Analog Devices EV-AD74412RSDZ User manual

EV-AD74412RSDZ User Guide
UG-1634
One Technology Way •P. O. Box 9106 •Norwood, MA 02062-9106, U.S.A. •Tel: [phone] •Fax: [phone] •www.analog.com
Evaluating the AD74412R Quad-Channel, Software Configurable Input/Output
PLEASE SEE THE LAST PAGE FOR AN IMPORTANT
WARNING AND LEGAL TERMS AND CONDITIONS. Rev. 0 | Page 1 of 15
FEATURES
Fully featured evaluation board for the AD74412R
On-board 2.5 V ADR4525 reference
SPI
PC-based software for control
EVALUATION KIT CONTENTS
EV-AD74412RSDZ evaluation board
EQUIPMENT NEEDED
EVAL-SDP-CS1Z
Benchtop power supply and connector cables
DOCUMENTS NEEDED
AD74412R data sheet
SOFTWARE NEEDED
AD74412R evaluation software for control
GENERAL DESCRIPTION
The EV-AD74412RSDZ (see Figure 1) is a fully featured
evaluation board that can be used to evaluate the features of the
AD74412R. The AD74412R is a quad-channel, software
configurable, input/output device. The device has functionality
for analog output, analog input, digital input, and resistance
temperature detector (RTD) measurements integrated into a
single-chip solution with a serial peripheral interface (SPI)-
compatible interface.
The EV-AD74412RSDZ can be controlled via a system
demonstration platform (SDP). The EVAL-SDP-CS1Z (SDP-S)
board allows the EV-AD74412RSDZ to be controlled via the
USB port of a PC using the AD74412R evaluation software.
The EVAL- AD74412RSDZ requires an AVDD operating supply
of 14 V to 26.4 V. When the EV-AD74412RSDZ is connected to
the PC, the PC provides power to the SDP-S board.
For full details on the AD74412R, see the AD74412R data sheet,
which must be consulted in conjunction with this user guide
when using the EV-AD74412RSDZ.
EVALUATION BOARD PHOTOGRAPH
21413-001
Figure 1.

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TABLE OF CONTENTS
Features .............................................................................................. 1
Evaluation Kit Contents................................................................... 1
Equipment Needed........................................................................... 1
Documents Needed.......................................................................... 1
Software Needed............................................................................... 1
General Description......................................................................... 1
Evaluation Board Photograph......................................................... 1
Revision History ............................................................................... 2
Evaluation Board Hardware............................................................ 3
Power Supplies .............................................................................. 3
Reference Options ........................................................................ 3
Output Channels .......................................................................... 3
SPI Communication..................................................................... 3
Test Points ......................................................................................3
Link Configuration Options........................................................3
Software Quick Start Procedures ....................................................5
Accessing the AD74412R Evaluation Software Graphical User
Interface (GUI) ..............................................................................5
Configuring the Board .................................................................5
Using the Software for Evaluation...............................................5
Example Sequence.........................................................................8
Evaluation Board Schematics and Artwork...................................9
Ordering Information.................................................................... 14
Bill of Materials........................................................................... 14
REVISION HISTORY
9/2019—Revision 0: Initial Version

