Texas Instruments DAC8775EVM Manuale utente

SBAU248–November 2016

DAC8775EVM User’s Guide

User's Guide

SBAU248–November 2016

DAC8775EVM User’s Guide

This user’s guide describes the characteristics and use of the DAC8775 evaluation board (EVM). It also

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

document, the terms DAC8775EVM, evaluation board, evaluation module, and EVM are synonymous with

the DAC8775EVM.

Contents

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

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

3 EVM Software Setup....................................................................................................... 10

4 EVM Software Overview .................................................................................................. 12

5 EVM Documentation....................................................................................................... 15

List of Figures

1 DAC8775EVM Hardware Setup ........................................................................................... 3

2 DAC8775EVM Block Diagram ............................................................................................. 3

3 PVDD/AVDD, AVSS, and DVDD Supply Connections ................................................................. 6

4 Digital Communication Test Points........................................................................................ 7

5 Onboard Reference Supply Connections................................................................................. 8

6 Output Terminal Block Connections and Load Jumpers ............................................................... 9

7 SM-USB-DIG Connection................................................................................................... 9

8 DAC8775EVM Installer.................................................................................................... 10

9 DAC8775EVM Install Path................................................................................................ 11

10 DAC8775EVM Software License Agreements ......................................................................... 11

11 EVM GUI – Front Panel ................................................................................................... 12

12 Device Schematic.......................................................................................................... 15

13 DC-DC Schematic.......................................................................................................... 16

14 Outputs Schematic......................................................................................................... 16

15 DAC8775EVM PCB Components Layout............................................................................... 17

List of Tables

1 Contents of DAC8775EVM Kit............................................................................................. 2

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

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

4 SM-USB-DIG Connector .................................................................................................. 10

5 EVM Board Bill of Materials............................................................................................... 18

Overview

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Trademarks

Windows XP, Windows 7 are registered trademarks of Microsoft.

1 Overview

The DAC8775 is a four-channel (quad) 16-bit precision digital-to-analog converter (DAC). Each 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.

Each channel 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 DAC8775 includes integrated buck-boost converters for each channel

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

DAC8775 features additional peripherals including: HART input pins for coupling of FSK HART Voltage

signals, slew-rate control for the analog outputs, 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 DAC8775EVM Kit

ITEM NO ITEM QTY DESCRIPTION OR USE

1 DAC8775EVM 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 DAC8775EVM. This user’s guide is available from the TI website under the literature

number SBAU248. 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 NO LITERATURE NUMBER

DAC8775 product data sheet SLVSBY7

REF5050 product data sheet SBOS410

SM-USB-DIG platform user’s guide SBOU098

DAC8775

PVDD/AVDD

Power Supply

VOUTA

IOUTA

VOUTD

IOUTD

...

HARTINX

IEC61000-4 Protection Circuit

Placeholder

External Supplies

SM-USB-DIG

VPOSX/VNEGX

Internal Buck-Boost

External VREF

REF5050

Internal VREF

VREF

SPI

Computer SM-USB-DIG

Platform DAC8775EVM

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

SBAU248–November 2016

DAC8775EVM User’s Guide

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

DAC8775EVM with the Texas Instruments logo facing up.

Figure 1. DAC8775EVM 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 each channel’s

positive and negative supplies rails. The EVM also allows the user to select the internal reference,

onboard REF5050 reference, or external reference to provide the reference voltage to the DAC8775.

Figure 2. DAC8775EVM 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 DC/DC Channel A to supply VPOSA

