Texas Instruments TPL0401EVM Manuale utente

SLIU008A–September 2011–Revised November 2016

TPL0401EVM

User's Guide

SLIU008A–September 2011–Revised November 2016

TPL0401EVM

Contents

1 Features....................................................................................................................... 2

2 Introduction ................................................................................................................... 2

3 Mode Selection............................................................................................................... 2

4 Jumpers Connections ....................................................................................................... 3

5 Software Setup............................................................................................................... 3

6 Schematics, Layout and Bill of Materials ................................................................................. 6

List of Figures

1 GUI for DPOT Control....................................................................................................... 4

2 TPL0401B Variable Gain ................................................................................................... 5

3 TCA5405, TCA7408 Schematic ........................................................................................... 6

4 TLC59108 Schematic ....................................................................................................... 7

5 TPL0401 Schematic......................................................................................................... 8

6 Routing, Assembly and Silkscreen Top................................................................................... 9

7 Layer 2 Power Plane ...................................................................................................... 10

8 Layer 3 Ground Plane ..................................................................................................... 11

9 Routing and Assembly Bottom ........................................................................................... 12

10 Routing and Assembly Top and Bottom................................................................................. 13

List of Tables

1 Description of Connectors and Jumpers.................................................................................. 3

2 430Boost-TPL0401EVM Bill of Material................................................................................. 14

Trademarks

Windows is a trademark of Microsoft Corporation.

All other trademarks are the property of their respective owners.

Features

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2SLIU008A–September 2011–Revised November 2016

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TPL0401EVM

1 Features

• Works with low cost MSP430 based LaunchPad platform

• Simple GUI to control EVM

• EVM can be operated in three different modes

– Auto run LED mode

– Adjustable Voltage reference mode

– Variable gain mode

• Board is powered by USB

2 Introduction

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. The position of the wiper can be adjusted using an I2C interface. The TPL0401 is

available in a 6-pin SC-70 package with a specified temperature range of –40°C to +125°C. The part has

a 10k end-to-end resistance and can operate with a supply voltage range of 2.7 V to 5.5 V.

THE TPL0401EVM also consists of multiple other TI products (port expanders, LED drivers, and so forth).

However, the scope of this document is to illustrate the use of the EVM to evaluate the TPL0401. The

TPL0401EVM is designed to operate with the Texas Instruments LaunchPad (MSP-EXP430G2). The

TPL0401EVM comes with a preprogrammed MSP430G2553 microcontroller which is to be inserted in the

DIP socket on the LaunchPad. The LaunchPad can be separately purchased at www.ti.com/launchpad .

The TPL0401EVM has three different evaluation modes:

Mode 1 – LED mode – This is the standard mode the TPL0401 comes up in when powered up. In this

mode the TPL0401 devices are used to control the color mixing on the RGB LEDs. The DPOTs are used

to set the current limit for the TLC59108 LED driver. This mode is and auto run mode that does not have

any GUI control. The flashing lights and color mixing is controlled by the keys on the board and other TI

products on the board.

Mode 2 – Adjustable voltage reference mode – in this mode the TPL0401 is used in conjunction with an

LMV321 op amp as an adjustable voltage reference circuit.

Mode 3 – Variable gain mode – in this mode the TPL0401 is configured as part of a variable gain non-

inverting amplifier. The gain of the amplifier can be controlled by a digital interface. This mode can be

used to evaluate the bandwidth of the TPL0501.

The EVM is operated by connecting the LaunchPad to a PC that has Windows™ (with .NET) through the

USB Port. Other standard lab equipment such as Signal generator, multimeter, spectrum analyzer, and so

forth may be required for detailed analysis of the TPL0501 performance using this EVM.

3 Mode Selection

To setup any of these two modes, begin by connecting the EVM to the LaunchPad. Note the location of

the VCC and GND pins on headers J1 and J2 on both the LaunchPad and the EVM to ensure correct

installation.

1. LED Mode

Connect Jumpers 1 and 2 of J6

Connect +5-V supply to J3

Connect LaunchPad to computer through USB cable

NOTE: It can be possible to power up the LEDs by connecting a wire from the VCC pin of J1 to the

positive pin of J3. A 5-V supply might be required because the max voltage drop across the blue LED

plus the drop across the TLC59108 is larger than the supply voltage of the LaunchPad.

2. Voltage reference mode

Start up the board in LED mode as described earlier

Connect pins 1 and 2 of Jumper J7.

