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1 DEMO MANUAL DC2620A-A Rev.B DESCRIPTION LTC7106 A 7-Bit Current DAC with Digital PMBus Interface Demonstration circuit 2620A-A uses the LTC ® 7106, a precision, bidirectional, 7-Bit current DAC with PMBus interface and can be used to adjust the output voltage of any conventional V FB referenced regulator. The LTC7106 can work with the vast majority of power management controllers, regulators or modules to enable digital control of the output voltage. The DC2620A-A requires input voltage range from 2.5V to 5.5V, which can be powered either by external supply or directly from the DC1613A dongle. The LTC7106 pro- vides three ranges of IDAC output current: Nominal Range (–64µA to 63µA), Range High (–256µA to 252µA) and Range Low (–16µA to 15.75µA). Only the nominal range is optimized with the highest accuracy. It is recommended that users design the resistor divider using the nominal range of the IDAC setting. All registered trademarks and trademarks are the property of their respective owners. PERFORMANCE SUMMARY To explore the power system management features of the parts, download the GUI software LTpowerPlay ® onto your PC and use ADI’s I 2 C/SMBus/PMBus Dongle DC1613A to connect to the board. LTpowerPlay allows the user to reconfigure the part on-the-fly, view IDAC current value and fault status. GUI Download The software can be downloaded from: LTpowerPlay For more details and instructions of LTpowerPlay, please refer to LTpowerPlay for LTC7106 Quick Start Guide. Design files for this circuit board are available. Specifications are at T A = 25°C SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS V DD IC Bias Voltage 2.5 5.5 V V IDAC I DAC Operation Voltage 0.4 2.0 V I DAC Output Current Range Nominal, LSB = 1µA –64 63 µA Range High, LSB = 4µA –256 252 µA Range Low, LSB = 0.25µA –16 15.75 µA A CC I DAC Accuracy Nominal Range –1.5 0.8 %

DEMO MANUAL DC2620A-A LTC7106 A 7-Bit Current DAC ......2020/02/18  · 1 DEMO MANUAL DC2620A-A Rev.B DESCRIPTION LTC7106 A 7-Bit Current DAC with Digital PMBus Interface Demonstration

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  • 1

    DEMO MANUAL DC2620A-A

    Rev.B

    DESCRIPTION

    LTC7106 A 7-Bit Current DAC with

    Digital PMBus Interface

    Demonstration circuit 2620A-A uses the LTC®7106, a precision, bidirectional, 7-Bit current DAC with PMBus interface and can be used to adjust the output voltage of any conventional VFB referenced regulator. The LTC7106 can work with the vast majority of power management controllers, regulators or modules to enable digital control of the output voltage.

    The DC2620A-A requires input voltage range from 2.5V to 5.5V, which can be powered either by external supply or directly from the DC1613A dongle. The LTC7106 pro-vides three ranges of IDAC output current: Nominal Range (–64µA to 63µA), Range High (–256µA to 252µA) and Range Low (–16µA to 15.75µA). Only the nominal range is optimized with the highest accuracy. It is recommended that users design the resistor divider using the nominal range of the IDAC setting.

    All registered trademarks and trademarks are the property of their respective owners.

    PERFORMANCE SUMMARY

    To explore the power system management features of the parts, download the GUI software LTpowerPlay® onto your PC and use ADI’s I2C/SMBus/PMBus Dongle DC1613A to connect to the board. LTpowerPlay allows the user to reconfigure the part on-the-fly, view IDAC current value and fault status.

    GUI Download

    The software can be downloaded from:

    LTpowerPlay

    For more details and instructions of LTpowerPlay, please refer to LTpowerPlay for LTC7106 Quick Start Guide.

    Design files for this circuit board are available.

    Specifications are at TA = 25°C

    SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

    VDD IC Bias Voltage 2.5 5.5 V

    VIDAC IDAC Operation Voltage 0.4 2.0 V

    IDAC Output Current Range Nominal, LSB = 1µA –64 63 µA

    Range High, LSB = 4µA –256 252 µA

    Range Low, LSB = 0.25µA –16 15.75 µA

    ACC IDAC Accuracy Nominal Range –1.5 0.8 %

    https://www.analog.com/DC2620A-A?doc=DC2620A-A.pdfhttps://www.analog.com?doc=DC2620A-A.pdfhttps://www.analog.com/LTC7106?doc=DC2620A-A.pdfhttps://www.analog.com/en/design-center/ltpower-play.html?doc=DC2620A-A.pdfhttps://www.analog.com/en/design-center/evaluation-hardware-and-software/evaluation-boards-kits/DC2620A-A.html#eb-documentation?doc=DC2620A-A.pdf

  • 2

    DEMO MANUAL DC2620A-A

    Rev. B

    QUICK START PROCEDUREDemonstration circuit 2620A-A makes it easy to use the LTC7106 to adjust any conventional VFB referenced regulator and evaluate its performances. Refer to Figure 1 for the system setup and boards connection.

