Texas Instruments ADS1 20EVM Series Manuale utente

User's Guide

SBAU203–July 2013

ADS1x20EVM

This user's guide describes the characteristics, operation, and use of the ADS1x20EVM. These evaluation

modules are an evaluation system for the ADS1220, a 24-bit, low-power, multichannel, delta-sigma (ΔΣ),

analog-to-digital converter (ADC) and the ADS1120, which is the 16-bit version of the ADS1220. The EVM

allows evaluation of all aspects of the ADS1x20 devices.

This document includes an EVM Quick Start, hardware and software details, bill of materials, and

schematic. Table 1 lists the related documents available through the Texas Instruments web site at

www.ti.com.

Table 1. EVM-Compatible Device Data Sheets

Device Literature Number Device Literature Number

ADS1120 SBAS535 MSP430F5528 SLAS590

ADS1220 SBAS501 TPS3838L30 SLVS292

SN74LVC2G157 SCES207 SN74LVC125A SCAS290

TPS76333 SLVS181 — —

MSP430, ADCPro are trademarks of Texas Instruments.

SPI is a trademark of Motorola.

I2C is a trademark of NXP Semiconductors.

Omega is a registered trademark of Omega Engineering Limited.

Samtec is a trademark of Samtec, Inc.

Vishay is a registered trademark of Vishay Intertechnology, Inc.

All other trademarks are the property of their respective owners.

SBAU203–July 2013 ADS1x20EVM

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Contents

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

2 Quick Start ................................................................................................................... 4

3 Quick Reference ............................................................................................................ 5

4 Using the ADS1220EVM ADCPro Plug-in ............................................................................... 6

5 ADS1220EVM Hardware Details ........................................................................................ 10

6 Schematic and Bill of Materials .......................................................................................... 16

List of Figures

1 ADS1x20EVM Default Jumper Locations................................................................................ 4

2 I/O Config .................................................................................................................... 7

3 Current and Ref ............................................................................................................. 8

List of Tables

1 EVM-Compatible Device Data Sheets ................................................................................... 1

2 Default Jumper and Switch Configuration ............................................................................... 4

3 Critical Connections ........................................................................................................ 5

4 Jumper and Switch Descriptions ........................................................................................ 10

5 J4: Primary Analog Interface Pinout .................................................................................... 11

6 J1 and J6: Bridge Sensor Connectors.................................................................................. 11

7 J2: RTD Terminal Block Connector..................................................................................... 12

8 J5: Auxiliary Connector ................................................................................................... 13

9 JTAG Interface Connections............................................................................................. 14

10 JAC: External Interface Connector...................................................................................... 15

11 JDB: External Interface Connector...................................................................................... 15

12 ADS1x20EVM Bill of Materials .......................................................................................... 16

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EVM Overview

1 EVM Overview

The ADS1x20EVM is an evaluation module that includes an MSP430™ microcontroller and software. The

ADS1x20EVM is useful for prototyping designs and firmware as well as for evaluation.

1.1 Features

ADS1x20EVM Features:

• Contains all support circuitry needed for the ADS1120 and ADS1220

• Voltage reference options: internal or external

• Clock options: internal or external

• MSP430 microcontroller with JTAG interface

• Compatible with the TI LaunchPad

The ADS1x20EVM includes an interface for serial communication that can be used with ADCPro™ to

quickly evaluate the device.

This manual covers the operation of the ADS1x20EVM. Throughout this document, the abbreviation EVM

and the term evaluation module are synonymous with the ADS1120EVM and ADS1220EVM. For clarity of

reading, the remainder of this manual refers only to the ADS1220EVM, but operation of the EVM for the

ADS1120 is identical, unless otherwise noted.

SBAU203–July 2013 ADS1x20EVM

Quick Start

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2 Quick Start

This section provides a Quick Start guide to quickly begin evaluating the ADS1220EVM with ADCPro.

2.1 Default Jumper and Switch Configuration

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

Figure 1. ADS1x20EVM Default Jumper Locations

Table 2 lists the primary jumpers and the factory default conditions.

