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STK526 데이터시트(PDF) 13 Page - ATMEL Corporation

부품명 STK526
상세설명  AT90USB82/162 TQFP device (2.7V
PDF  40 Pages
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제조업체  ATMEL [ATMEL Corporation]
홈페이지  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

STK526 데이터시트(HTML) 13 Page - ATMEL Corporation

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Using the STK526
2-12
STK526 rev. B Hardware User Guide
7709B–AVR–07/08
VBUS Detection The board also implements a VBUS detection on a generic I/O. A low-power (50µA)
voltage divider (/2) is connected from VBUS to PortC bit 2 pin. The VBUS presence is
detected with a high level on the MCU pin.
VBUS Power Source Moreover, even if not selected as primary power source, VBUS powers the on-board
3.3V regulator (through a diode to avoid current being supplied to USB Host) in order to
get 3V3 voltage in any condition (this allows to power the dataflash at any time, or to
allow a USB Bus-powered operation with all the board at 3.3V.
However, this feature can make current flowing from VBUS to some board peripherals
even if an alternate power source is used to power the board. That may lead to
unwanted extra-consumption, so it can be disabled by cutting the configuration pad.
Figure 2-10 . Configuration Pad Location
Note:
See Section “Configuration Pads”, page 24 for details.



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