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DEMO MANUAL DC2294A
DESCRIPTION
Power System Management
Linduino One Shield
The DC2294A Linduino™ Shield is an adapter board enabling
use of Linduino PSM (Power System Management) soft-
ware with off the shelf Linear Technology PSM demonstra-
tion boards. For a complete list of compatible demo boards,
click this link: http://www.linear.com/search/search.
php?q=dc&col=doc-dm&start=&sort=&order=&ci=1800.
Linduino PSM software is a set of libraries meant to facilitate
learning and software development for PMBus devices. The
portability and flexibility of the Linduino platform makes
it ideal for demonstrating a wide variety of applications.
Linduino is an Arduino compatible board with an isolated
I2C interface and a ribbon connector that supports com-
munication with many LT C
®
demonstration circuit boards.
The DC2294A Linduino Shield extends this capability to
the PSM demonstration circuits. For more information
on Linduino, see:
http://www.linear.com/solutions/linduino
PROGRAMMING: REQUIRED HARDWARE
Varies based on application, but in general:
n Arduino Software Supported PC with USB
n Linduino One (DC2026A)
n USB cable
PROGRAMMING: REQUIRED SOFTWARE
n Arduino IDE
n LTC Linduino Sketchbook (http://www.linear.com/so-
lutions/Linduino) – See the QuickStart Tab
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
Linduino is a trademark of Linear Technology Corporation. All other trademarks are the property
of their respective owners.
DEMONSTRATION: REQUIRED HARDWARE
Varies based on application, but in general:
n DC2026 Linduino One
n DC2294A Linduino Shield
n Target Demo Board (DC1962, etc.)
DEMONSTRATION: NICE TO HAVE
n Total Phase Beagle I2C Protocol Analyzer
n Total Phase Data Center Software
For this getting started manual, we will use the DC1962.
The DC1962 demo board has 14 power supply rails:
2XLTC3880, 4X LTC2974 and 8X LTC2977.
SHIELD FEATURES
n 12 Pin PSM Ribbon Cable Connector
n 10 Pin Total Phase Beagle Connector
n LTC4313 Bus Buffer
n Observe PMBus and SPI with a Beagle
LINDUINO PSM FEATURES
n A Library of Common PMBus Commands that Sup-
ports the Most Recent PMBus Features, Including
Group Protocol and Page Plus
n Demonstration Sketches for the Linduino
Design files for this circuit board are available at
http://www.linear.com/demo/DC2294A
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FIRST STEPS
Figure 1. DC1962 (top), DC2026/DC2294A (middle) and Beagle (bottom). DC1962 and Beagle not included with DC2294A.
The DC1962 sketches are the starting point for becoming
familiar with the PMBus library.
1. Make sure the Arduino preferences point to the cor-
rect Sketchbook as described in the Linduino Demo
Manual. http://www.linear.com/solutions/linduino.
2. Be sure to complete the setup described on pages4/5
of the Linduino Demo Manual to verify the proper
setup and operation of the serial port and the monitor
before proceeding.
3. Place the DC2294A Linduino Shield on the DC2026
Linduino. All the pins should go into the corresponding
sockets. Refer to Figure 1 for the correct orientation.
4. Connect the PC to the DC2026 using the supplied USB
cable.
5. Plug one end of the 12-pin ribbon cable into the cor-
responding 12-pin connector (J2) of the DC1962.
Plug the other end into the 12-pin connector of the
DC2294A Linduino Shield.
6. In the Arduino IDE File menu, select: Sketchbook |User
Contributed | DC1962 | hello_world.
7. Select the Serial port: Tools | Serial Port | COM#.
8. Select the board: Tools | Board | Arduino Uno.
9. In the Arduino IDE File menu, upload the sketch to the
Linduino: File | Upload.
10. Open the Serial Monitor to begin the demo: Tools|Se-
rial Monitor.
11. Set the baud rate to 115200 at the bottom right of the
window.
12. Set the termination to Carriage Return to the left of
the baud rate.
13. If you have a Total Phase Beagle sniffing tool, attach
it and observe the I2C/PMBus traffic produced by
thisdemo.
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HELLO_WORLD SKETCH
The hello_world sketch demonstrates how to perform
basic PMBus commands. Upload the sketch and then
open the Serial Monitor (Refer to Page 2, Steps 6 and 7).
The main menu (Figure 2) demonstrates enabling/disabling
Packet Error Checking (PEC) communication, bus prob-
ing, and resetting the device. The Basic Commands menu
(Figure 3) demonstrates reading telemetry data (Figure4),
altering voltage outputs, sequencing, and margining.
