Rainbow Electronics AT89C5122 - Manual (Page 17)

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 K Ω +/-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 K Ω +/-10% All product versions
R5 CIO Pull-up resistor 10 K Ω +/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