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ATtiny25 датащи(PDF) 38 Page - ATMEL Corporation

номер детали ATtiny25
подробное описание детали  8-bit Microcontroller with 2/4/8K Bytes In-System Programmable Flash
PDF  196 Pages
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производитель  ATMEL [ATMEL Corporation]
домашняя страница  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATtiny25 датащи(HTML) 38 Page - ATMEL Corporation

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38
7598H–AVR–07/09
ATtiny25/45/85
Figure 8-4.
External Reset During Operation
8.5
Brown-out Detection
ATtiny25/45/85 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.
Note:
1. V
BOT may be below nominal minimum operating voltage for some devices. For devices where
this is the case, the device is tested down to VCC = VBOT during the production test. This guar-
antees that a Brown-out Reset will occur before V
CC drops to a voltage where correct
operation of the microcontroller is no longer guaranteed.
2. Centered value, not tested.
Notes:
1. This is the limit to which VDD can be lowered without losing RAM data
CC
Table 8-2.
BODLEVEL Fuse Coding(1)
BODLEVEL [2..0] Fuses
Min V
BOT
Typ V
BOT
Max V
BOT
Units
111
BOD Disabled
110
1.7
1.8
2.0
V
101
2.5
2.7
2.9
100
4.0
4.3
4.6
011
2.3
(2)
010
2.2
(2)
001
1.9
(2)
000
2.0
(2)
Table 8-3.
Brown-out Characteristics
Symbol
Parameter
Min
Typ
Max
Units
V
RAM
RAM Retention Voltage
(1)
50
mV
VHYST
Brown-out Detector Hysteresis
50
mV
tBOD
Min Pulse Width on Brown-out Reset
2
µs



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