Texas Instruments DAC80501EVM Manuel utilisateur
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SLAU795–November 2018
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DAC80501EVM
User's Guide
SLAU795–November 2018
DAC80501EVM
This user's guide describes the characteristics, operation, and use of the DAC80501 evaluation module
(EVM). This document also discusses the proper setup and configuration of both software and hardware,
and reviews various aspects of program operation. Throughout this document, the terms evaluation board,
evaluation module, and EVM are synonymous with the DAC80501EVM. A complete circuit description,
schematic diagram, and bill of materials are also included in this document.
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DAC80501EVM
Contents
1 Overview ..................................................................................................................... 3
2 System Setup ................................................................................................................ 4
3 Detailed Description......................................................................................................... 6
4 Schematic, PCB Layout, and Bill of Materials.......................................................................... 11
List of Figures
1 DAC80501EVM Hardware Setup.......................................................................................... 4
2 Launching Software Setup ................................................................................................. 5
3 DAC80501EVM Installation Path.......................................................................................... 5
4 DAC80501EVM Hardware Block Diagram ............................................................................... 6
5 DAC80501EVM GUI Location.............................................................................................. 8
6 DAC80501EVM GUI Connection Detection.............................................................................. 8
7 DAC80501EVM Software Page Selection................................................................................ 9
8 Low Level Configuration Page............................................................................................. 9
9 Low Level Configuration Page Options ................................................................................. 10
10 High Level Configuration Page........................................................................................... 10
11 DAC80501EVM Board Schematic ....................................................................................... 11
12 DAC80501EVM PCB Components Layout ............................................................................. 12
13 Top Layer ................................................................................................................... 12
14 Bottom Layer................................................................................................................ 13
List of Tables
1 Contents of DAC80501EVM Kit............................................................................................ 3
2 Required Components Not Part of the DAC80501EVM Kit............................................................ 3
3 Related Documentation..................................................................................................... 3
4 Power Supply Inputs ........................................................................................................ 4
5 Jumper Settings.............................................................................................................. 6
6 J8 (USB2ANY) Pin Definitions............................................................................................. 7
7 J1 SPI Signal Test Points .................................................................................................. 7
8 J3 Pin Definitions ............................................................................................................ 7
9 DAC80501 EVM Bill of Materials......................................................................................... 14
Trademarks
Windows is a trademark of Microsoft Corporation.
All other trademarks are the property of their respective owners.
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Overview
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DAC80501EVM
1 Overview
The DAC80501EVM is an easy to use platform for evaluating the functionality and performance of the
DAC80501 device. The DAC80501 is a single-channel, buffered, digital-to-analog converter (DAC) in 16-
bit resolution with 2.5-V internal reference. This EVM provides output voltage from 0 - 5V. It also provides
the SPI programming interface using a PC-based graphical user interface (GUI).
1.1 Kit Contents
Table 1 details the contents of the EVM kit. Contact the TI Product Information Center nearest you if any
component is missing. TI highly recommends that the user verify latest versions of the related software at
the TI website, www.ti.com.
Table 1. Contents of DAC80501EVM Kit
Item Quantity
DAC80501EVM evaluation board PCB 1
Table 2. Required Components Not Part of the
DAC80501EVM Kit
Item Quantity
USB2ANY interface adapter 1
1.2 Related Documentation from Texas Instruments
The following document provides information regarding Texas Instruments integrated circuits used in the
assembly of the DAC80501EVM. This user's guide is available from the TI web site under literature
number SLAU795. 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 at http://www.ti.com/, 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 3. Related Documentation
Document Literature Number
DAC80501 product data sheet SBAS794
USB2ANY POWER SUPPLY
(Optional)
System Setup
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DAC80501EVM
2 System Setup
2.1 Hardware Setup
This section provides the overall system setup for the EVM. A PC runs software that provides an interface
to the USB2ANY platform. This platform generates the optional 3.3V power and digital signals used to
communicate with the EVM board. Connectors are included on the EVM board for external power
supplies. Figure 1 displays the system setup for the DAC80501EVM.