Table 2. Default Jumper and Switch Configuration

Jumper Default Position Description

JP1 Open EXC+ connected to AVDD

JP2 Open EXC- connected to AGND

JP3 Short pins 2-4 AVDD supply connection to +5 V or +3.3 V (default to +3.3 V)

JP7 Short USB power connected to +5 V

JP8 Short U5 output connected to +3.3 V

2.2 ADS1220EVM Operation

To prepare to evaluate the ADS1220 with the ADS1220EVM, complete the following steps:

1. Verify the jumpers on the ADS1220EVM are as shown in Figure 1 (note that these settings are the

factory-configured settings for the EVM).

2. Using ADCPro HW/SW Installation Manual, install the ADCPro and ADS1220EVM plug-in software.

Plug-in software installs the necessary driver for USB communication.

3. Plug the ADS1220EVM into an available USB port. The EVM is configured to power from the USB

port.

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Quick Reference

3 Quick Reference

Table 3 provides a quick summary of the key connections necessary for EVM operation. This information

is helpful when using an external processor, or for monitoring EVM operation.

Table 3. Critical Connections

Function Header (Pin) Pin Name Description

CS JAC.3 (TP1) CS Chip select

SCLK JDB.16 (TP2) SCLK Serial clock

SPI DIN JAC.15 (TP3) DIN Data in

DOUT/DRDY JDB.18 (TP5) DOUT Data out

DRDY JAC.11 (TP4) DRDY Data ready

+3.3 V JAC.1 (TP9) +3.3V Digital or analog supply

Power +5 V JAC.2, J7 (TP8) +5V Analog supply

J1.4, J2.2, J4.2,

Channel 1 AIN0/REFP1 Analog or reference input

J6.4

J1.3, J2.3, J3.2,

Channel 2 AIN1 Analog input

J4.4, J6.3

J1.2, J2.1, J3.1,

Analog inputs Channel 3 AIN2 Analog input

J4.6, J6.2

Channel 4 J1.1, J4.8, J6.1 AIN3/REFN1 Analog or reference input

J2.4, J4.10 REFP0 Reference input (+)

External reference J4.9 REFN0 Reference input (–)

3.1 Analog Inputs

The analog inputs for the ADS1220EVM are connected to J1, J2, J3, J4, and J6. Channels 1 to 4 and the

external reference, connect to header J4.

3.2 Digital Control

The digital control signals can be applied directly to connectors JAC and JDB. The connector footprints

are on the bottom side of the board and the connectors are not installed.

3.3 Power Supply

The ADS1220EVM requires power rails as follows:

• +5-V analog supply: supplied by USB or from an external source connected to J7.

• +3.3-V digital or analog supply: can be supplied from the +5-V supply.

3.4 Voltage Reference

The ADS1220EVM has three options for the reference voltage: an internal reference and two possible

external reference inputs (REF0 and REF1). The ADS1220 internal reference is selected at power up.

Two external reference connections are available as follows:

• REF0 dedicated reference input connected to J2.4 and J4.9-10, and

• REF1 shared with analog inputs connected to J1.1, J1.4, J2.2, J4.2, J4.8, J6.1, and J6.4.

SBAU203–July 2013 ADS1x20EVM

Using the ADS1220EVM ADCPro Plug-in

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4 Using the ADS1220EVM ADCPro Plug-in

The ADS1220EVM plug-in for ADCPro provides complete control over all settings of the ADS1220. The

plug-in consists of a tabbed interface (see Figure 2), with different functions available on different tabs.

The tabs are:

• I/O Config

• Current & Ref

• About

The user can adjust the ADS1220EVM settings when not acquiring data. During acquisition, all controls

are disabled and settings may not be changed. When a setting is changed on the ADS1220EVM plug-in,

the setting immediately updates on the board. Settings on the ADS1220EVM correspond to settings

described in the ADS1220 product data sheet.

4.1 Top-Level Controls

The ADS1220EVM settings can be adjusted when not acquiring data. During acquisition, all controls are

disabled and settings may not be changed.

The effective data rate of the ADS1220 depends upon the frequency of the clock used. The default

operating mode is the internal clock oscillator of the ADS1220, which is 4.096 MHz. The Data Rate

indicator in the upper right corner of the plug-in interface (see Figure 2) is always visible and updates

whenever a setting changes that affects the data rate. The indicated values are representative of the

internal clock frequency of the ADS1220 and the operating clock mode (Normal, Duty-Cycle, or Turbo).

The default operating mode is Normal. The Data Rate is adjusted by making the desired selection from

the drop-down menu.

