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AT90SCR100 데이터시트(PDF) 54 Page - ATMEL Corporation

부품명 AT90SCR100
상세설명  8-bit Microcontroller for Smart Card Readers
PDF  433 Pages
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제조업체  ATMEL [ATMEL Corporation]
홈페이지  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT90SCR100 데이터시트(HTML) 54 Page - ATMEL Corporation

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54
TPR0327AY–SMS–30Jan09
AT90SCR100
Figure 9-4.
External Reset During Operation
9.2.3
Brown-out Detection
AT90SCR100 has an On-chip Brown-out Detection (BOD) circuit for monitoring the VCC level
during operation by comparing it to a fixed trigger level. The BOD can be activated or disabled
by the BODENABLE Fuses. The trigger level has a hysteresis to ensure spike free Brown-out
Detection. The hysteresis on the detection level should be interpreted as VBOT+ = VBOT + VHYST/2
and VBOT- = VBOT - VHYST/2.
When the BOD is enabled, and VCC decreases to a value below the trigger level (VBOT- in Figure
9-5), the Brown-out Reset is immediately activated. When VCC increases above the trigger level
(VBOT+ in Figure 9-5), the delay counter starts the MCU after the Time-out period tTOUT has
expired.
The BOD circuit will only detect a drop in VCC if the voltage stays below the trigger level for lon-
ger than tBOD given in Table 9-1.
CC
Table 9-2.
BODENABLE Fuse Coding
BODENABLE Fuse
Min VBOT
Typ VBOT
Max VBOT
1
BOD Disabled
0
2.3 V
Table 9-3.
Brown-out Characteristics
Symbol
Parameter
Min
Typ
Max
Units
VHYST
Brown-out Detector Hysteresis
50
mV
tBOD
Min Pulse Width on Brown-out Reset
ns



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