Texas Instruments DAC8771EVM Manuale utente

SLAU727–August 2017

DAC8771 Evaluation Module

User's Guide

SLAU727–August 2017

DAC8771 Evaluation Module

This user’s guide describes the characteristics and use of the DAC8771 evaluation board (EVM). It also

discusses how to setup and configure the software and hardware for proper operation. Throughout this

document, the terms evaluation board,evaluation module, and EVM are synonymous with the

DAC8771EVM.

Contents

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

2 EVM Hardware Overview................................................................................................... 3

3 EVM Software Setup ........................................................................................................ 9

4 EVM Software Overview .................................................................................................. 11

5 EVM Documentation....................................................................................................... 14

List of Figures

1 DAC8771EVM Hardware Setup ........................................................................................... 3

2 DAC8771EVM Block Diagram ............................................................................................. 3

3 PVDD/AVDD, and DVDD Supply Connections.......................................................................... 5

4 Digital Communication Test Points........................................................................................ 6

5 Onboard Reference Supply Connections................................................................................. 7

6 Output Terminal Block Connections and Load Jumpers ............................................................... 7

7 SM-USB-DIG Connection................................................................................................... 8

8 DAC8771EVM Installer ..................................................................................................... 9

9 DAC8771EVM Install Path................................................................................................ 10

10 DAC8771EVM Software License Agreements ......................................................................... 10

11 EVM GUI – Front Panel ................................................................................................... 11

12 Schematic 1................................................................................................................. 14

13 Schematic 2................................................................................................................. 15

14 DAC8771EVM PCB Components Layout............................................................................... 16

List of Tables

1 Contents of DAC8771EVM Kit............................................................................................. 2

2 Related Documentation..................................................................................................... 2

3 EVM Jumper Summary ..................................................................................................... 4

4 SM-USB-DIG Connector.................................................................................................... 8

5 EVM Board Bill of Materials............................................................................................... 17

Overview

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Trademarks

Microsoft, Windows are registered trademarks of Microsoft Corporation.

1 Overview

The DAC8771 is a single-channel (quad) 16-bit precision digital-to-analog converter (DAC). The output

can be configured to produce a current in output ranges of 0 to 20 mA, 0 to 24 mA, 3.5 to 23.5 mA, or ±24

mA. It can also be configured for voltage output in ranges of 0 to 5 V, 0 to 6 V, 0 to 10 V, 0 to 12 V, ±5 V,

±6 V, ±10 V, or ±12 V. The DAC8771 includes an integrated buck-boost converter to generate all

necessary power supplies from a single external supply. The buck-boost converter features various

operating modes that can be used to enhance power dissipation and thermal performance. The DAC8771

features additional peripherals including: HART input pins for coupling of FSK HART voltage signals, slew-

rate control for the analog output, and reliability features such as CRC, watchdog timer, and conditional

alarms.

1.1 EVM Kit Contents

Table 1 details the contents of the EVM kit. Contact the nearest Texas Instruments Product Information

Center or visit the Texas Instruments E2E Community (http://E2E.ti.com) if any component is missing.

Table 1. Contents of DAC8771EVM Kit

Item # Item QTY Description or Use

1 DAC8771EVM PCB 1 EVM hardware

2 USB Extension Cable 1 Connects PC USB port to SM-USB-DIG USB connector

3 SM-USB-DIG Platform 1 Platform used for digital communication from PC to EVM

1.2 Related Documentation From Texas Instruments

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

assembly of the DAC8771EVM. This user’s guide is available from the TI website under the literature

number SLAU727. 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 website

at http://www.ti.com/, or by calling the Texas Instruments Literature Response Center at 1-800-477-8924

or the Product Information Center at 1-972-644-5580. When ordering identify the document by both title

and literature number.

