Texas Instruments ADS1015EVM Manuale utente

User's Guide

SBAU157B–August 2009–Revised May 2011

ADS1015EVM, ADS1115EVM, ADS1015EVM-PDK, and

ADS1115EVM-PDK

ADS1115EVM (Left) and ADS1115EVM-PDK (Right)

This user's guide describes the characteristics, operation, and use of the ADS1015EVM and

ADS1115EVM, both by themselves and as part of the ADS1015EVM-PDK or ADS1115EVM-PDK. These

evaluation modules (EVMs) are evaluation boards for the ADS1115, a 16-bit multi-channel, delta-sigma

analog-to-digital converter (ADC), and the ADS1015, a 12-bit version of the ADS1115. The EVM allows

evaluation of all aspects of the ADS1015 or ADS1115 device. Complete circuit descriptions, schematic

diagrams, and bills of material are included in this document.

The following related documents are available through the Texas Instruments web site at

http://www.ti.com.

EVM-Compatible Device Data Sheets

Device Literature Number

ADS1015 SBAS473

ADS1115 SBAS444

SN74LVC2G125 SCES204M

PCA9306 SCPS113I

ADCPro is a trademark of Texas Instruments.

Microsoft, Windows are registered trademarks of Microsoft Corporation.

I2C is a trademark of NXP Semiconductors.

All other trademarks are the property of their respective owners.

SBAU157B–August 2009–Revised May 2011 ADS1015EVM, ADS1115EVM, ADS1015EVM-PDK, and ADS1115EVM-PDK

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Contents

1 EVM Overview ............................................................................................................... 3

2 Analog Interface ............................................................................................................. 3

3 Digital Interface .............................................................................................................. 4

4 Power Supplies .............................................................................................................. 5

5 EVM Operation .............................................................................................................. 5

6 ADS1115EVM-PDK Kit Operation ........................................................................................ 6

7 Evaluating Performance with the ADCPro Software .................................................................. 15

8 Schematics and Layout ................................................................................................... 21

List of Figures

1 ADS1115EVM Default Jumper Locations................................................................................ 6

2 Virtual COM Port Installer.................................................................................................. 7

3 Virtual COM Port Setup.................................................................................................... 7

4 MMB3 Switch Locations.................................................................................................... 8

5 Connecting ADS1115EVM to MMB3..................................................................................... 9

6 MMB3 Block Diagram..................................................................................................... 10

7 ADCPro Software Start-up Display Window ........................................................................... 11

8 ADS1115EVM-PDK Plug-In Display Window.......................................................................... 12

9 Connection Timeout....................................................................................................... 13

10 Firmware Download Message Box...................................................................................... 13

11 Firmware Download Progress Indicator ................................................................................ 14

12 Firmware Download Complete Message Box ......................................................................... 15

13 Device 1 Tab............................................................................................................... 17

14 About Tab .................................................................................................................. 19

15 Progress Bar While Collecting Data .................................................................................... 20

List of Tables

1 J1: Analog Interface Pinout................................................................................................ 4

2 J3: Serial Interface Pins.................................................................................................... 4

3 J2 Configuration: Power-Supply Input.................................................................................... 5

4 JMP1 Configuration: Power Options ..................................................................................... 5

5 List of Switches.............................................................................................................. 6

6 ADS1015EVM/ADS1115EVM Bill of Materials ....................................................................... 22

2ADS1015EVM, ADS1115EVM, ADS1015EVM-PDK, and ADS1115EVM-PDK SBAU157B–August 2009–Revised May 2011

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EVM Overview

1 EVM Overview

1.1 Features

ADS1015EVM/ADS1115EVM Features:

•Contains all support circuitry needed for the ADS1015/ADS1115

•Two ADS1015/ADS1115 devices onboard to demonstrate I2C™bus functionality

•+3.3, +5V, or external power supply options for ADC

•Compatible with the TI Modular EVM System

ADS1015EVM-PDK/ADS1115EVM-PDK Features:

•Easy-to-use evaluation software for Microsoft®Windows®XP

•Data collection to text files

•Built-in analysis tools including scope, FFT, and histogram displays

•Complete control of board settings

•Easily expandable with new analysis plug-in tools from Texas Instruments

For use with a computer, the ADS1015EVM-PDK or ADS1115EVM-PDK is available. This kit combines

the ADS1015/ADS1115EVM board with the MSP430-based MMB3 motherboard, and includes ADCPro™

software for evaluation.

