MAX11645
2-CHANNEL
12-BIT ADC
MAXQ622
CONTROLLER
MAX8511
LDO
FT2232HL
USB
CONTROLLER
MAX1556
DC-DC
Windows PC
ADCLITE2
ANALOG SIGNAL
CAPTURE
GUI
REFDES24
4-CHANNEL
ANALOG
OUTPUT
GUI
MAXADCLITE2
USB2PMB1
20–30VDC
(>150mA)
MAX5134
4-CHANNEL
16-BIT DAC
MAX15500
SIGNAL CONDITIONERS
MAX14850
DIGITAL
ISOLATOR
MAX6126 VREF
MAX17498
FLYBACK
CONTROL
MAX1659
LDO
MAXREFDES24
0–10V
0–5V
±10V
0–20mA
±20mA
SPI
USB
USB
CONTROL AND
DIAGNOSTICS
MEASUREMENT
MAXREFDES24EVSYS
User Manual
Rev 0; 11/14
For pricing, del ivery , and or der ing info r mation, p lea se co nta ct M axim D irect at 1-888-629-4642, or visit M ax im Inte grat ed’s webs i te at w ww . maximintegra ted .com .
Maxim Integrate d cannot a ssume res ponsibi lity f or use of a ny circui try oth er than circuitry entirel y emb odied in a Maxim I ntegrate d product. No circuit
patent licenses are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time.
© 2014 Maxim Integrated Products, Inc. Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc.
MAXREFDES24EVSYS User Manual
Table of Contents
1 Introduction ......................................................................................................................................... 3
1.1 O rder ing Inf ormation .................................................................................................................. 3
1.2 Package Contents...................................................................................................................... 3
1.3 PC System Requirements ......................................................................................................... 4
1.4 Functional Diagram .................................................................................................................... 4
1.5 Quick Start Instructions .............................................................................................................. 4
2 Software Description .......................................................................................................................... 5
3 Hardware Connections ....................................................................................................................... 6
3.1 USB2PMB1 to MAXREFDES24 ................................................................................................ 6
3.2 24VDC to MAXREFDES24 ........................................................................................................ 6
3.3 USB2PMB1 to PC ...................................................................................................................... 7
3.4 MAXADCLITE2 to PC ................................................................................................................ 7
3.5 Analog Signal Connections ........................................................................................................ 8
4 Graphical User Interfaces ................................................................................................................... 9
4.1 GUI for MAXREFDES24 ............................................................................................................ 9
4.1.1 USB2PMB Adapter .......................................................................................................... 9
4.1.2 MAX15500 Output Conditioners .................................................................................... 11
4.1.3 MAX5134 DAC (Code Generator) ................................................................................. 13
4.2 GUI for MAXADCLITE2 ........................................................................................................... 14
4.2.1 Scope Options ................................................................................................................ 14
5 Hardware Description ....................................................................................................................... 15
5.1 MAXREFDES24 ....................................................................................................................... 15
5.2 MAXADCLITE2 ........................................................................................................................ 15
5.3 USB2PMB1 .............................................................................................................................. 15
6 Contact Information .......................................................................................................................... 16
7 Trademarks ........................................................................................................................................ 16
8 Revision History ................................................................................................................................ 17
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MAXREFDES24EVSYS User Manual
1 Introduction
The MAXREFDES24EVSYS design accelerator kit allows users to quickly demonstrate and evaluate the
functionality of Maxim Integrated’s 4-channel analog output (AO) r eference design (MAXREFDES24
the need for a bench power suppl y, digital multimeter , or Xilinx de velopment kit. The reference board connects
to a PC through an included USB-to-SPI adapter (
A universal power adapter is included for providing 24V DC power.
To exercise the AO reference design, a USB-powered signal capture board (MAXADCLITE2) utilizing one of
Maxim Integrated’s 12-bit analog-to-digital c onverters (ADCs) is also included. The sim ple tool provides two
inputs capable of m easuring unipolar analog control signals up to 10V (or 20mA with selectable term ination
resistor).
Windows®-based grap hical user interf aces (GUIs) c ommunicate with the boards for generat ing and ca pturing
various signal test patterns. An intuitive alarm interface is also provided for demonstrating the digital
diagnostics capabilities of the MAX15500 output conditioners.
USB2PMB1) tha t pr o vides dat a c om m unicatio n to the board.