EV-AD74412RSDZ User Guide UG-1634
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EVALUATION BOARD HARDWARE
POWER SUPPLIES
The EV-AD74412RSDZ comes with a single power supply
connector that provides power directly to the AVDD pin of the
AD74412R. Set this supply as described in the AD74412R data
sheet.
The AVDD supply on the EV-AD74412RSDZ powers an on-
board regulator (ADP2360), which generates a 5 V supply to the
EV-AD74412RSDZ (see Figure 2). The 5 V supply can be used
for the following purposes:
Power a 2.5 V external reference (ADR4525). The
ADR4525 can be used as an alternative to the AD74412R
on-chip reference.
Power a 3.3 V regulator (ADP1720). The 3.3 V from the
regulator powers the DVCC and IOVDD supplies of the
AD74412R.
Figure 2 shows a simplified drawing of the power connections
on the EV-AD74412RSDZ.
REFERENCE OPTIONS
By default, the EV-AD74412RSDZ is configured to use the
AD74412R on-chip reference by shorting the REFOUT pin to
the REFIN pin. There is also an external reference option
available on the EV-AD74412RSDZ. The ADR4525 can be used
instead of the internal reference. The appropriate jumpers must
be connected if using the external reference. See Table 1 for the
specific link options and functions.
OUTPUT CHANNELS
The four channels of the AD74412R are configured as described
in the AD74412R data sheet. Figure 13 shows the schematic
details for all four channels.
There are four channel screw terminal connectors on the EV-
AD74412RSDZ. These terminals (CH_A, CH_B, CH_C, and
CH_D) are used to connect the desired loads to the four
channels of the AD74412R.
SPI COMMUNICATION
The SDP-S board handles the communication to the EV-
AD74412RSDZ via the PC. By default, the SDP-S board controls
the SPI communication, controls the RESET pin (driven high)
and LDAC pin (driven low), and monitors the ALERT pin,
ADC_RDY pin, and the GPO_x pins of the AD74412R.
A reset button (S1) is also available on the EV-AD74412RSDZ.
The EV-AD74412RSDZ supports the use of an Arduino® board
(such as the EVAL-ADICUP3029) when connected to the
headers provided. See Table 1 for the necessary links to the
Arduino header.
TEST POINTS
Multiple test points are available on the EV-AD74412RSDZ.
Debug access is available for all pins on the AD74412R and on
the four channel screw terminals. The test points are located
adjacent to the relevant pins on the AD74412R.
LINK CONFIGURATION OPTIONS
The JPx and Px jumpers must be set properly for operation of
the EV-AD74412RSDZ before using the EV-AD74412RSDZ. The
functions and default states of these options are listed in Table 1.
Before applying power and signals to the EV-AD74412RSDZ,
ensure that all links are set to the default positions, as defined in
Table 1.
REFOUT REFIN
DVCC AVDD
IOVDD
5V
3.3V
EXTERNAL
REFERENCE (2.5V)
SUPPLY CONNECTOR
14V TO 26.4V
ADP2360
ADP1720
AD74412R
ADR4525
21413-002
Figure 2. EV-AD74412RSDZ Simplified Power Diagram