The MMB3 motherboard allows the ADS1015/ADS1115EVM to be connected to the computer via an

available USB port. This manual shows how to use the MMB3 as part of the

ADS1015EVM-PDK/ADS1115EVM-PDK, but does not provide technical details about the MMB3 itself.

ADCPro is a program for collecting, recording, and analyzing data from ADC evaluation boards. It is based

on a number of plug-in programs, so it can be expanded easily with new test and data collection plug-ins.

The ADS1015EVM-PDK/ADS1115EVM-PDK is controlled by a plug-in running in ADCPro. For more

information about ADCPro, see the ADCPro™Analog-to-Digital Converter Evalutation Software User's

Guide (literature number SBAU128), available for download from the TI web site.

This manual covers the operation of both the ADS1015/ADS1115EVM and the

ADS1015EVM-PDK/ADS1115EVM-PDK. Throughout this document, the abbreviation EVM and the term

evaluation module are synonymous with the ADS1015/ADS1115EVM. For clarity of reading, the rest of

this manual will refer only to the ADS1115EVM or ADS1115EVM-PDK, but operation of the EVM and kit

for the ADS1015 is identical, unless otherwise noted.

1.2 Introduction

The ADS1115EVM is an evaluation module built to the TI Modular EVM System specification. It can be

connected to any modular EVM system interface card.

The ADS1115EVM is available as a stand-alone printed circuit board (PCB) or as part of the

ADS1115EVM-PDK, which includes an MMB3 motherboard and software. As a stand-alone PCB, the

ADS1115EVM is useful for prototyping designs and firmware.

Note that the ADS1115EVM has no microprocessor and cannot run software. To connect it to a computer,

some type of interface is required.

2 Analog Interface

For maximum flexibility, the ADS1115EVM is designed for easy interfacing to multiple analog sources.

Samtec part numbers SSW-110-22-F-D-VS-K and TSM-110-01-T-DV-P provide a convenient 10-pin,

dual-row, header/socket combination at J1. This header/socket provides access to the analog input pins of

the ADS1115. Consult Samtec at http://www.samtec.com or call 1-800-SAMTEC-9 for a variety of mating

connector options.

SBAU157B–August 2009–Revised May 2011 ADS1015EVM, ADS1115EVM, ADS1015EVM-PDK, and ADS1115EVM-PDK

Digital Interface

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All of the pins on J1 are connected directly to the ADS1115 device input pins, with no protection. Use

appropriate caution when handling these pins. Table 1 summarizes the pinouts for the analog interface J1.

Table 1. J1: Analog Interface Pinout

Description,

Pin Number Signal ADS1015/ADS1115

J1.2 A0(+) AIN0, Device 1 (U1)

J1.4 A1(+) AIN1, Device 1 (U1)

J1.6 A2(+) AIN2, Device 1 (U1)

J1.8 A3(+) AIN3, Device 1 (U1)

J1.10 A0(+) AIN0, Device 2 (U2)

J1.12 A1(+) AIN1, Device 2 (U2)

J1.14 A2(+) AIN2, Device 2 (U2)

J1.16 A3(+) AIN3, Device 2 (U2)

J1.1-7 (odd) Unused

J1.15 Unused

J1.9-19 (odd) AGND Analog ground connections

(except J1.15)

J1.18, J1.20 Unused

3 Digital Interface

3.1 Serial Data Interface

The ADS1115EVM is designed to easily interface with multiple control platforms. Samtec part numbers

SSW-110-22-F-D-VS-K and TSM-110-01-T-DV-P provide a convenient 10-pin, dual-row, header/socket

combination at J3. This header/socket provides access to the digital control and serial data pins of the

ADC. Consult Samtec at http://www.samtec.com or call 1-800-SAMTEC-9 for a variety of mating

connector options.

All logic levels on J3 are 3.3V CMOS, except for the I2C pins. These pins conform to 3.3V I2C rules.

Table 2 describes the J3 serial interface pins.