    Connecting a PC and a Regulator to DC2620A-A

    You can use a PC to reconfigure the power management features of the LTC7106 such as: program IDAC cur-rent, margin IDAC high/low, read back IDAC value and check fault status. The DC1613A dongle may be plugged in regardless of whether VIN is present. Dongle can be hot plugged.

    DC2620A-A can adjust the output voltage of any VFB ref-erenced regulator. Use a twisted wire pair to connect the IDAC and GND pins of DC2620A-A to VFB and GND pins of the regulator board.

    Figure 1. Demo Setup with PC

    Follow the procedure below:

    1. Make sure JP3 is in OFF position to disable the LTC7106 before turning on the regulator.

    2. Turn on the regulator and check for the output voltage as expected.

    3. Once the proper output voltage is established on the regulator, put JP3 to the ON position to enable the LTC7106.

    4. Open the LTpowerPlay software and adjust the IDAC current value of the LTC7106 through it. Monitor the regulator’s output voltage as IDAC is changing. See LTpowerPlay Quick Start session for details

    DC2620A-A F01

    Demo Board DC2620A-A

    USB to I2C/PMBus Dongle

    DC1613A

    2.5V to 5.5V Power Supply(OPTIONAL)

    USB CABLE

    12-PIN

    CONNECTOR

    VIN

    IDAC

    GND

    VFB Referenced Regulator

    VFB

    GND

    https://www.analog.com/DC2620A-A?doc=DC2620A-A.pdf

  • 3

    DEMO MANUAL DC2620A-A

    Rev.B

    QUICK START PROCEDUREFigure 2 shows an application diagram using the LTC7106 with a typical DC/DC voltage regulator. By connecting IDAC to the feedback node of the voltage regulator, IDAC can change the output voltage of the regulator with the equation:

    VOUT = VREF 1+

    RFB1RFB2

    ⎣⎢⎢⎢

    ⎦⎥⎥⎥

    – IDAC • RFB1

    where VREF is the reference voltage of the voltage regula-tor. RFB1 and RFB2 are the resistor divider for the voltage regulator. IDAC is the programmed bidirectional current of the LTC7106.

    Figure 2. An Application Diagram Using the LTC7106 with a Typical DC/DC Voltage Regulator

    In order to achieve the best IDAC current accuracy of the LTC7106, it’s recommended to carefully design the volt-age divider so that the LTC7106 uses its nominal range. A design tool has been developed to help customers optimize their design. It’s built into the toolbox of the LTpowerCAD® software tool and can be downloaded from:

    LTpowerCAD

    C11µF

    10kR1

    10kR2

    RFB1

    RFB2

    C2330µF

    L1

    R410k

    LTC7106

    VDD

    GND

    IDAC

    SDA

    SCL

    ALERT

    GPO

    ASEL0 ASEL1

    VDD2.5V

    TO 5.5V

    SDA

    ALERT

    SCL

    VDD

    VIN

    DC/DC

    SW

    VFB

    VOUT

    RUN

    EN

    (0.4V to 2V)

    VIN

    VREF

    10kR3

    PMBus INTERFACE

    –64μA TO 0μA

    0μA TO 63μA

    DC2620A-A F02

    https://www.analog.com/DC2620A-A?doc=DC2620A-A.pdfhttps://www.analog.com/en/design-center/ltpowercad.html?doc=DC2620A-A.pdf

  • 4

    DEMO MANUAL DC2620A-A

    Rev. B

    Figure 3. LTpowerPlay Main Interface for LTC7106

    LTpowerPlay is a powerful Windows-based develop-ment environment that supports Analog Devices power system management ICs, including the LTC3880, LTC3883, LTC3882, LTC3815, LTC2974 and LTC2978. The software supports a variety of different tasks. You can use LTpowerPlay to evaluate Analog Devices ICs by connecting to a demo board system. LTpowerPlay utilizes the DC1613A USB-to-SMBus controller to com-municate with one of many potential targets, including

    LTpowerPlay SOFTWARE GUI the LTC7106’s DC2620A-A demo system, or a customer board. The software also provides an automatic update feature to keep the software current with the latest set of device drivers and documentation. The LTpowerPlay software can be downloaded from:

    LTpowerPlay

    To access technical support documents for ADI Digital Power Products visit Help. View online help on the LTpowerPlay menu.

    https://www.analog.com/DC2620A-A?doc=DC2620A-A.pdfhttps://www.analog.com/en/design-center/ltpower-play.html?doc=DC2620A-A.pdf

  • 5

    DEMO MANUAL DC2620A-A

    Rev.B

    The following procedure describes how to use LTpowerPlay to monitor and change the settings of LTC7106.

