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1 description linduino one isolated arduino -compatible demonstration board 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 up- dates . 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 ( i 2 c ) 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 l , lt, ltc, ltm, linear technology and the linear logo are registered trademarks and linduino and quikeval are trademarks of linear technology corporation. all other trademarks are the property of their respective owners. the linduino one adds several features to the standard arduino uno board: ? a 14- pin quikeval ? connector provides a direct connec - tion 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. ? selectable 5v, 3.3v, 2.5v, 1.8v logic levels and analog supply on quikeval connector ? an lt m ? 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/DC2026C figure 1. linduino one basic connections auxiliary power usb to computer 7v to 20v + ? in-circuit programming header j1 i/o voltage selection arduino shield headers quik-eval compatible demo board 14 conductor ribbon cable arduino shield headers DC2026Cfd demo manual DC2026C
2 quick start guide the linduino one comes preloaded with a dc590 emula- tor 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 DC2026C-kit, which includes a dc934 as an easy to use example daughter board . dc 934 is the demonstration board for the lt c ? 2607 dual 16-bit, i 2 c digital to analog converter (dac). this board also has an ltc2422 2-channel, 20-bit, spi inter - face analog to digital converter (adc) that reads back the dac output. thus, this board demonstrates operation of both spi and i 2 c 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. manual software installation 1) download ltsketchbook . zip from www . linear . com / docs /43958 . 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 pro- gram, 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 tech - nology 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 envi- ronment (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. DC2026Cfd demo manual DC2026C
3 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: documenta- tion, libraries, part number and utilities (more may be added in the future). click open, then click ok. DC2026Cfd demo manual DC2026C
4 2) under tools menu, select board arduino uno quick start guide DC2026Cfd demo manual DC2026C
5 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). quick start guide DC2026Cfd demo manual DC2026C
6 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 C 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. DC2026Cfd demo manual DC2026C
7 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 al- lows it to emulate the dc590b controller, so the quikeval software can be used to check basic functionality in a target system. 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. DC2026Cfd demo manual DC2026C
8 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.) quick start guide DC2026Cfd demo manual DC2026C
9 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. quick start guide DC2026Cfd demo manual DC2026C
10 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. DC2026Cfd demo manual DC2026C
