AT83C5123XXX-RATUM Ver la hoja de datos (PDF) - Atmel Corporation

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componentes Descripción

Fabricante

AT83C5123XXX-RATUM

C51 Microcontroller with USB and Smart Card Reader Interfaces

Atmel Corporation 

AT83R5122, AT8xC5122/23

Typical Applications

Recommended External components

All the external components described in the figure and table below must be imple-

mented as close as possible from the microcontroller package.

Table 3. External Components Bill Of Materials

Reference Description

Value

Comments

R1 USB Full Speed Pull-up

1.5 KΩ +/-10%

All product versions

R2 USB pad serial resistor

27 Ω +/-10%

33 Ω +/-10%

For AT8xC5122 versions

For AT83C5123 versions

R3 USB pad serial resistor

27 Ω +/-10%

33 Ω +/-10%

For AT8xC5122 versions

For AT83C5123 versions

R4 PLL filter resistor

1.8 KΩ +/-10%

All product versions

R5 CIO Pull-up resistor

10 KΩ +/10%

All product versions

C1 Power Supply filter capacitor

100 nF +80/-20%

All product versions

C2 PLL filter capacitor

33 pF +/-10%

All product versions

C3 PLL filter capacitor

150 pF +/-10%

All product versions

C4 USB pad decoupling capacitor

680 nF +/-30%

All product versions.

If USB interface is not used, this capacitor is optional

C5 Smart Card clock filter capacitor

27 pF +/-10%

All product versions.

10 μF +/-10%

C6 DC/DC Converter decoupling capacitor

Low ESR

All product versions.

This capacitor does not impact the USB Inrush Current

C7 DC/DC Converter filter capacitor

100 nF +80/-20%

All product versions

C8 Power Supply decoupling capacitor

4.7 μF +/-10%

All products versions

This capacitor impacts the USB Inrush Current. Maximum

application capacitance allowed by the USB standard is 10 μF.

C9 Power Supply filter capacitor

100 nF +80/-20C

All product versions

C10 Reset capacitor

10 μF +/-10%

Optional capacitor for all product versions

L1 DC/DC converter input inductance

10 μH +/- 10%

Min rated current : 200 mA

Min rated freq. : 4 MHz

All product versions.

Qualified component : Murata LQH32CN100K21L

If DC/DC converter is not used at 5V, this inductance is optional.

Q1 Crystal

8.0000 Mhz +/- 2500 ppm

only

ESR max : 100 Ω

All product versions

15

4202F–SCR–07/2008

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