Texas Instruments | ADS7924EVM/ADS7924EVM-PDK | User Guides | Texas Instruments ADS7924EVM/ADS7924EVM-PDK User guides

Texas Instruments ADS7924EVM/ADS7924EVM-PDK User guides
User's Guide
SBAU173 – June 2010
ADS7924EVM and ADS7924EVM-PDK User's Guide
ADS7924EVM (Left) and ADS7924EVM-PDK (Right)
This user's guide describes the characteristics, operation, and use of the ADS7924EVM, both by itself and
as part of the ADS7924EVM-PDK. This evaluation model (EVM) is an evaluation board for the ADS7924,
a 12-bit, sampling, low-power, analog-to-digital converter (ADC) with an I2C™ interface. The EVM-PDK
allows evaluation of the ADS7924 in some modes of operation, but not all. Complete circuit descriptions,
schematic diagrams, and bills of material are included in this document.
The following related documents are available for download through the Texas Instruments web site at
http://www.ti.com.
Related Documentation
Device
Literature Number
ADS7924
SBAS482
OPA363
SBOS259B
PCA9306
SCPS113I
SN74LVC1T45
SCES515I
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.
SBAU173 – June 2010
ADS7924EVM and ADS7924EVM-PDK User's Guide
Copyright © 2010, Texas Instruments Incorporated
1
www.ti.com
1
2
3
4
5
6
7
8
9
10
Contents
EVM Overview ............................................................................................................... 3
Analog Interface ............................................................................................................. 4
Digital Interface .............................................................................................................. 5
Power Supplies .............................................................................................................. 6
External Buffer ............................................................................................................... 7
EVM Operation .............................................................................................................. 7
ADS7924EVM-PDK Kit Operation ........................................................................................ 9
Evaluating Performance with the ADCPro Software .................................................................. 15
Schematics and Layout ................................................................................................... 21
Appendix: Setting Up the ADS7924EVM-PDK ........................................................................ 22
List of Figures
1
ADS7924EVM ............................................................................................................... 4
2
Jumper J11 .................................................................................................................. 7
3
ADS7924EVM Default Jumper Locations................................................................................ 8
4
Virtual COM Port Driver Installation Prompt ............................................................................. 9
5
Virtual COM Port Driver Installation ..................................................................................... 10
6
Virtual COM Port Driver Uninstall Confirmation ....................................................................... 10
7
ADCPro Software Start-up Display Window ........................................................................... 11
8
ADS7924EVM-PDK Plug-In Display Window .......................................................................... 12
9
EVM COM Port Autoscan Prompt Window ............................................................................ 13
10
Manual COM Port Selection Window ................................................................................... 13
11
Firmware Download Message ........................................................................................... 13
12
Firmware Download Progress Indicator ................................................................................ 14
13
MMB3 Firmware Download Complete .................................................................................. 15
14
AVDD Pull-Down Menu and Data Rate
15
16
17
18
19
20
21
22
23
................................................................................
ADC Tab ....................................................................................................................
Interrupts Tab ..............................................................................................................
Alarms Tab .................................................................................................................
About Tab ..................................................................................................................
Progress Bar While Acquiring Data .....................................................................................
MMB3 Initial Setup .......................................................................................................
Connecting ADS7924EVM to MMB3 ...................................................................................
MMB3 Block Diagram .....................................................................................................
MMB3 .......................................................................................................................
15
16
17
18
19
20
22
23
24
25
List of Tables
2
...........................................................................................
1
J1, J4: Analog Interface Pinout
2
J3: Serial Interface Pins .................................................................................................... 5
3
J2 Configuration: Power-Supply Input .................................................................................... 6
4
J7 Configuration: Power Options
5
List of Configured Jumpers ................................................................................................ 8
6
List of Switches .............................................................................................................. 8
7
Bill of Materials
.........................................................................................
............................................................................................................
ADS7924EVM and ADS7924EVM-PDK User's Guide
Copyright © 2010, Texas Instruments Incorporated
4
6
21
SBAU173 – June 2010
EVM Overview
www.ti.com
1
EVM Overview
1.1
Features
ADS7924EVM:
• Contains all support circuitry needed for the ADS7924
• Buffer options: Onboard analog input buffer can be bypassed
• Compatible with the TI Modular EVM System
ADS7924EVM-PDK:
• 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 ADS7924EVM-PDK is available. This kit combines the ADS7924EVM board
with the MSP430-based MMB3 motherboard, and includes ADCPro™ software for device evaluation.
The MMB3 motherboard allows the ADS7924EVM to be connected to the computer via an available USB
port. This manual shows how to use the MMB3 as part of the ADS7924EVM-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 ADS7924EVM-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 website.
This manual covers the operation of both the ADS7924EVM and the ADS7924EVM-PDK. Throughout this
document, the abbreviation EVM and the term evaluation module are synonymous with the
ADS7924EVM.
SBAU173 – June 2010
ADS7924EVM and ADS7924EVM-PDK User's Guide
Copyright © 2010, Texas Instruments Incorporated
3
Analog Interface
1.2
www.ti.com
Introduction
The ADS7924EVM, shown in Figure 1, is an evaluation module built to the TI Modular EVM System
specification. It can be connected to any modular EVM system interface card.
The ADS7924EVM is available as a stand-alone printed circuit board (PCB) or as part of the
ADS7924EVM-PDK, which includes an MMB3 motherboard and software. As a stand-alone PCB, the
ADS7924EVM is useful for prototyping designs and firmware.
Note that the ADS7924EVM has no microprocessor and cannot run software. To connect it to a computer,
some type of interface is required.
Figure 1. ADS7924EVM
2
Analog Interface
For maximum flexibility, the ADS7924EVM 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 ADS7924. Consult Samtec at http://www.samtec.com or call 1-800-SAMTEC-9 for a variety of mating
connector options. These signals can also be connected to the terminal block J4.
