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APPLICATION NOTE

Atmel AT01607: XMEGA C Schematic Checklist

8-bit Atmel Microcontrollers

Features

•

Power supplies

•

Reset circuit

•

Clocks and crystal oscillators

•

PDI

•

USB

Introduction

This application note describes a common checklist which should be used when

starting and reviewing the schematics for an Atmel

®

AVR

®

XMEGA

®

C design.

8466A

−

AVR

−

06/2013

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2
3
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Summary of Contents for AT01607

Page 1: ...Microcontrollers Features Power supplies Reset circuit Clocks and crystal oscillators PDI USB Introduction This application note describes a common checklist which should be used when starting and rev...

Page 2: ...wer supplies 3 1 1 Power supply connections 3 1 2 External analog reference connections 4 2 External reset circuit 4 3 Clocks and crystal oscillators 5 3 1 External clock source 5 3 2 Crystal oscillat...

Page 3: ...0nF 1 2 and 10 F 1 Decoupling filtering inductor 10 H 1 3 Digital supply voltage AVCC 1 6V to 3 6V Decoupling filtering capacitors 100nF 1 2 and 10 F 1 Ferrite bead 4 prevents the VCC noise interferin...

Page 4: ...REF schematic EXTERNAL REFERENCE 1 4 7 F 100nF Close to device AGND AREFA Close to power supply Table 1 2 External analog reference checklist Signal name Recommended pin connection Description AREFA 1...

Page 5: ...is used as clock The reset pull up should be 10k or weaker or be removed The pull down resistor prevents from overvoltage on the RESET pin when the switch is pressed Any reset capacitors should be re...

Page 6: ...ose to the device and crystal pins 3 3 Real time oscillator The low frequency crystal oscillator is optimized for use with a 32 768kHz watch crystal When selecting crystals load capacitance and crysta...

Page 7: ...crystal please consult the crystal datasheet Table 3 4 External real time oscillator checklist Signal name Recommended pin connection Description TOSC1 Load capacitor 18pF 1 2 Timer oscillator pin 1...

Page 8: ...Atmel AVR JTAGICE 3 and Atmel AVR ONE Table 4 1 PDI port interface checklist Signal name Recommended pin connection Description PDI_CLK This pull up resistor makes sure that reset does not go low unin...

Page 9: ...To ensure proper signal integrity the two D D signals must be closely routed on the PCB Refer to AVR1017 XMEGA USB Hardware Design Recommendations application note Figure 5 1 Low cost USB interface e...

Page 10: ...th the same characteristics length width number of vias etc Signals should be routed as parallel as possible with a minimum number of angles and vias USB full speed low speed positive data upstream pi...

Page 11: ...Atmel AT01607 XMEGA C Schematic ChecklistAtmel AT01607 XMEGA C Schematic Checklist APPLICATION NOTE 8466A AVR 06 2013 11 7 Revision History Doc Rev Date Comments 8466A 06 2013 Initial document release...

Page 12: ...mel products EXCEPT AS SET FORTH IN THE ATMEL TERMS AND CONDITIONS OF SALES LOCATED ON THE ATMEL WEBSITE ATMEL ASSUMES NO LIABILITY WHATSOEVER AND DISCLAIMS ANY EXPRESS IMPLIED OR STATUTORY WARRANTY R...

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