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AT90USB646 Datasheet(PDF) 248 Page - ATMEL Corporation |
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AT90USB646 Datasheet(HTML) 248 Page - ATMEL Corporation |
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248 / 434 page  248 7593A–AVR–02/06 AT90USB64/128 Figure 21-1. USB controller Block Diagram overview 21.3 Typical Application Implementation Depending on the USB operating mode (Device only, Reduced Host or OTG mode) and target application power supply, the AT90USB64/128 requires different hardware typical implementations. Figure 21-2. Operating modes versus frequency and power-supply CPU USB Regulator USB Interface PLL 24x clk 2MHz clk 48MHz PLL clock Prescaler On-Chip USB DPRAM DPLL Clock Recovery UCAP D- D+ VBUS UID UVCC AVCC XTAL1 VCC (V) VCC min 0 3.0 3.4 5.5 USB not operationnal USB operationnal without internal regulator USB operationnal with internal regulator 4.5 2.7 Max Operating Frequency (MHz) 8 MHz 16 MHz 2 MHz |
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