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Download AT91 ARM Thumb Microcontrollers Application Note
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6. Example of USB Host connection: A termination serial resistor (REXT) must be connected to HDPA/HDPB and HDMA/HDMB. A recommended resistor value is defined in the electrical specifications of the AT91RM9200 datasheet. 5V Type A Connector 10µF HDMA or HDMB 100nF 10nF REXT HDPA or HDPB REXT 15K 15K 7. Example of USB Device connection: Pull-up is active by default after reset (required by the boot application). No pull-down: DM is floating when the peripheral is not connected. The application shall monitor VBus and remove the pull-up when the host switch off. PIOy 15 K 5V Bus Monitoring 22K 3V3 PIOx USB Pull-up Active 1K5 1.5K 33 pF 27 R DDM 2 1 10µF DDP 27 R 15pF 10 3 Type B 4 Connector 15pF Application Note 6323A–ATARM–03-Jul-07
