參數(shù)資料
型號: AT90USB647-AUR
廠商: Atmel
文件頁數(shù): 64/106頁
文件大小: 0K
描述: MCU AVR 64K FLASH 16MHZ 64TQFP
產(chǎn)品培訓(xùn)模塊: MCU Product Line Introduction
megaAVR Introduction
標(biāo)準(zhǔn)包裝: 1
系列: AVR® 90USB
核心處理器: AVR
芯體尺寸: 8-位
速度: 16MHz
連通性: EBI/EMI,I²C,SPI,UART/USART,USB,USB OTG
外圍設(shè)備: 欠壓檢測/復(fù)位,POR,PWM,WDT
輸入/輸出數(shù): 48
程序存儲(chǔ)器容量: 64KB(64K x 8)
程序存儲(chǔ)器類型: 閃存
EEPROM 大?。?/td> 2K x 8
RAM 容量: 4K x 8
電壓 - 電源 (Vcc/Vdd): 2.7 V ~ 5.5 V
數(shù)據(jù)轉(zhuǎn)換器: A/D 8x10b
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 85°C
封裝/外殼: 64-TQFP
包裝: 剪切帶 (CT)
配用: ATSTK600-RC17-ND - STK600 ROUTING CARD AVR
其它名稱: AT90USB647-AURCT
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
A
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