17

TPR0441BX–SMS–09/09

ATVaultIC460

The resonator must be placed as close as possible to the ATVaultIC460 chip.

The oscillator terminals shall not be used to drive other circuits.

In order to have the right resonator load capacitance, external capacitors must be connected on

XIN and XOUT pins. For a given resonator, manufacturer specify a load capacitor value to add

in parallel with the component. For a set of 2 caps connected between each oscillator terminal

and ground, each of them should be equal to twice the specified load capacitance.

Figure 3-7.

External load capacitor

ber CSTCW48M0X11Mxx-R0 (thin resonator for Smart Card) or CSTCZ48M0X11Rxx-R0 (small

resonator for any system). This ceramic resonator hosts built-in capacitance in a small mono-

lithic chip type. Its electrical properties best fit the Atmel specifications.

3.5.2

Building a USB Token

A USB reference design is available for the ATVaultIC460 chip. Atmel offers a complete soft-

ware and hardware solution based on a full USB communication stack, an ICCD compliant

library and a USB dongle as target. The TPR0278 application note USB ICCD Implementation

describes how to build a USB-ICC and how to implement an application based on the USB ICCD

class.

Ton

Startup time

1

ms

Pon

Drive level

500

μW

ESR

Equivalent Serie Resistance

@ 48Mhz

70

Ω

Cm

Motional capacitance

@ 48MHz

10

200

fF

Cshunt

Shunt capacitance

6.2

pF

Cload

Load capacitance

Max external capacitors: 12pF

2

6

pF

Idd stdby Standby current consumption

1

μA

Code

Parameter

Condition

Min.

Typ.

Max.

Unit

XIN

XOUT

Cload

XIN

XOUT

2*Cload

2*Cload