Connect pins 1 and 2 of Jumper J5.

Connect the LaunchPad and TPL0501EVM to a computer through the USB connector.

www.ti.com

Jumpers Connections

SLIU008A–September 2011–Revised November 2016

TPL0401EVM

Press keys SW2 and SW3 simultaneously

Start GUI software on computer

3. Variable Gain mode

Connect pins 2 and 3 of jumper J6.

Connect pins 1 and 2 of jumper J7.

Attach a signal generator to the EXT_IN connector (SMA or SMB connector may need to be

populated).

Press keys SW2 and SW3 simultaneously

Start GUI software on computer

Connect the LaunchPad and TPL0501EVM to a computer through the USB connector

4 Jumpers Connections

1. J1 & J2 – LaunchPad Headers

These connectors mate with the male headers on the LaunchPad

2. J3 – External LED Power

This connector is where the external +5V supply is attached to power the two RGB LEDs.

3. J4 – TCA7408 GPIO

This is a pin out of the four unused GPIO pins from the TCA7408, GPIO4-GPIO7.

4. J5 – Feedback loop

For the TPL0401A to function as a voltage reference circuit the negative feedback loop must be

shorted, placing a jumper across this header will short the inverting input to the output.

5. J6 – LED or Op-amp

This header controls what the TPL0401B is attached to. When shorted across position 1 and 2 the

TPL0401B is connected 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 the gain of the circuit.

6. J7 – Op-amp input

This header controls the input to the non-inverting pin of the LMV321. When shorted across position 1

and 2, the TPL0401A in a voltage divider mode is attached to the non-inverting input of the LVM321.

This setup is used to test the voltage reference setup. When shorted across pins 2 and 3, the SMA

connector is attached to the non-inverting input.

7. J9 – Test Points

This connector offers test points for the serial data lines, SDA, SCL and the DIN that drives the

TCA5405

Table 1. Description of Connectors and Jumpers

Label Description

J1, J2 Connectors to interface with LaunchPad

J3 External 5V for LED

J4 GPIO4-GPIO7 from TCA7408

J5 Control jumper to short feedback loop

J6 Jumper to control LED or Op-Amp

J7 Jumper to control input to Op-Amp

J8 SMA/B Footprint for external input

J9 Test points for DIN, SDA and SCL

5 Software Setup

The EVM does not require any software set up to operate in the LED mode. The keys SW1-SW4 control

the blinking rate of the LEDs and the color mixing of the LEDs, without any additional software setup.

Software Setup

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4SLIU008A–September 2011–Revised November 2016

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TPL0401EVM

To operate the EVM in any other mode, GUI software is required. The GUI software is available in a zip

file located on the TPL0401 product page on www.ti.com. Download the zip file and extract its contents to

a desired location on your PC. You will see an executable file called TPL0401_GUI.exe in the extracted

folder. Double click the file to open it and the GUI program should launch. IMPORTANT: Before launching

the GUI please make sure the TPL0401EVM is setup in the desired mode and connected to the PC

through a USB port.

Figure 1. GUI for DPOT Control

There are three methods to adjust the value of the TPL0401A/B. Start by clicking one of the buttons

circled in GREEN to select the corresponding TPL0401 device.

To adjust the tap value directly simply click the box that says tap and you will be prompted to input a tap

value between 0 and 127. After typing in the desired value press enter and the tap value will be sent to

the TPL0401A and the GUI will reflect the value you just entered.

To adjust the TPL0401 by inputting a wiper to low terminal resistance, click the box that says W-L

Resistance. You will then be prompted to input a value between 0 and 10,000 ohms; press enter after you

have input a value. The GUI will use the theoretical resistance values to find a tap that is closest to the

value that was input.

NOTE: All W-L resistance values are typical values; the actual value will be within 20% of the

displayed value

OUT

R12

TPL0401B

www.ti.com

Software Setup

SLIU008A–September 2011–Revised November 2016

TPL0401EVM

5.1 Voltage Reference Mode

Make sure the EVM is set up in voltage reference mode as described in Section 3. With the GUI open and

TPL0401A selected you are also given the option to change the voltage divider ratio of the TPL0401A as

a percent value. To do this simply click the box that says percent and you will be prompted to input a

percent value between 0 and 100; decimal values can be used. After pressing enter, the GUI will find and

send the tap value that is closest to the chosen percent value.