All of the pins on J1 and J4 are directly connected to the inputs of the ADS7924. Use appropriate caution
when handling these pins. Table 1 summarizes the pinouts for analog interfaces J1 and J4.
Table 1. J1, J4: Analog Interface Pinout
4
Pin Number
Signal
J1.2, J4-6
CH3
Analog input channel 3
Description
J1.4, J4-5
CH2
Analog input channel 2
J1.6, J4-4
CH1
Analog input channel 1
J1.8, J4-3
CH0
Analog input channel 0
J4-2
ADCIN
ADC input
J1.18
REF–
Unused
J1.20
REF+
Unused
J1.10-16 (even)
Unused
Unused
J1.1-19 (odd), J4-1
AGND
Analog ground connections
ADS7924EVM and ADS7924EVM-PDK User's Guide
Copyright © 2010, Texas Instruments Incorporated
SBAU173 – June 2010
Digital Interface
www.ti.com
3
Digital Interface
3.1
Serial Data Interface
The ADS7924EVM 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
Pull-Up
J3.1
CNTL
RST_H
In
None
Function
J3.2
GPIO0
Unused
—
None
J3.3
CLKX
Unused
—
None
J3.4
DGND
DGND
In/Out
None
J3.5
CLKR
Unused
—
None
J3.6
GPIO1
Unused
—
None
J3.7
FSX
Unused
—
None
J3.8
GPIO2
Unused
—
None
J3.9
FSR
Unused
—
None
J3.10
DGND
DGND
In/Out
None
J3.11
DX
Unused
—
None
J3.12
GPIO3
Unused
—
None
J3.13
DR
Unused
—
None
J3.14
GPIO4
Unused
—
None
J3.15
INT
INT_H
Out
None
ADS7924 interrupt
J3.16
SCL
SCL_H
I2C
High
I2C clock
J3.17
TOUT
Unused
—
None
J3.18
DGND
DGND
In/Out
None
J3.19
GPIO5
Unused
—
None
J3.20
SDA
SDA
I2C
High
ADS7924 reset
Digital ground
Digital ground
Digital ground
I2C data
Some pins on J3 have weak pull-up resistors. These resistors provide default settings for many of the
control pins. Many pins on J3 correspond to ADS7924 pins and are connected to them through either
voltage-level translators or the I2C bus level translator. See the ADS7924 product data sheet for complete
details on these pins.
3.2
Data Output
All output data communications are directed through the I2C communication protocol. The data from all
channels can be observed through monitoring SDA_H and SCL_H. These signals are used by the
ADS7924EVM-PDK to read back and display all the channel data via the ADCPro Software.
SBAU173 – June 2010
ADS7924EVM and ADS7924EVM-PDK User's Guide
Copyright © 2010, Texas Instruments Incorporated
5
Power Supplies
4
www.ti.com
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
Unused
No
J2.2
–VA
Unused
No
J2.3
+5VA
+5V analog supply
Always
J2.4
–5VA
–5V analog supply
No
J2.5
DGND
Digital ground input
Yes
J2.6
AGND
Analog ground input
Yes
J2.7
+1.8VD
1.8V digital supply
Sometimes
J2.8
VD1
Unused
No
J2.9
+3.3VD
3.3V digital supply
Always
J2.10
+5VD
+5V
No
All of the power supplies (VDD and BVDD) have corresponding jumpers on J7 that can be replaced with a
current meter to measure the respective supply currents.
4.1
Power Options
J7 is arranged as four rows, each of which can be shorted. Table 4 lists the power option details for J10.
For normal operation, J7.1-2, J7.3-4, J7.5-6, and J7.7-8 must be connected (direct or through an ammeter
otherwise, the board does not function.
Table 4. J7 Configuration: Power Options
Row
Name
1-2
ADC VDD
3-4
ADC BVDD
Function
VDD supply point for the ADC. Must be connected
for operation.
BVDD supply point for the ADC. Must be connected
for operation.
5-6
AGND
Connects AGND to board ground.
7-8
DGND
Connects AGND to board ground.
space
Switches S1 and S2 are also used to select the operational voltage of the EVM. Switch S1 selects the
VDD voltage for the EVM from J2.3 (+5VA) or J2.9 (+3.3VD). Switch S2 selects the BVDD voltage for the
EVM from J2.3 (+5VA), J2.7 (+1.8VD) or J2.9 (+3.3VD).
6
ADS7924EVM and ADS7924EVM-PDK User's Guide
Copyright © 2010, Texas Instruments Incorporated
SBAU173 – June 2010
External Buffer
www.ti.com
5
External Buffer
The ADS7924 device has the option of selecting an external buffer going from MUXOUT to ADCIN. An
OPA363 can be used as a buffer and is selected through the configuration of J11. Connecting pins 1 and
2 together will bypass the external buffer, while connecting pins 1 and 3 and pins 2 and 4 will complete
the circuit for the buffer. Figure 2 shows jumper J11 as it appears on the EVM in its default position, using
the buffer.
Figure 2. Jumper J11
6
EVM Operation
This section provides information on the analog input, digital control, and general operating conditions of
the ADS7924EVM.
6.1
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 modular EVM system. Terminal block J4 is connected in
parallel with the analog signal connections to J1.
6.2
Digital Control
The digital control signals can be applied directly to J3 (top or bottom side). The modular ADS7924EVM
can also be connected directly to a DSP or microcontroller interface board, such as the 5-6K Interface
EVM or HPA-MCU Interface boards available from Texas Instruments, or the MMB3 if purchased as part
of the ADS7924EVM-PDK. For a list of compatible interface and/or accessory boards for the EVM or the
ADS7924, see the relevant product folder on the TI web site.
