DEMO MANUAL DC2026A Linduino One Isolated Arduino-Compatible Demonstration Board Description Linear Technology’s DC2026 (called the Linduino One) is compatible with the Arduino Uno microcontroller board. Arduino hardware consists of an Atmel microcontroller with a bootloader allowing quick in-circuit firmware updates. The software is a simple programming environment based on the AVRGCC compiler. This platform is popular because it is easy to use, both the hardware and software are open source, and it can be programmed in C. We find it an ideal way to demonstrate and distribute libraries for integrated circuits that have digital interfaces such as Inter-Integrated Circuit (I2C) and Serial Peripheral Interface (SPI). While the Linduino One is Arduino-compatible, it is not produced by the official Arduino team, and they do not receive any monetary support from this board. Please, consider supporting them by purchasing other items from: http://store.arduino.cc The Linduino One adds several features to the standard Arduino Uno board: • A 14-pin QuikEval™ connector provides a direct connection to a growing list of hundreds of Linear Technology demo boards, including ADCs, DACs, Power System Management, RF Synthesizers, System Monitor and Control, and many others. • An LTM®2884 provides galvanic isolation of USB data and power for both safety and noise rejection. • Auxiliary 7V to 20V power input on isolated side, with conversion to 5V provided by an LT®3973 allowing high power operation up to 750mA. Design files for this circuit board are available at http://www.linear.com/demo L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and QuikEval is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. ARDUINO SHIELD HEADERS USB TO COUMPUTER IN-CIRCUIT PROGRAMMING HEADER QUIK-EVAL COMPATIBLE DEMO BOARD 7V TO 20V AUXILIARY POWER + – 14 CONDUCTOR RIBBON CABLE ARDUINO SHIELD HEADERS Figure 1. Linduino One Basic Connections dc2026afa 1 DEMO MANUAL DC2026A Quick Start Guide The Linduino One comes preloaded with a DC590 emulator program (called a “sketch”) that allows attached demo boards to run with the standard QuikEval GUI software. This allows the functionality of the board to be verified before starting firmware development. After evaluation with QuikEval, the Linduino One can be reprogrammed with customer code. There is a top-level demonstration sketch for each part’s library that provides a text terminal interface to the board, demonstrating the library functions. The Linduino One is also available as DC2107, which includes a DC934 as an easy to use example daughter board. DC934 is the demonstration board for the LTC®2607 dual 16-bit, I2C digital to analog converter (DAC). This board also has an LTC2422 2-channel, 20-bit, SPI interface analog to digital converter (ADC) that reads back the DAC output. Thus, this board demonstrates operation of both SPI and I2C interfaces, and multichannel ADCs and DACs. The following sections describe the procedure for installing the required software and operating the DC934 