Texas Instruments DAC80501EVM Manuel utilisateur

SLAU795–November 2018

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

SLAU795–November 2018

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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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

SLAU795–November 2018

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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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

SLAU795–November 2018

DAC80501EVM

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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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

SLAU795–November 2018

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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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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