    1. Download and install the LTPowerPlay GUI:

    LTpowerPlay

    2. Launch the LTpowerPlay GUI.

    a. The GUI should automatically identify the DC2620A-A. The system tree on the left-hand side should look like this:

    LTpowerPlay QUICK START PROCEDURE

    b. A blue message box shows for a few seconds in the lower left-hand corner, confirming that the LTC7106 is communicating:

    c. In the Toolbar, click the “R” icon (RAM to PC) to read the RAM from the LTC7106. This reads the configuration from the RAM of LTC7106 and loads it into the GUI. When first powering on, you should read IDAC current at zero (high impedance IDAC) due to the LTC7106’s internal power-on reset circuitry until a valid write takes place. The IDAC current value can be plotted in real time, shown in the following screenshot (at zero when first powering on):

    https://www.analog.com/DC2620A-A?doc=DC2620A-A.pdfhttps://www.analog.com/en/design-center/ltpower-play.html?doc=DC2620A-A.pdf

  • 6

    DEMO MANUAL DC2620A-A

    Rev. B

    d. If you want to change the IDAC current to 10μA for example, in the Config tab, type “10” in the MFR_IOUT_COMMAND_LTC7106:

    LTpowerPlay QUICK START PROCEDURE

    Then, click the “W” icon (PC to RAM) to write these register values to the LTC7106.

    If the write is successful, you will see the following message:

    In the Telemetry Plot, you will see IDAC current value change to the commanding value:

    e. If you want to change the IDAC current to a negative value (meaning sinking current), you need to change the MFR_IOUT_MAX_LTC7106 to a negative value first (see data sheet for more details).

    https://www.analog.com/DC2620A-A?doc=DC2620A-A.pdf

  • 7

    DEMO MANUAL DC2620A-A

    Rev.B

    PARTS LISTITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

    Required Circuit Components

    1 1 C1 CAP., 1.0μF, X5R, 10V, 10%, 0603 AVX, 0603ZD105KAT2A

    2 1 C2 CAP., 100pF, X7R, 25V, 5%, 0603 AVX, 06033C101JAT2A

    3 4 R1, R5, R6, R9 RES., 0Ω, 1/10W, 0603 VISHAY, CRCW06030000Z0EA

    4 3 R2, R3, R7 RES., 10k, 1%, 1/10W, 0603 KOA SPEER, RK73H1JTTD1002F

    5 3 R10, R11, R12 RES., 100Ω, 1%, 1/10W, 0603 NIC, NRC06F1000TRF

    6 1 U1 IC, DAC 7-BIT CURRENT DAC ANALOG DEVICES, LTC7106EDDB

    Additional Demo Board Circuit Components

    1 0 C3 CAP., OPTION, 0603 OPTION

    2 0 R4 RES., OPTION, 0603 OPTION

    3 0 JP4 CONN., OPTION OPTION

    4 0 J2 CONN., OPTION OPTION

    Hardware

    1 8 E1, E2, E3, E4, E5, E6, E7, E8 TEST POINT, TURRET, 0.094", MTG. HOLE MILL-MAX, 2501-2-00-80-00-00-07-0

    2 1 J1 CONN., HDR, SHROUDED, 2mm × 6mm, 2mm, THT, VERT FCI, 98414-G06-12ULF

    3 2 JP1, JP2 CONN., HDR, MALE, 1mm × 4mm, 2mm, THT, STR WURTH ELEKTRONIK, 62000411121

    4 1 JP3 CONN., HDR., MALE, 1mm × 3mm, 2mm, THT, STR SULLINS CONNECTOR SOLUTIONS, NRPN031PAEN-RC

    5 1 LB1 LABEL SPEC, DEMO BOARD SERIAL NUMBER BRADY, THT-96-717-10

    6 4 MP1, MP2, MP3, MP4 STANDOFF, NYLON, SNAP-ON, 0.250" KEYSTONE, 8831

    7 1 PCB1 PCB, DC2620A ANALOG DEVICES, 600-DC2620A

    8 4 XJP1, XJP2, XJP3, XJP4 CONN., SHUNT, FEMALE, 2 POS, 2mm WURTH ELEKTRONIK, 60800213421

    https://www.analog.com/DC2620A-A?doc=DC2620A-A.pdf

  • 8

    DEMO MANUAL DC2620A-A

    Rev. B

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    https://www.analog.com/DC2620A-A?doc=DC2620A-A.pdf

  • 9

    DEMO MANUAL DC2620A-A

    Rev.B

    Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices.

    https://www.analog.com/DC2620A-A?doc=DC2620A-A.pdf

  • 10

    DEMO MANUAL DC2620A-A

    Rev. B

    ANALOG DEVICES, INC. 2017-2020

    03/20www.analog.com

    ESD Caution ESD (electrostatic discharge) sensitive device. Charged devices and circuit boards can discharge without detection. Although this product features patented or proprietary protection circuitry, damage may occur on devices subjected to high energy ESD. Therefore, proper ESD precautions should be taken to avoid performance degradation or loss of functionality.