with both QuikEval software and with a terminal based demo program. While this manual describes operation with the DC934, the procedure applies to other boards as well. Software Installation 1)Download LTSketchbook.zip from http://www.linear. com/designtools/linduino.php This is the entire code base for the Linduino board, including all demo code, libraries for individual devices, auxiliary functions, and HTML documentation. Extract this file to a location for working files, such as your “My Documents” directory or “C:\Projects”. 2)Note: If QuikEval is already installed, please update to the latest version by selecting Tools → Update Program, then proceed to step 3. If not, download and run QuikEval from www.linear.com/software. This installs the QuikEval program, as well as the FTDI USB drivers required for the Linduino One (and other Linear Technology interface boards.) Drivers are also distributed with the Arduino IDE, but it is recommended to let QuikEval install the drivers to ensure compatibility with the Linduino One. You will be prompted to connect the board to the PC during installation. Once the installation is complete, quit QuikEval. 3)Download the Arduino Integrated Development Environment (IDE) from either http://arduino.cc/en/Main/Software or http://www.linear.com/designtools/linduino.php (Version 1.0.4 is used in this manual.) This is not an installer; no installation is necessary. Extract the contents of this file to a convenient location for programs, such as “C:\Program Files”. The “Arduino.exe” file is the actual program file; double-click to open the Arduino IDE. 2 dc2026afa DEMO MANUAL DC2026A Quick Start Guide Arduino IDE Setup 1)From within the Arduino IDE, click on File → Preferences Under Sketchbook Location: select Browse, and locate the path to the extracted LTSketchbook.zip file. The correct location will show “LTSketchbook” in the Look In menu, and at least four subdirectories will be shown: Documentation, Libraries, Part Number and Utilities (more may be added in the future). Click Open, then click OK. dc2026afa 3 DEMO MANUAL DC2026A Quick Start Guide 2)Under Tools menu, select Board → Arduino Uno 3)Under the Tools menu, select Serial Port. There may be more than one option; the Linduino One is usually the highest COM port number (COM12 is shown below). 4 dc2026afa DEMO MANUAL DC2026A Quick Start Guide 4)Click on the Serial Monitor, which looks like a magnifying glass: This will bring up the monitor window: Select Newline terminator and set the baud rate to 115200. You should see a “hello” message – this indicates that serial communication is set up properly, and that the DC590 emulator firmware is properly installed. Pressing the RESET button on the Linduino One will cause the message to be sent again. If this message does not appear, try a different COM port. (Note: The DC590 emulator sketch can be restored by following the procedure detailed below for uploading the DC934 sketch, substituting the DC590 sketch which is located in File → Sketchbook → Utilities → DC590B.) 