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.
2
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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
4
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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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®
10
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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3.6 BUF20800/20820EVM Default Jumper Settings
Figure 9 shows the default jumpers configuration for the BUF20800/20820EVM. In general, the jumper
settings of the USB_DIG_Platform will not need to be changed. You may want to change some of the
jumpers on the BUF20800/20820EVM board to match your specific configuration. For instance, you may
wish to set a specific I2C address on the DUT.
BUF20800/20820EVM Hardware Overview
Figure 9. BUF20800/20820EVM Default Jumper Settings
Jumpers 1 through 4 on the BUF20800/20820EVM are all typically set to the same position. When set to
the INT position, the signals from the digital supply (JMP1) and the digital communication lines
(JMP2-JMP4) are generated and controlled from the USB_DIG_Platform or by the onboard bank select
switch. When these jumpers are set the EXT position, the signals from JMP1-JPM4 connect to the
terminal strips T2, T3, and T4. Jumper 6 controls the I2C address pin for the BUF20800/20820; this jumper
can set the address for A0 to either high or low. Jumper 5 can be set to low or high to hard set the LD
signal to the BUF20800/20820 as long as JMP4 is configured correctly.
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BUF20800/20820EVM Hardware Overview
Table 3 summarizes the function of the BUF20800/20820EVM board jumpers. For most application,
Jumpers 2 through 5 are all set to the default positions.
Table 3. BUF20800/20820EVM Test Board Jumper Functions
Jumper Default Purpose
JMP1 INT This jumper selects whether the DVDDdigital supply pin on the
JMP2 INT This jumper selects whether the SCL pin on the BU20800 or
JMP3 INT This jumper selects whether the SDA pin on the BUF20800 or
JMP4 INT This jumper selects whether the LD pin on the BUF20800 or
JMP5 L This jumper selection depends on the configuration of JMP4. In
JMP6 0 This jumper selects the I2C A0 address selection. Two separate
JMP7 INT This jumper selects whether or not the RefH pin on the
JMP8 INT This jumper selects whether or not the RefL pin on the
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BUF20800 or BUF20820 is connected to the V
generated from the USB_DIG_Platform or whether DVDDis
DUT
signal
connected to terminal T2 to allow for an external supply to power
the digital circuitry. The default INT position connects the DV
pin to the V
control signal
DUT
DD
BUF20820 is connected to the I2C_SCK_ISO signal generated
from the USB_DIG_Platform or whether the SCL pin is
connected to terminal T4 to allow 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.
BUF20820 is connected to the I2C_SDA_ISO signal generated
from the USB_DIG_Platform or whether the SDA pin is
connected to terminal T4 to allow 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.
BUF20820 is connected to jumper JMP5 or whether the LD pin
is connected to terminal T3 to allow for an external source to
control the latch pin. The default INT position connects the LD
pin to jumper JMP5.
the event that JMP4 is set to INT, JMP5 is used to select
whether or not the LD pin on the BUF20800 or BUF20820 is
connected to the DVDDdigital 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.
I2C addresses can be selected depending on whether JMP6 is
set high or low.
BUF20800 is connected or BUF20820 to the AVDDsignal
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 T5 as
well as resistors R1 and R2. The default INT position connects
the RefH pin to the external power-supply input at terminal T1.
BUF20800 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 T5 as well as resistors R3 and R4. The
default INT position connects the RefL pin to ground.
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Table 4 summarizes the function of the USB_DIG_Platform jumpers. For most applications, the default
jumper position should be used. A separate document (SBOU058) gives details regarding the operation
and design of the USB_DIG_Platform.
BUF20800/20820EVM Hardware Overview
Table 4. USB_DIG_Platform Jumper Functions
Jumper Default Purpose
This jumper selects external power or bus power.
JUMP1 EXT
JUMP2 EXT Same as JUMP1.
JUMP3 EE ON
JUMP4, JUMP5 L, L The only reason to change from the default setting
JUMP9 5V
JUMP10 WP ON This write protects the firmware EEPROM.
