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Board Hardware
FIGURE 2-1:
PIC18F46J50 FULL-SPEED USB DEMONSTRATION BOARD
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8
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Full schematics of the PIC18F46J50 Full-Speed USB Demonstration Board are in
Appendix B. “Board Schematics” .
2.1
POWER MANAGEMENT
The USB interface provides +5V (nominal) power at up to 500 mA for use by USB
peripheral devices. In order to take advantage of this bus provided power, a 3.3V, low
dropout, low quiescent current linear regulator (TC1108-3.3VDB) has been included on
the board. This enables the board to operate fully from USB bus power.
All USB compliant, bus-powered devices should implement a low-power, USB
Suspend mode. This is because the USB host may, at its own discretion, halt all USB
traffic – including Start-of-Frame packets – to a USB peripheral device for more than
3 ms. When a peripheral device detects this condition, it should drop to a low-power
suspend state, so it draws no more than 2.5 mA from the +5V V BUS supply pin.
Two USB interrupts: IDLEIF (UIR<4>) and ACTVIF (UIR<2>) are useful in detecting
when the low-power suspend condition should begin and when it actually ends.
? 2009 Microchip Technology Inc.
DS51806A-page 10
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