Arduino uno-schematic reference design
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This document contains a schematic diagram for an Arduino Uno reference design board. It shows the microcontroller, voltage regulators, oscillators, USB interface, I/O pins, and other components that make up the board. Arduino provides these reference designs to customers but does not guarantee their functionality or suitability for any purpose. The designs are subject to change without notice.
Arduino uno-schematic reference design
- 1. ATMEGA8 ICSP +5V GND +5V +5V GND GND GND +5V GND 100n GND 47u 47u GND GND GND GND GREEN GND +5V YELLOW YELLOW M7 GND MC33269D-5.0 MC33269ST-5.0T3 100n GND 500mA +5V +5V 100n GND YELLOW GND FDN304V +5VLM358D LM358D GNDGND +5V 100n +5V ATMEGA8U2-MU GND 100n ICSP +5V GND GND 16MHz 16MHz GND PGB1010604 PGB1010604 BLM21 1M 1K 1K 1K 1K GND 10K 10K 10K 10K 100n 1u 1K 1K 1K 1K 22R 22R 22R 22R 1u 1M 16MHz 16MHz TS42 22p22p 22p22p GND GND GND 27R (ADC5)PC5 28 (ADC4)PC4 27 (ADC3)PC3 26 (ADC2)PC2 25 (ADC1)PC1 24 (ADC0)PC0) 23 (SCK)PB5 19 (MISO)PB4 18 (MOSI)PB3 17 (SS)PB2 16 (OC1)PB1 15 (ICP)PB0 14 (AIN1)PD7 13 (AIN0)PD6 12 (T1)PD5 11 (T0)PD4 6 (INT1)PD3 5 (INT0)PD2 4 (TXD)PD1 3 (RXD)PD0 2 GND 8 VCC 7 AVCC 20 AREF 21 XTAL1 9 XTAL2 10 RESET 1 AGND 22 ZIC1 1 2 3 4 5 6 ICSP 1 2 3 4 5 6 7 8 IOL 1 2 3 4 5 6 7 8 IOH 1 2 3 4 5 6 AD C2PC1 PC2 ON RX TX D1 1 1 2 2 3 3 1 2 3 4 P$1 P$1 P$2 P$2 X2 VI 3 1 VO 2 IC2 ADJ 1 IN 3 OUT 4 2 IC1 1 2 3 4 5 6 POWER C4 F1 C7 L T1 2 3 1 U1A 6 5 7 U1B 84 C1 (PCINT9/OC1B)PC5 25 (PCINT10)PC4 26 (INT4/ICP1/CLK0)PC7 22 (OC1A/PCINT8)PC6 23 (AIN2/PCINT11)PC2 5 (PCINT5)PB5 19 (T1/PCINT4)PB4 18 (PD0/MISO/PCINT3)PB3 17 (PDI/MOSI/PCINT2)PB2 16 (SCLK/PCINT1)PB1 15 (SS/PCINT0)PB0 14 (CTS/HWB/AIN6/TO/INT7)PD7 13 (RTS/AIN5/INT6)PD6 12 (XCK/AIN4/PCINT12)PD5 11 (INT5/AIN3)PD4 10 (TXD1/INT3)PD3 9 (RXD1/AIN1/INT2)PD2 8 (AIN0/INT1)PD1 7 (OC0B/INT0)PD0 6 GND 3 VCC 4 AVCC 32 UVCC 31 XTAL1 1 XTAL2(PC0) 2 RESET(PC1/DW) 24 UGND 28 U3 PAD EXP UCAP 27 D- 30 D+ 29 (PCINT6)PB6 20 (PCINT7/OC0A/OC1C)PB7 21 C5 1 2 3 4 5 6 ICSP1 Y2Y1 21 UBOOT Z1 Z2 2 1 GROUND L1 21 RESET-EN R2 18 RN2A 27 RN2B 36 RN2C 45 RN2D 18RN1A27 RN1B 36RN1C 45 RN1D C6 C8 18 RN4A 27 RN4B 3 6 RN4C 4 5 RN4D 18 RN3A 2 7 RN3B 3 6 RN3C 45 RN3D C3 R1 21 Q1 21 Q2 13 42 RESET 5 C10C12 C9C11 IN 1 EN 3 NC/FB 4 OUT 5 GND 2 R3 +5V +5V GND AREF AREF RESET RESET VIN VIN VIN M8RXD M8RXD M8TXD M8TXD SCK PWRIN D- D+ +3V3 +3V3 +3V3 MISO MOSI SS SS DTR GATE_CMD CMP USBVCC USBVCC USBVCC XTAL2 XTAL2 XTAL1 XTAL1 VUCAP RD- RD- RD+ RD+ RESET2 MISO2 MOSI2 SCK2 USHIELD UGND UGND XUSB XT2 XT2 XT1 XT1 RXLED TXLED AD0 AD1 AD2 AD3 AD4 AD5 IO2 IO1 IO0 IO3 IO4 IO5 IO6 IO7 IO8 IO9XT1R + + USB 0 1 2 3 4 5 6 7 8 9 10 11 12 13 Arduino UNO Reference Design USB boot En TM Reference Designs ARE PROVIDED "AS IS" AND "WITH ALL FAULTS". Arduino DISCLAIMS ALL OTHER WARRANTIES, EXPRESS OR IMPLIED, Arduino may make changes to specifications and product descriptions at any time, without notice. The Customer must not REGARDING PRODUCTS, INCLUDING BUT NOT LIMITED TO, ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE rely on the absence or characteristics of any features or instructions marked "reserved" or "undefined." Arduino reserves these for future definition and shall have no responsibility whatsoever for conflicts or incompatibilities arising from future changes to them. The product information on the Web Site or Materials is subject to change without notice. Do not finalize a design with this information.