SBAU173 – June 2010
ADS7924EVM and ADS7924EVM-PDK User's Guide
Copyright © 2010, Texas Instruments Incorporated
7
EVM Operation
6.3
www.ti.com
Default Jumper Settings and Switch Positions
Figure 3 shows the jumpers found on the EVM and the respective factory default conditions for each.
Figure 3. ADS7924EVM Default Jumper Locations
Table 5 lists the jumpers found on the EVM and the factory default conditions for each of the configurable
jumpers.
Table 5. List of Configured Jumpers
Jumper
Default Position
Switch Description
J5.1-J5.2
Connected
I2C address selector
J6.1-J5.2
Connected
Analog and digital ground connector
J7.1-J7.2
Connected
VDD connector
J7.3-J7.4
Connected
BVDD connector
J7.5-J7.6
Connected
AGND connector
J7.7-J7.8
Connected
DGND connector
J11.1-J11.3
Connected
ADS7924 MUXOUT to buffer in
J11.2-J11.4
Connected
Buffer out to ADS7924 ADCIN
Table 6 lists the switches found on the EVM and the respective factory default conditions for each.
Table 6. List of Switches
8
Switch
Default Position
S1
Left
Switch Description
VDD = +5VA
S2
Center
BVDD = +3.3VD
ADS7924EVM and ADS7924EVM-PDK User's Guide
Copyright © 2010, Texas Instruments Incorporated
SBAU173 – June 2010
ADS7924EVM-PDK Kit Operation
www.ti.com
7
ADS7924EVM-PDK Kit Operation
This section provides information on using the ADS7924EVM-PDK, including setup, program installation,
and program usage.
To prepare
Step 1.
Step 2.
Step 3.
Step 4.
Step 5.
Step 6.
to evaluate the ADS7924 with the ADS7924EVM-PDK, complete the following steps:
Install the ADCPro software (if not already installed) on a PC.
Install the ADS7924EVM-PDK EVM plug-in software.
Complete the USB driver installation process.
Set up the ADS7924EVM-PDK.
Connect the ADS7924EVM-PDK to the computer with a USB cable.
Run the ADCPro software.
Each task is described in the subsequent sections of this document.
7.1
Installing the ADCPro Software
CAUTION
Do not connect the ADS7924EVM-PDK before installing the software on a
suitable PC. Failure to observe this caution may cause Microsoft Windows to
not recognize the ADS7924EVM-PDK as a connected device.
The CD-ROM shipped with the ADS7924EVM contains an installer for ADCPro as well as an installer for
the ADS7924EVM plug-in for ADCPro. The latest software is available from the TI website at
http://www.ti.com/. The updated ADCPro software can be downloaded directly from the TI web site
(http://www.ti.com/adcpro) or the update check command can be used. Refer to the ADCPro User Guide
for instructions on installing and using ADCPro.
To install the ADS7924EVM-PDK plug-in, run the file: ads7924evm-pdk-plug-in-1.0.0.exe (1.0.0 is the
version number, and increments with software version releases; you may have a different version on the
CD). 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 ADS7924EVM-PDK plug-in, once you have
installed one version of it.
Follow the on-screen prompts. Once the ADCPro plug-in installs, a window will appear, asking if the
Virtual COM Port driver has been previously installed on your PC, as shown in Figure 4.
Figure 4. Virtual COM Port Driver Installation Prompt
SBAU173 – June 2010
ADS7924EVM and ADS7924EVM-PDK User's Guide
Copyright © 2010, Texas Instruments Incorporated
9
ADS7924EVM-PDK Kit Operation
www.ti.com
If the Virtual COM Port driver has already been installed, press the Yes option. If not, press No; the
software will continue with the TUSB3410 installation. The screen shown in Figure 5 appears. The Cancel
button will stop the installation process.
Figure 5. Virtual COM Port Driver Installation
Once the InstallShield wizard is complete, the software will first prompt an uninstall process that will
remove any previous versions of the software. To continue, press OK as shown in Figure 6.
Figure 6. Virtual COM Port Driver Uninstall Confirmation
To continue with the Virtual COM Port setup, follow the prompts presented to you through the licensing
agreement and the rest of the software installation.
10
ADS7924EVM and ADS7924EVM-PDK User's Guide
Copyright © 2010, Texas Instruments Incorporated
SBAU173 – June 2010
ADS7924EVM-PDK Kit Operation
www.ti.com
7.2
EVM Power Supply
The ADS7924EVM-PDK is powered completely from the USB connection on the MMB3. The MMB3
provides 3.3V and ±5V to the ADS7924EVM.
7.3
Running the Software and Download of Firmware to MMB3
NOTE:
The software is continually under development. These instructions and screen images are
current at the time of this writing, but may not exactly match future releases.
The program for evaluating the ADS7924EVM-PDK is called ADCPro. This program uses a series of
software plug-ins to communicate with the EVM. The ADS7924EVM-PDK plug-in is included in the
ADS7924EVM-PDK package.
If this is the first time to install ADCPro and the plug-ins, follow these procedures to run ADCPro and
complete the necessary driver installation. Make sure the ADCPro software and device plug-in software
are installed from the CD-ROM as described in Section 7.1, Installing the ADCPro Software.
The program currently runs only on Microsoft Windows platforms of Windows XP; Windows Vista and
Windows 7 are NOT supported.
Follow this procedure to run the ADCPro software and download the firmware to the MMB3.
space
1. Start the software by selecting ADCPro from the Windows Start menu. The screen in Figure 7 appears.
Figure 7. ADCPro Software Start-up Display Window
SBAU173 – June 2010
ADS7924EVM and ADS7924EVM-PDK User's Guide
Copyright © 2010, Texas Instruments Incorporated
11
ADS7924EVM-PDK Kit Operation
www.ti.com
2. Select ADS7924EVM from the EVM drop-down menu. The ADS7924EVM-PDK plug-in appears in the
left pane, as shown in Figure 8.