2-3 Selects PVDD/AVDD to supply VPOSA

JP2 1-2 1-2 Selects DC/DC Channel A to supply VNEGA

2-3 Selects AVSS to supply VNEGA

JP3 1-2 1-2 Selects DC/DC Channel B to supply VPOSB

2-3 Selects PVDD/AVDD to supply VPOSB

JP4 1-2 1-2 Selects DC/DC Channel B to supply VNEGB

2-3 Selects AVSS to supply VNEGB

JP5 1-2 1-2 Selects DC/DC Channel C to supply VPOSC

2-3 Selects PVDD/AVDD to supply VPOSC

JP6 1-2 1-2 Selects DC/DC Channel C to supply VNEGC

2-3 Selects AVSS to supply VNEGC

JP7 1-2 1-2 Selects DC/DC Channel D to supply VPOSD

2-3 Selects PVDD/AVDD to supply VPOSD

JP8 1-2 1-2 Selects DC/DC Channel D to supply VNEGD

2-3 Selects AVSS to supply VNEGD

JP9 Not installed Installed Connects the SM-USB-DIG supply to DVDD

Not installed Disconnects the SM-USB-DIG supply from DVDD

JP10 1-2 1-2 Selects the DAC8775 internal reference

2-3 Selects the REF5050 external reference

JP11 Not installed Installed Disables internal DVDD LDO

Not installed Enables internal DVDD LDO

JP12 2-3 1-2 Issues a clear command to the DAC8775

2-3 No operation

JP13 Not installed Installed Selects the external DVDD

Not installed Disconnects the external DVDD

JP14 Not installed Installed Issues a hardware reset to the DAC8775

Not installed No operation

JP15 Installed Installed Select asynchronous update mode

Not installed Select synchronous update mode

JP16 Installed Installed VSENSEPA is shorted to VOUTA on-board

Not installed VSENSEPA is shorted to VOUTA off-board

JP17 Installed Installed VSENSEPB is shorted to VOUTB onboard

Not installed VSENSEPB is shorted to VOUTB off-board

JP18 Not installed Installed Loads VOUTA/IOUTA with a short to GND

Not installed Unloads VOUTA/IOUTA of the short to GND

JP19 Installed Installed Loads VOUTA/IOUTA with a 250-Ωresistor

Not installed Unloads VOUTA/IOUTA of the 250-Ωresistor

JP20 Not installed Installed Loads VOUTA/IOUTA with a 625-Ωresistor

Not installed Unloads VOUTA/IOUTA of the 625-Ωresistor

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DAC8775EVM User’s Guide

Table 3. EVM Jumper Summary (continued)

JUMPER LABEL DEFAULT POSITION FUNCTION

JP21 Not installed Installed Loads VOUTA/IOUTA with a 1-kΩresistor

Not installed Unloads VOUTA/IOUTA the 1-kΩresistor

JP22 Not installed Installed Loads VOUTB/IOUTB with a short to GND

Not installed Unloads VOUTB/IOUTB of the short to GND

JP23 Not installed Installed Loads VOUTB/IOUTB with a 250-Ωresistor

Not installed Unloads VOUTB/IOUTB of the 250-Ωresistor

JP24 Not installed Installed Loads VOUTB/IOUTB with a 625-Ωresistor

Not installed Unloads VOUTB/IOUTB of the 625-Ωresistor

JP25 Not installed Installed Loads VOUTB/IOUTB with a 1-kΩresistor

Not installed Unloads VOUTB/IOUTB the 1-kΩresistor

JP26 Installed Installed VSENSENA is shorted to GND onboard

Not installed VSENSENA is shorted to GND off-board

JP27 Installed Installed VSENSENB is shorted to GND onboard

Not installed VSENSENB is shorted to GND off-board

JP28 Installed Installed When HARTIN_A is not in use, AC couple to GND

Not installed When HARTIN_A is in use, disconnect from GND

JP29 Installed Installed When HARTIN_B is not in use, AC couple to GND

Not installed When HARTIN_B is in use, disconnect from GND

JP30 Installed Installed VSENSEPC is shorted to VOUTA onboard

Not installed VSENSEPC is shorted to VOUTA off-board

JP31 Installed Installed VSENSEPD is shorted to VOUTB onboard

Not installed VSENSEPD is shorted to VOUTB off-board

JP32 Not installed Installed Loads VOUTC/IOUTC with a short to GND

Not installed Unloads VOUTC/IOUTC of the short to GND

JP33 Not installed Installed Loads VOUTC/IOUTC with a 250-Ωresistor

Not installed Unloads VOUTC/IOUTC of the 250-Ωresistor

JP34 Not installed Installed Loads VOUTC/IOUTC with a 625-Ωresistor

Not installed Unloads VOUTC/IOUTC of the 625-Ωresistor

JP35 Not installed Installed Loads VOUTC/IOUTC with a 1-kΩresistor

Not installed Unloads VOUTC/IOUTC the 1-kΩresistor

JP36 Not installed Installed Loads VOUTD/IOUTD with a short to GND

Not installed Unloads VOUTD/IOUTD of the short to GND

JP37 Not installed Installed Loads VOUTD/IOUTD with a 250-Ωresistor

Not installed Unloads VOUTD/IOUTD of the 250-Ωresistor

JP38 Not installed Installed Loads VOUTD/IOUTD with a 625-Ωresistor

Not installed Unloads VOUTD/IOUTD of the 625-Ωresistor

JP39 Not installed Installed Loads VOUTD/IOUTD with a 1-kΩresistor

Not installed Unloads VOUTD/IOUTD the 1-kΩresistor

JP40 Installed Installed VSENSENC is shorted to GND onboard

Not installed VSENSENC is shorted to GND off-board

JP41 Installed Installed VSENSEND is shorted to GND onboard

Not installed VSENSEND is shorted to GND off-board

JP42 Installed Installed When HARTIN_C is not in use, AC couple to GND

Not installed When HARTIN_C is in use, disconnect from GND

JP43 Installed Installed When HARTIN_D is not in use, AC couple to GND

Not installed When HARTIN_D is in use, disconnect from GND

PVDD/AVDD

GND

AVSS

GND

DVDD

EVM Hardware Overview

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2.4 Powering the EVM

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

2.4.1 PVDD_X/AVDD Supply

The PVDD_X, the buck-boost converter supplies, and AVDD, the analog supply, of the DAC8775 are

connected to the same power net labeled PVDD/AVDD on the DAC8775EVM. Terminal block J2, 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, AVSS, and DVDD Supply Connections

2.4.2 VPOS_X and VNEG_X Supplies

VPOS_X, the positive supply for the output signal chain, and VNEG_X, the negative supply for the output

signal chain, may be powered by the DAC8775 internal buck-boost converters or by off-board supply

voltages.

