Texas Instruments BUF12800 Manual de usuario

SBOU116A–September 2011–Revised August 2016

BUF12800EVM Evaluation Board and Software Tutorial

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User's Guide

SBOU116A–September 2011–Revised August 2016

BUF12800EVM Evaluation Board and Software Tutorial

This user's guide describes the characteristics, operation, and use of the BUF12800EVM evaluation

board. It discusses how to set up and configure the software and hardware and reviews various aspects of

the program operation. Throughout this document, the terms evaluation board,evaluation module, and

EVM are synonymous with the BUF12800EVM. This user's guide also includes information regarding

operating procedures and input/output connections, an electrical schematic, printed circuit board (PCB)

layout drawings, and a parts list for the EVM.

Contents

1 Overview ..................................................................................................................... 2

2 BUF12800EVM Hardware Setup .......................................................................................... 3

3 BUF12800EVM Hardware.................................................................................................. 5

4 BUF12800EVM Features.................................................................................................. 11

5 BUF12800EVM Software Setup.......................................................................................... 13

6 BUF12800EVM Software Overview...................................................................................... 16

7 BUF12800EVM Documentation.......................................................................................... 24

List of Figures

1 BUF12800EVM Hardware Setup.......................................................................................... 3

2 BUF12800EVM Board Block Diagram.................................................................................... 4

3 USB DIG Platform Block Diagram......................................................................................... 5

4 Typical Hardware Connections for the BUF12800EVM ................................................................ 6

5 Connecting External Power to the BUF12800EVM ..................................................................... 7

6 Connecting the USB Cable to the USB DIG Platform .................................................................. 8

7 Confirmation of USB DIG Platform Driver Installation .................................................................. 8

8 Default Jumper Locations for BUF12800EVM........................................................................... 9

9 BUF12800EVM Software Install Window ............................................................................... 14

10 BUF12800EVM Software License Agreements........................................................................ 14

11 BUF12800EVM Software Installation Progress ........................................................................ 15

12 BUF12800EVM Software About Button................................................................................. 15

13 BUF12800EVM Software Interface ...................................................................................... 16

14 Communication Error with USB DIG Platform.......................................................................... 17

15 JMP6 Setting for Logic ‘0’................................................................................................. 17

16 JMP6 Setting for Logic ‘1’................................................................................................. 18

17 Measuring and Entering Power-Supply Voltage ....................................................................... 18

18 Auto Write Feature Enabled .............................................................................................. 19

19 Save File Prompt........................................................................................................... 20

20 Saved Data Format ........................................................................................................ 21

21 Load File Prompt........................................................................................................... 21

22 Run Batch Dialog........................................................................................................... 22

23 Control Panel Window..................................................................................................... 23

Overview

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24 BUF12800EVM Board Schematic........................................................................................ 24

25 BUF12800EVM PCB Top Layer (Component Layout) ................................................................ 25

1 Overview

The BUF12800 is a programmable gamma-voltage generator. This device offers 12 programmable

gamma channels, making it ideal for 10-bit source TFT-LCD reference drivers.

The BUF12800EVM is a platform for evaluating the performance of the BUF12800 under various signal,

reference, and supply conditions. This document gives a general overview of the BUF12800EVM, and

provides a general description of the features and functions to be considered while using this evaluation

module.

1.1 BUF12800EVM Kit Contents

Table 1 lists the contents of the BUF12800EVM kit. Contact the Texas Instruments Product Information

Center nearest you if any component is missing. It is highly recommended that you also check the

BUF12800 product folder on the TI web site at www.ti.com to verify that you have the latest versions of

the related software.

Table 1. BUF12800EVM Kit Contents

Item Quantity

BUF12800EVM PCB Test Board 1

USB_DIG_Platform PCB 1

USB Cable 1

Barrel plug cable assembly (part # 10-01935 -

Tensility International Corporation) for external power supply 1

User’s Guide CD-ROM 1

1.2 Related Documentation from Texas Instruments

The following documents provide information regarding Texas Instruments' integrated circuits used in the

assembly of the BUF12800EVM. This user's guide is available from the TI web site under literature

number SBOU116. Any letter appended to the literature number corresponds to the document revision

that is current at the time of the writing of this document. Newer revisions may be available from the TI

web site, or call the Texas Instruments' Literature Response Center at (800) 477-8924 or the Product

Information Center at (972) 644-5580. When ordering, identify the document by both title and literature

number.