Figure 8. ADS7924EVM-PDK Plug-In Display Window
The ADS7924EVM-PDK plug-in window has a status area at the top of the screen. When the plug-in is
first loaded, the plug-in searches for the board. You will see a series of messages in the status area
indicating this action.
12
ADS7924EVM and ADS7924EVM-PDK User's Guide
Copyright © 2010, Texas Instruments Incorporated
SBAU173 – June 2010
ADS7924EVM-PDK Kit Operation
www.ti.com
3. If the plug-in cannot connect to the EVM, you will see a window as shown in Figure 9. This message
indicates that the autoscan process for an available COM port has failed, giving you several different
options.
Figure 9. EVM COM Port Autoscan Prompt Window
4. If the Rescan option is unsuccessful, you can manually set the COM port to connect to the EVM. The
Manual COM Port selection window is shown in Figure 10.
Figure 10. Manual COM Port Selection Window
5. The plug-in will detect whether or not the board has the correct firmware loaded. The first time you use
the ADS7924EVM-PDK, the firmware for the MMB3 may need to be downloaded to the MMB3. If the
firmware must be loaded, you will see a screen as shown in Figure 11.
Figure 11. Firmware Download Message
SBAU173 – June 2010
ADS7924EVM and ADS7924EVM-PDK User's Guide
Copyright © 2010, Texas Instruments Incorporated
13
ADS7924EVM-PDK Kit Operation
www.ti.com
6. Switch the BSL switch (SW4) on the MMB3 to the BSL position (to the left) as instructed, then press
OK. The plug-in will download the firmware to the MMB3. This operation may take a couple of
minutes, so the progress is updated in the message at the top of the ADS7924 plug-in window (as
Figure 12 shows). The firmware is saved in flash memory on the MMB3, so this operation should need
to only be performed once.
Figure 12. Firmware Download Progress Indicator
14
ADS7924EVM and ADS7924EVM-PDK User's Guide
Copyright © 2010, Texas Instruments Incorporated
SBAU173 – June 2010
Evaluating Performance with the ADCPro Software
www.ti.com
7. When the firmware download completes, the message box shown in Figure 13 appears. Follow the
on-screen instructions and the plug-in should now connect to the EVM.
Figure 13. MMB3 Firmware Download Complete
8
Evaluating Performance with the ADCPro Software
The evaluation software is based on ADCPro, a program that operates using a variety of plug-ins. (The
ADS7924EVM plug-in is installed as described in the installation section, Section 7.3, Running the
Software and Download of Firmware to MMB3.)
To use ADCPro, load an EVM plug-in and a test plug-in. To load an EVM plug-in, select it from the EVM
menu. To load a test plug-in, select it from the Test menu. To unload a plug-in, select the Unload option
from the corresponding menu.
Only one of each kind of plug-in can be loaded at a time. If you select a different plug-in, the previous
plug-in is unloaded.
8.1
Using the ADS7924EVM-PDK Plug-in
The ADS7924EVM-PDK plug-in for ADCPro provides complete control over all settings of the ADS7924. It
consists of a tabbed interface (see Figure 8), with different functions available on different tabs. These
controls are described in this section.
At the top of the plug-in is a pull-down menu indicating AVDD. Make sure that the switch S1 on the EVM
matches the setting shown in the menu. This voltage is used in calculating the voltage based on the
output data when using the MultiHistogram tester plug-in.
The data rate is also displayed at the top of the plug-in window. This rate is calculated based on the ADC
Operation mode, the Acq Period and the Power-up Period of PWRCON in the ADC tab of the plug-in. The
AVDD pull-down menu and data rate window are shown in Figure 14.
Figure 14. AVDD Pull-Down Menu and Data Rate
SBAU173 – June 2010
ADS7924EVM and ADS7924EVM-PDK User's Guide
Copyright © 2010, Texas Instruments Incorporated
15
Evaluating Performance with the ADCPro Software
8.1.1
www.ti.com
ADC Configuration Tab
The first tab of the ADS7924EVM plug-in is the ADC tab. This tab controls the I2C selection, ADC
operation, sleep functions, and the PWRCON control for the external buffer. There are four sections within
this tab. The ADC tab is shown in Figure 15.
Figure 15. ADC Tab
The first section controls the I2C address. Select the I2C address used to communicate with the part (either
18h or 19h as the 7-bit address, depending on the installation of jumper J5). The Ack indicator indicates
the slave acknowlege with a green light. If the slave does not acknowledge the master, then a red light
appears.
The second section shows the controls for ADC operation. While the Manual Trigger modes are not
available in this plug-in, the five auto-trigger modes can be set by the pulldown menu. Auto bursttrig/sleep
scan, Auto trig/sleep scan, Auto trig/sleep single, Auto trig scan, and Auto trig single are all available. To
the right of the mode selection, a particular channel (CH0-CH3) can be selected for the Auto trig/sleep
single and the Auto trig single modes. For data rate timing, the acquisition period can be set from 6µs to
62µs in factors of 2µs. The Offset Monitor Enable corresponds to bit 7 of the PWRCONFIG register and is
used for routing the multiplexer. This option will either route channel 3 or AGND to the MUXOUT. This
feature can also be used in the calibration process to monitor the offset.
The third section is used for Sleep Control. The first tab is the Sleep Period; this period can be set from
one internal clock cycle to 128 internal clock cycles. The Sleep Frequency can be set at either 400Hz or
1.6kHz.
The final section of the ADC tab is the PWRCON section. This section controls the external buffer. A
check button enables this function. The polarity of the PWRCON pin is selected to be Active High or
Active Low, while the timing of the Power-up Period can be set from 0µs to 62µs in factors of 2µs.