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Table 1. EV-AD74412RSDZSDZ Link Option Functions
Link Function Default Position
JP1 When inserted, the AVDD supply is used to power the ADP2360. Inserted
JP2 When inserted, 5 V is supplied by the Arduino connector. Not inserted
When not inserted, JP3 can be used to provide the 5 V supply instead.
JP3 When inserted, 5 V is supplied by the ADP2360. Inserted
When not inserted, JP2 can be used to provide the 5 V supply instead.
JP4 When inserted, 5 V is used to power the ADP1720. Inserted
When not inserted, no power is provided to the ADP1720.
JP5 When inserted, the DVCC voltage is supplied by the Arduino connector. Not inserted
When not inserted, JP6 can be used to provide the DVCC supply instead.
JP6 When inserted, the DVCC voltage is supplied by the ADP1720. Inserted
When not inserted, the DVCC supply can be supplied by the Arduino connector instead.
JP7 When inserted the IOVDD voltage is connected to the DVCC voltage. Inserted
When not inserted, no power is applied to the IOVDD pin.
JP8 When inserted, the REFIN pin is tied to the output of the ADR4525. Not inserted
JP9 When inserted, the REFIN pin is tied to the REFOUT pin (the internal reference of the AD74412R). Inserted
JP10 When inserted, 3.3 V is provided by the SDP-S board. Inserted
When not inserted, JP11 can be used to provide the 3.3 V supply instead.
JP11 When inserted, 3.3 V is provided by the Arduino connector. Not inserted
When not inserted, JP10 can be used to provide the 3.3 V supply instead.
JP12 When inserted, the AD74412R reset can be triggered by the Arduino reset function. Not inserted
JP13 When inserted, the AD74412R reset can be provided by the reset button on the EV-AD74412RSDZ. Inserted
JP14 When inserted, the AD74412R reset can be triggered by an Arduino general-purpose input/output (GPIO). Not inserted
JP15 When inserted, the 5 V supply can be used to supply the SDP-S board. Not inserted
P6 Can be used to connect or to bypass the optional P-channel field effect transistor (PFET) for low resistive
loads on Channel A of the AD74412R.
PFET connected
Can be used to connect the AD74412R to the external screw terminal via the external PFET by connecting
Pin 1 to Pin 2, Pin 3 to Pin 4, and Pin 5 to Pin 6.
Can be used to bypass the external PFET by connecting Pin 1 and Pin 3.
P7 Can be used to connect or bypass the optional PFET for low resistive loads on Channel B of the AD74412R. PFET connected
Can be used to connect the AD74412R to the external screw terminal via the external PFET by connecting
Pin 1 to Pin 2, Pin 3 to Pin 4, and Pin 5 to Pin 6.
Can be used to bypass the external PFET by connecting Pin 1 and Pin 3.
P8 Can be used to connect or to bypass the optional PFET for low resistive loads on Channel C of the AD74412R. PFET connected
Can be used to connect the AD74412R to the external screw terminal via the external PFET by connecting
Pin 1 to Pin 2, Pin 3 to Pin 4, and Pin 5 to Pin 6.
Can be used to bypass the external PFET by connecting Pin 1 and Pin 3.
P9 Can be used to connect or to bypass the optional PFET for low resistive loads on Channel D of the AD74412R. PFET connected
Can be used to connect the AD74412R to the external screw terminal via the external PFET by connecting
Pin 1 to Pin 2, Pin 3 to Pin 4, and Pin 5 to Pin 6.
Can be used to bypass the external PFET by connecting Pin 1 and Pin 3.

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SOFTWARE QUICK START PROCEDURES
ACCESSING THE AD74412R EVALUATION
SOFTWARE GRAPHICAL USER INTERFACE (GUI)
The AD74412R evaluation software is used to communicate
with the EV-AD74412RSDZ. To download the software
executable, go to www.analog.com/AD74412R.
CONFIGURING THE BOARD
To set up the EV-AD74412RSDZ, take the following steps:
1. Connect a USB cable to the PC and then to the SDP-S board.
2. Connect the SDP-S board to the EV-AD74412RSDZ. The
PC recognizes the EV-AD74412RSDZ.
3. Power up the EV-AD74412RSDZ with the relevant power
supplies.
4. If not opened already, open the AD74412R evaluation
software GUI. The GUI displays a green indicator to
confirm that the AD74412R is connected (see Figure 3).
5. Click Start to begin configuration.
21413-003
Figure 3. AD74412R Evaluation Software Start Page
USING THE SOFTWARE FOR EVALUATION
Configure Tab
The Configure tab is used to configure the four channels of the
AD74412R. Each channel can be configured as described in the
AD74412R data sheet. The dropdown menus are used to
configure the required use case (see Figure 4).
21413-004
Figure 4. Channel Use Case View
When the use case is selected, the associated advanced settings
display (see Figure 5). The gear icon in the top right corner of
the page allows the user to toggle between the main settings and
the advanced settings.
Click Apply to update the device with the selected settings.
21413-005
Figure 5. Channel Use Case Advanced Settings
View Results Tab
When the channel configuration is applied, click the View
Results tab to see the channel monitor. Results from each
channel are shown in a separate graph (see Figure 6).
Diagnostics Tab
In the Diagnostics tab, click the test points to enable
measurements of the required diagnostics. Up to four
diagnostics can be enabled at once (see Figure 7).