5)Quit the Arduino IDE. Note that a restart is required every time the Sketchbook location is changed. dc2026afa 5 DEMO MANUAL DC2026A Quick Start Guide Running with QuikEval Linear Technology demo boards with the 14-pin QuikEval connector are normally used in conjunction with a DC590B interface board and the QuikEval software package running on a PC. Designers can then use the software to evaluate the performance of the product on the demo board. The Linduino One comes programmed with firmware that allows it to emulate the DC590B controller, so the QuikEval software can be used to check basic functionality in a target system. 6 Connect the DC934 to the Linduino One with the supplied 14-pin ribbon cable. Run QuikEval. The control panel for the LTC2607 will appear, and clicking COLLECT will start communication with the board. The onboard LTC2422 ADC reads back the output voltages, and the voltage may be changed by entering a number in the appropriate box or by moving the sliders. Quit QuikEval after this step. dc2026afa DEMO MANUAL DC2026A Quick Start Guide Running with the Linduino Demonstration Program After the DC934 has been run with the user-friendly QuikEval GUI, a demonstration program can be loaded into the Linduino One that demonstrates the library functions for the LTC2607 and LTC2422. 1)Open the Arduino IDE. Find the part number on the demo board, LTC2607 in this case. In the File menu select Sketchbook → Part Number → 2000 → 2600 → 2607 → DC934A. (There may be other entries for a particular part number showing example usage cases, experiments, etc. The entry for the demo circuit number is the general-purpose demonstration program and is a good place to start.) dc2026afa 7 DEMO MANUAL DC2026A Quick Start Guide A new window will appear with the sketch. 2)Upload the sketch by clicking the UPLOAD button: When this process is completed, a message at the bottom should display a similar message as shown. 8 dc2026afa DEMO MANUAL DC2026A Quick Start Guide 3)Open the Serial Monitor (magnifying glass icon) once more. The monitor will now display the program interface. To use the program, enter commands into the text box, then click the Send button. dc2026afa 9 DEMO MANUAL DC2026A Quick Start Guide Going Further Jumpers After completing the procedure in this Quick Start Guide, all of the tools are in place to move on to other products or further experimentation with the DC934. The main page for all Linduino resources is: JP1: Factory use only. http://www.linear.com/designtools/linduino.php HTML documentation for the code is provided in the sketchbook in the Documentation subdirectory. External Connections J1: QuikEval header – Connection to QuikEval demonstration board. This connector provides 5V at 50mA, 7.6V at 50mA, SPI and I2C interfaces, and an auxiliary I2C interface for identification of the attached demonstration board. J2: AC ADAPTOR IN – 2.1mm × 5.5mm barrel connector. Optional DC power input, 7V to 20V DC. With external power applied, up to 750mA can be drawn from the 5V supply (available