JUMP11 WP ON This write protects the calibration EEPROM.
JUMP13 REG supply. The USB bus can be used as the V
JUMP14 9V
JUMP17 BUS
JUMP18 V
(1)
CAUTION: Adjusting outside of this range will damage the EVM.
DUT
External power is applied on J5 or T3 (9V dc). Bus
power is 5V from the USB bus. External power is
typically used because the USB Bus power is noisy.
This jumper determines where the TUSB3210 will
load the USB_DIG_Platform firmware upon
power-up or reset. The EE Off position is used for
development for development or firmware update.
This jumper sets the address for the USB board.
is if multiple boards are being used.
This jumper selects the voltage of the device under
test supply (V
typically the only jumper that is changed for most
applications.
Uses the regulator output to generate the V
supply.
Uses the external power (9V as opposed to the
bus).
While in the BUS position V
While in the V
connected to an external source. This configuration
allows for any value of V
Connects the pull-up on GPIO to the V
the VCCsupply.
= 5V or 3V). This jumper is
DUT
operation is normal.
position the V
RAW
DUT
DUT
between 3V and 5V.
DUT
supply is
DUT
DUT
DUT
(1)
supply or
3.7 BUF20800/20820EVM Features
This section describes some of the hardware features present on the BUF20800/20820 test board.
3.7.1 JMP1: DVDDControl Setting
Jumper JMP1 selects where the BUF20800 or BUF20820 digital supply pin is connected. If JMP1 is set to
the INT position, the DVDDpin is connected to the switchable V
USB_DIG_Platform. This voltage can be set to either +3.3V or +5V depending on how JMP9 on the
USB_DIG_Platform is set. While JMP1 is set to the INT position, the DVDDPower button in the
BUF20800/20820 software is able to control whether the V
DUT
When JMP1 is set in the EXT position, an external supply connected to terminal T1 can be used to
provide the digital supply voltage for the BUF20800 or BUF20820.
3.7.2 JMP2: I2C SCL Control Setting
Jumper JMP2 selects where the BUF20800 or BUF20820 I2C SCL pin is connected. If JMP2 is set to the
INT position, the I2C clock signal is generated from the I2C_SCK_ISO signal from the USB_DIG_Platform.
When JMP2 is set to the EXT position, an external source connected to SCL pin of terminal T4 can be
used to provide the I2C SCK signal for the BUF20800 or BUF20820.
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signal generated from the
DUT
supply voltage is turned on or off.
13
RefH = V
SUP_H
R2
R1 + R2
(
(
BUF20800/20820EVM Hardware Overview
3.7.3 JMP3: I2C SDA Control Setting
Jumper JMP3 selects where the BUF20800 or BUF20820 I2C SDA pin is connected. If JMP4 is set in the
INT position, the I2C data signal is generated from the I2C_SDA_ISO signal from the USB_DIG_Platform.
When JMP3 is set in the EXT position, an external source connected to SDA pin of terminal T4 can be
used to provide the I2C SDA signal for the BUF20800 or BUF20820.
3.7.4 JMP4: LD Control Setting
Jumper JMP4 selects which input the LD latch pin of the BUF20800 or BUF20820 is connected to. If
JMP4 is set in the INT position, it is routed through the JMP5 jumper where the reference voltage can be
set high or low (see Section 3.7.5).
When JMP4 is set to the EXT position, an external source connected to the LD pin of terminal T3 can be
used to provide a reference voltage for the latch pin, which dictates the method by which the DAC output
voltage is updated.
3.7.5 JMP5: LD Reference Setting
Jumper JMP5 is used to select the reference voltage that is connected to the LD latch pin. It is used only
when jumper JMP4 is set to INT. If JMP5 is set to H, the latch pin is connected to the DVDDsupply
voltage, which allows all DAC output voltages to retain the respective values during data transfer until LD
sees a low reference (such as when JMP5 is set to the L position).
