Texas Instruments BUF20800, BUF20820EVM User Manual

User's Guide
SBOU100–April 2011

BUF20800/20820EVM User Guide and Software Tutorial

This user's guide describes the characteristics, operation, and use of the BUF20800/20820EVM 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 BUF20800/20820EVM. This document 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 BUF20800/20820EVM Hardware Setup ................................................................................. 4
3 BUF20800/20820EVM Hardware Overview ............................................................................. 7
4 BUF20800/20820EVM Software ......................................................................................... 15
5 BUF20800/20820EVM Software Overview ............................................................................ 17
6 BUF20800/20820EVM Documentation ................................................................................. 27
List of Figures
1 Hardware Included with BUF20800/20820EVM Kit .................................................................... 3
2 BUF20800/20820EVM Hardware Setup ................................................................................. 4
3 BUF20800/20820EVM Board Block Diagram........................................................................... 5
4 USB_DIG_Platform Block Diagram....................................................................................... 7
5 Typical Hardware Connections for BUF20800/20820EVM............................................................ 8
6 Connecting External Power to the EVM ................................................................................. 9
7 Connecting the USB Cable to the USB_DIG_Platform............................................................... 10
8 Confirmation of USB_DIG_Platform Driver Installation............................................................... 10
9 BUF20800/20820EVM Default Jumper Settings ...................................................................... 11
10 BUF20800/20820EVM Software Installation........................................................................... 16
11 BUF20800/20820EVM License Agreements........................................................................... 16
12 BUF20800/20820EVM Software Installation Progress ............................................................... 17
13 BUF20800/20820EVM Software About Button ........................................................................ 17
14 BUF20800/20820EVM Software Interface ............................................................................. 18
15 BUF20800/20820EVM Software: Communication Error with the USB_DIG_Platform ........................... 19
16 Software Setting for JMP6 Low.......................................................................................... 19
17 Software Setting for JMP6 High ......................................................................................... 19
18 Measuring and Entering Power-Supply Voltage....................................................................... 20
19 Auto Write Feature Enabled ............................................................................................. 21
20 Save to File Dialog Box Button and Window .......................................................................... 22
21 File Format of Saved Data ............................................................................................... 22
22 Load From File Button and Window .................................................................................... 23
23 Run Batch Dialog Button and Window.................................................................................. 24
PowerPAD is a trademark of Texas Instruments. Microsoft, Windows are registered trademarks of Microsoft Corporation. I2C is a trademark of NXP Semiconductors. WinZIP is a registered trademark of WinZip International LLC. All other trademarks are the property of their respective owners.
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1
Overview
24 Control Panel Button and Window ...................................................................................... 25
25 Program OTP All Channels (BUF20820 DUT Only) .................................................................. 26
26 BUF20800/20820EVM Schematic....................................................................................... 27
27 BUF20800/20820EVM PCB Top Layer (Component Side).......................................................... 28
1 BUF20800/20820EVM Kit Contents...................................................................................... 3
2 Signal Definition of J1 (25-Pin Male DSUB) on BUF20800/20820EVM Board ..................................... 6
3 BUF20800/20820EVM Test Board Jumper Functions................................................................ 12
4 USB_DIG_Platform Jumper Functions ................................................................................. 13
5 Bill of Materials ............................................................................................................ 29

1 Overview

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List of Tables
The BUF20800 and BUF2082 are programmable gamma-voltage generators and V BUF20800 offers two banks of 18 programmable gamma channels and two programmable V
calibrators. The
COM
COM
channels, making it ideal for 10-bit source TFT-LCD reference drivers. The BUF20820 also features programmable OTP memory that allows the user to store the gamma voltages on-chip, which eliminates the need for an external EEPROM. The BUF20800/20820EVM is a platform for evaluating the performance of either the BUF20800 or BUF20820 under various signal, reference, and supply conditions. This document gives a general overview of the BUF20800/20820EVM, and provides a general description of the features and functions to be considered while using this evaluation module. Unless otherwise noted, all references to the device under test (DUT) apply to both the BUF20800 and the BUF20820.
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1.1 BUF20800/20820EVM Kit Contents

Table 1 summarizes the contents of the BUF20800/20820EVM kit. Figure 1 shows all of the included
hardware. Contact the Texas Instruments Product Information Center nearest you if any component is missing. It is highly recommended that you also check the BUF20800 product folder or the BUF20820
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. BUF20800/20820EVM Kit Contents
Item Quantity
BUF20800/20820 PCB Test Board 1
USB_DIG_Platform PCB 1
USB Cable 1
+6V Power Supply 1
User’s Guide CD-ROM 1
Overview
Figure 1. Hardware Included with BUF20800/20820EVM Kit
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3
+6V dc wall
supply
BUF20800/20820
Test Board
BUF20800/20820
Analog Supply
USB Dig Platform
Outputs
Measurement
Device
BUF20800/20820EVM Hardware Setup

1.2 Related Documentation from Texas Instruments

The following documents provide information regarding Texas Instruments' integrated circuits used in the assembly of the BUF20800/20820EVM. This user's guide is available from the TI web site under literature number SBOU100. 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.
Related Documentation
Document Literature Number
BUF20800/20820 Product Data SBOS329
Sheet
USB_DIG_Platform User Guide SBOU058

