5 4 3 2 1 REVISION HISTORY REV +5V J8 5 6 5 1 Y1 16 DISO+ 15 RXD RTS# USBDM CTS# USBDP DTR# DSR# 8 19 24 NC DCD# RESET# RI# NC CBUS0 27 28 CBUS1 OSCI CBUS2 OSCO CBUS3 CBUS4 11 AREF C21 0.1uF 16V C18 1.0uF 16V 2 9 10 20 18 C19 0.1uF 16V 21 3 5 R21 1K 6 4 6 23 C22 0.1uF 16V 22 AREF AVCC PC5(ADC5/SCL) PC4(ADC4/SDA) PC3(ADC3) PC2(ADC2) PC1(ADC1) PC0(ADC0) GND GND GND VCC VCC PD7(AIN1) PD6(AIN0) PD5(T1) PD4(XCK/T0) PD3(INT1) PD2(INT0) PD1(TXD) PDO(RXD) C28 0.1uF 16V 13 22 19 14 ADC7 ADC6 TEST GND A3 A2 A1 A0 R44 1K R43 OPT 2 2 D4 YELLOW J3 A0 A1 A2 A3 SDA SCL R33 1 8 R6 4.99K 2 R10 4.99K +5V R34 OPT R15 1K VCC VCC2 SCLIN SDAIN SCLOUT SDAOUT EN DISCEN ACC READY FAULT 11 R55 49.9 C25 0.1uF 3 10 7 8 4 5 7 6 R56 49.9 SCK/SCL 1 1 10 11 9 12 14 R41 10K VCCIO MOSI/SDA 3 8 13 R9 4.99K TP3 V+ 5V EEVCC EESCL EESDA EEGND GPIO SCK/SCL MISO MOSI/SDA CS B GND GND GND VCCIO TP4 J7 CUSTOMER NOTICE D5 YELLOW 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only APPROVALS LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; TECHNOLOGY HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO PCB DES. M.HAWKINS VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED APP ENG.MARK THOREN TITLE: SCHEMATIC CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT LINDUINO PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. 1 ONE: LINEAR TECHNOLOGY ISOLATED ARDUINO-COMPATIBLE DEMONSTRATION BOARD NOTE: ALL RESISTORS AND CAPACITORS ARE SIZE 0603 UNLESS OTHERWISE SPECIFIED. SIZE IC NO.LTM2884 N/A THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 5 R7 4.99K R40 10K 2 13 IO 7V 1 VCCIO 1 J1 VCCIO VCCIO 1 2 3 4 5 6 OPT Q1 VN10LF 1 12 5 TX 1 3 A 1 2 3 4 5 6 7 8 R22 1K RX SCK 1 R20 1K 1 ON D1 YELLOW 2 2 D2 GREEN R13 1K R57 24.9 R46 1K LTC4315CMS 1 2 +5V ANALOG IN GPIO R42 1K 4 9 +5V R12 1K 3 + 5 GND VIN FROM J2, PAGE 2 CS U4 C32 0.1uF TX_1 RESET 3 +5V R45 10K LT1719CS6 - 3V3 POWER U11 C8 0.1uF RX_0 +5V 5 VCCIO +5V 11 7 10 ~6 9 ~5 2 4 1 ~3 32 2 31 30 U13-2 C +5V R24 1K +5V R35 1K SCL SDA 26 21 GND 28 27 26 25 24 23 12 R23 1K 18 7 AGND C23 1.0uF 16V 25 B 3 MUX R17 1K 8 +5V 5 3V3OUT GND 17 8 7 4 FROM U1 PAGE 2 DISO- VCC 1 GND C TXD 6 R36 1K 4 20 VCCIO R37 VCCIO OPT 6 4 3 C20 0.1uF 16V 13 12 ~11 ~10 ~9 4 FT232RL 29 17 16 15 14 13 12 2 2 PB5(SCK) PC6 (RESET) PB4(MISO) PB3(MOSI/OC2A) PB2(SS/OC1B) PB1(OC1A) PB7(XTAL2/TOSC2) PB0(ICP1) PB6(XTAL1/TOSC1) 6 R16 1 MEG 6 NC7WZ125K8X 2 16 Mhz U9 U12-1 8 7 R54 49.9K 4 R53 49.9K R39 0 OHM 2 3 U7 R52 49.9K U13-1 NC7WZ125K8X 8 U12-2 TRACE ON BOTTOM SIDE +5V C33 0.1uF 8 3 2 1 R25 49.9K R8 49.9K D VCCIO C34 0.1uF RESET ATMEGA328P-AU SKU UPDATE TO DC2026C: ADDED R52-R57 VCCIO DIGITAL(PWM~) NORM 01 R38 OPT +5V JP2 OPT PRODUCTION RELEASE DC2026B: M.THOREN 4/03/2014 1 R18 10K 4 - 4 D 3 J4 ICSP 7 +5V R31 100 