    Legal Terms and Conditions By using the evaluation board discussed herein (together with any tools, components documentation or support materials, the “Evaluation Board”), you are agreeing to be bound by the terms and conditions set forth below (“Agreement”) unless you have purchased the Evaluation Board, in which case the Analog Devices Standard Terms and Conditions of Sale shall govern. Do not use the Evaluation Board until you have read and agreed to the Agreement. Your use of the Evaluation Board shall signify your acceptance of the Agreement. This Agreement is made by and between you (“Customer”) and Analog Devices, Inc. (“ADI”), with its principal place of business at One Technology Way, Norwood, MA 02062, USA. Subject to the terms and conditions of the Agreement, ADI hereby grants to Customer a free, limited, personal, temporary, non-exclusive, non-sublicensable, non-transferable license to use the Evaluation Board FOR EVALUATION PURPOSES ONLY. Customer understands and agrees that the Evaluation Board is provided for the sole and exclusive purpose referenced above, and agrees not to use the Evaluation Board for any other purpose. Furthermore, the license granted is expressly made subject to the following additional limitations: Customer shall not (i) rent, lease, display, sell, transfer, assign, sublicense, or distribute the Evaluation Board; and (ii) permit any Third Party to access the Evaluation Board. As used herein, the term “Third Party” includes any entity other than ADI, Customer, their employees, affiliates and in-house consultants. The Evaluation Board is NOT sold to Customer; all rights not expressly granted herein, including ownership of the Evaluation Board, are reserved by ADI. CONFIDENTIALITY. This Agreement and the Evaluation Board shall all be considered the confidential and proprietary information of ADI. Customer may not disclose or transfer any portion of the Evaluation Board to any other party for any reason. Upon discontinuation of use of the Evaluation Board or termination of this Agreement, Customer agrees to promptly return the Evaluation Board to ADI. ADDITIONAL RESTRICTIONS. Customer may not disassemble, decompile or reverse engineer chips on the Evaluation Board. Customer shall inform ADI of any occurred damages or any modifications or alterations it makes to the Evaluation Board, including but not limited to soldering or any other activity that affects the material content of the Evaluation Board. Modifications to the Evaluation Board must comply with applicable law, including but not limited to the RoHS Directive. TERMINATION. ADI may terminate this Agreement at any time upon giving written notice to Customer. Customer agrees to return to ADI the Evaluation Board at that time. LIMITATION OF LIABILITY. THE EVALUATION BOARD PROVIDED HEREUNDER IS PROVIDED “AS IS” AND ADI MAKES NO WARRANTIES OR REPRESENTATIONS OF ANY KIND WITH RESPECT TO IT. ADI SPECIFICALLY DISCLAIMS ANY REPRESENTATIONS, ENDORSEMENTS, GUARANTEES, OR WARRANTIES, EXPRESS OR IMPLIED, RELATED TO THE EVALUATION BOARD INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTY OF MERCHANTABILITY, TITLE, FITNESS FOR A PARTICULAR PURPOSE OR NONINFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS. IN NO EVENT WILL ADI AND ITS LICENSORS BE LIABLE FOR ANY INCIDENTAL, SPECIAL, INDIRECT, OR CONSEQUENTIAL DAMAGES RESULTING FROM CUSTOMER’S POSSESSION OR USE OF THE EVALUATION BOARD, INCLUDING BUT NOT LIMITED TO LOST PROFITS, DELAY COSTS, LABOR COSTS OR LOSS OF GOODWILL. ADI’S TOTAL LIABILITY FROM ANY AND ALL CAUSES SHALL BE LIMITED TO THE AMOUNT OF ONE HUNDRED US DOLLARS ($100.00). EXPORT. Customer agrees that it will not directly or indirectly export the Evaluation Board to another country, and that it will comply with all applicable United States federal laws and regulations relating to exports. GOVERNING LAW. This Agreement shall be governed by and construed in accordance with the substantive laws of the Commonwealth of Massachusetts (excluding conflict of law rules). Any legal action regarding this Agreement will be heard in the state or federal courts having jurisdiction in Suffolk County, Massachusetts, and Customer hereby submits to the personal jurisdiction and venue of such courts. The United Nations Convention on Contracts for the International Sale of Goods shall not apply to this Agreement and is expressly disclaimed.

    https://www.analog.com/DC2620A-A?doc=DC2620A-A.pdfhttps://www.analog.com?doc=DC2620A-A.pdf

    DescriptionQuick Start ProcedureLTpowerPlay Software GUI LTpowerPlay Quick Start ProcedureParts ListSchematic Diagram