WARNING

Permanent device damage may occur if externally supplying

VPOS_X or VNEG_X while the internal buck-boost supply is

enabled.

When using the DAC8775 internal buck-boost converters to supply VPOS_X and VNEG_X, install JP1

through JP8 (or the two jumpers that correspond to the channel of interest) in the 1-2 position, or "inside"

position, as indicated by Table 3.

When using external equipment to supply VPOS_X and VNEG_X, install JP1 through JP8 (or the two

jumpers that correspond to the channel of interest) in the 2-3 position, or "outside" position, as indicated

by Table 3. In this configuration, the VPOS_X supplies are connected to the PVDD/AVDD net and the

VNEG_X supplies are connected to the AVSS net. If bipolar supplies are used, connect an appropriate

negative supply voltage to AVSS through terminal block J3, as shown in Figure 3. If unipolar supplies are

used, connect AVSS to ground through terminal block J3.

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DAC8775EVM User’s Guide

2.4.3 DVDD Supply

DVDD, the digital supply voltage, of the DAC8775 can be supplied by the SM-USB-DIG VDUT supply (pin

6 of J1), an external supply voltage through J4 (illustrated in Figure 3), or by the DAC8775 internal DVDD

LDO. When using the SM-USB-DIG as the DVDD supply, uninstall jumper JP13 and install jumpers JP9

and JP11. To use an external supply voltage as the DVDD supply, install jumpers JP13 and JP11 and

uninstall JP9. To use the DAC8775 internal LDO as the DVDD supply, uninstall jumpers JP9, JP13, and

JP11.

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

DAC8775 match and that the absolute maximum ratings of the DAC8775 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

DAC8775. Test points are provided for the !LDAC, CLR, ALARM, RESET, SDIN, SCLK, !SYNC, and SDO

pins of the DAC8775.

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 DAC8775 internal DVDD LDO or

external supplies as described in Section 2.4.3.

+5V

GND

EVM Hardware Overview

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2.5.2 Reference Voltage

The DAC8775 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 JP10 in the 1-2 position. To use the REF5050 reference

voltage, place JP10 in the 2-3 position and connect a supply voltage for the REF5050 to J9, as shown in

Figure 5. To use an external reference voltage, remove JP10 and the reference can be connected to the

DAC8775EVM through the center post of JP10.

2.5.3 VOUT_X, VSENSEP_X, and VSENSEN_X

The VOUT_X pins can be access on terminal blocks J5, J6, J7, and J8 or by the OUT_A, OUT_B,

OUT_C, or OUT_D test points. The VSENSEP_X and VSENSEN_X sense connections may be provided

onboard or externally closer to the point of load through terminal blocks J5, J6, J7, or J8. To provide the

VSENSEP_X connections onboard, install JP16, JP17, JP30, or JP31 based on the channel of interest.

Similarly, to provide VSENSEN_X connections onboard, install JP26, JP27, JP40, or JP41. 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_X

The IOUT_X pins can be accessed on terminal blocks J5, J6, J7, or J8 or by the test points OUT_A,

OUT_B, OUT_C, or OUT_D.

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 DAC8775. JP18, JP22, JP32, or JP36 are available

to provide a short-circuit condition on the outputs. JP19, JP23, JP33, or JP37 provide a 250-Ωload on the

outputs. JP20, JP24, JP34, or JP38 are available to provide a 625-Ωon the outputs. JP21, JP25, JP35, or

JP39 provides a 1-kΩload on the outputs.

Load

Jumpers

GND

VSENSEN_A

VOUT/IOUT_A

VSENSEP_A

GND

VSENSEN_B

VOUT/IOUT_B

VSENSEP_B

GND

VSENSEN_C

VOUT/IOUT_C

VSENSEP_C

GND

VSENSEN_D

VOUT/IOUT_D

VSENSEP_D

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DAC8775EVM User’s Guide

Figure 6. Output Terminal Block Connections and Load Jumpers

2.5.6 Applying HART Signals

JP28, JP29, JP42, and JP43 are available to couple external HART FSK communication signals onto the

current outputs. When injecting the HART signal, remove JP28, JP29, JP42, or JP43 and apply the HART

signal to pin 1. When a HART signal is not being injected, install JP28, JP29, JP42, or JP43, 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

EVM Hardware Overview

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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)

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 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

The EVM software may be downloaded by following the instructions provided external to this document.

To install the software, locate and extract the file named DAC8775.zip to a specific folder (for example,

C:\DAC8775\) on the hard drive.

Figure 8. DAC8775EVM Installer

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