16
ADS7924EVM and ADS7924EVM-PDK User's Guide
Copyright © 2010, Texas Instruments Incorporated
SBAU173 – June 2010
www.ti.com
8.1.2
Evaluating Performance with the ADCPro Software
Interrupts Tab
The second tab of the ADS7924EVM plug-in is the Interrupts tab. This tab corresponds primarily to the
Interrupt CONFIG Register of the ADS7924. A set of pushbuttons are used to control the bit selections
within this register. The Interrupts tab is shown in Figure 16.
Figure 16. Interrupts Tab
The BUSY/INT Select allows the user to generate an interrupt or a BUSY signal. The Edge/Level INT can
be programmed to either be level-triggered or edge-triggered. The INT Polarity can be set to be either
active low or active high. ALARM/ADC Data Ready is used to program the pin to generate an interrupt on
an alarm or as the ADC data are ready.
The User-programmed Counter (three bits) programs a count from 0 to 7. This function is a programmable
global alarm threshold to filter false alarms.
When the INT pin is programmed as the ADC data ready, the interrupt can be programmed to be
generated after a conversion is complete from any channel or after the last converted channel in scan
mode.
Delay on INT corresponds to a bit in the Sleep Control Register of the ADS7924. This bit controls whether
the conversions continue independently of alarms and the conversion overwrites previous data, or if future
conversions are stopped until the interrupt is cleared.
SBAU173 – June 2010
ADS7924EVM and ADS7924EVM-PDK User's Guide
Copyright © 2010, Texas Instruments Incorporated
17
Evaluating Performance with the ADCPro Software
8.1.3
www.ti.com
Alarms Tab
The Alarms tab of the ADS7924EVM plug-in is shown in Figure 17. The ADS7924 offers an independent
alarm control that can be enabled for each channel. An 8-bit upper limit and lower limit can be set
independently. An alarm indicator shows the alarm status.
Once you have configured the ADS7924 for your test scenario, press the ADCPro Acquire button to start
the collection of the number of datapoints specified in the Test plug-in Block Size control. The
ADS7924EVM-PDK plug-in disables all the front panel controls while acquiring, and displays a progress
bar as shown in Figure 17.
Figure 17. Alarms Tab
18
ADS7924EVM and ADS7924EVM-PDK User's Guide
Copyright © 2010, Texas Instruments Incorporated
SBAU173 – June 2010
www.ti.com
8.1.4
Evaluating Performance with the ADCPro Software
About Tab
The About tab displays information about the EVM and software, as shown in Figure 18. The Plugin
Version and Firmware Version indicators show the version numbers of the plug-in and firmware code,
respectively. The Notes indicator may show relevant notes about the released plug-in or firmware code, if
any are available.
Figure 18. About Tab
SBAU173 – June 2010
ADS7924EVM and ADS7924EVM-PDK User's Guide
Copyright © 2010, Texas Instruments Incorporated
19
Evaluating Performance with the ADCPro Software
8.2
www.ti.com
Collecting Data
Once you have configured the ADS7924 for your test scenario, press the ADCPro Acquire button to start
the collection of the number of datapoints specified in the Test plug-in Block Size control. The
ADS7924EVM-PDK plug-in disables all the front panel controls while acquiring data, and displays a
progress bar as Figure 19 shows.
Figure 19. Progress Bar While Acquiring Data
8.3
Troubleshooting
If the ADS7924EVM plug-in cannot find the ADS7924EVM-PDK, press the USB RESET button on the
MMB3 (refer to Figure 22) and try again.
If ADCPro stops responding while the ADS7924EVM-PDK is connected, try unplugging the USB cable
from the MMB3. Unload and reload the plug-in before reapplying power to the PDK. For more information
on testing analog-to-digital converters in general and using ADCPro and Test plug-ins, refer to the
ADCPro User Guide.
20
ADS7924EVM and ADS7924EVM-PDK User's Guide
Copyright © 2010, Texas Instruments Incorporated
SBAU173 – June 2010
Schematics and Layout
www.ti.com
9
Schematics and Layout
Schematics for the ADS7924EVM are appended to this user's guide. The bill of materials is provided in
Table 7.
9.1
Bill of Materials
Table 7. Bill of Materials
Item No.
