Rainbow-electronics AT89C5122 Instrukcja Użytkownika Pobierz pdf (Strona 17)

AT8xC5122/23

4202E–SCR–06/06

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% For AT8xC5122 versions

33 Ω +/-10% For AT83C5123 versions

R3 USB pad serial resistor

27 Ω +/-10% For AT8xC5122 versions

33 Ω +/-10% 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.

C6 DC/DC Converter decoupling capacitor

10 µF +/-10%

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

max

ESR max : 100 Ω

All product versions

1 2 ... 12 13 14 15 16 17 18 19 20 21 22 ... 212 213

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