Table 2. J3: Serial Interface Pins

Pin No. Pin Name Signal Name I/O Type Pullup Function

J3.1-19 (odd) —Unused —None

J3.2 GPIO0 ALERT/RDY Out None Digital comparator

(U1) output or conversion

ready for Device 1 (U1)

J3.4 DGND DGND In/Out None Digital ground

J3.6 GPIO1 ALERT/RDY Out None Digital comparator

(U2) output or conversion

ready for Device 2 (U2)

J3.8 GPIO2 Unused —None

J3.10 DGND DGND In/Out None Digital ground

J3.12 GPIO3 Unused —None

J3.14 GPIO4 Unused —None

J3.16 SCL SCL I2C High I2C clock

J3.18 DGND DGND In/Out None Digital ground

J3.20 SDA SDA I2C High I2C data

4ADS1015EVM, ADS1115EVM, ADS1015EVM-PDK, and ADS1115EVM-PDK SBAU157B–August 2009–Revised May 2011

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Power Supplies

4 Power Supplies

J2 is the power-supply input connector. Table 3 lists the configuration details for J2.

Table 3. J2 Configuration: Power-Supply Input

Pin No. Pin Name Function Required

J2.1 +VA External analog supply If 3.3 or 5V supplies not

used

J2.2 –VA Unused No

J2.3 +5VA Unused No

J2.4 –5VA Unused No

J2.5 DGND Digital ground input Yes

J2.6 AGND Analog ground input Yes

J2.7 +1.8VD Unused No

J2.8 VD1 Unused No

J2.9 +3.3VD 3.3V digital supply If 5V or external supplies

not used

J2.10 +5VD +5V digital supply If 3.3V or external

supplies not used

4.1 Power Options

JMP1 is arranged as four rows, each of which can be shorted. Table 4 lists the power option details for

JMP1. For normal operation, all jumpers should be installed.

Table 4. JMP1 Configuration: Power Options

Row Name Function

1-2 VDD1 Supply current measurement

point for Device 1. Must be

connected for operation.

3-4 VDD2 Supply current measurement

point for Device 2. Must be

connected for operation.

5-6 VDD Supply current measurement

point for the other digital devices.

Must be connected for operation.

7-8 GND Connects DGND to AGND.

Switch S1 selects the supply voltage used to feed JMP1 and the respective VDDs shown in Table 4. S1

may be switched to +VA, +5VD, or +3.3VD from power connector J2.

5 EVM Operation

This section provides information on the analog input, digital control, and general operating conditions of

the ADS1115EVM.

5.1 Analog Input

Each of the analog input sources can be applied directly to J1 (top or bottom side) or through

signal-conditioning modules available for the the modular EVM system.

5.2 Digital Control

The digital control signals can be applied directly to J3 (top or bottom side). The modular ADS1115EVM

can also be connected directly to a DSP or microcontroller interface board, such as the 5-6K Interface or

HPA-MCU Interface boards available from Texas Instruments, or the MMB3 if purchased as part of the

ADS1115EVM-PDK. For a list of compatible interface and/or accessory boards for the EVM or the

ADS1115, see the relevant product folder on the TI web site.

SBAU157B–August 2009–Revised May 2011 ADS1015EVM, ADS1115EVM, ADS1015EVM-PDK, and ADS1115EVM-PDK

ADS1115EVM-PDK Kit Operation

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5.3 Default Jumper Settings and Switch Positions

Figure 1 shows the jumpers found on the EVM and the respective factory default conditions for each.

Figure 1. ADS1115EVM Default Jumper Locations

Table 5 lists the switches found on the EVM and the respective factory default conditions for each.

Table 5. List of Switches

Switch Position Switch Description

S1 Right (default) VDD = +3.3VD

Center VDD = +5VD

Left VDD = +VA

6 ADS1115EVM-PDK Kit Operation

This section provides information on using the ADS1115EVM-PDK, including setup, program installation,

and program usage.

To prepare to evaluate the ADS1115 with the ADS1115EVM-PDK, complete the following steps:

Step 1. Install the ADCPro software (if not already installed) on a PC.

Step 2. Install the ADS1115EVM-PDK EVM plug-in software.

Step 3. Complete the USB driver installation process.

Step 4. Set up the ADS1115EVM-PDK.

Step 5. Connect the ADS1115EVM-PDK to the computer with a USB cable.

Step 6. Run the ADCPro software.

Each task is described in the subsequent sections of this document.

6ADS1015EVM, ADS1115EVM, ADS1015EVM-PDK, and ADS1115EVM-PDK SBAU157B–August 2009–Revised May 2011

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ADS1115EVM-PDK Kit Operation

6.1 Installing the ADCPro Software

CAUTION

Do not connect the ADS1115EVM-PDK before installing the software on a

suitable PC. Failure to observe this caution may cause Microsoft Windows to

not recognize the ADS1115EVM-PDK as a connected device.