1.1 Ordering Information
) without
PART
MAXREFDES24EVSYS# Bundled kit for PC evaluation of MAXREFDES24
#Denotes a RoHS-compliant device that may include lead that is exempt under the RoHS requirements.
DESCRIPTION
1.2 Package Contents
The MAXREFDES24EVSYS kit includes the following:
• MAXREFDES24 r ef er enc e desig n board (Pmod
• Universal 24VDC power supply with international plugs and test clip adapter
• USB2PMB1 USB-to-Pmod Type 2A adapter board
• USB-powered MAXADCLITE2 signal capture board
• Two (2) USB type-A male to USB type-B mini cables
• Two (2) wires with hook clips (1 red and 1 black)
• USB flash drive with documentation and GUI applications
• Quick Start Guide (print copy)
TM
compatible)
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MAXREFDES24EVSYS User Manual
MAX11645
2-CHANNEL
12-BIT ADC
MAXQ622
CONTROLLER
MAX8511
LDO
FT2232HL
USB
CONTROLLER
MAX1556
DC-DC
Windows PC
ADCLITE2
ANALOG SIGNAL
CAPTURE
GUI
REFDES24
4-CHANNEL
ANALOG
OUTPUT
GUI
MAXADCLITE2
USB2PMB1
20–30VDC
(>150mA)
MAX5134
4-CHANNEL
16-BIT DAC
MAX15500
SIGNAL CONDITIONERS
MAX14850 DIGITAL
ISOLATOR
MAX6126 VREF
MAX17498
FLYBACK CONTROL
MAX1659
LDO
MAXREFDES24
0–10V
0–5V
±10V*
0–20mA
±20mA*
SPI
USB
USB
CONTROL AND
DIAGNOSTICS
MEASUREMENT
*BIPOLAR MODES NOT COMPATIBLE WITH MAXADCLITE2
HARDWARE.
1.3 PC System Requirements
The MAXREFDES24EVSYS kit requires the use of a PC with the following:
• Minimum 1GHz processor and 1GB RAM
• Minimum 1024 x 768 video display resolution
• Two available USB ports
• Microsoft Windows 8, Windows 7, Windows Vista®, or Windows XP®
1.4 Functional Diagram
1.5 Quick Start Instructio n s
1) Copy USB flash drive contents to PC (if only two USB ports available).
2) Connect USB2PMB1 to MAXREFDES24 as shown.
3) Plug 24VDC adapter into AC source and MAXREFDES24.
4) Connect USB cables to USB2PMB1 and MAXADCLITE2.
5) Use test clips to connect output of MAXREFDES24 to input of MAXADCLITE2.
6) Launch GUIs.
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MAXREFDES24EVSYS User Manual
2 Software Description
There are two Windows G UI applications inc luded with MAXREFDES24EVSYS that can be executed direc tly
from the USB flash drive after USB connections have been established with the boards and Windows
completes driver installation. See the Graphical User Interfaces
• 4-Channel Analog Output GUI utilizes the U SB2PMB1 adapter for exercising the di gital interface of
the MAXREFDES24 desig n. This includes the SP I port of the MAX5134 4-chan nel DAC and multiple
MAX15500 output conditioners. This GUI application utilizes the .NET 4.0 platform and does not
require installation of any Maxim Integrated software.
• MAXADCLite2 GUI for capturing analog test signals with the MAXADCLITE2 board in order to
evaluate the performance of the AO reference design. This application does not require installation.
If only two (2) USB por ts are available, cop y the USB flash dri ve contents directly to your local har d drive or
download the USB flash drive contents from www.maximintegrated.com/MAXREFDES24
section for screenshots and user information.
.
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MAXREFDES24EVSYS User Manual
3 Hardware Connections
This section describes the basic connections with the MAXREFDES24EVSYS kit.
• The user must pr ovide a Windows PC with two available USB ports and an AC outlet for operating the
MAXREFDES24EVSYS kit. In addition to providing PC communications, the USB ports power the
USB2PMB1 and MAXADCLITE2 boards.
• A universal AC wall adapter and test clip adapter are includ ed for providing 24V DC to the MAXREFDES24
analog output board. A ny DC supply with 20–30V DC and >150mA output capabilit ies can be substitute d
for the AC wall adapter.
• The MAXREF DES24 and USB2PMB1 boards m ate together via a 12-pin Pmod Type 2A connector. For
more information on the Pmod form factor, refer to the Digilent Pmod
www.DigilentInc.com.
