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AT89C5122D-RDRUM 数据表(PDF) 15 Page - ATMEL Corporation |
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AT89C5122D-RDRUM 数据表(HTML) 15 Page - ATMEL Corporation |
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15 / 208 page  15 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 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 only ESR max : 100 Ω All product versions |
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