Using any of the methods to change the tap value of the TPL0401A will update the output voltage at TP1.

The output will be a percent of the supply voltage, 3.6 V.

5.2 Variable Gain Mode

The 430Boost-TPL0401EVM allows for a variable gain setup to evaluate the bandwidth of the TPL0401.

After following the setup instructions in Section 2, the circuit will look as follows:

Figure 2. TPL0401B Variable Gain

The capacitor C6 and the resistor R12 are unpopulated and should be set by the user. R12 will set the

possible gain values and C6 will keep the loop stable. Changing the value of the TPL0401B works the

same as described in the beginning of Section 5.

430Boost-TPL0401EVM

1 3

8/19/2011

TPL0401 Final Schematic.schChris Kraft

1.0

Texas Instruments

8/19/2011

Rev

Filename

Date

Engineer

Sheet

Drawn by

Number

Size

Title

Header to Launchpad

10k

.1u

200

1VCC

2DIN

3GND

4Q0 5

TCA5405RUG

R15

100k

R16

100k

A1 GND

A2 GPIO7

A3 GPIO6

A4 GPIO5

B1 VCCI

B2 VCCP

B3 ADDR

B4 GPIO4 C1

SDA

INT

RESET

GPIO3

SCL

GPIO0

GPIO1

GPIO2

TCA7408ZSZ

R13

R0402

10k

R14

R0402

10k

R11

100k

R17

100k

R18

100k

R19

100k

VCC

DIN

AGND

VCC

AGND

VCC

SDA

SCL

INT

EXT4

EXT5

EXT6

EXT7

EXT4

EXT5

EXT6

EXT7

DIN

VCC AGND

SDA

SCL

INT

VCC

DIN

SDA

SCL

AGND

Schematics, Layout and Bill of Materials

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6SLIU008A–September 2011–Revised November 2016

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TPL0401EVM

6 Schematics, Layout and Bill of Materials

6.1 Schematics

Figure 3. TCA5405, TCA7408 Schematic

430Boost-TPL0401EVM

A B

Title

Size

Number

Drawn by

Sheet

C D

Engineer

Date

Filename

Rev

8/19/2011

Texas Instruments

1.0

Chris Kraft TPL0401 Final Schematic.sch

8/19/2011

Optional

I2C Address: 1000000X

External 5V

R10

250

1REXT

2A0

3A1

4A2

5A3

6OUT0

7OUT1

8GND

9OUT2

10 OUT3 11

OUT4

OUT5

GND

OUT6

OUT7

GND

RESET

SCL

SDA

VCC

21 GND

TLC59108RGY

J3 C5

10u

R_OUT1

G_OUT1

B_OUT1

R_OUT2

G_OUT2

B_OUT2

SCL

SDA

AGND

R_OUT1

G_OUT1

B_OUT1

G_OUT2

B_OUT2

VCC

R_OUT2

REXT

DPOT

REXT

INV

AGND

www.ti.com

Schematics, Layout and Bill of Materials

SLIU008A–September 2011–Revised November 2016

TPL0401EVM

Figure 4. TLC59108 Schematic

3 3

8/19/2011

TPL0401 Final Schematic.schChris Kraft

1.0

Texas Instruments

8/19/2011

Rev

Filename

Date

Engineer

Sheet

Drawn by

Number

Size

Title

430Boost-TPL0401EVM

I2C Address: 0101110X

I2C Address: 0111110X

1VDD

2GND

3SCL 4

SDA

TPL0401xDCK

OUT

V-

V+

LM321MF

R12

1VDD

2GND

3SCL 4

SDA

TPL0401xDCK

TP1

INPUT

GND 3

GND

GND 5

GND

CONN_SMA

TP2

AGND

SDASCL

SCL SDA

VCC

AGND

VCC

DPOT

INV

SMA

AGND

VCC

AGND

VCC

SMA

Schematics, Layout and Bill of Materials

www.ti.com

8SLIU008A–September 2011–Revised November 2016

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TPL0401EVM

Figure 5. TPL0401 Schematic

www.ti.com

Schematics, Layout and Bill of Materials

SLIU008A–September 2011–Revised November 2016

TPL0401EVM

6.2 Layouts

Figure 6. Routing, Assembly and Silkscreen Top

Schematics, Layout and Bill of Materials

www.ti.com

10 SLIU008A–September 2011–Revised November 2016

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TPL0401EVM

Figure 7. Layer 2 Power Plane

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