To operate the menu, enter a number on the command
line at the top of the window and press return. Stretching
the window vertically to see the results will help.
The hello_world sketch can be used as a template for new
sketches. Any standard PSM demo board may be used.
VIEWING PMBUS WITH THE BEAGLE
To observe PMBus traffic on the I2C bus, connect a Beagle
to the DC2294A as shown in Figure 1 and follow these steps:
1. Download the latest TotalPhase Data Center Software
and USB drivers from http://www.totalphase.com/
downloads/ and install them using the instructions
supplied by Total Phase. If you do not want to create
a Total Phase login and account, you can use an older
version of Data Center and USB driver.
2. Connect the PC to the Beagle with the supplied
USBcable.
DEMO SKETCH – DC1962 (POWERSTICK)
3. Start Data Center, Connect Data Center to the Beagle
using the toolbar and start data collection with the
toolbar (refer to Beagle documentation).
4. Load the hello_world sketch and press 1 to get the
secondary menu, followed by a 1 to measure voltage
telemetry.
5. Look at the results in the Data Center menu.
6. Compare the PMBus traffic displayed in Data Center
with the code in the hello_world sketch and correlate
the observed behavior with the PMBus commands in
the code.
SUMMARY
The DC2026 Linduino, and DC2294A Linduino Shield, when
combined with a DC1962 demo board is an excellent way to
learn PMBus and prototype firmware in a safe environment
where nothing can be damaged. The PMBus library may
be ported into a commercial platform, or in some cases it
can be reused “as is” using the same ATmega processor
found on the Linduino. The software is fully compatible
with Arduino One and Arduino Mega 2560. The software
has also been used on a Galileo Gen 2 (see factory).
Linear Technology also has drivers for Linux (usermode)
and various RTOS application examples (see factory).
Have fun prototyping and if you need help, just call your
local Linear Technology Field Application Engineer. If
you make something cool and want to contribute to the
Linduino Sketchbook, also give us a call.
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Figure 3. Basic Commands
Figure 2. Main Menu
DEMO SKETCH – DC1962C (POWERSTICK)
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Figure 4. Read All Voltages
DEMO SKETCH – DC1962C (POWERSTICK)
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PARTS LIST
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
1 1 C35 CAP CER, 0.1μF 16V 5% X7R 0603 MURATA, GRM188R71C104JA01D
2 4 R62, R63, R64, R65 RES 20kΩ 1/10W 1% 0603 SMD PANASONIC, ERJ-3EKF2002V
3 1 JP1 CONN HEADER LOW-PRO 10POS GOLD ASSMANN WSW COMPONENTS, AWHW-10G-0202-T
4 1 J2 CONN HEADER 12POS 2mm STR DL PCB FCI, 98414-G06-12ULF 4 TBS
5 1 U29 2-WIRE BUS BUFFERS WITH HIGH NOISE MARGIN LINEAR, LTC4313IMS8-2#PBF
6 1 JP2 HEADER CONN 28POS 0.100" STR TIN MOLEX, 90131-0134
7 1 J1-A HEADER CONN 6POS 0.100" STR TIN 782-A000084
8 2 J1-B HEADER CONN 8POS 0.100" STR TIN 782-A000085
9 1 J1-C HEADER CONN 10POS 0.100" STR TIN 782-A000086
10 1 J1-D HEADER CONN 6POS(2X3) 0.100" STR TIN CON3DIL25
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Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa-
tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.
SCHEMATIC DIAGRAM
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Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com
LINEAR TECHNOLOGY CORPORATION 2015
LT 0115 • PRINTED IN USA
DEMONSTRATION BOARD IMPORTANT NOTICE
Linear Technology Corporation (LTC) provides the enclosed product(s) under the following AS IS conditions:
This demonstration board (DEMO BOARD) kit being sold or provided by Linear Technology is intended for use for ENGINEERING DEVELOPMENT
OR EVALUATION PURPOSES ONLY and is not provided by LTC for commercial use. As such, the DEMO BOARD herein may not be complete
in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including but not limited to product safety
measures typically found in finished commercial goods. As a prototype, this product does not fall within the scope of the European Union
directive on electromagnetic compatibility and therefore may or may not meet the technical requirements of the directive, or other regulations.
If this evaluation kit does not meet the specifications recited in the DEMO BOARD manual the 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 THE SELLER TO BUYER AND IS IN LIEU
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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
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agency certified (FCC, UL, CE, etc.).
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customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind.
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Please read the DEMO BOARD manual prior to handling the product. Persons handling this product must have electronics training and
observe good laboratory practice standards. Common sense is encouraged.
This notice contains important safety information about temperatures and voltages. For further safety concerns, please contact a LTC application
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