When JMP5 is set to the L position, the LD latch pin is connected to ground, which then updates each
DAC output voltage whenever its corresponding register is updated.
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3.7.6 JMP6: I2C Address Hardware Setting
Jumper JMP6 is used to set the hardware setting for the A0 I2C address pin on the BUF20800 or
BUF20820. Using JMP6, the A0 address can be set to either logic '1' or logic '0' to allow for two unique I2C
addresses. See Section 5.2.1 on how to configure the BUF20800/20820EVM software to match the JMP6
hardware setting.
3.7.7 JMP7: RefH Control Setting
Jumper JMP7 selects where the BUF20800 or BUF20820 high reference supply pin RefH is connected. If
JMP7 is set to the INT position, RefH is connected to AVDD, the external analog supply input at terminal
T1.
When JMP7 is set to the EXT position, the reference voltage is then designated by using the RefH pin of
terminal T5 along with resistors R1 and R2. An external power supply is connected to the RefH pin of
terminal T5, and R1 and R2 act as a voltage-divider circuit; the user sets the values of R1 and R2 to
achieve the desired reference voltage using Equation 1:
Where V
is the input supply voltage seen at the RefH pin of terminal T5.
SUP_H
(1)
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RefL = V
SUP_L
R4
R3 + R4
(
(
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3.7.8 JMP8: RefL Control Setting
Jumper JMP8 selects where the BUF20800 or BUF20820 low reference supply pin RefL is connected. If
JMP8 is set to the INT position, RefL is connected to ground.
When JMP8 is set to the EXT position, the reference voltage is then designated by using the RefL pin of
terminal T5 along with resistors R3 and R4. An external power supply is connected to the RefH pin of
terminal T5, and R3 and R4 act as a voltage-divider circuit; the user sets the values of R3 and R4 to
achieve the desired reference voltage using Equation 2:
Where V
is the input supply voltage seen at the RefL pin of terminal T5.
SUP_L
3.7.9 BUF20800/20820 Device Placement
The BUF20800/20820EVM offers the user two separate locations on the PCB where the BUF20800 of
BUF20820 test device can be installed. The U1 location on the BUF20800/20820EVM test board is a
38-pin, QFN/MLF test socket that allows the user to evaluate and program many devices very quickly.
One drawback to this socket is that there is no connection to the PowerPAD™ of the BUF20800 or
BUF20820 DUT. Because of this limitation, while in this socket, the BUF20800/20820 device cannot
operate at its full output capability as a result of thermal dissipation restrictions.
The U2 location allows for a BUF20800 or BUF20820 device that is soldered down on a DIP adapter
board to be installed on the BUF20800/20820EVM test board. The output capability of the BUF20800 or
BUF20820 device that is soldered on this adapter board can be fully evaluated. The PowerPAD of this
soldered BUF20800/20820 unit is connected correctly, allowing the device to dissipate the necessary
power while being evaluated.
BUF20800/20820EVM Software
(2)
Only one location should be populated at a time. The use of both locations
simultaneously will damage one or both of the devices being tested.
3.7.10 Terminal Strip TPG1
Terminal strip TPG1 provides the individual output signals on a single row of headers as well as a row of
vias. This footprint provides the user with multiple options regarding how to interface the output signals of
the BUF20800 or BUF20820 with the available display panel. Users can develop a custom cable to
connect the headers to their respective panels directly, or to solder directly to the individual vias.
4 BUF20800/20820EVM Software
4.1 Hardware Requirements
The BUF20800/20820EVM software has been tested on Microsoft®Windows®XP, Vista, and Windows 7
operating systems (OS) with United States and European regional settings.
4.2 Software Installation
The BUF20800/20820EVM software is included on the CD that is shipped with the EVM kit. It is also
available through the BUF20800/20820EVM product folder on the TI web site. To install the software to a
computer, insert the disc into an available CD-ROM drive. Navigate to the drive contents and open the
BUF20800/20820EVM software folder. Locate the compressed file (BUF20800/20820EVM.zip) and open it
using WinZIP®or a similar file compression program; extract the BUF20800/20820EVM files into a specific
BUF20800/20820EVM folder (for example, C:\BUF20800/20820EVM) on your hard drive.