Table 2. Related Documentation

Item # Literature Number

DAC8771 product data sheet SLASEE2

REF5050 product data sheet SBOS410

SM-USB-DIG platform user’s guide SBOU098

DAC8771

PVDD/AVDD

Power Supply

VOUT

IOUT

HARTIN

IEC61000-4 Protection Circuit

Placeholder

External Supplies

SM-USB-DIG

VPOS/VNEG

Internal Buck-Boost

External VREF

REF5050

Internal VREF

VREF

SPI

Computer SM-USB-DIG

Platform DAC8771EVM

Power Supply

USB 10-Pin Connector

Single-supply for use with buck-boost converter

Multi-supply for use without buck-boost converter

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EVM Hardware Overview

SLAU727–August 2017

DAC8771 Evaluation Module

2 EVM Hardware Overview

This section discusses the overall system setup for the EVM. A personal computer (PC) runs the software

that communicates with the SM-USB-DIG platform, which provides the power and digital signals used to

communicate with the EVM board. Connectors on the EVM board allow the user to connect the required

external power supplies for the configuration under test. The SM-USB-DIG must be connected to the

DAC8771EVM with the Texas Instruments logo facing up.

Figure 1. DAC8771EVM Hardware Setup

2.1 EVM Board Block Diagram

A block diagram of the EVM board setup is shown in Figure 2. This board provides test points for the SPI,

power, reference, ground, analog outputs, LDAC, CLR, ALARM, and RESET signals. The EVM allows the

user to select the internal buck-boost converter or external power supplies as sources for positive and

negative supply rails of each channel. The EVM also allows the user to select the internal reference,

onboard REF5050 reference, or external reference to provide the reference voltage to the DAC8771.

Figure 2. DAC8771EVM Block Diagram

EVM Hardware Overview

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2.2 Electrostatic Discharge Warning

Many of the components on the EVM are susceptible to damage by electrostatic discharge (ESD). Users

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.

2.3 Jumper Summary

Table 3 summarizes all of the EVM jumper functionality.

Table 3. EVM Jumper Summary

Jumper Label Default Position Function

JP1 1-2 1-2 Selects positive buck-boost to supply VPOS

2-3 Selects PVDD/AVDD to supply VPOS

JP2 1-2 1-2 Selects negative buck-boost to supply VNEG

2-3 Selects EXT_VNEG to supply VNEG

JP3 Installed Installed VSENSEP is shorted to VOUT onboard

Not installed VSENSEP is shorted to VOUT off board

JP4 Installed Installed Loads VOUT/IOUT with a short to GND

Not installed Unloads VOUT/IOUT of the short to GND

JP5 Installed Installed Loads VOUT/IOUT with a 249-Ωresistor

Not installed Unloads VOUT/IOUT of the 249-Ωresistor

JP6 Not installed Installed Loads VOUT/IOUT with a 624-Ωresistor

Not installed Unloads VOUT/IOUT of the 625-Ωresistor

JP7 Not installed Installed Loads VOUT/IOUT with a 1-kΩresistor

Not installed Unloads VOUT/IOUT of the 1-kΩresistor

JP8 Installed Installed VSENSEN is shorted to GND onboard

Not installed VSENSEN is shorted to GND off board

JP9 Installed Installed When HART_IN is not in use, AC couple to GND

Not installed When HART_IN is in use, disconnect from GND

JP10 Not installed Installed Selects the external DVDD

Not installed Disconnects the external DVDD

JP11 1-2 1-2 Selects the DAC8771 internal reference

2-3 Selects the REF5050 external reference

JP12 2-3 1-2 Issues a clear command to the DAC8771

2-3 No operation

JP13 Not installed Installed Issues a hardware reset to the DAC8771

Not installed No operation

JP14 Installed Installed Select asynchronous update mode

Not installed Select asynchronous update mode

JP15 Not installed Installed Disables internal DVDD LDO

Not installed Enables internal DVDD LDO

JP16 Not installed Installed Connects the SM-USB-DIG supply to DVDD

Not installed Disconnects SM-USB-DIG supply for DVDD

JP17 Not installed Installed RSET is connected to external Resistor

Not installed Internal current setting resistor is used

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EVM Hardware Overview

SLAU727–August 2017

DAC8771 Evaluation Module

2.4 Powering the EVM

This section describes the various power configurations that can be used by the EVM.