Table 2. Related Documentation

Document Literature Number

BUF12800 Product Data Sheet SBOS315

USB_DIG_Platform User Guide SBOU058

Computer

+ 6 VDC

Wall Supply

BUF12800

Analog Supply

BUF12800

Test Board

Measurement

Device

Outputs

USB DIG Platform

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BUF12800EVM Hardware Setup

SBOU116A–September 2011–Revised August 2016

BUF12800EVM Evaluation Board and Software Tutorial

2 BUF12800EVM Hardware Setup

This section discusses the overall system setup for the BUF12800EVM. The PC runs software that

communicates with the USB_DIG_Platform. The USB DIG Platform generates the analog and digital

signals used to communicate with the BUF12800 test board. Connectors on the BUF12800 test board

allow the user to connect to the system under various test conditions and monitor the power, current, and

voltage. A block diagram of the overall hardware setup is shown in Figure 1.

Figure 1. BUF12800EVM Hardware Setup

Test Outputs

25-Pin Male

DSUB

External BUF12800

Analog Power Supply

V Supply

(V Power Supply)

DUT

I C Interface

I C A0 Address

Jumper

TP1 Test Point

Header

BUF12800

BUF12800EVM Hardware Setup

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2.1 Theory of Operation for BUF12800 Hardware

Figure 2 shows the BUF12800 test board hardware setup. The functionality of the PCB is such that it

provides connections to the I2C and general-purpose inputs/outputs (GPIOs) on the USB DIG Platform

board. It also provides connection points for external connections of the shunt voltage, bus voltage, and

ground.

Figure 2. BUF12800EVM Board Block Diagram

2.2 Signal Definitions of J1 (25-Pin Male DSUB)

Table 3 shows the various signals connected to J1 on the BUF12800 test board.

(1) When power is switched off, digital I/O is also switched off.

Table 3. J1 Signal Definition for BUF12800EVM

Pin No on U1 Signal BUF12800 Pin

1 N/C No connection

2 N/C No connection

3 N/C No connection

4 N/C No connection

5 N/C No connection

6 N/C No connection

7 N/C No connection

8 N/C No connection

9 I2C_SCK No connection

10 I2C_SDA2 No connection

11 N/C No connection

12 I2C_SCK_ISO I2C clock signal (SCL) channel 1; can be

disconnected using a switch

13 I2C_SDA_ISO I2C data signal (SDA) channel 1; can be

disconnected using a switch

14 N/C No connection

15 N/C No connection

16 N/C No connection

17 VDUT Switched 3-V/5-V power(1)

18 VCC No connection

19 N/C No connection

20 N/C No connection

21 GND Common ground connection

22 SPI_SCK No connection

23 SPI_CS1 No connection

24 SPI_DOUT1 No connection

25 SPI_DIN1 No connection

TUSB3210

8052 C

with USB Interface

and UART

USB

From Computer

Adjustable

Regulator

(2.7 V to 5.5 V)

V Cm

3.3V

V_USB

8K Byte

EEPROM

Calibration

EEPROM

Buffers and

Latches

Power

Switching

(2.7 V to 5.5 V)

DUT

Switched Power

I C, SPI

Control Bits and

Measure Bits

External Power

(6 VDC)

Reset Button

and

Power-On Reset

USB_DIG_Platform

3.3-V

Regulator

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BUF12800EVM Hardware

SBOU116A–September 2011–Revised August 2016

BUF12800EVM Evaluation Board and Software Tutorial

2.2.1 Theory of Operation for USB DIG Platform

Figure 3 shows the block diagram for the USB DIG platform. This platform is a general-purpose data

acquisition system that is used on several different Texas Instruments evaluation modules. The details of

its operation are included in a separate document, SBOU058 (available for download at www.ti.com). The

block diagram shown in Figure 3 gives a brief overview of the platform. The primary control device on the

USB DIG platform is the TUSB3210.

Figure 3. USB DIG Platform Block Diagram

3 BUF12800EVM Hardware

This section provides details about connecting the two PCBs of the BUF12800EVM together, applying

power, connecting the USB cable, and setting the jumpers.

3.1 Electrostatic Discharge Warning

CAUTION

Many of the components on the BUF12800EVM are susceptible to damage by

electrostatic discharge (ESD). Customers are advised to observe proper ESD

handling precautions when unpacking and handling the EVM, including the use

of a grounded wrist strap at an approved ESD workstation.

BUF12800EVM Hardware

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3.2 Typical Hardware Connections

Setting up the BUF12800EVM hardware involves connecting the BUF12800 test board and the USB DIG

Platform together via a 25-pin DSUB connector and then applying power. The external connections may

be connected to the real-world system that the BUF12800 is to be incorporated into. Figure 4 shows the

typical hardware connections.

Figure 4. Typical Hardware Connections for the BUF12800EVM

3.3 Connecting the Hardware

To connect the BUF12800 Test Board and the USB DIG Platform together, gently push on both sides of

the DSUB connectors. Note that the USB DIG Platform board has two DSUB connectors; either DSUB

connector may be used. Make sure that the two connectors are completely pushed together; loose

connections may cause intermittent operation.