CAUTION
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BUF20800/20820EVM Software
Once the files are extracted, navigate to the BUF20800/20820EVM folder you created on the hard drive.
Locate the setup.exe file and execute it to start the installation, as shown in Figure 10.
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Figure 10. BUF20800/20820EVM Software Installation
After the installation process initializes, the user is given the choice of selecting the directory in which to
install the program; the default location is C:\Program Files\BUF208xx\ and C:\Program Files\National
Instruments\. Following this option, two license agreements are presented that must be accepted, as
shown in Figure 11. After accepting the Texas Instruments and National Instruments license agreements,
the progress bar opens and shows the installation of the software, as Figure 12 illustrates. Once the
installation process is completed, click Finish.
16
Figure 11. BUF20800/20820EVM License Agreements
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BUF20800/20820EVM Software Overview
Figure 12. BUF20800/20820EVM Software Installation Progress
4.3 Software Description and Set-Up
The BUF20800/20820EVM software allows the user to read and write to all registers in the
BUF20800/20820 gamma correction buffer. Furthermore, it allows programming of the OTP register on the
BUF20820. The software also permits the user to select either I2C address. Press the About button, as
shown in Figure 13, to verify that you have the latest version of the software.
Figure 13. BUF20800/20820EVM Software About Button
5 BUF20800/20820EVM Software Overview
This section discusses how to use the BUF20800/20820EVM software.
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BUF20800/20820EVM Software Overview
5.1 Starting the BUF20800/20820EVM Software
The BUF20800/20820 software can be operated through the Windows Start menu. From Start, select All
Programs; then select the BUF20800/20820EVM program. Figure 14 illustrates how the software should
appear if the BUF20800/20820EVM is functioning properly.
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Figure 14. BUF20800/20820EVM Software Interface
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Figure 15 shows an error that pops up if the computer cannot communicate with the EVM. If you receive
this error, first check to see that the USB cable is properly connected on both ends. This error can also
occur if you connect the USB cable before the USB_DIG_Platform power source. Another possible source
for this error is a problem with your PC USB Human Interface Device driver. Make sure that the device is
recognized when the USB cable is plugged in; recognition is indicated by a Windows-generated
confirmation sound.
Figure 15. BUF20800/20820EVM Software: Communication Error with the USB_DIG_Platform
5.2 Using the BUF20800/20820 Software
5.2.1 I2C Address Selection
As mentioned previously in the BUF20800/20820EVM Features section (see Section 3.7), jumper JMP6 is
used to set the I2C address pin of the BUF20800/20820 . Figure 16 shows how the hardware and software
must both be set to allow for communication between the BUF20800/20820EVM and the software.
Without jumper JMP6 and the software address button configured correctly, the software will not be able
to communicate with the BUF20800/20820 device.
BUF20800/20820EVM Software Overview
Figure 16. Software Setting for JMP6 Low
When JMP6 is set high and the software is set as shown in Figure 17, the second I2C address can be
configured.
Figure 17. Software Setting for JMP6 High
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V
OUT
=
V V
1024
REFH REFL
-
? Decimal Value of Code + V
REFL
V
OUT
=
15 0
1024
-
? 68 + 0 =
1020
1024
= 0.996
BUF20800/20820EVM Software Overview
5.2.2 Measuring the Power Supply
You must measure the power supply (VS) with respect to the GND on the BUF20800/20820EVM board
and enter it in the V
field located in the top section of the software interface, as shown in Figure 18.
SUP
Figure 18. Measuring and Entering Power-Supply Voltage
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The voltage out of each DAC is calculated according to the V
These values exist as a window for maximum and minimum levels that the voltage can achieve. These
maximum and minimum levels are then multiplied by the decimal code to determine the DAC voltage. The
calculation is performed according to Equation 3.
