參數(shù)資料
型號(hào)： A42MX16-2CQ100A
廠商： Electronic Theatre Controls, Inc.
英文描述： 40MX and 42MX FPGA Families
中文描述： 40MX和42MX FPGA系列
文件頁數(shù)： 60/120頁
文件大小： 854K
代理商： A42MX16-2CQ100A
44
4958B–AUTO–11/10
Atmel ATA6285/ATA6286 [Preliminary]
3.9.2.3
Brown-out Detection/Reset
ATA6289 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 BODLS bits in the VMCSR register. 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+ =VBOT + VHYST/2 and VBOT– = VBOT – VHYST/2.
When the BOD is enabled, and VCC decreases to a value below the trigger level (V
BOT- in Fig-
ure 3-19), the Brown-out Reset is immediately activated. When VCC increases above the trigger
level (V
BOT+ in Figure 3-19), the delay counter starts the MCU after the Time- out period tTOUT
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 3-15.
Figure 3-19. Brown-out Reset During Operation
Table 3-14.
Brown-Out Detection Level Select Bit Description
BODLS
Typ. V
BOT
Unit
01.8
V
12.0
V
Table 3-15.
Brown-Out Detection Characteristics
Parameters
Symbol
Typ.
Unit
Brown-out detector hysteresis
V
HYST
50
mV
Min. pulse width on brown-out reset
t
BOD
2s
VBOT-
VBOT+
VCC
RESET
INTERNAL
RESET
TIME-OUT
tTOUT
tBOT
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