Atmel AVR XMEGA E Application Note Download Page 1

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APPLICATION NOTE

Atmel AT01080: XMEGA E Schematic Checklist

Atmel AVR XMEGA E

Features

•

Power supplies

•

Reset circuit

•

Clocks and crystal oscillators

•

PDI

•

TWI

Introduction

This application note describes a common checklist which should be used when
starting and reviewing the schematics for an Atmel

AVR

XMEGA

E design.

42087A

−

AVR

−

04/2013

Summary of Contents for AVR XMEGA E

Page 1: ...VR XMEGA E Features Power supplies Reset circuit Clocks and crystal oscillators PDI TWI Introduction This application note describes a common checklist which should be used when starting and reviewing...

Page 2: ...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 oscillator 6 3 3 Real time...

Page 3: ...to 3 6V Decoupling filtering capacitors 100nF 1 2 and 10 F 1 Ferrite bead 4 prevents the VCC noise interfering the AVCC Analog supply voltage GND Ground Notes 1 These values are given only as a typic...

Page 4: ...ble 1 2 External analog reference checklist Signal name Recommended pin connection Description AREFA 1 0V to AVCC 0 6V for ADC Decoupling filtering capacitors 100nF 1 2 and 4 7 F 1 External reference...

Page 5: ...moved The pull down resistor prevents from overvoltage on the RESET pin when the switch is pressed Any reset capacitors should be removed if PDI programming and debugging is used Other external reset...

Page 6: ...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 crystal s equivalent series resistance ESR...

Page 7: ...stal 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 TOSC2 Load capacitor 18pF 1 2 T...

Page 8: ...erface checklist Signal name Recommended pin connection Description PDI_CLK This pull up resistor makes sure that reset does not go low unintended When the PDI programming and debugging is used the re...

Page 9: ...Rp will depend on the SCL frequency fSCL 100kHz fSCL 400kHz fSCL 1MHz Refer to chapter Two wire interface characteristics in the datasheet for choosing the right value SCL serial clock line SDA This p...

Page 10: ...Atmel AT01080 XMEGA E Schematic Checklist APPLICATION NOTE 42087A AVR 04 2013 10 7 Revision History Doc Rev Date Comments 42087A 04 2013 Initial document release...

Page 11: ...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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