The Gain indicator in the upper left corner of the plug-in interface (see Figure 2) is always visible and

updates whenever a setting changes that affects the gain. The indicated values are representative of the

state of the PGA Bypass. If PGA Bypass is selected on the I/O Config tab (as shown in Figure 2), only

gains of 1, 2, and 4 are bypassed from the PGA. All other gain settings require the PGA to be enabled.

When higher gains are selected, the PGA is enabled regardless of the PGA Bypass state. To limit

confusion regarding the state of the PGA, the only possible selections for PGA Bypass is 1, 2, or 4 from

the drop-down menu.

The only way to view output data results is by operating the ADS1220 in continuous conversion mode.

This mode is identified by the Cont Conv button indicator (as shown in Figure 2) on the bottom left of the

ADS1220EVM plug-in. The button is lit green when in continuous conversion mode, otherwise the

ADS1220 is in single conversion mode in a power-down state. No data can be collected while not in Cont

Conv and are only useful for monitoring supply currents to determine power consumption of the ADS1220

while in power-down.

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Using the ADS1220EVM ADCPro Plug-in

4.2 I/O Config Tab

The ADS1220 can acquire data from only one channel at a time. The I/O Config tab (as shown in

Figure 2) provides control of the MUX selection. MUX selections correspond to settings described in the

ADS1220 product data sheet. The remaining control settings discussed in this document also correspond

to settings described in the product data sheet.

Figure 2. I/O Config

Operating Mode controls the speed of the modulator clock. Depending on the Operating Mode selected

from the drop-down menu, the Data Rate changes appropriately. Normal is the normal operating mode of

the ADS1220, Turbo doubles the Data Rate from Normal, and Duty-Cycle mode reduces the Data Rate

from Normal by four.

FIR Filter settings enable changes to be made to the output response of the digital filter. The default

condition is to have No 50/60 Hz Rejection. Other options from the drop-down menu allow for

Simultaneous 50/60 Hz Rejection,50 Hz Rejection Only, or 60 Hz Rejection Only.

Four other button options appear on the I/O Config tab. The first button controls the PGA Bypass. When

the PGA Bypass button is active (indicated when lit green), the Gain choice is limited to 1, 2, or 4. The

benefit of using PGA Bypass is removing the common-mode input restriction of the PGA so the full

analog supply range for single-ended measurements can be used. This benefit, however, comes at the

cost of lowered input impedance for the ADS1220.

The Burnout Current Sources button controls the 10-µA burnout current sources. When this button is lit

green, the burnout current is routed through the selected MUX channel and detects any breaks or shorts

to a connected sensor.

SBAU203–July 2013 ADS1x20EVM

Using the ADS1220EVM ADCPro Plug-in

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When the Internal Temperature Sensor button is activated and lit green, the output result from the

ADS1220 is the response of the internal temperature sensor of the ADS1220. The temperature sensor is a

precision device and can monitor the internal temperature of the ADS1220. The temperature sensor can

also be used for making cold-junction temperature measurements when using thermocouples.

When lit green, the Low-Side Power Switch button allows for direct connection of the AIN3 input to

AVSS while the ADS1220 is converting. This connection is useful when making bridge-type

measurements and trying to conserve power. Power conservation is due to bridge excitation only taking

place while the ADS1220 is converting. Demonstrating the usefulness of this option using the

ADS1220EVM plug-in is difficult because the ADS1220 is always collecting data in the continuous

conversion mode of operation. However, power savings can be calculated by comparing the total power

used while converting, as compared to the total power of the power-down mode.

4.3 Current & Ref Tab

The Current & Ref tab allows various reference options to be selected along with the control and routing

of IDAC currents, as shown in Figure 3.

Figure 3. Current and Ref

Reference Select selects the reference for the ADS1220. The drop-down menu lists four options. The

Internal Reference selection uses the ADS1220-derived, 2.048-V reference. The three remaining options

use the voltage connected to the REFP0,REFP1, or the analog supply voltage (AVDD). When using a

test plug-in with ADCPro, the output results displayed as volts are determined according to the VREF

indicator voltage. The value of VREF defaults to 2.048 V, which is the internal voltage reference of the

ADS1220. When using an external reference, change the VREF indicator to the appropriate reference

voltage value. This adjustment ensures that the results displayed in the test plug-in of ADCPro are

changed to the correct value.