on pins 2 and 5 on J3, or pin 10 on J1.) J3, J6, J7, J8: Arduino shield headers. These headers are compatible with standard Arduino “shield” add-on boards. Refer to schematic for individual signals. J4: ICSP – In-circuit serial programming header. Used in conjunction with an external programming tool such as an AVR Dragon or JTAGICE3. JP2: Reset configuration, not installed. When the ICSP header is used with an external tool, install a 3 position, 0.1" header in this location and cut the trace labeled NORM on the back side of the board. Place jumper in the righthand position (opposite to NORM) to allow the ICSP tool to control the RESET signal, install in the NORM position to allow the FT232 DTR signal to control RESET (this is normal Arduino operation, and required to program the board from within the Arduino IDE.) LEDs ON: Lights when 5V supply is on, from which all other supply voltages are generated. SCK: Lights when Arduino pin 13 (SCK on the SPI bus) is high. This is the pin used in the “blink” sketch under File → Examples → Basics → Blink. RX: Lights when data is being received from the host computer through the USB port. TX: Lights when data is being sent to the host computer through the USB port. RESET Button (S1): Asserts the ATMega328’s RESET line, restarting program execution. J5: USB – Connection to the host computer. Power for the Linduino and the connected daughter board is also taken from J5 if no external power is supplied to J2. 10 dc2026afa PC USB 5V USB D D–_USB +_USB MAX 200mA 5V_ISO GND_ISO D D–_ISO +_ISO LTM2884 USB ISOLATOR 5V_USB GND_USB AC ADAPTER 7V TO 20V OUT PIN 0 PIN 1 5V 5V LT1761 OUT LDO OUT SERIAL RESET I/O I/O (FOR ADC) ATMEGA328P IN IN LT3461 BOOST MAX 750mA OUT 5V LOW NOISE 7V PIN A4/I2C SDA PINS 2-13 PIN 11/SPI MOSI PIN 13/SPI SCK PIN A5/I2C SCL LT1761 IN LDO OUT IN LT1761 LDO PINS A0-A5 3.3V 7.6V PIN NAMES CORRESPOND TO ARDUINO PINS. PIN 8 SWITCHES MUX BETWEEN MICROCONTROLLER I2C PORT (PINS A4, A5) AND MICROCONTROLLER SPI PORT (PINS 11, 13) DEMO BOARD EEPROM (EESCI, EESDA) IS ALWAYS CONNECTED TO MICROCONTROLLER I2C PORT (PINS A4, A5) FTDI USB-TO-SERIAL D+ TX D– RX DTR 5V LTC4411 IDEAL DIODE IN LT3973 BUCK MAX 750mA PIN 8 5V 7V PIN A5 PIN A4 PIN 12 PIN 10 PIN 9 5V LOW NOISE J1 EEVCC EESCL EEDA EEGND DC2026 BD V+ 5V GPIO SCL/SCK SDA/MOSI MISO CS GND DEMO MANUAL DC2026A Block Diagram 11 dc2026afa DEMO MANUAL DC2026A Parts List ITEM QTY REFERENCE 1 2 C1, C7 PART DESCRIPTION MANUFACTURER/PART NUMBER CAP., X5R, 4.7µF, 16V 10% 0603 TDK, C1608X5R1C475K 2 3 C2, C8, C14 CAP., X7R, 0.01µF, 16V 10% 0603 AVX, 0603YC103KAT2A 3 4 C3, C9, C12, C15 CAP., X5R, 10µF, 16V 10% 0805 MURATA, GRM21BR61C106KE15L 4 5 C4, C13, C17, C18, C23 CAP., X7R, 1µF, 16V 10% 0603 TDK, C1608X7R1C105K 5 1 C5 CAP., NPO, 15pF, 50V 10% 0603 AVX, 06035A150KAT2A 6 1 C6 CAP., X5R, 4.7µF, 25V 10% 0805 TDK, C2012X5R1E475K 7 1 C10 CAP., COG, 10pF, 25V 10% 0402 AVX, 04023A100KAT2A 8 1 C11 CAP., X5R, 22µF, 6.3V 20% 1206 TAIYO YUDEN, JMK316BJ226ML-T 9 1 C16 CAP., X7R, 2.2µF, 50V 10% 1206 MURATA, GRM31CR71H225KA88L 