For example, changing the value in the channel 6 cell, with V
immediately changes the output of channel 6 to 0.996V.
Example: Channel 6: Code 44 (hexadecimal) = 68 (decimal)
5.2.3 Read DAC Button
By pressing the Read DAC button in the BUF20800/20820EVM software, all of the BUF20800/20820
DAC/V
registers are read to obtain the respective current register contents. Once the read procedure is
COM
complete, all of the corresponding text boxes are updated to show the current values present in the
DAC/V
COM
registers.
REFH
REFH
and the V
and V
REFL
scaled values entered.
REFL
connected internally,
(3)
20
BUF20800/20820EVM User Guide and Software Tutorial SBOU100–April 2011
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5.2.4 Write DAC Button
The method used to write the values in the DAC/V
feature is enabled. The BUF20800/20820 has two methods of writing information into the DAC/V
registers. The first method allows for the output voltage to change immediately after the writing to the DAC
register. In the BUF20800/20820EVM software, this mode is configured by enabling the Auto Write feature
found in the Buffer Menu dropdown menu. In this mode, as an individual channel is written to, the output
voltage changes as soon as the user moves to a different text box in the software. The second method of
writing to the DAC/V
output voltages change at the same time, rather than each channel voltage changing as soon as it is
written to.
Disabling the Auto Write feature in the software allows the user to enter all of the values desired for all of
the channels and then press the Write DAC button to change all of the output voltage of all of the
channels at one time. When the Auto Write feature is enabled, no change occurs to the output voltages
when the Write DAC button is pressed. No change occurs because after the text box for a given channel
has been updated, as soon as another item in the software is clicked, the Auto Write feature automatically
performs a write command to the updated channel that then updates the output voltage. When in the Auto
Write enabled mode, the Write DAC button cannot be pressed with different data in the corresponding
channel text boxes than the values already stored in the DAC/V
Figure 19 shows the location in the Buffer Menu showing the Auto Write feature enabled. Clicking on the
Auto Write feature again enables/disables the feature, depending on its current state.
BUF20800/20820EVM Software Overview
registers is based on whether or not the Auto Write
COM
registers allows for the user to write multiple channels and then have all of the
COM
register; thus, no change occurs.
COM
COM
5.2.5 Reset Button
Pressing the Reset button in the BUF20800/20820EVM software performs two functions. The first function
is to call a General-Call Reset for the BUF20800 or BUF20820. The status of the DAC/V
this General-Call Reset has been used depends on the DUT on the EVM.
If the BUF20800 is in the test board, the channel registers default to 1000000000, or mid-supply.
If the BUF20820 is in the test board, the status of the DAC/V
depends on whether or not the OTP has been programmed. If the OTP has been programmed, the
channel registers are loaded with the last values programmed into the OTP memory. If the OTP memory
has not been programmed, the channel registers will default to 1000000000, or mid-supply.
The second function performed after the reset button is pressed is that a Read DAC call is made to
update the corresponding channel text boxes to the current value for each channel. This function is valid
for both the BUF20800 and the BUF20820 device.
Figure 19. Auto Write Feature Enabled
registers after this General-Call Reset
COM
registers after
COM
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BUF20800/20820EVM Software Overview
5.2.6 Save to File Button
The register configurations of the BUF20800/20820 DACs are displayed in both analog voltage and in
hexadecimal. The DAC codes (that is, gamma voltages) can be saved into a text file using the Save to
File button.
Pressing the Save to File button opens a file-save dialog box similar to that shown in Figure 20. Pressing
the folder icon creates a new folder on your PC. It is a good idea to create a directory exclusively for
BUF20800/20820 DAC code (that is, gamma voltage) files. Enter a unique file name in the File name field
to store your BUF20800/20820 register information. Press the OK button to save the file.
Figure 20. Save to File Dialog Box Button and Window
Saved BUF20800/20820 DAC codes (gamma voltages) exist in a text file that can be opened in a text
editor, as Figure 21 illustrates.