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Using the ADS1220EVM ADCPro Plug-in

The IDAC Magnitude drop-down menu allows the choice of current settings for the constant-current

output digital-to-analog converters (DACs) of the ADS1220. Two current output DACs are available and

can be routed independent of one another through the IDAC 1 Routing and IDAC 2 Routing controls.

However, the IDAC Magnitude is the same for both current sources and the current output is not

independently controlled. No current sources from the IDACs if the IDAC Magnitude is Off. This condition

is true even if the IDAC routing controls have the IDACs routed to a specified output. The seven output

current magnitude options are 10uA, 50uA, 100uA, 250uA, 500uA, 1000uA, and 1500uA. If both IDACs

are routed to the same output, the IDAC current available is twice the indicated IDAC Magnitude.

The IDAC current sources can be routed independently or to the same output. The control for the IDAC 1

Routing and IDAC 2 Routing have the same drop-down menu options. If the IDAC routing is Off, then

the IDAC being controlled is disabled and no current is sourced. This condition is true even if the IDAC

Magnitude indicates an available current. The IDAC current can be routed out through any of the analog

or reference input channels.

4.4 About Tab

The About tab provides information on the EVM hardware and software versions.

Plug-in Version is the software version of the ADCPro plug-in.

Firmware Version is the firmware version loaded and running on the processor.

SBAU203–July 2013 ADS1x20EVM

ADS1220EVM Hardware Details

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5 ADS1220EVM Hardware Details

The ADS1220EVM is designed to easily interface with other control platforms. Dual-row socket options

(JAC and JDB) are available on the bottom-side of the EVM, which allows for the controller connection.

The pin configuration of the connectors is designed to be compatible with LaunchPad. The connector

footprint conforms to Samtec™ connector SSW-110-22-F-D-VS-K, which is a dual-row, 20-pin, surface-

mount socket with a 0.1-inch pitch spacing.

Another method of controlling the ADS1220 is by connecting control signals to the test points for digital

communication to the ADS1220.

If using another controller other than the on-board MSP430, the control signals for this device must

become inoperative. To deactivate the on-board processor, short the JP5 pins, which places the output of

buffer U8 into a 3-state condition. Jumper JP5 is not installed by default. A wire can be soldered to the

terminals of JP5, or a standard 0.1-inch pitch header with shorting block can be installed.

5.1 Jumpers and Switches

Jumpers and switches function as shown in Table 4.

Table 4. Jumper and Switch Descriptions

Jumper or Functions Descriptions

Switch

Short: Connect AIN0 (EXC+ of J1.4 and J6.4) to AVDD

JP1 EXC+ source Open: AIN0 is not connected to AVDD (default)

Short: Connect AIN3 (EXC– of J1.1 and J6.1) to AGND

JP2 EXC– source Open: AIN3 is not connected to AGND (default)

Short 1 to 2 (top): AVDD is connected to +5 V

JP3 Analog supply source Short 3 to 4 (bottom): AVDD is connected to +3.3 V (default)

Short: External oscillator is used as the clock source (requires installation)

JP4 Clock source Open: On-board or external (J8) clock source (default)

Short: External controller

JP5 Digital control source Open: On-board controller

Short: Controller clock (not currently available)

JP6 External clock source Open: Connected J8 clock source (default)

Short: Powered from the USB (default)

JP7 +5-V source Open: +5 V supplied at J7 (also available at the JAC pin 2 and +5-V test

point)

Short: Regulated LDO on-board supply (default)

JP8 +3.3-V source Open: Supplied externally at JAC or to +3.3-V test point

S1 Controller reset Normally open SPST push-button resets controller on button press

Normally open SPST push-button enters controller bootstrap loader (BSL)

S2 Controller BSL mode with button press while +3.3-V power is applied

5.2 Analog Headers, Terminal Blocks, and J3

For maximum flexibility, the ADS1220EVM is designed for easy interfacing to multiple analog sources.

These connectors provide access to the analog input pins of the ADS1220.

The EVM is designed to accept multiple sensor types. The sensor types can range from thermocouples,

resistance temperature detectors (RTDs), load cells, pressure, and so forth. The analog inputs can be

filtered by installing passive components in the optional filter circuitry. By default, the series input resistors

are populated with 0-Ωresistors and the capacitors are not installed. No circuitry is provided to buffer

these signals before connecting to the converter.

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