The latest software is available from the TI website at http://www.ti.com. Refer to the ADCPro User Guide

for instructions on installing and using ADCPro.

To install the ADS1115EVM-PDK plug-in, run the file: ads1115evm-pdk-plug-in-1.0.0.exe (1.0.0 is the

version number, and increments with software version releases). Double-click the file to run it; then follow

the instructions shown. You can also use the ADCPro Update Check feature to check for newer versions

of the ADS1115EVM-PDK plug-in, once you have installed a version of it.

Follow the on-screen prompts. Once the ADCPro plug-in installs, you will be prompted to install the Virtual

COM port driver as shown in Figure 2.

Figure 2. Virtual COM Port Installer

Press OK, and the screen shown in Figure 3 displays.

Figure 3. Virtual COM Port Setup

If you already have a TUSB3410 Virtual COM port driver installed on your system, select Cancel;

otherwise, press Setup and follow the on-screen prompts. You may be notified that the driver is not

digitally signed. If this occurs, select Continue Anyway and proceed.

SBAU157B–August 2009–Revised May 2011 ADS1015EVM, ADS1115EVM, ADS1015EVM-PDK, and ADS1115EVM-PDK

ADS1115EVM-PDK Kit Operation

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6.2 Setting Up the ADS1115EVM-PDK

The ADS1115EVM-PDK contains both the ADS1115EVM and the MMB3 motherboard; however, the

devices are shipped unconnected. Follow these steps to set up the ADS1115EVM-PDK.

Step 1. Unpack the ADS1115EVM-PDK kit.

Step 2. Set the switches on the MMB3 as described below, as Figure 4 illustrates.

•Set switch SW4 to the right.

•Set the DAC switch (SW5) to the OUT position (to the right).

Figure 4. MMB3 Switch Locations

8ADS1015EVM, ADS1115EVM, ADS1015EVM-PDK, and ADS1115EVM-PDK SBAU157B–August 2009–Revised May 2011

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ADS1115EVM-PDK Kit Operation

space

Step 3. Plug the ADS1115EVM into the MMB3 as Figure 5 illustrates.

Figure 5. Connecting ADS1115EVM to MMB3

Step 4. Set the jumpers and switches on the ADS1115EVM as shown in Figure 1 (note that these

settings are the factory-configured settings for the EVM).

SBAU157B–August 2009–Revised May 2011 ADS1015EVM, ADS1115EVM, ADS1015EVM-PDK, and ADS1115EVM-PDK

+5VA

-5VA

+5VD

+3.3V

+1.8V

+10V

-10V

PWR & VREF

USB

RESET

DAC1220

TUSB3410

MSP430F449

-1

DAC

IN OUT

Analog

Daughtercard

Modular

Connectors

Power

Power from

PWR & VREF Block

Serial

Joystick

RESET

OPER

LCD DISPLAY

BSL

2.5V

Supplied to

Daughtercard

Power Connector

ADS1115EVM-PDK Kit Operation

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6.2.1 About the MMB3

The MMB3 is a Modular EVM System motherboard. It is designed around the MSP430F449, a low-power

microcontroller from Texas Instruments. Figure 6 shows a block diagram of the MMB3.

Figure 6. MMB3 Block Diagram

The MMB3 was designed to be used as a stand-alone demonstration platform for low-speed data

converters. It features an onboard, 20-bit digital-to-analog converter (DAC) that can be used as a signal

source for an ADC under test, and has a joystick for control of functions on the board when it is not

controlled by a PC. These features are experimental and not supported in the ADS1115EVM-PDK at

this time.

The MMB3 derives power from the USB interface, and generates +5VD, 3.3V, and 1.8V, as well as +5VA

and –5VA and ±10V. The ±10V is supplied to the daughtercard power connector as +VA and –VA.

CAUTION

When using the ADS1115EVM connected to the MMB3, do not move switch S1

to the +VA position. This switch position will apply +10V to the devices on the

EVM and damage the EVM.

The MMB3 is not sold as a microcontroller development board, and it is not available separately. TI cannot

offer support for the MMB3 except as part of an EVM kit. For schematics or other information about the

MMB3, contact Texas Instruments.

10 ADS1015EVM, ADS1115EVM, ADS1015EVM-PDK, and ADS1115EVM-PDK SBAU157B–August 2009–Revised May 2011

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