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Figure 21. File Format of Saved Data
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5.2.7 Load From File Button
The BUF20800/20820EVM software is also able to load data saved from previous evaluations. A saved
register configuration can be loaded into the BUF20800/20820 using the Load From File button, as
shown in Figure 22. The program remembers where you saved the last register configuration. Simply
select the desired configuration and press Open.
BUF20800/20820EVM Software Overview
5.2.8 Changing the DAC/V
The voltage of any of the DAC or V
the voltage by entering the desired voltage directly in the voltage text box. In order to be able to manually
type the voltage into the text box, you must first click on the cell to be edited. Click a second time and the
cell turns from blue to black, and allows the user to type the updated voltage in the cell. The hexadecimal
DAC codes can be entered in the Code column in the same manner.
Another method of changing the voltage of a DAC or V
main software window. There is only a single slider that is used for all channels. In order to use the slider
to adjust the voltage of a particular channel, that channel must first be selected. To select a channel, click
on either the channel number, voltage, or code of a particular channel. The entire channel row highlights
in blue to show the user that the channel is selected. Adjusting the slider bar then only updates the
highlighted channel.
The final method to change DAC/V
software window. These buttons allow for fine and coarse adjustments, respectively, to the highlighted
channel, giving the user the ability to quickly step the channel output up or down as needed without
having to manually enter the changes in the Code column.
Figure 22. Load From File Button and Window
Analog Voltage
COM
channels can be adjusted in several ways. First, you can change
COM
channel is through the use of the slider on the
COM
voltages is through the ±1 Code and ±5 Code buttons on the main
COM
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BUF20800/20820EVM Software Overview
5.2.9 Run Batch Button
The Run Batch button (as highlighted in Figure 23) enables the user to configure the BUF20800 of
BUF20820 to cycle through different register configurations in a continuous loop. When connected to the
end application, this feature can be used to cycle through different gamma settings to determine what the
optimal settings must be for a given application.
When the Run Batch button is pressed, a new dialog box displays as Figure 23 shows. The delay time is
the amount of time allowed between loading new configurations into the BUF20800/20820 DUT.
Use the Single Step Up and Single Step Down buttons to step through the selected files manually. The
currently-selected file name is displayed in the lower left corner area of the dialog box. Double-click on the
file names to select them. Once a series of filenames have been selected, the check box turns dark.
Double-click on a filename again to unselect it from the batch run.
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Figure 23. Run Batch Dialog Button and Window
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5.2.10 Control Panel Button
Pressing the Control Panel button brings up a display panel that allows you to adjust each channel using
a set of graphical sliders, as shown in Figure 24. Simply drag the slider to adjust the desired channel
output. The DAC code and corresponding output value of each channel change automatically. This
function is similar to the slider present on the primary BUF20800/20820EVM software window that
changes based on the channel that highlighted (as discussed in the above section).
BUF20800/20820EVM Software Overview
Figure 24. Control Panel Button and Window
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BUF20800/20820EVM Software Overview
5.2.11 Program OTP All Channels Button (BUF20820 DUT Only)
To configure the BUF20820 Program OTP function, make sure the device inserted into the
BUF20800/20820 test board is the BUF20820. Also, be sure the BUF20820 is selected from the Buffer
Model menu. As Figure 25 shows, pressing the Program OTP All Channels button allows you to program
a gamma curve into the nonvolatile memory of the BUF20820. All 18 channels (including the V
channels) are then programmed simultaneously. The values are stored in the memory bank.
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COM
26
Figure 25. Program OTP All Channels (BUF20820 DUT Only)
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6 BUF20800/20820EVM Documentation
This section contains the complete bill of materials and schematic diagram for the BUF20800/20820EVM.
Documentation information for the USB_DIG_Platform can be found in the USB_DIG_Platform User’s
Guide, SBOU058, available at the TI web site at http://www.ti.com.
6.1 Schematic
Figure 26 shows the schematic for the BUF20800/20820EVM.