2 BUF20800/20820EVM Hardware Setup

Figure 2 shows the system setup for the BUF20800/20820EVM. 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 BUF20800/20820 board. Connectors on the BUF20800/20820 allow the user to connect to the system under test conditions where the power, current, and voltage are monitored.
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Figure 2. BUF20800/20820EVM Hardware Setup
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BUF20800/ BUF20820
J1
T4
TPG1
V Supply
(AV Power Supply)
DUT
DD
I C Interface
2
Test Outputs
I C A0 Address
Jumper
2
External BUF20800/20820
Analog Power Supply
Test Point
Header
25-Pin Male
DSUB
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2.1 Theory of Operation for BUF20800/20820 Hardware

A block diagram of the BUF20800/20820 test board hardware setup is shown in Figure 3. The functionality of the PCB is such that it provides connections to the I2C™ interface 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.
BUF20800/20820EVM Hardware Setup
Figure 3. BUF20800/20820EVM Board Block Diagram
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BUF20800/20820EVM Hardware Setup

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

Table 2 lists the different signals connected to J1 on the BUF20800/20820EVM test board.
Table 2. Signal Definition of J1 (25-Pin Male DSUB) on BUF20800/20820EVM
Board
Pin on J1 Signal BUF20800/20820 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
13 I2C_SDA_ISO 14 N/C No connection
15 N/C No connection 16 N/C No connection
17 V
18 V 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
DUT
CC
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I2C clock signal (SCL) channel 1; can be disconnected using a switch
I2C data signal (SDA) channel 1; can be disconnected using a switch
Switched 3V/5V power. Note that when power is switched off, digital I/O is also switched off.
No connection
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Adjustable
Regulator
TUSB3210
8052 Cm
with USB Interface
and UART
3.3V
Regulator
8K byte
EEPROM
V
CC
(2.7V to 5.5V)
V Cm
S
3.3V
V
USB
5V
V
DUT
(2.7V to 5.5V)
Reset Button and
Power-On Reset
Buffers and
Latches
Calibration
EEPROM
USB DIG Platform
Power
Switching
Switched Power
External
Power
(6V dc)
USB Bus
from
Computer
I C/SPI
2
Control and Measure Bits
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2.2.1 Theory of Operation for USB_DIG_Platform
Figure 4 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 4 gives a brief overview of the platform. The primary control device on the USB_DIG_Platform is the TUSB3210.
BUF20800/20820EVM Hardware Overview
Figure 4. USB_DIG_Platform Block Diagram

3 BUF20800/20820EVM Hardware Overview

The BUF20800/20820EVM hardware overview involves connecting the two PCBs of the EVM together, applying power, connecting the USB cable, and setting the jumpers. This section presents the details of this procedure.

3.1 Electrostatic Discharge Warning

Many of the components on the BUF20800/20820EVM 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.
CAUTION
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BUF20800/20820EVM Hardware Overview

3.2 Typical Hardware Connections

To set up the BUF20800/20820EVM hardware, connect the two PCBs of the EVM together, and apply a power source to the BUF20800/20820EVM test board. The external connections may be the real-world system that the BUF20800 or BUF20820 will be incorporated into. Figure 5 illustrates the typical hardware connections.
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Figure 5. Typical Hardware Connections for BUF20800/20820EVM
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3.3 Connecting the Hardware

To connect the two PCBs of the BUF20800/20820EVM together, gently push on both sides of the DSUB connectors (as shown in Figure 6). Note that the USB_DIG_Platform board has two DSUB connectors; either may be used. Make sure that the two connectors are completely pushed together; loose connections may cause intermittent operation.

3.4 Connecting Power

After the two parts of the BUF20800/20820EVM are conjoined, connect a +6V wall supply to the USB_DIG_Platform board, as Figure 6 shows. Always connect power before connecting the USB cable. If you connect the USB cable before connecting the power, the computer will attempt to communicate with an unpowered device that will not be able to respond.
In addition, the BUF20800/20820EVM also requires an external power source. This source is not included with the kit. Its voltage may differ depending on your testing needs, and it will be connected to the terminal T1.
BUF20800/20820EVM Hardware Overview
Figure 6. Connecting External Power to the EVM
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BUF20800/20820EVM Hardware Overview

3.5 Connecting the USB Cable to the BUF20800/20820EVM

Once power is connected, the USB cable must be connected to the USB_DIG_Platform, as shown in
Figure 7. Note that the BUF20800/20820EVM test board and the USB_DIG_Platform board must each be
powered on before connecting the USB cable. Typically, the computer will respond with a Found New
Hardware, USB Device pop-up dialog. The pop-up window typically changes to Found New Hardware, USB Human Interface Device. This pop-up 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.
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®
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Figure 7. Connecting the USB Cable to the USB_DIG_Platform
In some cases, the Windows Add Hardware Wizard may pop up. If this prompt appears, allow the system device manager to install the human interface drivers by clicking Yes when requested to install drivers. Windows will confirm installation of the drivers with the message shown in Figure 8.
Figure 8. Confirmation of USB_DIG_Platform Driver Installation
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