10 6 C19, C20, C21, C22, C25, C28 CAP., X7R, 0.1µF, 16V 10% 0603 AVX, 0603YC104KAT2A 11 1 C24 CAP., X7R, 0.047µF, 16V 10% 0603 AVX, 0603YC473KAT2A 12 1 C26 CAP., ALUM., 10µF 50V 10% SMT SUN ELECT., 50CE10BSS 13 1 C27 CAP., X5R, 0.22µF, 10V 20% 0402 AVX, 0402ZD224MAT2A 14 0 C29 CAP., OPT, 0805 OPTION 15 2 C30, C31 CAP., X7R, 2.2nF, 1kV 10% 1206 AVX, 1206AC222KAT1A 16 3 D1, D4, D5 LED,YELLOW, DIFFUSED, 0805 AVAGO, HSMY-C170 17 1 D2 LED,GREEN, DIFFUSED, 0805 AVAGO, HSMG-C170 18 1 D3 DIODE, SCHOTTKY, 100V 2A, SMB DIODES INC., B2100-13-F 19 1 J1 HEADER, 2×7 DUAL ROW MOLEX 87831-1420 20 1 J2 CONNECTOR, POWER JACK, 2.1mm CUI INC., PJ-002AH 21 2 J3, J8 CONN., RECEPT., 0.100, 8 POSITION SULLINS, PPPC081LFBN-RC 22 1 J4 HEADER, 2mm × 3mm PIN, 0.100 SAMTEC, TSW-103-07-G-D 23 1 J5 CONNECTOR, USB TYPE B, RIGHT ANGLE PCB MOUNT FCI, 61729-0010BLF (6tbs × 44) 24 1 J6 CONN., RECEPT., 0.100, 10 POSITION SULLINS, PPPC101LFBN-RC 25 1 J7 CONN., RECEPT., 0.100, 6 POSITION SULLINS, PPPC061LFBN-RC 26 1 L1 INDUCTOR, 15µH, 1.3A, SMD COOPER/COILTRONICS, MPI4040R3-150-R 27 1 L2 INDUCTOR, SHIELDED POWER, 10µH, SMT COILCRAFT, XFL3010-103ME 28 1 Q1 TRANSISTOR, MOSFET, N-CH 60V,150mA, SOT-23 DIODES INC., VN10LF 29 1 R1 RES., CHIP, 64.9k, 1/10W, 1% 0603 VISHAY, CRCW060364K9FKEA 30 1 R2 RES., CHIP, 47.5k, 1/10W, 1% 0603 VISHAY, CRCW060347K5FKEA 31 1 R3 RES., CHIP, 215k, 1/10W, 1% 0603 VISHAY, CRCW0603215KFKEA 32 1 R4 RES., CHIP, 13.7k, 1/10W, 1% 0603 VISHAY, CRCW060313K7FKEA 33 1 R5 RES., CHIP, 42.2k, 1/10W, 1% 0603 VISHAY, CRCW060342K2FKEA 34 5 R6, R7, R8, R9, R10 RES., CHIP, 4.99k, 1/10W, 1% 0603 VISHAY, CRCW06034K99FKEA 35 0 R11, R17, R19, R32 RES., CHIP, OPT, 0805 OPTIONAL 36 8 R12, R13, R15, R20, R21, R22, R23, R24 RES., CHIP, 1k, 1/10W, 1% 0603 VISHAY, CRCW06031K00FKEA 37 1 R14 RES., CHIP, 1M, 1/16W, 1% 0402 VISHAY, CRCW04021M00FKED 38 1 R16 RES., CHIP, 1M, 1/10W, 1% 0603 VISHAY, CRCW06031M00FKEA 39 1 R18 RES., CHIP, 10k, 1/10W, 1% 0603 VISHAY, CRCW060310K0FKEA 40 0 R25 RES., CHIP, OPT, 0603 OPTIONAL 12 dc2026afa DEMO MANUAL DC2026A Parts List ITEM PART DESCRIPTION MANUFACTURER/PART NUMBER 41 QTY REFERENCE 1 R26 RES., CHIP, 0.20Ω, 1/4W, 5% 0805 PANASONIC, ERJ-S6SJR20V 42 1 R27 RES., CHIP, 107k, 1/16W, 1% 0402 VISHAY, CRCW0402107KFKED 43 1 R28 RES., CHIP, 475k, 1/16W, 1% 0402 VISHAY, CRCW0402475KFKED 44 1 R29 RES., CHIP, 215k, 1/16W, 1% 0402 VISHAY, CRCW0402215KFKED 45 1 R30 RES., CHIP, 316k, 1/16W, 1% 0402 VISHAY, CRCW0402316KFKED 46 1 R31 RES., CHIP, 100Ω, 1/16W, 5% 0603 VISHAY, CRCW0603100RJKEA 47 1 S1 SWITCH, PUSHBUTTON, MINIATURE WÜRTH, 434 111 025 826 48 1 U1 MODULE, USB TRANSCEIVER, BGA-44 LINEAR TECH., LTM2884CY#PBF 49 1 U2 IC, DC/DC CONVERTER, TSOT-23 LINEAR TECH., LT3461ES6#PBF 50 1 U3 IC, LDO MICROPOWER REGULATOR, 5V, TSOT-23 LINEAR TECH., LT1761ES5-5#PBF 51 1 U4 IC, ANALOG SWITCH, 10-MSOP FAIRCHILD, FSA2257MUX 52 1 U5 IC, LDO MICROPOWER REGULATOR, 3.3V, TSOT-23 LINEAR TECH., LT1761ES5-3.3#PBF 53 1 U6 IC, IDEAL DIODE, LOW LOSS,TSOT-23 LINEAR TECH., LTC4411ES5#TRMPBF 54 1 U7 IC, MICROCONTROLLER ATMEL, ATMEGA328P-AU 55 1 