11 quick start guide going further 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: 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 C connection to quikeval demonstra- tion board. this connector provides 5v at 50ma, 7.6v at 50 ma , spi and i 2 c interfaces , and an auxiliary i 2 c interface for identification of the attached demonstration board. j2: ac adaptor in C 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 C in- circuit serial programming header. used in conjunction with an external programming tool such as an avr dragon or jtagice3. j5: usb C 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. jumpers jp1: factory use only. 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 right- hand position (opposite to norm) to allow the icsp tool to control the reset signal, install in the norm position to allow the ft 232 dtr signal to control reset (this is normal arduino operation, and required to program the board from within the arduino ide.) jp3: vccio selection 5v ( default), 3.3 v, 2.5v, remove for 1.8v, or ext to disable the onboard regulator and supply vccio to the dc2026 from the attached demo board. refer to the documentation for the attached demo board for information on acceptable voltage levels.vccio is the low-voltage supply for the attached demo board. it also sets the logic level for the spi and i 2 c signals. 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 atmega 328s reset line, restarting program execution. DC2026Cfd demo manual DC2026C
12 block diagram 5v_usb gnd_usb d + _usb d ? _usb 5v_iso gnd_iso 5v usb ac adapter 7v to 20v max 200ma pc usb d + _iso d ? _iso ltm2884 usb isolator ltc4411 ideal diode ftdi usb-to-serial 5v d + d ? tx rx dtr lt3973 buck max 750ma in out lt1761 ldo atmega328p pins a0-a5 pins 2-13 pin 13/spi sck pin a4/i 2 c sda pin a5/i 2 c scl pin 11/spi mosi 5v pin 0 pin 1 reset serial i/o (for adc) i/o lt3461 boost max 750ma in out in out 3.3v lt1761 ldo lt1761 ldo in out in out 5v low noise vccio vccio 5v j1 5v 7v 7v 7.6v 5v v + vccio gpio scl/sck sda/mosi miso cs gnd eev cc eescl eeda eegnd pin 8 pin a5 pin a4 pin names correspond to arduino pins. pin 8 switches mux between microcontroller i 2 c port (pins a4, a5) and microcontroller spi port (pins 11, 13) demo board eeprom (eesci, eesda) is always connected to microcontroller i 2 c port (pins a4, a5) dc2026 bd v cc sclin sdain en discen acc v cc2 sclout sdaout ready fault tp3 tp4 pin 8 pin 8 pin 12 pin 9 + ? vccio/2 lt1719 pin 10 DC2026Cfd demo manual DC2026C
13 parts list item qty reference part description manufacturer / part number 1 2 c1, c7 cap., x5r, 4.7f, 16v, 10%, 0603 tdk, c1608x5r1c475k080ac 2 2 c2, c14 cap., x7r, 0.01f, 16v, 10%, 0603 avx , 0603yc103 kat 2a 3 4 c3, c9, c12, c15 cap., x5r, 10f, 16v, 10%, 0805 murata , grm21br61c106ke15l 4 5 c4, c13, c17, c18, c23 cap., x7r, 1f, 16v, 10%, 0603 tdk, c1608x7r1c105k080ac 5 1 c5 cap., npo, 15pf, 50v, 10%, 0603 avx , 06035a150 kat 2a 6 1 c6 cap., x5r, 4.7f, 25v, 10%, 0805 tdk, c2012x5r1e475k125ab 7 10 c8, c19-c22, c25, c28, c32-c34 cap., x7r, 0.1f, 16v, 10%, 0603 avx , 0603yc104 kat 2a 8 1 c10 cap., cog, 10pf, 25v, 10%, 0402 avx , 04023a100 