AT89C5122D-RDRUM datasheet(15/208 Pages) ATMEL

15 / 208 page

AT83R5122, AT8xC5122/23

4202F–SCR–07/2008

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

USB Full Speed Pull-up

1.5 K

Ω +/-10%

All product versions

USB pad serial resistor

Ω +/-10%

For AT8xC5122 versions

Ω +/-10%

For AT83C5123 versions

USB pad serial resistor

Ω +/-10%

For AT8xC5122 versions

Ω +/-10%

For AT83C5123 versions

PLL filter resistor

1.8 K

Ω +/-10%

All product versions

CIO Pull-up resistor

10 K

Ω +/10%

All product versions

Power Supply filter capacitor

100 nF +80/-20%

All product versions

PLL filter capacitor

33 pF +/-10%

All product versions

PLL filter capacitor

150 pF +/-10%

All product versions

USB pad decoupling capacitor

680 nF +/-30%

All product versions.

If USB interface is not used, this capacitor is optional

Smart Card clock filter capacitor

27 pF +/-10%

All product versions.

DC/DC Converter decoupling capacitor

10 μF +/-10%

Low ESR

All product versions.

This capacitor does not impact the USB Inrush Current

DC/DC Converter filter capacitor

100 nF +80/-20%

All product versions

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.

Power Supply filter capacitor

100 nF +80/-20C

All product versions

C10

Reset capacitor

10 μF +/-10%

Optional capacitor for all product versions

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.

Crystal

8.0000 Mhz +/- 2500 ppm

only

ESR max : 100

All product versions

AT89C5122D-RDRUM Datasheet(PDF) 15 Page - ATMEL Corporation

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