U8 IC, LDO MICROPOWER REGULATOR, ADJUSTABLE, TSOT-23 LINEAR TECH., LT1761ES5-BYP#TRMPBF 56 1 U9 IC, USB UART, 28-SSOP FTDI, FT232RL-REEL 57 1 U10 IC, STEP-DOWN REGULATOR, MS10 LINEAR TECH., LT3973EMSE#PBF 58 1 Y1 RESONATOR, 16MHz, SMT MURATA, CSTCE16M0V53-R0 dc2026afa 13 A B C D FROM U1 PAGE 2 DISO+ DISO- 5 ON D2 GREEN C23 1.0uF 16V C20 0.1uF 16V OPT JP2 R31 100 2 1 4 SCK 17 28 27 24 19 8 15 16 20 3V3OUT OSCO OSCI NC RESET# NC USBDP USBDM VCC VCCIO CBUS4 CBUS3 CBUS2 CBUS1 RX +5V 1 Q1 VN10LF 13 D4 YELLOW R13 1K RI# DCD# DSR# DTR# CTS# RTS# RXD TXD CBUS0 FT232RL U9 +5V R20 1K 12 14 13 22 23 6 10 9 2 11 3 5 1 TRACE ON BOTTOM SIDE 3 D1 YELLOW R12 1K +5V NORM GND S1 RESET 2 1 GND 18 GND 21 TEST 26 AGND 25 2 1 3 R21 1K C21 0.1uF 16V 16 Mhz Y1 R18 10K 4 +5V 2 22 19 3V3 A5 A4 A3 A2 A1 A0 7 ~6 ~5 4 ~3 2 TX_1 RX_0 28 27 26 25 24 23 11 10 9 2 1 32 31 30 SCALE = NONE APP ENG. D.EDDLEMAN PCB DES. M.HAWKINS APPROVALS 4 3 2 +5V 1S 2S 2B0 2B1 1B0 1B1 2A 1A R7 4.99K R10 4.99K TP4 TP3 3 8 13 4 5 7 6 14 10 11 9 12 2 GND GND GND SCK/SCL MISO MOSI/SDA CS GPIO EEVCC EESCL EESDA EEGND 5V V+ IO 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only 1 1 +5V 7V 1 6 5 J1 4 3 +5V 2 5V_LOW_NOISE R9 4.99K J4 ICSP 1 DATE: LTM2884 01/07/2013 1 DEMO CIRCUIT 2026A IC NO. SHEET 1 OF 2 2 REV. LINDUINO ONE: LINEAR TECHNOLOGY ISOLATED ARDUINO-COMPATIBLE DEMONSTRATION BOARD TECHNOLOGY FSA2257MUX U4 MOSI/SDA 4 SCK/SCL 9 DATE APPROVED D.EDDLEMAN 01/07/2013 PRODUCTION 1 DESCRIPTION REVISION HISTORY C25 0.1uF R6 4.99K +5V 2 REV TITLE: SCHEMATIC J7 ANALOG IN R15 1K 7 2 10 1 5 6 - ECO SCL SDA N/A THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 2 R25 OPT VIN FROM J2, PAGE 2 13 12 ~11 ~10 ~9 8 17 16 15 14 13 12 GND CUSTOMER NOTICE J3 +5V PD7(AIN1) PD6(AIN0) PD5(T1) PD4(XCK/T0) PD3(INT1) PD2(INT0) PD1(TXD) PDO(RXD) PC5(ADC5/SCL) PC4(ADC4/SDA) PC3(ADC3) PC2(ADC2) PC1(ADC1) PC0(ADC0) RESET POWER ADC7 ADC6 VCC VCC GND GND GND AREF AVCC PB5(SCK) PB4(MISO) PB3(MOSI/OC2A) PB2(SS/OC1B) PB1(OC1A) PB7(XTAL2/TOSC2) PB0(ICP1) PB6(XTAL1/TOSC1) PC6 (RESET) R8 4.99K 5V_LOW_NOISE LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. C28 0.1uF 16V 4 6 21 3 5 20 18 8 7 29 U7 ATMEGA328P-AU DIGITAL(PWM~) J8 SIZE C22 0.1uF 16V C19 0.1uF 16V +5V 3 SIZE 0603 UNLESS OTHERWISE SPECIFIED. TX D5 YELLOW R22 1K R24 1K R23 1K C18 1.0uF 16V AREF R16 1 MEG RESET J6 NOTE: ALL RESISTORS AND CAPACITORS ARE 2 1 7 2 2 1 1 3 10 9 8 7 6 5 4 3 2 1 SCL SDA AREF GND 13 12 ~11 ~10 ~9 MUX SEL 8 8 7 6 5 4 3 2 1 7 ~6 ~5 4 ~3 2 TX_1 RX_0 1 2 3 4 5 6 7 8 3 VCC GND 8 A0 A1 A2 A3 A4 A5 14 1 2 3 4 5 6 5 A B C D DEMO MANUAL DC2026A Schematic Diagram dc2026afa 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 representation that the interconnection of its circuits as described herein will not infringe on existing patent rights. A B C D 1 2 3 4 5 6 C29 OPT 4 6 SHDN VIN 2 A6 B1 B2 B3 B4 B5 B6 B7 B8 B9 B10 B11 A3 A4 A5 A2 A1 A7 A11 A10 A9 A8 GND GND GND GND GND GND GND GND GND GND GND GND C30 2.2nF 1kV 1206 SPND-PWR ON VLO D1+ D1- U1 7.6V 5 SIZE 0603 UNLESS OTHERWISE SPECIFIED. D2+ D2- VLO2 VCC2 VCC2 VCC2 VCC2 2.2nF 1kV 1206 4 L3 L4 L6 L7 K1 K2 K3 K4 K5 K6 K7 K8 K9 K10 K11 L2 L1 L5 L11 L10 L9 L8 R5 42.2K R3 215K C6 4.7uF 25V 0805 DISO- 2 C17 1.0uF 16V R26 0.20 OHMS 0805 1/4W PAGE 1 DISO+ TO U9 R11 OPT 0805 B2100 D3 USB 5V OUTPUT 200mA MAX C5 15pF OUTPUT 7.6V @ 100mA GND2 GND2 GND2 GND2 GND2 GND2 GND2 GND2 GND2 GND2 GND2 GND2 GND2 GND2 GND2 C31 LTM2884CY FB 3 5 LT3461ES6 U2 VOUT VBUS VCC VCC VCC VCC TO J3, PAGE 1 VIN USB GND USB GND 1 NOTE: ALL RESISTORS AND CAPACITORS ARE 7V-20V INPUT 1 3 2 AC ADAPTOR IN J2 C24 0.047uF 16V R2 47.5K USB GND USBVCC USBDUSBD+ USBGND USB GND R32 OPT USB J5 C4 1.0uF 16V +5V 1 SW GND 2 1 CTL IN 4 1 5 TP1 SHDN IN BYP VOUT 4 9 3 2 5 5 +5V 4 5 3 4 VIN PG EN/UVLO OUT GND 3 THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 3 1 U5 C9 10uF 16V 0805 SHDN IN R29 215K 0402 PCB DES. M.HAWKINS 2 SCALE = NONE APP ENG. D.EDDLEMAN 4 5 2 3V3 C15 10uF 16V 0805 C10 10pF COG 0402 DATE: N/A SIZE IC NO. 1 SHEET DEMO CIRCUIT 2026A 2 OF 2 2 REV. LINDUINO ONE: LINEAR TECHNOLOGY ISOLATED ARDUINO-COMPATIBLE DEMONSTRATION BOARD 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only C11 22uF 1206 +5V AC ADAPTOR 5V OUTPUT 750mA MAX L1 15uH SMT TECHNOLOGY R30 316K 0402 R14 1MEG 0402 C27 0.22uF 0402 1 3.3V OUTPUT 50mA MAX TRACE ON BOTTOM SIDE C14 0.01uF 16V 3.3V JP1 OPT 5V_LOW_NOISE C3 10uF 16V 0805 TITLE: SCHEMATIC BYP VOUT 1 R4 13.7K R1 64.9K LT1761ES5-3.3 C2 0.01uF 16V C8 0.01uF 16V 6 7 8 1 10 2 7V APPROVALS SW BOOST BD FB RT LT3973EMS U10 C12 C13 10uF 1.0uF 16V 16V 0805 CUSTOMER NOTICE C16 2.2uF TP2 1 1206 50V STAT VOUT +5V 3 1 U3 BYP ADJ VOUT LT1761ES5-5 IN LT1761ES5-BYP U8 LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. R27 107K 0402 R28 475K 0402 + C26 10uF 50V SUNCON 3 1 LTC4411ES5 U6 R17 OPT 0805 C7 16V 4.7uF 1 C1 4.7uF 16V R19 OPT 0805 3 GND 2 GND 2 4 GND 2 GND 2 L2 10uH GND 11 1 2 5 A B C D DEMO MANUAL DC2026A Schematic Diagram dc2026afa 15 DEMO MANUAL DC2026A 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 OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE. EXCEPT TO THE EXTENT OF THIS INDEMNITY, NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES. The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user releases LTC 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. Also be aware that the products herein may not be regulatory compliant or agency certified (FCC, UL, CE, etc.). No License is granted under any patent right or other intellectual property whatsoever. LTC assumes no liability for applications assistance, customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind. LTC currently services a variety of customers for products around the world, and therefore this transaction is not exclusive. 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 engineer. Mailing Address: Linear Technology 1630 McCarthy Blvd. Milpitas, CA 95035 Copyright © 2004, Linear Technology Corporation 16 Linear Technology Corporation dc2026afa LT 0913 REV A • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com LINEAR TECHNOLOGY CORPORATION 2013