kat 2a 9 1 c11 cap., x5r, 22f, 6.3v, 20%, 1206 taiyo yuden, jmk316abj226mlht 10 1 c16 cap., x7r, 2.2 f, 50v, 10%, 1206 murata , grm31cr71h225ka88l 11 1 c24 cap., x7r, 0.047f, 16v, 10%, 0603 avx , 0603yc473 kat 2a 12 1 c26 cap., alum., 10f, 50v, 10%, smt sun elect., 50ce10bss 13 1 c27 cap., x5r, 0.22f, 10v, 20%, 0402 avx , 0402zd224 mat 2a 14 0 c29 cap., opt , 0805 option 15 2 c30, c31 cap., x7r, 2.2nf, 1kv, 10%, 1206 avx , 1206ac222 kat 1a 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 jp3 header, 24 pin, 0.079cc sullins, nrpn042 paen-rc 20 1 j1 header, 27 dual row molex, 87831-1420 21 1 j2 connector, power jack, 2.1mm cui inc., pj-002ah 22 2 j3, j8 conn., recept., 0.100, 8 position sullins, pppc081lfbn-rc 23 1 j4 header, 23 pin, 0.100 samtec, tsw-103-07-l-d 24 1 j5 connector, usb type b, right angle pcb mount fci, 61729-0010blf 25 1 j6 conn., recept., 0.100, 10 position sullins, pppc101lfbn-rc 26 1 j7 conn., recept., 0.100, 6 position sullins, pppc061lfbn-rc 27 1 l1 inductor, 15h, 1.3a, smd cooper mpi4040r3-150-r 28 1 l2 inductor, shielded power, 10h, smt coilcraft , xfl3010-103me 29 4 mp1-mp4 bumper, adhesive-backed 3m, sj5376 30 1 q1 transistor, mosfet, n-ch 60v,150ma, sot-23 diodes inc., vn10 lfta 31 1 r1 res., chip, 64.9k, 1/10w, 1% 0603 vishay , crcw060364 k9fkea 32 1 r2 res., chip, 47.5k, 1/10w, 1% 0603 vishay , crcw060347k5fkea 33 1 r3 res., chip, 215k, 1/10w, 1% 0603 vishay , crcw0603215kfkea 34 1 r4 res., chip, 13.7k, 1/10w, 1% 0603 vishay , crcw060313k7fkea 35 1 r5 res., chip, 42.2k, 1/10w, 1% 0603 vishay , crcw060342k2fkea 36 4 r6, r7, r9, r10 res., chip, 4.99k, 1/10w, 1% 0603 vishay , crcw06034k99fkea 37 6 r8, r25, r48, r52, r53, r54 res., chip, 49.9k, 1/10w, 1% 0603 vishay , crcw060349k9fkea 38 0 r11, r32 res., chip, opt , 0805 option 39 14 r12, r13, r15, r17, r20, r21, r22, r23, r24, r35, r36, r42, r44, r46 res., chip, 1k, 1/10w, 1% 0603 vishay , crcw06031k00fkea DC2026Cfd demo manual DC2026C
14 parts list item qty reference part description manufacturer / part number 40 1 r14 res., chip, 1meg, 1/16w, 1%, 0402 vishay , crcw04021m00fked 41 1 r16 res., chip, 1meg, 1/10w, 1%, 0603 vishay , crcw06031m00fkea 42 5 r18, r40, r41, r45, r47 res., chip, 10k, 1/10w, 1%, 0603 vishay , crcw060310k0fkea 43 1 r19 res., chip, 86.6k, 1/10w, 1%, 0603 nic, nrc06f8662trf 44 5 r25, r48, r52, r53, r54 res., chip, 49.9k, 1/10w, 1%, 0603 vishay , crcw060349k9fkea, nic, nrc06f4992trf 45 1 r 26 res., chip, 0.20?, 1/4w, 5%, 0805 panasonic , erj-s6sjr20v 46 1 r27 res., chip, 107k, 1/16w, 1%, 0402 vishay , crcw0402107kfked 47 1 r28 res., chip, 475k, 1/16w, 1%, 0402 vishay , crcw0402475kfked 48 1 r29 res., chip, 215k, 1/16w, 1%, 0402 vishay , crcw0402215kfked 49 1 r30 res., chip, 316k, 1/16w, 1%, 0402 vishay , crcw0402316kfked 50 1 r31 res., chip, 100?, 1/10w, 5%, 0603 vishay , crcw0603100rjnea 51 0 r33, r34, r37, r38, r43 res., chip, opt , 0603 option 52 1 r39 res., chip, 0?, 1/10w, 0603 vishay , crcw06030000z0ea 53 1 r49 res., chip, 105k, 1/10w, 1%, 0603 vishay , crcw0603105kfkea 54 1 r50 res., chip, 19.1k, 1/10w, 1%, 0603 vishay , crcw060319k1fkea 55 1 r51 res., chip, 40.2k, 1/10w, 1%, 0603 vishay , crcw060340k2fkea 56 2 r55, r56 res., 49.9?, 1/10w, 1%, 