2.4.1 PVDD/AVDD Supply

The PVDD, the buck-boost converter supply, and AVDD, the analog supply, of the DAC8771 are

connected to the same power net labeled PVDD/AVDD on the DAC8771EVM. Terminal block J3, shown

in Figure 3, allows for external voltage sources to be connected to the PVDD/AVDD supply. The

PVDD/AVDD supply must be provided regardless of whether the buck-boost converter is in use or not.

Figure 3. PVDD/AVDD, and DVDD Supply Connections

2.4.2 VPOS and VNEG Supplies

VPOS, the positive supply for the output signal chain, and VNEG, the negative supply for the output signal

chain, may be powered by the DAC8771 internal buck-boost converters or by off-board supply voltages.

WARNING

Permanent device damage may occur if externally supplying VPOS

or VNEG while the internal buck-boost supply is enabled.

When using the DAC8771 internal buck-boost converters to supply VPOS and VNEG, install JP1 and JP2

in the 1-2 position, or "inside" position, as indicated by Table 3.

When using external equipment to supply VPOS and VNEG, install JP1 and JP2 in the 2-3 position, or

"outside" position, as indicated by Table 3. In this configuration, the VPOS supply is connected to the

PVDD/AVDD net and the VNEG supply is connected to the EXT_VNEG. If bipolar supplies are used,

connect an appropriate negative supply voltage to AVSS through terminal block J4, as shown in Figure 3.

If unipolar supplies are used, connect AVSS to ground through terminal block J3.

EVM Hardware Overview

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2.4.3 DVDD Supply

DVDD, the digital supply voltage, of the DAC8771 can be supplied by the SM-USB-DIG VDUT supply (pin

6 of J1), an external supply voltage through J5 (illustrated in Figure 3), or by the DAC8771 internal DVDD

LDO. When using the SM-USB-DIG as the DVDD supply, uninstall jumper JP10 and install jumpers JP15

and JP15. To use an external supply voltage as the DVDD supply, install jumpers JP10 and JP15 and

uninstall JP16. To use the DAC8771 internal LDO as the DVDD supply, uninstall jumpers JP10, JP15, and

JP16.

In each DVDD supply configuration, take care to ensure that digital logic thresholds of the host and

DAC8771 match and that the absolute maximum ratings of the DAC8771 are not violated.

2.5 EVM Features

This section describes some of the hardware features present on the EVM board.

2.5.1 Communication Test Points

The EVM board features test points for monitoring the communication between the SM-USB-DIG and the

DAC8771. Header J2 provide test points for the LDAC, ALARM, CLR, RESET, SDIN, SCLK, SYNC, and

SDO pins of the DAC8771.

Figure 4. Digital Communication Test Points

The EVM design also allows external signals to be connected through these communication test points if

the EVM is integrated into a custom evaluation setup or application-specific prototype. Note that if the SM-

USB-DIG platform is not used, DVDD must be configured to use the DAC8771 internal DVDD LDO or

external supplies as described in Section 2.4.3.

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EVM Hardware Overview

SLAU727–August 2017

DAC8771 Evaluation Module

2.5.2 Reference Voltage

The DAC8771 reference voltage can be supplied by the internal voltage reference, by the onboard

REF5050, or by an external reference voltage.

Figure 5. Onboard Reference Supply Connections

To use the internal reference voltage, place JP11 in the 1-2 position. To use the REF5050 reference

voltage, place JP11 in the 2-3 position and connect a supply voltage for the REF5050 to J6, as shown in

Figure 5. To use an external reference voltage, remove JP11 and the reference can be connected to the

DAC8771EVM through the center post of JP11.