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BUF12800EVM Hardware

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BUF12800EVM Evaluation Board and Software Tutorial

3.4 Connecting Power

After the boards are conjoined, connect the +6-V wall supply to the USB DIG Platform board as shown in

Figure 5. Note that it is always necessary to connect the power to the DIG before connecting the USB

cable. If the USB cable is connected before the power, the computer may attempt communication to an

unpowered device that is unable to respond. In addition, the BUF12800 test board requires an external dc

power source. This source is not included with the kit, and its voltage may differ depending on your testing

needs. The source will be used to provide dc supply voltage to the BUF12800 test board.

Figure 5. Connecting External Power to the BUF12800EVM

BUF12800EVM Hardware

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3.5 Connecting the USB Cable to the USB DIG Platform

Once power is connected, the USB cable must be connected to the DIG, as shown in Figure 6.

Figure 6. Connecting the USB Cable to the USB DIG Platform

Note that the Test Board and USB DIG Platform must be powered on before connecting the USB cable.

Typically, the computer responds with a Found New Hardware, USB Device pop-up dialog. The popup

window typically changes to Found New Hardware, USB Human Interface Device. This pop-up window

indicates that the device is ready to be used. The USB DIG Platform uses the human interface device

drivers that are part of the Microsoft®Windows®operating system.

In some cases, the Windows Add Hardware wizard is shown. If this prompt appears, allow the system

device manager to install the human interface drivers by clicking Yes when requested to install drivers.

Windows then confirms installation of the drivers with the message shown in Figure 7.

Figure 7. Confirmation of USB DIG Platform Driver Installation

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BUF12800EVM Hardware

SBOU116A–September 2011–Revised August 2016

BUF12800EVM Evaluation Board and Software Tutorial

3.6 BUF12800EVM Default Jumper Settings

Figure 8 shows the default jumpers configuration for the BUF12800EVM. In general, the jumper settings of

the USB DIG Platform do not need to be changed. You may want to change some of the jumpers on the

BUF12800 Test Board to match your specific configuration. For instance, you may wish to set a specific

I2C address.

Figure 8. Default Jumper Locations for BUF12800EVM

BUF12800EVM Hardware

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Table 4 summarizes the function of the BUF12800 Test Board jumpers. For most application, jumpers 2

through 5 are all set to the default positions.

Table 4. BUF12800 Test Board Jumper Functions

Jumper Default Purpose/Description

JMP1 INT This jumper selects whether the VSD pin on the

BUF12800 is connected to the VDUT signal

generated from the USB DIG Platform or whether

digital supply pin is connected to terminal T2,

allowing for an external supply to power the digital

circuitry. The default INT position connects the VSD

pin to the VDUT control signal.

JMP2 INT This jumper selects whether the SCL pin on the

BUF12800 is connected to the I2C_SCK_ISO signal

generated from the USB DIG Platform or whether

the SCL pin is connected to terminal T5, allowing

for an external source to control the I2C clock line.

The default INT position connects the SCL pin to

the I2C_SCK_ISO control signal.

JMP3 INT This jumper selects whether the SDA pin on the

BUF12800 is connected to the I2C_SDA_ISO signal

generated from the USB DIG Platform or whether

the SDA pin is connected to terminal T5, allowing

for an external source to control the I2C data line.

The default INT position connects the SDA pin to

the I2C_SDA_ISO control signal.

JMP4 INT This jumper selects whether the LD pin on the

BUF12800 is connected to jumper JMP5 or whether

the LD pin is connected to terminal T3, allowing for

an external source to control the latch pin. The

default INT position connects the LD pin to jumper

JMP5.

JMP5 L This jumper selection depends on the configuration

of JMP4. If JMP4 is set to INT, JMP5 is used to

select whether or not the LD pin on the BUF12800

is connected to the VSD digital supply or whether the

LD pin is connected to ground. The default LOW

position connects the LD pin to ground. If JMP4 is

set to the EXT position, JMP4 is not used.

JMP6 0 This jumper selects I2C A0 address selection. Two

separate I2C addresses can be selected, depending

upon whether JMP6 is set high or low.

JMP7 INT This jumper selects whether or not the RefH pin on

the BUF12800 is connected to the VSsignal

generated by the external analog power-supply

input at terminal T1, or whether the RefH pin is

connected to a user-designated reference, which is

set using an external input at terminal T4 as well as

resistors R1 and R2. The default INT position

connects the RefH pin to the external power-supply

input at terminal T1.

JMP8 INT This jumper selects whether or not the RefL pin on

the BUF12800 is connected to ground or whether

the RefL pin is connected to a user-designated

reference, which is set using an external input at

terminal T4 as well as resistors R3 and R4. The

default INT position connects the RefL pin to

ground.

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