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DOC7707 датащи(PDF) 187 Page - List of Unclassifed Manufacturers

номер детали DOC7707
подробное описание детали  Microcontroller with 8/16K Bytes of ISP Flash and USB Controller
PDF  307 Pages
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производитель  ETC1 [List of Unclassifed Manufacturers]
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DOC7707 датащи(HTML) 187 Page - List of Unclassifed Manufacturers

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187
7707F–AVR–11/10
AT90USB82/162
19.3.3
Design guidelines
• Serial resistors on USB Data lines must have 22 Ohms value (+/- 5%).
• Traces from the input USB receptable (or from the cable connection in the case of a tethered
device) to the USB microcontroller pads should be as short as possibles, and follow
differential traces routing rules (same length, as near as possible, avoid vias accumulation).
• Voltage transcient / ESD suppressors may also be used to prevent USB pads to be damaged
by external disturbances.
•U
cap capacitor should be 1µF (+/- 10%) for correct operation.
• A 10µF capacitor is highly recommended on VBUS line
19.4
General Operating Modes
19.4.1
Introduction
The USB controller is disabled and reset after a hardware reset generated by:
– Power on reset
– External reset
– Watchdog reset
– Brown out reset
– debugWIRE reset
But another available and optionnal reset source is :
– USB End Of Reset
In this case, the USB controller is reset, but not disabled (so that the device remains attached).
19.4.2
Power-on and reset
The next diagram explains the USB controller main states on power-on:
Figure 19-7. USB controller states after reset
When the USB controller is in reset state:
• USBE is not set
Dev ice
Reset
USBE=0
<anyother
state>
USBE=1
Clockstopped
FRZCLK=1
Macrooff
USBE=0
USBE=0
HWRESET
(exceptedfromEOR)
HW RESET from EOR



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