• A pair of wires with test clips is provided for establishing an analog control signal between one of the
MAXREFDES24 outputs and one of the MAXADCLITE2 inputs.
TM
Interface Specification or visit
3.1 USB2PMB1 to MAXREFDES24
Connect the MAXREFDES24 board to the USB2PMB1 adapter as shown above. Both 12-pin connectors
should be on the same side of the PCB when mated together.
3.2 24VDC to MAXREFDES24
Connect the color c oded test clips of the DC po wer adapter to the M AXREFDES24 board as shown a bove.
Red clips connect to +24V and black clips connect to PGND.
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MAXREFDES24EVSYS User Manual
3.3 USB2PMB1 to PC
Connect one of the USB cables between the USB2PMB1 board and PC. The USB2PMB1 adapter board
includes an FTDI FT2232H L USB controller IC that perf orms the USB functions and conver sion to SPI. Upon
attaching the USB2PMB1 adapter board to the PC, t he Found New Hardware Wizard autom aticall y launches
and installs the appropriate driver files. Multiple drivers will be installed before it is ready to use. To verify
proper installation, one should see two USB Serial Converters (A and B) in the Device Manager as shown
below.
If your PC does not find the FTDI driver files on the local hard disk drive, locate and reference the
\USB2PMB1\Drivers\ subdirectory on the USB flash drive to install FTDI’s D2XX driver.
3.4 MAXADCLITE2 to PC
Connect one of the provide d USB cables betwee n the MAXADCLIT E2 board and PC. T he on-board contr oller
presents itself to the PC as a USB HID class device in the W indows Device Manager as shown be low and
does not require any third-party drivers.
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MAXREFDES24EVSYS User Manual
0
1
J
4
J9
JU3
JU1
JU7
JU5
JU
2
JU4
JU6
JU
8
OUT1
OUT
2
OUT3
OUT4
1
2
3
1 2 3
AIN0
AIN1
GND
MAXREFDES24
MAXADCLITE2
MAX15500 OVERRANGE
CONTROL
0–20mA + 5%
-140µA to 21mA
20mA + 5%
-21mA to 21mA
0-20mA + 20%
-150µA to 24mA
20mA + 20%
0–10V + 20%
-0.63V to 12.16V
10V + 20%
-12.28V to 12.28V
3.5 Analog Signal Connections
The diagram below sh ows an ex ample co nnection between an analog o utput (O UT1) on MAXREFDE S24 and
an analog input (AIN0) on MAXAD CLITE2 along with the gr ound connect ion between the two analog gr ounds
(AGND). All analog grounds are tied together on MAXREFDES24.
The jumpers shown ab ove for the MAXREFDES24 selec t between 5% (default) and 20% overrange modes
while the jumpers shown for MAXADCLITE2 s elect the on-boar d termination re sistor for testing cur rent loops.
The following table sum m arizes the analog output signal ranges for the MAXREF DES24 design along with th e
required hardware jumper settings. See the Graphical User Interfaces
section for all other mode controls.
MAXADCLITE2
±
±
0–5V + 5% -0.28V to 5.36V
0–10V + 5% -0.56V to 10.71V
0–5V + 20% -0.31V to 6.08V
±
Note the output range of the MAXREFDES24 analog outputs exceeds the input range capabilities of the
OUTPUT SIGNAL
RANGE
-24mA to 24mA
FSMODE
(JU1, JU2,
JU3, JU4)
Don’t Care
Jumper 1:2
Jumper 2:3
SENSER
(JU2, JU4,
JU6, JU8)
Jumper 2:3
Jumper 1:2
Don’t Care
AIN
TERMINATION
(J4, J9)
Jumper Closed
(500Ω Load)
Jumper Open
(1kΩ Load)
MAXADCLITE2 board, which only supports unipolar signals u p to 10V or 20m A. Signals outside of this range
will be clamped by on-board protection diodes.
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MAXREFDES24EVSYS User Manual
USB
MAX15500
MAX5134
4 Graphical User Interfaces
Before launching the G UI applicati ons, mak e sure the USB2P MB1 and MAXADCLITE2 boards are connect ed
to the PC as described in the previous section.