2 8 7 6 5 4 3 2 1 RESET SCL SDA AREF GND 13 12 ~11 ~10 ~9 8 MUX S1 1 7 ~6 ~5 4 ~3 2 TX_1 RX_0 10 9 8 7 6 5 4 3 2 1 J6 DESCRIPTION 4 3 SCALE = NONE 2 REV. 1 DEMO CIRCUIT 2026C DATE: 05/29/2015 SHEET 1 1 OF 2 A 5 4 U8 L2 10uH 2 LT3461ES6 4 R2 47.5K SHDN SW VOUT FB R3 215K 3 C5 15pF C1 4.7uF 16V C6 4.7uF 25V 0805 C3 10uF 16V 0805 R1 64.9K 4 ADJ 3 BYP C2 0.01uF 16V D 2 D VIN 7.6V 5 5 IN GND C4 1.0uF 16V 7V VOUT 1 OUTPUT 7.6V @ 100mA GND 6 1 LT1761ES5-BYP U2 1 +5V 2 2 1 3 R4 13.7K C24 0.047uF 16V U3 R5 42.2K LT1761ES5-SD JP1 VCCIO OPT 1 USB 5V OUTPUT 200mA MAX 2 +5V USB GND C30 2.2nF1kV 1206 2 B2100 1 C13 1.0uF 16V C31 2.2nF1kV 1206 7 5 IN 3 VOUT SHDN GND 8 6 1 BYP 5 3.3V 4 C14 0.01uF 16V C15 10uF 16V 0805 U10 LT3973EMS + C26 10uF 50V SUNCON C16 2.2uF TP2 1 1206 50V AC ADAPTOR 5V OUTPUT 750mA MAX 4 9 3 2 5 VIN PG EN/UVLO OUT GND SW BOOST BD FB RT 6 7 8 1 10 C27 0.22uF 0402 L1 15uH SMT +5V B R28 475K 0402 R29 215K 0402 R14 1MEG 0402 R27 107K 0402 VIN C10 10pF COG 0402 C11 22uF 1206 R30 316K 0402 TO J3, PAGE 1 CUSTOMER NOTICE 7V-20V INPUT 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only APPROVALS LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; TECHNOLOGY HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO PCB DES. M.HAWKINS VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED APP ENG.MARK THOREN TITLE: SCHEMATIC CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT LINDUINO PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. PCB MECHANICAL PARTS MP1 BUMPER, ADHESIVE-BACKED NOTE: ALL RESISTORS AND CAPACITORS ARE MP2 BUMPER, ADHESIVE-BACKED SIZE 0603 UNLESS OTHERWISE SPECIFIED. MP3 BUMPER, ADHESIVE-BACKED MP4 BUMPER, ADHESIVE-BACKED ONE: LINEAR TECHNOLOGY ISOLATED ARDUINO-COMPATIBLE DEMONSTRATION BOARD SIZE IC NO.LTM2884 N/A THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 5 C 2 R26 0.20 OHMS 0805 D3 1/4W J2 1 3 2 3V3 LT1761ES5-3.3 1 GND GND GND GND GND GND GND GND GND GND GND GND L3 L4 L6 L7 K1 K2 K3 K4 K5 K6 K7 K8 K9 K10 K11 3.3V OUTPUT 50mA MAX U5 SPND-PWR USB GND A R50 19.1K ON B AC ADAPTOR IN R19 R51 86.6K 40.2K JP3 GND2 GND2 GND2 GND2 GND2 GND2 GND2 GND2 GND2 GND2 GND2 GND2 GND2 GND2 GND2 TRACE ON BOTTOM SIDE 2 USB GND TO U9 PAGE 1 STAT C12 10uF 16V 0805 TP1 4 DISO- CTL 4 1 VLO C29 OPT A6 B1 B2 B3 B4 B5 B6 B7 B8 B9 B10 B11 DISO+ 3 C9 10uF 16V 0805 5V R32 OPT L2 L1 C17 1.0uF 16V ADJ 5 3.3V A3 D2+ D2- VOUT 3 A4 D1+ D1- IN 2 A5 USB GND VLO2 LTM2884CY 1 L5 1 A2 A1 VBUS U1 R48 49.9K 4 2 R49 105K EXT 2.5V A7 +5V LTC4411ES5 GND USBVCC USBDUSBD+ USBGND U6 R11 OPT 0805 L11 L10 L9 L8 11 C 1 2 3 4 5 6 VCC2 VCC2 VCC2 VCC2 GND USB VCC VCC VCC VCC SHDN 1 2 A11 A10 A9 A8 J5 R47 10K 3 5 VOUT GND C7 16V 4.7uF IN 4 3 SCALE = NONE 2 REV. 1 DEMO CIRCUIT 2026C DATE: 05/29/2015 SHEET 1 2 OF 2 A