AVR16EB32 datasheet(21/46 Pages) MICROCHIP

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AVR16EB32 Curiosity Nano

Hardware Implementation

User Guide

DS50003605B - 21

Hardware Implementation

LED, Mechanical Switch, Power Supply

4.1

Crystal

The AVR16EB32 Curiosity Nano Board has a 32.768 kHz crystal footprint made for standard 3.2 mm

by 1.5 mm surface mount crystals with two terminals. The crystal footprint is not connected to the

AVR16EB32 by default, as the GPIOs are routed to the edge connector.

Figure 4-1. 32.768 kHz Crystal Block Diagram

XTAL32K1

AVR16EB32

MCU

Edge Connector

"PA1"

"PA0"

U100

XTAL32K2

32.768 kHz

Crystall Footprint

PA1

PA0

J108

J107

J110

J111

Y100

J109

Table 4-1. Crystal Connections

AVR16EB32 Pin

Function

Shared Functionality

PA0

XTAL32K1

Edge connector

PA1

XTAL32K2

Edge connector

Some hardware modifications are required to use a crystal with the AVR16EB32.

• The two I/O lines routed to the edge connector must be disconnected to reduce the chance of

contention to the crystal and to remove excessive capacitance on the lines

• Disconnect the edge connector by cutting the two cut straps on the bottom side of the board,

J107 and J108. Marked PA0 and PA1 in the silkscreen

• Connect the crystal by soldering on a solder blob on each circular solder point next to the crystal

on the top side of the board, J109 and J110

• Add suitable capacitors to C104 and C105

• Add a suitable series resistor to R100

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