Figure 1. DAC80501EVM Hardware Setup
2.1.1 Connecting the Hardware
Connect the USB cable from the USB2ANY platform to the PC. To connect the USB2ANY to the EVM
board, align and firmly connect the keyed ribbon connector to the J8 connector. Verify the connection is
snug because loose connections may cause intermittent operation.
2.1.2 Power Configurations
The DAC80501EVM provides electrical connections to the device supply pins. The connectors and
optional configurations are shown in the Table 4. Note that the headroom between the reference and the
power supply needs to be maintained. Refer to datasheet for details.
Table 4. Power Supply Inputs
Connector/Pin Supply Name Voltage Range
J2.1 VDD 4.5-V to 5.5-V
J2.2 GND 0-V
J1.5 (Option) VDD (JP1 needs to be closed) 3.3-V
2.1.3 Electrostatic Discharge Warning
Many of the components on the DAC80501EVM are susceptible to damage by electrostatic discharge
(ESD). Observe proper ESD handling precautions when unpacking and handling the EVM, including the
use of a grounded wrist strap at an approved ESD workstation.
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System Setup
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DAC80501EVM
2.2 Software Setup
This section provides the procedure for EVM software installation.
2.2.1 Operating Systems Requirements
The EVM software is compatible with the Windows™ 7, Windows 8, and Windows 10 operating systems.
2.2.2 Software Installation
The software is available through the EVM product folder on the TI website. After the software is
downloaded onto the PC, navigate to the DAC80501EVM folder, and run the Setup_DAC80501_EVM.exe
file, as shown in Figure 2. When the software is launched, an installation dialog window opens and
prompts the user to select an installation directory. If left unchanged, the software location defaults to
C:\Program Files (x86)\Texas Instruments\DAC80501 EVM as shown in Figure 3.
Figure 2. Launching Software Setup
The software installation automatically copies the required LabVIEW files and drivers to the local machine.
Make sure to verify that the USB2ANY is not connected before the software, or the file and driver
installation may be affected.
Figure 3. DAC80501EVM Installation Path
DAC80501
USB2ANY
Interface
Power
Input
On-board
Reference Jumper
Settings
Output
Interface
Detailed Description
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DAC80501EVM
3 Detailed Description
3.1 Hardware Description
The following sections provide detailed information on the EVM hardware and jumper configuration
settings. Table 5 displays the default configurations of all jumper connections on the DAC80501EVM.
Connect the USB cable from the USB2ANY to the PC.
Table 5. Jumper Settings
Jumper Default Position Available Option Description
JP1 Open: VDD is supplied externally
through J2 Closed: VDD should be supplied by
USB2ANY (the reference headroom
must be maintained) VDD Source Selection
JP2 Closed: SPI Enabled Open: I2C Enabled (Not supported
in the software) SPI or I2C Interface Selection
JP3 Open: SYNC/A0 HIGH Closed: SYNC/A0 LOW SYNC/A0 Level
JP4 Open: Internal Reference Closed: External On-board
Reference Reference Selection
3.1.1 Theory of Operation for DAC80501 Hardware
The block diagram of the DAC80501EVM board is displayed in Figure 4. The EVM board connects to
external power supply VDD either through USB2ANY (3.3V) or through JP2. Note that the headroom for
the reference needs to be maintained as specified in the datasheet. The 10-pin wire-to-board connector J1
provides an interface to the USB2ANY platform. The SPI signals are provided either by using the
USB2ANY header or the test points. There is an onboard 5-V reference source selected using JP4. JP4 is
open by default making the DAC work with the internal reference.