2.5.3 VOUT, VSENSEP, and VSENSEN

The VOUT pins can be accessed on terminal block J7, by the OUT test points. The VSENSEP and

VSENSEN sense connections may be provided onboard or externally closer to the point of load through

terminal block J7. To provide the VSENSEP connections onboard, install JP3. Similarly, to provide the

VSENSEN connections onboard, install JP8. Removing these jumpers requires that the sense connections

are made external to the EVM board. Figure 6 shows the arrangement of the output terminal blocks.

2.5.4 IOUT

The IOUT pin can be accessed on terminal block J7 or by the test point OUT.

2.5.5 Onboard Output Loads

Four load choices are installed on the EVM board to evaluate the voltage and current outputs as well as

the adaptive power management performance of the DAC8771. JP4 is available to provide a short-circuit

condition on the output. JP5 provides a 250-Ωload on the output. JP6 provides a 625-Ωon the output.

JP7 provides a 1-kΩload on the output.

Figure 6. Output Terminal Block Connections and Load Jumpers

EVM Hardware Overview

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2.5.6 Applying HART Signals

JP9 is available to couple external HART FSK communication signals onto the current outputs. When

injecting the HART signal, remove JP9 and apply the HART signal to JP9 pin 1. When a HART signal is

not being injected, install JP9 with AC coupling the HART pins to ground.

2.6 Connecting the SM-USB-DIG

To connect the EVM board and the SM-USB-DIG platform together, firmly slide the male and female ends

of the 10-pin connectors together with the Texas Instruments logo of the SM-USB-DIG facing up as shown

in Figure 7. Make sure that the two connectors are completely pushed together as loose connections may

cause intermittent operation.

Figure 7. SM-USB-DIG Connection

2.7 Signal Definitions of J1 (10-Pin SM-USB-DIG Connector)

Table 4 shows the pin-out for the 10-pin connector used to communicate between the EVM and the SM-

USB-DIG. Note that the I2C communication lines (I2C_SCL and I2C_SDA1) are not used.

Table 4. SM-USB-DIG Connector

Pin on J1 Signal Description

1 I2C_SCL I2C clock signal (SCL)

2 CTRL/MEAS4 GPIO: Control output or measure input

3 I2C_SDA1 I2C data signal (SDA)

4 CTRL/MEAS5 GPIO: Control output or measure input

5 SPI_DOUT1 SPI data output (MOSI)

6 VDUT Switchable DUT power supply: 3.3 V, 5 V, Hi-Z

(disconnected).

Note: When VDUT is Hi-Z, all digital I/Os are Hi-Z as well

7 SPI_CLK SPI clock signal (SCLK)

8 GND Power return (GND)

9 SPI_CS1 SPI chip-select signal (!CS)

10 SPI_DIN1 SPI data input (MISO)

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EVM Software Setup

SLAU727–August 2017

DAC8771 Evaluation Module

3 EVM Software Setup

This section discusses how to install the EVM software.

3.1 Operating Systems for EVM Software

The EVM software has been tested on the Microsoft®Windows®XP and Windows 7 operating systems

with United States and European regional settings. The software should also function on other Windows

operating systems.

3.2 EVM Software Installation

Download the EVM software by following the instructions provided external to this document. To install the

software, locate and extract the file named DAC8771.zip to a specific folder (for example, C:\DAC8771\)

on the hard drive.

Figure 8. DAC8771EVM Installer

After the files are extracted, navigate to the folder created on the hard drive. Locate and execute the

setup.exe file to start the installation. The DAC8771 software installer file then opens to begin the

installation process.

After the installation process initializes, the user is given a choice of selecting the installation directory,

usually defaulting to C:\Program Files(x86)\DAC8771EVM\ and C:\Program Files(x86)\National

Instruments\.

EVM Software Setup

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Figure 9. DAC8771EVM Install Path

After selecting the installation directory, two license agreements are presented that must be accepted.

Figure 10. DAC8771EVM Software License Agreements

After accepting the Texas Instruments and National Instruments license agreements, the progress bar

opens and shows the installation of the software. Once the installation process is completed, click Finish.

Indice

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