0603 nic, nrc06f49r9trf 57 1 r57 res., 24.9?, 1/10w, 1%, 0603 nic, nrc06f24r9trf 58 1 s1 switch, pushbutton, miniature w rth elektronik, 434111025826 59 1 u1 module, usb transceiver, bga-44 linear tech., ltm 2884cy#pbf 60 1 u2 ic, dc-dc converter, tsot-23 linear tech., lt3461es6#pbf 61 1 u3 ic , ldo micropower regulator , adjustable , tsot-23 linear tech., lt1761es5-sd#pbf 62 1 u4 ic, bus buffer, 2-wire, msop linear tech., ltc4315cms#pbf 63 1 u5 ic, ldo micropower regulator, 3.3v, tsot-23 linear tech., lt1761es5-3.3#pbf 64 1 u6 ic, ideal diode, low loss,tsot-23 linear tech., ltc4411es5#pbf 65 1 u7 ic, microcontroller atmel , atmega328p-au 66 1 u8 ic, ldo micropower regulator , adjustable , tsot-23 linear tech., lt1761es5-byp#pbf 67 1 u9 ic, usb uart, 28-ssop ftdi , ft 232rl-reel 68 1 u10 ic, step-down regulator, ms10 linear tech., lt3973emse#pbf 69 1 u11 ic., single/dual- supply comparator linear tech., lt1719cs6#pbf 70 2 u12, u13 ic, tri- state uhs buffer, us8 fairchild , nc7wz125k8x 71 1 xjp3 shunt, 2mm samtec, 2sn -bk-g 72 1 y1 resonator , 16mhz, smt murata , cstce16m0v53-r0 DC2026Cfd demo manual DC2026C
15 schematic diagram 5 5 4 4 3 3 2 2 1 1 d d c c b b a a ltm2884 analog in norm icsp note: all resistors and capacitors are size 0603 unless otherwise specified. m.hawkins mark thoren opt from u1 digital(pwm~) power sck from j2, page 2 tx rx on io page 2 mux reset trace on bottom side mux linear technology isolated arduino-compatible demonstration board linduino one: 05/29/2015 - production release dc2026b: m.thoren 4/03/2014 01 sku update to DC2026C: added r52-r57 a0 a1 a2 a3 7 ~6 ~5 4 ~3 2 aref ~11 ~9 rx_0 reset tx_1 scl sda aref gnd 13 12 ~11 ~10 ~9 8 7 ~6 ~5 4 ~3 2 tx_1 rx_0 scl sda a3 a2 a1 a0 gnd reset 13 13 sck/scl mosi/sda gpio cs scl sda ~10 12 8 +5v +5v +5v +5v vccio 7v +5v +5v 3v3 +5v +5v +5v vccio vccio +5v vccio +5v +5v vccio vccio +5v vccio vccio vccio diso- diso+ vin size date: ic no. rev. sheet of title: approvals pcb des. app eng. technology fax: (408)434-0507 milpitas, ca 95035 phone: (408)432-1900 1630 mccarthy blvd. ltc confidential-for customer use only customer notice 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. this circuit is proprietary to linear technology and schematic supplied for use with linear technology parts. scale = none www.linear.com 1 demo circuit 2026c 1 2 n/a size date: ic no. rev. sheet of title: approvals pcb des. app eng. technology fax: (408)434-0507 milpitas, ca 95035 phone: (408)432-1900 1630 mccarthy blvd. ltc confidential-for customer use only customer notice 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. this circuit is proprietary to linear technology and schematic supplied for use with linear technology parts. scale = none www.linear.com 1 demo circuit 2026c 1 2 n/a size date: ic no. rev. sheet of title: approvals pcb des. app eng. technology fax: (408)434-0507 milpitas, ca 95035 phone: (408)432-1900 1630 mccarthy blvd. ltc confidential-for customer use only customer notice 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. this circuit is proprietary to linear technology and schematic supplied for use with linear technology parts. scale = none www.linear.com 1 demo circuit 