Figure 4. DAC80501EVM Hardware Block Diagram
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Detailed Description
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3.1.2 Signal Definition of USB2ANY
The DAC80501EVM provides a hardware connector (J1) that connects to the USB2ANY interface board
The USBANY platform supplies VIO power and is responsible for providing the SPI commands sent from
the PC GUI software. Optionally, the VDD supply can be provided through an external supply, and all
digital communication lines can be accessed through their respective digital test points. Table 6 provides
the pin definitions for this connector. Table 7 provides the corresponding test points for the SPI signals.
Table 6. J8 (USB2ANY) Pin Definitions
Pin# Signal Description
1 GPIO7 General purpose I/O
2 CS/GPIO6 /CS | General purpose I/O
3 RXD/MISO SPI MISO
4 TXD/MOSI SPI MOSI
5 3.3V 3.3V Supply
6 GND Ground
7 GPIO3 General purpose I/O
8 SCLK/GPIO2 SPI SCLK
9 GPIO1 General purpose I/O
10 GPIO0 General purpose I/O
Table 7. J1 SPI Signal Test Points
Test Points SPI Signal
TP1 SCLK
TP2, TP3 GND
TP4 MOSI/SDI
TP5 SYNC
3.1.3 DAC Signal Pins
The DAC80501EVM provides access to the DAC output through connection J3 as listed in Table 8.
Table 8. J3 Pin Definitions
Connector/Pin Signal Name
J3-1 VOUTA
J3-2 GND
Detailed Description
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DAC80501EVM
3.2 Software Description
This section describes the features of the DAC80501 EVM software, and discusses how to use these
features. The software provides basic control of all the registers and functions to the DAC80501 device.
3.2.1 Starting the Software
After the DAC80501EVM software is installed, a restart may be required by Windows. To launch the
software, locate the Texas Instruments folder in the All Programs menu, and select the DAC80501 EVM
icon.
Figure 5. DAC80501EVM GUI Location
Figure 6 shows that If the USB2ANY is correctly connected, the status bar at the bottom of the screen
displays HARDWARE CONNECTED. If the USB2ANY is not properly connected or not connected at all,
the status bar displays DEMO. If the GUI is not displaying the HARDWARE CONNECTED status while the
USB2ANY is connected, unplug and reconnect the USB2ANY and relaunch the GUI software.
Figure 6. DAC80501EVM GUI Connection Detection
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Detailed Description
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DAC80501EVM
3.2.2 Software Features
The DAC80501 EVM incorporates interactive functions that help configure the DAC80501 device. These
functions are built into several GUI pages, as shown in Figure 7. The Page Selection menu allows the
user to switch between the pages, with each page representing a feature of the software.
Figure 7. DAC80501EVM Software Page Selection
3.2.2.1 Low Level Configuration Page
The DAC80501 EVM Register Map page, shown in Figure 8, allows the user to access low level
communication directly with the DAC80501 registers. Selecting a register on the Register Map list shows a
description of the values in that register, as well as information on the register address, default value, size,
and current value. Values can be read and written to the registers by writing to the Value or bit field of the
GUI.
Figure 8. Low Level Configuration Page
Detailed Description
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DAC80501EVM
The values of the register map can also be saved by pressing the Save Configuration button under the
File menu option. Additionally, the configuration files can be accessed through the Load Configuration
button. Other options selectable by the user are the Update Mode,Write Selected,Read Selected,Write
Modified, and Read All buttons. All buttons are displayed in Figure 9.
Figure 9. Low Level Configuration Page Options
If Immediate is selected under Update Mode, all changes to register values update immediately. The
Deferred option allows the user to modify the value of a register without taking effect until the Write
Selected, or Write Modified button is pressed. The Read Selected button allows individual register reads,
whereas the Read All button reads the status of all registers located in the register map.
3.2.2.2 High Level Configuration Page
The High Level Configuration page provides an easy interface to program the output code for the
DAC80501 device. This page is displayed in Figure 10.
Figure 10. High Level Configuration Page
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