4.1 GUI for MAXREFDES24
With the USB2PMB1 board connected, run (double-click) the 4-Ch_Analog_Output.exe file located in the
\MAXREFDES24\ directory of the USB flas h drive. Once the GUI window appears, only the USB connectivity
section will be active. T he other two sections for the analog s ignal chain com ponents are gr ayed out until t he
USB connection is established
CONNECTIVITY
OUTPUT
CONDITIONER
DAC CODE
GENERATION
CONFIGURATION
AND STATUS
4.1.1 USB2PMB Adapter
USB connectivity is managed in the USB Adapter section located in the upper left-hand corner of the
application. Click Scan Adapters to discov er any compatible USB2PMB devices (starting w ith PMOD). If no
adapters are found, the GUI of fers the user the abilit y to enter into a “Demo GUI” mode where the user can
exercise the features of the G UI without communicatin g to any hardware. Cl ick on Connect once the adapter
starting with PMODxxxxxxx appears.
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MAXREFDES24EVSYS User Manual
If you see this pop-up
Connection Troubleshooting:
screen after clicking Scan
Adapters, check USB
connection to the PC and
USB2PMB1 adapter.
Also confirm drivers are
installed in Windows
Device Manager.
Click No and try scanning
for adapters again. Click
Yes to proceed launching
the GUI in a demo mode.
If you see this pop-up
after clicking Connect,
make sure the J1
connector of the
MAXREFDES24 board is
connected to
USB2PMB1.
Also make sure 24VDC is
applied to the
MAXREFDES24 board.
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MAXREFDES24EVSYS User Manual
4.1.2 MAX15500 Output Conditioners
Following USB connection, the MAX15500 Output Conditioners section will refresh to show the default
configuration and initial error states of the MAX1550 devices. Upon any power-up (or supply brownout
condition), the Supply Brownout alarm is expected. A red LED on the MAXR EFDES24 hard ware will also be
on. A subsequent Refresh of the MAX15500 Output Conditioners section will clear the alarm.
One can set the Brownout threshold in 2V inc rements from ±10V to ±24V. In the MAXREFDES24 desig n, a
brownout threshold of ±24V triggers a Supply Brownout alarm.
The default mode upon power up for the analog outputs is Standby with a ±10V brownout threshold and
thermal protection disabled. Use the Configuration sections to configure the on-board MAX15500 signal
conditioners to output com mon industrial control signal ranges (current or volta ge) and to read back any error
conditions the MAX15500 report.
• Use the Refresh button to read and refres h the Configuration and Error(s) status of the MAX1550 0
devices.
• Use the Apply button to write the displayed configuration to the MAX155 00 devices. Enable Refresh
On Apply to immediately issue a read or Refresh command following a write or Apply.
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MAXREFDES24EVSYS User Manual
Common error states and their meanin g are summ arized below . Refer to the MAX15500 IC data sheet for f ull
details on the error detection capabilities and register behavior.
When operating in voltage
modes, the Short Circuit error is
asserted if the respective output
is shorted to analog ground.
If the short circuit condition has
been resolved, a subsequent
Refresh asserts both the
Intermittent Fault and Short Circuit
errors. A second Refresh clears
the error unless the short circuit
condition has returned.
If the short circuit condition
remains, the error remains
asserted as shown above.
When operating in current
modes, the Open Load error is
asserted if there is an open
circuit in the current loop for the
respective output.
If the open load condition has
been resolved, a subsequent
Refresh asserts both the
Intermittent Fault and Open Load
errors. A second Refresh clears
the error unless the open load
condition has returned.
If the open load condition
remains, the error remains
asserted as shown above.
If the Intermittent Fault error is
ever asserted, one or more of the
other asserted error conditions
has cleared before the user read
the status register.
A subsequent Refresh clears the
intermittent errors and leaves any
persistent error alarms asserted.
Rev 0 12
DAC device (when
for more
4.1.3 MAX5134 DAC (Code Generator)
The M AX5134 D AC c ontrol section allo ws users to send a s ingle DAC
value for a DC output or to pick from a few basic waveforms. Signal
levels are set in DA C codes (range of 0 to 65535) a nd are sent to all
four DAC outputs. See the table in the Analog Signal Connections
section for respective output signal levels.
Note that the USB overhead encountered in the USB2PMB1 board
(through use of FTDI chipset’s software device driver) will throttle
throughput from the PC to the MAX5134 quadgenerating waveform signals) to approximately 2.6K DAC sampling
points per second. Refer to
information on performance results for the DAC and MAXREFDES24
reference design using a Xilinx development kit.