Qty
Value
Ref Des
1
1
2.2mF
C4
Description
Manufacturer
2
8
0.1mF
C3, C5, C6, C7,
C8, C9, C10, C11
25V ceramic chip capacitor, ±10%, 0603
TDK
C1608X7R1E104K
3
2
10mF
C1, C2
16V ceramic chip capacitor, ±20%, X5R
0805
TDK
C2012X5R1C106M
4
1
D1
Light-emitting diode, red 0805
Lumex
SML-LXT0805IW-TR
5
2
J1A, J3A
20-pin SMT plug
Samtec
TSM-110-01-L-DV-P
6
2
J1B, J3B
20-pin SMT socket
Samtec
SSW-110-22-F-D-VS-K
7
1
J2A
10-pin SMT plug
Samtec
TSM-105-01-L-DV-P
8
1
J2B
10-pin SMT socket
Samtec
SSW-105-22-F-D-VS-K
9
3
J4
10
2
J5,J6
1 × 2 header
Samtec
TSW-102-07-G-S
11
1
J7
2 × 4 header
Samtec
TSW-104-07-G-D
12
0
J8
Not installed
—
—
13
0
J9
Not installed
—
—
14
1
J11
2 × 2 header
Samtec
TSW-102-07-G-D
15
2
J10
1 X 4 header
Samtec
TSW-104-07-G-S
16
1
Q1
N-Channel MOSFET
17
1
100Ω
R1
1/10W 1% chip resistor 0603
Panasonic
ERJ-3EKF1000V
18
1
470Ω
R2
1/10W 1% chip resistor 0603
Panasonic
ERJ-3EKF4700V
19
1
10kΩ
R3
1/10W 1% chip resistor 0603
Panasonic
ERJ-3EKF1002V
20
1
200kΩ
R4
1/10W 1% chip resistor 0603
Panasonic
ERJ-3EKF2003V
21
1
1kΩ
RA1
Resistor array, 100Ω, eight-terminal,
four-resistor SMD
CTS
742C083102JPTR
22
1
100kΩ
RA2
Resistor array, 100kΩ, eight-terminal,
four-resistor SMD
CTS
742C083104JPTR
23
1
S1
SPDT slide switch, top actuator
NKK
SS12SDP2
24
1
S2
SP3T Switch slide ultra miniactuator, top
NKK
SS14MDP2
25
0
TP1, TP2, TP4,
TP5, TP5, TP6
26
2
TP3, TP7
27
1
28
29
50V ceramic chip capacitor, ÷5%, C0G
0603
3.5mm PCB terminal position block, 6
Not installed
Part Number
GRM1885C1H222JA01D
On Shore
Technology
Fairchild
Semiconductor
—
ED555/6DS
FDN337N
—
Testpoint
Keystone
Electronics
5011
U1
12-bit, analog-to-digital converter,
four-channel
Texas
Instruments
ADS7924IRTER
1
U2
Op-amp, single w/enableSOT23-6
Texas
Instruments
OPA363IDBVR
1
U3
EEPROM, 1.8V, 256k
Microchip
24AA256-I/ST
30
1
U4
31
2
U5, U6
32
1
33
8
SBAU173 – June 2010
2
I C bus level translator
Texas
Instruments
PCA9306DCTR
Single split-rail level shifter
Texas
Instruments
SN74LVC1T45DBV
N/A
ADS7924 EVM PWB
Texas
Instruments
6516247
N/A
Shorting block
Samtec
SNT-100-BK-G
ADS7924EVM and ADS7924EVM-PDK User's Guide
Copyright © 2010, Texas Instruments Incorporated
21
Appendix: Setting Up the ADS7924EVM-PDK
10
www.ti.com
Appendix: Setting Up the ADS7924EVM-PDK
The ADS7924EVM-PDK contains both the ADS7924EVM and the MMB3 motherboard; the devices are
shipped connected. However, if you only order the ADS7924EVM and already have the MMB3, you must
make sure the MMB3 is set back to its default conditions in order to load the firmware onto the
motherboard. Follow these steps to set up the ADS7924EVM-PDK
Step 1. Unpack the ADS7924EVM kit.
Step 2. Set the jumpers and switches on the MMB3 as shown in Figure 20.
• Set switch SW4 to the right.
• Set the DAC switch (SW5) to the OUT position (to the right).
Figure 20. MMB3 Initial Setup
22
ADS7924EVM and ADS7924EVM-PDK User's Guide
Copyright © 2010, Texas Instruments Incorporated
SBAU173 – June 2010
Appendix: Setting Up the ADS7924EVM-PDK
www.ti.com
3. Plug the ADS7924EVM into the MMB3 as Figure 21 illustrates.
Figure 21. Connecting ADS7924EVM to MMB3
CAUTION
Do not misalign the pins when plugging the ADS7924EVM into the MMB3.
Check the pin alignment carefully before applying power to the PDK.
Step 3.
Set the jumpers and switches on the ADS7924EVM as shown in Figure 3 (note that these
settings are the factory-configured settings for the EVM).
Once this is completed, then load the ADS7924EVM plug-in and follow the instructions (refer to
Section 7.3) to load the firmware.
SBAU173 – June 2010
ADS7924EVM and ADS7924EVM-PDK User's Guide
Copyright © 2010, Texas Instruments Incorporated
23
Appendix: Setting Up the ADS7924EVM-PDK
www.ti.com
10.1 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 22 shows a block diagram of the MMB3. Figure 23
illustrates the MMB3.
USB
USB
RESET
+5VA
-5VA
+5VD
PWR & VREF
+3.3V
+1.8V
+10V
TUSB3410
-10V
Supplied to
Daughtercard
Power Connector
LCD DISPLAY
2.5V
OPER
BSL
+1
DAC1220
MSP430F449
RESET
-1
DAC
IN
OUT
Analog
Daughtercard
Modular
Connectors
Serial
Power
Joystick
Power from
PWR & VREF Block
Figure 22. MMB3 Block Diagram
24
ADS7924EVM and ADS7924EVM-PDK User's Guide
Copyright © 2010, Texas Instruments Incorporated
SBAU173 – June 2010
Appendix: Setting Up the ADS7924EVM-PDK
www.ti.com
Figure 23. MMB3
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 user control of functions on the board when it is not
controlled by a PC. These features are experimental and not supported in the ADS7924EVM-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 ±10V. The ±10V is supplied to the daughtercard power connector as +VA and –VA.
The MMB3 is not sold as a DSP 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.
