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ATmega325P 데이터시트(PDF) 308 Page - ATMEL Corporation

부품명 ATmega325P
상세설명  8-bit Microcontroller with 32K Bytes In-System Programmable Flash
PDF  364 Pages
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제조업체  ATMEL [ATMEL Corporation]
홈페이지  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATmega325P 데이터시트(HTML) 308 Page - ATMEL Corporation

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308
8023F–AVR–07/09
ATmega325P/3250P
26.5
System and Reset Characterizations
26.6
Standard Power-on Reset
This implementation of power-on reset existed in early versions of ATmega325P/3250P. The
table below describes the characteristics of this power-on reset and it is valid for the following
devices, only:
• ATmega325P revision B and older
• ATmega3250P revision B and older
Note:
1. The Power-on Reset will not work unless the supply voltage has been below VPOT (falling)
26.7
Enhanced Power-on Reset
This implementation of power-on reset exists in newer versions of ATmega325P/3250P. The
table below describes the characteristics of this power-on reset and it is valid for the following
devices only:
• ATmega325P revision C and newer
• ATmega3250P revision C and newer
Table 26-3.
Reset, Brown-out, and Internal Voltage Reference Characteristics
Symbol
Parameter
Condition
Min
Typ
Max
Units
VRST
RESET Pin Threshold Voltage
VCC = 3V
0.2 VCC
0.85 VCC
V
tRST
Minimum pulse width on RESET Pin
V
CC = 3V
800
ns
VHYST
Brown-out Detector Hysteresis
50
mV
tBOD
Min Pulse Width on Brown-out Reset
2
µs
VBG
Bandgap reference voltage
V
CC = 2.7V,
TA = 25°C
1.0
1.1
1.2
V
tBG
Bandgap reference start-up time
VCC = 2.7V,
T
A = 25°C
40
70
µs
IBG
Bandgap reference current consumption
VCC = 2.7V,
TA = 25°C
15
µA
Table 26-4.
Reset, Brown-out, and Internal Voltage Reference Characteristics,
TA = -40°C to 85°C
Symbol
Parameter
Min
Typ
Max
Units
VPOT
Power-on Reset Threshold Voltage (rising)
0.7
1.0
1.4
V
Power-on Reset Threshold Voltage (falling)(1)
0.05
0.9
1.3
V
SRON
Power-on Slope Rate
0.01
4.5
V/ms



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