MAXREFDES24EVSYS User Manual
Reference Schematic 5839
Rev 0 13
MAXREFDES24EVSYS User Manual
4.2 GUI for MAXADCLITE2
With the MAXADCLITE2 board connected, run (double-click) the MAXADCLite2.exe file located in
the \MAXADCLITE2\ directory. The application runs in a continuous sampling mode at a sampling rate of
1ksps. The onl y user control is selecting the input channel (default AIN 0). The ADCLite2 is basic and simple
way to quickly look at the MAXREFDES24 output waveforms. For more information on the MAX11645 and
other evaluation kits, go to www.maximintegrated.com/MAX11645
.
4.2.1 Scope Options
Holding the mouse cursor over the top right corner of the Scope or the Histogram plot displays the plot
settings options avail able to the user, whic h include play/paus e, zoom in/out, pan, pri nt, save, and waveform
settings.
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MAXREFDES24EVSYS User Manual
Bill of Materials
Schematics (PDF)
Layout (PDF)
5 Hardware Description
This section provides more information on the hard ware design of the three board s includ ing schematics, bill of
materials, and PCB layout files.
5.1 MAXREFDES24
The MAXREFDES24 reference design is a 4-channel analog output (AO) subsystem that generates controlled
voltages or current loop si gnals using four (4) out put conditioners (MAX15500
(MAX5134). For maximum performance, an ultra-high precision 4.096V voltage reference (MAX6126) is
included. A 600V
provide the necessary isolated data and power connections to the analog sub-system.
Reference Schematic 5839
performance test res ults of the reference design when used with a X ilinx development system. Refer to this
online document for links to the latest hardware design files, test results, relevant application notes, and project
files for select Xilinx d evelopm ent kits. Below is a summ ary of the hard ware design files available on t he USB
flash drive for the MAXREF D ES24 des ig n.
digital isolator (MAX14850), power transformer, and flyback controller (MAX17498)
RMS
provides more information on the MAXREFDES24 design and includes
USB Flash Drive
PCB Source Files
Layout (Gerber)
5.2 MAXADCLITE2
) and a 4-channel 16-bit DAC
The MAXADCLite2 board utilizes a low-power, 2-channel, 12-bit ADC (MAX11645) with a n input circuit that
offers basic input protection, selectable current loop termination (jumpers J 4, J9), and a divide-by-5 resistor
ladder for scaling analog si gnals (up to 10V) to levels compatib le with the ADC’s 2.048V internal ref erence. A
microcontroller (MAXQ622
bus. The described l imitations are r eflected b y the suffix “ Lite” in the name of the board. For m ore inform ation
on the MAX11645 and full evaluation kits, go to
.
) provides bridge functionality between a USB HID interface and I2C-compatible
www.maximintegrated.com/MAX11645.
5.3 USB2PMB1
The USB2PMB1 boar d uses the FT2232HL , a USB 2.0 high-speed (480Mbps) to UART/FIFO IC, to proces s
commands sent by a GUI application running on the PC. The design integrates a 4K MICROWIRE®compatible serial EEPROM (93LC66BT) and a low-power, 1.2A, PWM step-down DC-DC converter
(MAX1556
4K MICROWIRE EEPROM, and to the 12-pin connector for 3.3V Pmod Type 2A-compatible boar ds.
For more inform ation on the USB2PM B1 hardware design or oth er compatible b oards fr om Maxim Integrated,
go to www.maximintegrated.com/USB2PMB1
Digilent Pm odTM Interface Specification or visit www.DigilentInc.com.
) for generating 3.3V (VCCIO) from the 5V USB supply. VCCIO provides power to the FTDI chip, the
. For more information on the Pmod form factor, refer to the
Rev 0 15
MAXREFDES24EVSYS User Manual
6 Contact Information
For more information about Maxim Integrated products, contact technical support at
www.maximintegrated.com/support
.
7 Trademarks
MICROWIRE is a registered trademark of National Semiconductor Corp.
Pmod is a trademark Digilent Inc.
Windows is a registered trademark and registered service mark and Windows Vista and Windows XP are
registered trademarks of Microsoft Corporation.
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MAXREFDES24EVSYS User Manual
8 Revision History
REVISION
NUMBER
0 11/14 Initial release
REVISION
DATE
DESCRIPTION
PAGES
CHANGED
—
Rev 0 17
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