BUF20800/20820EVM Documentation
Figure 26. BUF20800/20820EVM Schematic
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BUF20800/20820EVM Documentation
6.2 PCB Layouts
Figure 27 shows the PCB component layout of the BUF20800/20820EVM.
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Figure 27. BUF20800/20820EVM PCB Top Layer (Component Side)
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BUF20800/20820EVM Documentation
6.3 Bill of Materials
Table 5 lists the bill of materials for this EVM.
Table 5. Bill of Materials
Item No Count Value RefDes Description Part Number Mfr
1 4 R1-R4 Resistor, 1/16W .5% 0603 SMD Varies SusumuCo Ltd
2 2 4.7μF C1, C2 Capacitor, Tantalum 4.7μF 35V 10% 293D475X9035C2TE3 Vishay/Sprague
3 2 1μF C3, C4 Capacitor, Ceramic 1μF 25V Y5V 0603 GRM188F51E105ZA12D Murata Electronics North
4 6 0.1μF C5-C10 Capacitor, .10μF 25V Ceramic Y5V 0603 C0603C104Z3VACTU Kemet
5 1 U1 Socket, TSSOP 38-Pin ZIF OTS-38(28)-0.65-01 ENPLAS
6 2 U2 Connector, Rcpt .100" 19-Position Gold SS-119-G-2 Samtec
7 1 DSUB25M J1 Connector, D-SUB plug R/A 25-Position 5747842-4 AMP/Tyco Electronics
8 4 T1, T2, T3, T5 Terminal Block 5MM 2-Position ED300/2 On-Shore Technology Inc
9 1 T4 Terminal Block 5MM 3-Position ED300/3 On-Shore Technology Inc
10 1 Strip cut to TPG1 Connector, Header 20-Position .100" TSW-120-07-G-S Samtec
size SGL Gold
11 10 TP cut to Test Points, All Connector, Header 1-Position .100" SGL TSW-101-07-G-S Samtec
size Gold
12 4 Standoff None Standoffs, Hex , 4-40 Threaded, 0.500" 2203 Keystone
13 4 Screw None Screw Machine Phillips 4-40 × 1/4 SS PMSSS 440 0025 PH B & F Fastener Supply
14 8 Strip cut to JMP1- JMP8 Connector, Header 3-Position .100" SGL TSW-103-07-G-S Samtec
size Gold
15 8 Jumper JMP1- JMP8 LP W/Handle 2-Position 881545-2 AMP/Tyco Electronics
SMD
America
T/H
30 Gold (with threaded inserts and board
locks)
length, 0.250" OD, Aluminum Iridite
Finish
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Evaluation Board/Kit Important Notice
Texas Instruments (TI) provides the enclosed product(s) under the following conditions:
This evaluation board/kit is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION, OR EVALUATION
PURPOSES ONLY and is not considered by TI to be a finished end-product fit for general consumer use. Persons handling the
product(s) must have electronics training and observe good engineering practice standards. As such, the goods being provided are
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EVM Warnings and Restrictions
It is important to operate this EVM within the input voltage range of 7V (min) to 18V (max) and the output voltage range of 7V (min)
to 18V (max).
Exceeding the specified input range may cause unexpected operation and/or irreversible damage to the EVM. If there are
questions concerning the input range, please contact a TI field representative prior to connecting the input power.
Applying loads outside of the specified output range may result in unintended operation and/or possible permanent damage to the
EVM. Please consult the EVM User's Guide prior to connecting any load to the EVM output. If there is uncertainty as to the load
specification, please contact a TI field representative.
During normal operation, some circuit components may have case temperatures greater than +25°C. The EVM is designed to
operate properly with certain components above +25°C as long as the input and output ranges are maintained. These components
include but are not limited to linear regulators, switching transistors, pass transistors, and current sense resistors. These types of
devices can be identified using the EVM schematic located in the EVM User's Guide. When placing measurement probes near
these devices during operation, please be aware that these devices may be very warm to the touch.
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