2026c 1 2 n/a revision history description rev revision history description rev revision history description rev r31 100 u7 atmega328p-au pc6 (reset) 29 pb6(xtal1/tosc1) 7 aref 20 gnd 5 gnd 3 avcc 18 gnd 21 pb7(xtal2/tosc2) 8 vcc 4 vcc 6 adc7 22 adc6 19 pdo(rxd) 30 pd1(txd) 31 pd2(int0) 32 pd3(int1) 1 pd4(xck/t0) 2 pd5(t1) 9 pd6(ain0) 10 pd7(ain1) 11 pc0(adc0) 23 pc1(adc1) 24 pc2(adc2) 25 pc3(adc3) 26 pc4(adc4/sda) 27 pc5(adc5/scl) 28 pb0(icp1) 12 pb1(oc1a) 13 pb2(ss/oc1b) 14 pb3(mosi/oc2a) 15 pb4(miso) 16 pb5(sck) 17 r42 1k c21 0.1uf 16v r55 49.9 r41 10k u12-1 nc7wz125k8x 6 8 4 2 1 d5 yellow 2 1 c33 0.1uf r25 49.9k r10 4.99k r6 4.99k c20 0.1uf 16v r9 4.99k s1 r45 10k c28 0.1uf 16v d4 yellow 2 1 r44 1k r16 1 meg d1 yellow 2 1 u13-2 3 8 4 5 7 r18 10k c23 1.0uf 16v r35 1k c34 0.1uf r37 opt r12 1k jp2 1 3 2 j1 v+ 1 gnd 3 miso 5 mosi/sda 7 eesda 9 eescl 11 gnd 13 5v 2 sck/scl 4 cs 6 gnd 8 eevcc 10 eegnd 12 gpio 14 c19 0.1uf 16v c32 0.1uf r34 opt y1 16 mhz 1 3 2 r17 1k r8 49.9k + - u11 lt1719cs6 3 1 5 4 2 6 u9 ft232rl txd 1 rxd 5 rts# 3 cts# 11 dtr# 2 dsr# 9 dcd# 10 ri# 6 cbus0 23 cbus1 22 cbus2 13 cbus3 14 cbus4 12 test 26 gnd 21 gnd 18 gnd 7 agnd 25 vccio 4 vcc 20 usbdm 16 usbdp 15 nc 8 reset# 19 nc 24 osci 27 osco 28 3v3out 17 r36 1k r33 opt r23 1k r39 0 ohm u13-1 nc7wz125k8x 6 8 4 2 1 r21 1k j7 1 2 3 4 5 6 j6 1 2 3 4 5 6 7 8 9 10 r38 opt j4 1 3 5 6 4 2 d2 green 2 1 r46 1k u12-2 3 8 4 5 7 r22 1k r24 1k tp4 1 r13 1k c8 0.1uf r56 49.9 u4 ltc4315cms en 1 gnd 6 ready 7 discen 2 sclout 3 acc 5 sclin 4 fault 8 sdain 9 sdaout 10 vcc2 11 vcc 12 r15 1k tp3 1 r20 1k r7 4.99k r53 49.9k r54 49.9k c25 0.1uf j8 1 2 3 4 5 6 7 8 c18 1.0uf 16v r52 49.9k j3 1 2 3 4 5 6 7 8 r57 24.9 r40 10k q1 vn10lf 1 2 3 r43 opt c22 0.1uf 16v DC2026Cfd demo manual DC2026C
16 schematic diagram 5 5 4 4 3 3 2 2 1 1 d d c c b b a a 3.3v ac adaptor in usb gnd usb usb gnd note: all resistors and capacitors are size 0603 unless otherwise specified. to u9 page 1 to j3, page 1 opt trace on bottom side usb gnd usb gnd output 7.6v @ 100ma 3.3v output 50ma max ac adaptor 5v output 750ma max usb 5v output 200ma max 7v-20v input 5v 3.3v 2.5v ext pcb mechanical parts m.hawkins mark thoren 05/29/2015 linear technology isolated arduino-compatible demonstration board linduino one: ltm2884 7.6v usbd- usbd+ usbvcc usbgnd +5v +5v 3v3 +5v 7v +5v vccio diso+ diso- vin size date: ic no. rev. sheet of title: approvals pcb des. app eng. technology fax: (408)434-0507 milpitas, ca 95035 phone: (408)432-1900 1630 mccarthy blvd. ltc confidential-for customer use only customer notice 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. this circuit is proprietary to linear technology and schematic supplied for use with linear technology parts. scale = none www.linear.com 1 demo circuit 2026c 2 2 n/a size date: ic no. rev. sheet of title: approvals pcb des. app eng. technology fax: (408)434-0507 milpitas, ca 95035 phone: (408)432-1900 1630 mccarthy blvd. ltc confidential-for customer use only customer notice 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. this circuit is proprietary to linear technology and schematic supplied for use with linear technology parts. scale = none www.linear.com 1 demo circuit 