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Atmel AT01080: XMEGA E Schematic Checklist
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
APPLICATION NOTE
Atmel AVR XMEGA E
®
®
®
AVR
XMEGA
E design.
42087A−AVR−04/2013
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Table of Contents
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Summary of Contents for Atmel AVR XMEGA E
- Page 1 Power supplies • Reset circuit • Clocks and crystal oscillators • • Introduction This application note describes a common checklist which should be used when ® ® ® starting and reviewing the schematics for an Atmel XMEGA E design. 42087A−AVR−04/2013...
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Page 2: Table Of Contents
Real-time oscillator .................... 6 4. PDI Interface ..................8 5. TWI Interface ..................9 6. Suggested Reading ................9 Datasheets and manual ..................9 7. Revision History ................. 10 Atmel AT01080: XMEGA E Schematic Checklist [APPLICATION NOTE] 42087A−AVR−04/2013... -
Page 3: Power Supplies
The BEAD should provide enough impedance (for example, 220Ω at 100MHz, rated current 200mA, that is, Murata BLM15BB221SN1D) for separating the digital power to the analog power. Atmel AT01080: XMEGA E Schematic Checklist [APPLICATION NOTE] 42087A−AVR−04/2013... -
Page 4: External Analog Reference Connections
External analog reference connections Atmel AVR XMEGA E proposes one ADC using internal references or an external analog reference (AREFA on PORTA or AREFD on PORTD). The following schematic checklist is only recommended if the design is using the external analog reference. If the internal reference is used, the circuit is not necessary. -
Page 5: Clocks And Crystal Oscillators
PORT R pin 1 XTAL2 Can be left unconnected or used as GPIO EXTCLK: input for external clock signal on PC4 is used as input for an external clock signal PORT C pin 4 Atmel AT01080: XMEGA E Schematic Checklist [APPLICATION NOTE] 42087A−AVR−04/2013... -
Page 6: Crystal Oscillator
ESR must be taken into consideration. Both values are specified by the crystal vendor. The Atmel AVR XMEGA E oscillator is optimized for very low power consumption, and thus when selecting crystals, Table 3-3 for maximum ESR recommendations on 9pF and 12.5pF crystals. - Page 7 “AVR1003: Using the XMEGA Clock System” and “AVR4100: Selecting and testing 32kHz crystal oscillators for Atmel AVR microcontrollers”. Load capacitors should be placed close to the crystal, GND and device oscillator pins.
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Page 8: Pdi Interface
PDI Interface Figure 4-1. PDI interface example schematic. The connector pinout that is shown in Figure 4-1 mates with Atmel tools like the Atmel AVR JTAGICE3 and Atmel AVR ONE! Table 4-1. PDI port interface checklist. Signal name Recommended pin connection... -
Page 9: Twi Interface
The datasheet and the manual contain block diagrams of the peripherals and details about implementing firmware for the device. The datasheet and the manual are available on http://www.atmel.com/AVR in the Datasheets and Manuals section. Atmel AT01080: XMEGA E Schematic Checklist [APPLICATION NOTE] 42087A−AVR−04/2013... -
Page 10: Revision History
Revision History Doc. Rev. Date Comments 42087A 04/2013 Initial document release Atmel AT01080: XMEGA E Schematic Checklist [APPLICATION NOTE] 42087A−AVR−04/2013... - Page 11 Corporation or its subsidiaries. Other terms and product names may be trademarks of others. Disclaimer: The information in this document is provided in connection with Atmel products. No license, express or implied, by estoppel or otherwise, to any intellectual property right is granted by this document or in connection with the sale of Atmel products.