SBAU173 – June 2010
ADS7924EVM and ADS7924EVM-PDK User's Guide
Copyright © 2010, Texas Instruments Incorporated
25
1
2
4
REVISION HISTORY
3
REV
TP3
AGND
1
TP7
DGND
J6
TP4
VDD
BVDD
TP6
+3.3VD
C1
C2
10uF
10uF
JPR-2X1
D
BVDD +3.3VD
BVDD
PWRCON
R3
10k
ADCIN
6
2
CH2
12
A0
DGND
CH0
RESET
DAUGHTER-ANALOG
VDD
+5V
+3.3VD
+1.8VD
OPA363IDBV
U2
EN
BVDD
C10
C11+3.3VD
0.1uF
0.1uF
U5
1
3
2
VDD
6
4
5
VCCA VCCB
A
B
GND
DIR
BVDD
+3.3VD
C6
C8
C9 +3.3VD
0.1uF
0.1uF
J10
R1
100
1
2
3
4
C4
2.2nF
PWRCON
U6
1
3
2
6
4
5
VCCA VCCB
A
B
GND
DIR
J7
2
4
6
8
BVDD
JUMPER FUNCTIONS
BVDD
U4
7
8
5
6
VREF2 VREF1
EN
SDA2
SDA1
SCL2
SCL1
GND
SN74LVC1T45DBV
2
B
4
3
1
PCA9306DCT
+3.3VD
ADC VDD
ADC BVDD
AGND
DGND
RA2
100K
ti
JPR-2X4
U3
J8
1
3
5
J2
1
3
5
7
9
+VA
-VA
+5VA
-5VA
DGND AGND
+1.8VD
VD1
+3.3VD +5VD
2
4
6
8
10
2
4
6
HEADER-3X2
1
2
3
7
A0
A1
A2
WP
+3.3VD
VCC
SDA
SCL
GND
8
5
6
4
PRECISION ANALOG PRODUCTS
C5
0.1uF
HIGH-PERFORMANCE ANALOG DIVISION
SEMICONDUCTOR GROUP
MCP_24AA256-I/ST
5411 EAST WILLIAMS BOULEVARD, TUCSON, AZ 85711 USA
DAUGHTER-POWER
J2A (TOP) = SAM_TSM-105-01-L-DV-P
J2B (BOTTOM) = SAM_SSW-105-22-F-D-VS-K
ENGINEER
JOSEPH WU
DRAWN BY
JOSEPH WU
TITLE
DOCUMENT CONTROL NO. 6516247
SHEET
1
0.1uF
200k
VDD
1
3
5
7
S2
NKK_SS14MDP2
A
C7
R4 0.1uF
HEADER-4
S1
SW-SPDT
C
J3A (TOP) = SAM_TSM-110-01-L-DV-P
J3B (BOTTOM) = SAM SSW-110-22-F-D-VS-K
FDN337N
BVDD
1
J9
JPR-2X2
SERIALHDR
16
15
INT
TP2
BUFOUT
-V
5
3
+V
2
Q1
2
4
6
8
10
12
14
16
18
20
GPIO0
DGND
GPIO1
GPIO2
DGND
GPIO3
GPIO4
SCL
DGND
SDA
SN74LVC1T45DBV
0.1uF
2
4
B
2
4
SCL
JPR-2X2
C3
6
J1A (TOP) = SAM_TSM-110-01-L-DV-P
J1B (BOTTOM) = SAM SSW-110-22-F-D-VS-K
J11
14
13
1
3
SDA
U1
BVDD
TP1
BUFIN
4
3
1 /RESET
BVDD
CH3
CH2
CH1
CH0
2
4
6
8
10
12
14
16
18
20
A0(+)
A1(+)
A2(+)
A3(+)
A4
A5
A6
A7
REFREF+
INT
ADCIN
A0(-)
A1(-)
A2(-)
A3(-)
AGND
AGND
AGND
VCOM
AGND
AGND
CH1
VDD
J1
SCL
ADS7924IRTE
MUXOUT
11
D1
LED
SDA
CNTL
CLKX
CLKR
FSX
FSR
DX
DR
INT
TOUT
GPIO5
SDA_H
SCL_H
CH3
ADCIN
9
10
PWRCON
AGND
JPR-2X1
C
J3
3
5
7
9
11
13
INT_H15
17
19
5
7
8
1
RST_H 1
R2
470
3
1
+3.3VD
J5
4
2
J4
TERMBLOCK-MINI-6
D
RA1
1K
Bypass Capacitors for ADS7924
1
3
5
7
9
11
13
15
17
19
APPROVED
TP5
BVDD
VDD
2
ENGINEERING CHANGE NUMBER
2
3
1 OF 1
SIZE A
ADS7924EVM
DATE
24-MAY-2010
FILE
4
REV A
A
Evaluation Board/Kit Important Notice
Texas Instruments (TI) provides the enclosed product(s) under the following conditions:
This evaluation board/kit is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION, OR EVALUATION
PURPOSES ONLY and is not considered by TI to be a finished end-product fit for general consumer use. Persons handling the
product(s) must have electronics training and observe good engineering practice standards. As such, the goods being provided are
not intended to be complete in terms of required design-, marketing-, and/or manufacturing-related protective considerations,
including product safety and environmental measures typically found in end products that incorporate such semiconductor
components or circuit boards. This evaluation board/kit does not fall within the scope of the European Union directives regarding
electromagnetic compatibility, restricted substances (RoHS), recycling (WEEE), FCC, CE or UL, and therefore may not meet the
technical requirements of these directives or other related directives.
Should this evaluation board/kit not meet the specifications indicated in the User’s Guide, the board/kit may be returned within 30
days from the date of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY
SELLER TO BUYER AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING
ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE.
The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user indemnifies TI from all
claims arising from the handling or use of the goods. Due to the open construction of the product, it is the user’s responsibility to
take any and all appropriate precautions with regard to electrostatic discharge.
EXCEPT TO THE EXTENT OF THE INDEMNITY SET FORTH ABOVE, NEITHER PARTY SHALL BE LIABLE TO THE OTHER
FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES.
TI currently deals with a variety of customers for products, and therefore our arrangement with the user is not exclusive.
TI assumes no liability for applications assistance, customer product design, software performance, or infringement of
patents or services described herein.
Please read the User’s Guide and, specifically, the Warnings and Restrictions notice in the User’s Guide prior to handling the
product. This notice contains important safety information about temperatures and voltages. For additional information on TI’s
environmental and/or safety programs, please contact the TI application engineer or visit www.ti.com/esh.
