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AT90USB646 датащи(PDF) 60 Page - ATMEL Corporation

номер детали AT90USB646
подробное описание детали  8-bit Atmel Microcontroller with 64/128Kbytes of ISP Flash and USB Controller
PDF  456 Pages
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производитель  ATMEL [ATMEL Corporation]
домашняя страница  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT90USB646 датащи(HTML) 60 Page - ATMEL Corporation

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60
7593L–AVR–09/12
AT90USB64/128
Figure 9-4.
External reset during operation.
9.5
Brown-out detection
Atmel AT90USB64/128 has an on-chip Brown-out Detection (BOD) circuit for monitoring the V
CC
level during operation by comparing it to a fixed trigger level. The trigger level for the BOD can
be selected by the BODLEVEL Fuses. The trigger level has a hysteresis to ensure spike free
Brown-out Detection. The hysteresis on the detection level should be interpreted as V
BOT+ =
V
BOT + VHYST/2 and VBOT- = VBOT - VHYST/2.
When the BOD is enabled, and V
CC decreases to a value below the trigger level (VBOT- in Figure
9-5 on page 61), the Brown-out Reset is immediately activated. When V
CC increases above the
trigger level (V
BOT+ in Figure 9-5 on page 61), the delay counter starts the MCU after the Time-
out period t
TOUT has expired.
The BOD circuit will only detect a drop in V
CC if the voltage stays below the trigger level for lon-
ger than t
BOD given in Table 9-1 on page 58.
CC
Table 9-2.
BODLEVEL fuse coding.
BODLEVEL 2..0 Fuses
Min. VBOT
Typ. VBOT
Max. VBOT
Units
111
BOD disabled
110
Reserved
101
100
011
2.4
2.6
2.8
V
010
3.2
3.4
3.6
001
3.3
3.5
3.7
000
4.1
4.3
4.5
Table 9-3.
Brown-out characteristics.
Symbol
Parameter
Min.
Typ.
Max.
Units
V
HYST
Brown-out detector hysteresis
50
mV
tBOD
Min. pulse width on brown-out reset
ns
IBOD
Brown-out detector consumption
25
µA



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