2026c 2 2 n/a size date: ic no. rev. sheet of title: approvals pcb des. app eng. technology fax: (408)434-0507 milpitas, ca 95035 phone: (408)432-1900 1630 mccarthy blvd. ltc confidential-for customer use only customer notice 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. this circuit is proprietary to linear technology and schematic supplied for use with linear technology parts. scale = none www.linear.com 1 demo circuit 2026c 2 2 n/a mp1 bumper, adhesive-backed r14 1meg 0402 tp1 1 d3 b2100 2 1 c15 10uf 16v 0805 r28 475k 0402 mp4 bumper, adhesive-backed r11 opt 0805 r32 opt r4 13.7k c9 10uf 16v 0805 r47 10k j5 1 2 3 4 5 6 r3 215k u6 ltc4411es5 gnd 2 stat 4 in 1 vout 5 ctl 3 c14 0.01uf 16v r26 0.20 ohms 0805 1/4w + c26 10uf 50v suncon c12 10uf 16v 0805 c4 1.0uf 16v c24 0.047uf 16v c17 1.0uf 16v mp2 bumper, adhesive-backed c7 4.7uf 16v c16 2.2uf 1206 50v r5 42.2k c27 0.22uf 0402 r50 19.1k u8 lt1761es5-byp gnd 2 byp 3 in 1 vout 5 adj 4 r1 64.9k c10 10pf cog 0402 c11 22uf 1206 u3 lt1761es5-sd gnd 2 shdn 3 in 1 vout 5 adj 4 u5 lt1761es5-3.3 gnd 2 byp 4 in 1 vout 5 shdn 3 jp3 1 3 5 6 4 2 7 8 c31 2.2nf 1kv 1206 c2 0.01uf 16v r30 316k 0402 r2 47.5k c3 10uf 16v 0805 l2 10uh 1 2 j2 2 3 1 mp3 bumper, adhesive-backed tp2 1 r27 107k 0402 r48 49.9k c30 2.2nf 1kv 1206 c6 4.7uf 25v 0805 l1 15uh smt 1 2 r51 40.2k r29 215k 0402 c13 1.0uf 16v c29 opt u10 lt3973ems pg 9 rt 10 boost 7 en/uvlo 3 out 2 gnd 11 gnd 5 vin 4 fb 1 bd 8 sw 6 u2 lt3461es6 sw 1 gnd 2 fb 3 vin 6 shdn 4 vout 5 r49 105k c1 4.7uf 16v r19 86.6k jp1 1 2 c5 15pf u1 ltm2884cy d1+ a2 d1- a1 spnd-pwr a3 on a4 vlo a5 gnd b1 gnd b2 gnd b3 gnd b4 gnd b5 gnd b6 gnd b7 gnd b8 gnd b9 gnd b10 gnd b11 gnd2 k1 gnd2 k2 gnd2 k3 gnd2 k4 gnd2 k5 gnd2 k6 gnd2 k7 gnd2 k8 gnd2 k9 gnd2 k10 gnd2 k11 gnd2 l3 gnd2 l4 gnd2 l6 gnd2 l7 gnd a6 vbus a7 vcc a8 vcc a9 vcc a10 vcc a11 d2- l1 d2+ l2 vlo2 l5 vcc2 l8 vcc2 l9 vcc2 l10 vcc2 l11 DC2026Cfd demo manual DC2026C
17 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. revision history board rev date description page number b 08/14 added circuitry to allow adjustment of vccio voltage and spi/i 2 c logic levels 11, 12 c 06/15 revised board to c, added pull-up resistors to u12, u13 inputs. added source termination resistors to u1, u13 outputs. 13, 14, 15 (revision history begins at rev c of manual) DC2026Cfd demo manual DC2026C
18 linear technology corporation 1630 mccarthy blvd., milpitas, ca 95035-7417 (408) 432-1900 fax : (408) 434-0507 www.linear.com linear technology corporation 2013 lt 0615 rev d ? printed in usa demonstration board important notice linear technology corporation ( lt c ) 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 lt c 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 lt c 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 . lt c assumes no liability for applications assistance, customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind. lt c 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 lt c applica- tion engineer . mailing address: linear technology 1630 mccarthy blvd. milpitas, ca 95035 copyright ? 2004, linear technology corporation DC2026Cfd demo manual DC2026C

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