No license is granted under any patent right or other intellectual property right of TI covering or relating to any machine, process, or
combination in which such TI products or services might be or are used.
FCC Warning
This evaluation board/kit is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION, OR EVALUATION
PURPOSES ONLY and is not considered by TI to be a finished end-product fit for general consumer use. It generates, uses, and
can radiate radio frequency energy and has not been tested for compliance with the limits of computing devices pursuant to part 15
of FCC rules, which are designed to provide reasonable protection against radio frequency interference. Operation of this
equipment in other environments may cause interference with radio communications, in which case the user at his own expense
will be required to take whatever measures may be required to correct this interference.
EVM Warnings and Restrictions
It is important to operate this EVM within the input voltage range of +3.3V to +5V and the output voltage range of 0V to 5V.
Exceeding the specified input range may cause unexpected operation and/or irreversible damage to the EVM. If there are
questions concerning the input range, please contact a TI field representative prior to connecting the input power.
Applying loads outside of the specified output range may result in unintended operation and/or possible permanent damage to the
EVM. Please consult the EVM User's Guide prior to connecting any load to the EVM output. If there is uncertainty as to the load
specification, please contact a TI field representative.
During normal operation, some circuit components may have case temperatures greater than +35°C. The EVM is designed to
operate properly with certain components above +35°C as long as the input and output ranges are maintained. These components
include but are not limited to linear regulators, switching transistors, pass transistors, and current sense resistors. These types of
devices can be identified using the EVM schematic located in the EVM User's Guide. When placing measurement probes near
these devices during operation, please be aware that these devices may be very warm to the touch.
Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265
Copyright © 2010, Texas Instruments Incorporated
IMPORTANT NOTICE
Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements,
and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should
obtain the latest relevant information before placing orders and should verify that such information is current and complete. All products are
sold subject to TI’s terms and conditions of sale supplied at the time of order acknowledgment.
TI warrants performance of its hardware products to the specifications applicable at the time of sale in accordance with TI’s standard
warranty. Testing and other quality control techniques are used to the extent TI deems necessary to support this warranty. Except where
mandated by government requirements, testing of all parameters of each product is not necessarily performed.
TI assumes no liability for applications assistance or customer product design. Customers are responsible for their products and
applications using TI components. To minimize the risks associated with customer products and applications, customers should provide
adequate design and operating safeguards.
TI does not warrant or represent that any license, either express or implied, is granted under any TI patent right, copyright, mask work right,
or other TI intellectual property right relating to any combination, machine, or process in which TI products or services are used. Information
published by TI regarding third-party products or services does not constitute a license from TI to use such products or services or a
warranty or endorsement thereof. Use of such information may require a license from a third party under the patents or other intellectual
property of the third party, or a license from TI under the patents or other intellectual property of TI.
Reproduction of TI information in TI data books or data sheets is permissible only if reproduction is without alteration and is accompanied
by all associated warranties, conditions, limitations, and notices. Reproduction of this information with alteration is an unfair and deceptive
business practice. TI is not responsible or liable for such altered documentation. Information of third parties may be subject to additional
restrictions.
Resale of TI products or services with statements different from or beyond the parameters stated by TI for that product or service voids all
express and any implied warranties for the associated TI product or service and is an unfair and deceptive business practice. TI is not
responsible or liable for any such statements.
TI products are not authorized for use in safety-critical applications (such as life support) where a failure of the TI product would reasonably
be expected to cause severe personal injury or death, unless officers of the parties have executed an agreement specifically governing
such use. Buyers represent that they have all necessary expertise in the safety and regulatory ramifications of their applications, and
acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements concerning their products
and any use of TI products in such safety-critical applications, notwithstanding any applications-related information or support that may be
provided by TI. Further, Buyers must fully indemnify TI and its representatives against any damages arising out of the use of TI products in
such safety-critical applications.
TI products are neither designed nor intended for use in military/aerospace applications or environments unless the TI products are
specifically designated by TI as military-grade or "enhanced plastic." Only products designated by TI as military-grade meet military
specifications. Buyers acknowledge and agree that any such use of TI products which TI has not designated as military-grade is solely at
the Buyer's risk, and that they are solely responsible for compliance with all legal and regulatory requirements in connection with such use.
TI products are neither designed nor intended for use in automotive applications or environments unless the specific TI products are
designated by TI as compliant with ISO/TS 16949 requirements. Buyers acknowledge and agree that, if they use any non-designated
products in automotive applications, TI will not be responsible for any failure to meet such requirements.
Following are URLs where you can obtain information on other Texas Instruments products and application solutions:
Products
Applications
Amplifiers
amplifier.ti.com
Audio
www.ti.com/audio
Data Converters
dataconverter.ti.com
Automotive
www.ti.com/automotive
DLP® Products
www.dlp.com
Communications and
Telecom
www.ti.com/communications
DSP
dsp.ti.com
Computers and
Peripherals
www.ti.com/computers
Clocks and Timers
www.ti.com/clocks
Consumer Electronics
www.ti.com/consumer-apps
Interface
interface.ti.com
Energy
www.ti.com/energy
Logic
logic.ti.com
Industrial
www.ti.com/industrial
Power Mgmt
power.ti.com
Medical
www.ti.com/medical
Microcontrollers
microcontroller.ti.com
Security
www.ti.com/security
RFID
www.ti-rfid.com
Space, Avionics &
Defense
www.ti.com/space-avionics-defense
RF/IF and ZigBee® Solutions www.ti.com/lprf
Video and Imaging
www.ti.com/video
Wireless
www.ti.com/wireless-apps
Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265
Copyright © 2010, Texas Instruments Incorporated
Was this manual useful for you? yes no
Thank you for your participation!

* Your assessment is very important for improving the work of artificial intelligence, which forms the content of this project

Download PDF

advertising