin to high or low and utilizing the _delay_cycles function to hold the value After each assert on the GPIO pin a _delay_cycles 16 is called t...

Page 6: ...terials www ti com 5 Schematics Layout and Bill of Materials 5 1 Schematics Figure 2 TCA5405 TCA7408 Schematic 6 TCA7408EVM TCA5405EVM SCPU034 December 2011 Submit Documentation Feedback Copyright 201...

Page 7: ...www ti com Schematics Layout and Bill of Materials Figure 3 TLC59108 Schematic 7 SCPU034 December 2011 TCA7408EVM TCA5405EVM Submit Documentation Feedback Copyright 2011 Texas Instruments Incorporated...

Page 8: ...Schematics Layout and Bill of Materials www ti com Figure 4 TPL0401 Schematic 8 TCA7408EVM TCA5405EVM SCPU034 December 2011 Submit Documentation Feedback Copyright 2011 Texas Instruments Incorporated...

Page 9: ...ematics Layout and Bill of Materials 5 2 Layout Figure 5 Routing Assembly and Silkscreen Top 9 SCPU034 December 2011 TCA7408EVM TCA5405EVM Submit Documentation Feedback Copyright 2011 Texas Instrument...

Page 10: ...chematics Layout and Bill of Materials www ti com Figure 6 Layer 2 Power Plane 10 TCA7408EVM TCA5405EVM SCPU034 December 2011 Submit Documentation Feedback Copyright 2011 Texas Instruments Incorporate...

Page 11: ...w ti com Schematics Layout and Bill of Materials Figure 7 Layer 3 Ground Plane 11 SCPU034 December 2011 TCA7408EVM TCA5405EVM Submit Documentation Feedback Copyright 2011 Texas Instruments Incorporate...

Page 12: ...atics Layout and Bill of Materials www ti com Figure 8 Routing and Assembly Bottom 12 TCA7408EVM TCA5405EVM SCPU034 December 2011 Submit Documentation Feedback Copyright 2011 Texas Instruments Incorpo...

Page 13: ...R11 10k Resistor Chip 1 16W 5 R13 R14 R17 R19 5 R5 9 200 Resistor Chip 1 16W 1 1 R10 250 Resistor Chip 1 16W 1 1 R12 value Resistor Chip 1 16W 5 DNI 1 TP2 5001 Test Point Black Thru Hole 5001 Keyston...

Page 14: ...ncy energy and has not been tested for compliance with the limits of computing devices pursuant to part 15 of FCC or ICES 003 rules which are designed to provide reasonable protection against radio fr...

Page 15: ...na type and its gain should be so chosen that the equivalent isotropically radiated power e i r p is not more than that necessary for successful communication This radio transmitter has been approved...

Page 16: ...roduct only after you obtained the license of Test Radio Station as provided in Radio Law of Japan with respect to this product or 3 Use of this product only after you obtained the Technical Regulatio...

Page 17: ...property damage personal injury or death If there are questions concerning these ratings please contact a TI field representative prior to connecting interface electronics including input power and in...

Page 18: ...egulatory and safety related requirements concerning its products and any use of TI components in its applications notwithstanding any applications related information or support that may be provided...

Page 19: ...Mouser Electronics Authorized Distributor Click to View Pricing Inventory Delivery Lifecycle Information Texas Instruments TCA7408 5405EVM...

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