Atmel Evaluation Kit AT91SAM9X25-EK AT91SAM9X25-EK 데이터 시트
제품 코드
AT91SAM9X25-EK
1103
SAM9X25 [DATASHEET]
11054E–ATARM–10-Mar-2014
46.14 POR Characteristics
A general presentation of Power-On-Reset (POR) characteristics is provided in
Figure 46-5. General Presentation of POR Behavior
When a very slow (versus
t
RES
) supply rising slope is applied on POR VDD pin, the reset time becomes negligible and the
reset signal is released when V
DD
rises higher than
V
th+
.
When a very fast (versus
t
RES
) supply rising slope is applied on POR VDD pin, the voltage threshold becomes negligible
and the reset signal is released after
t
RES
time. It is the smallest possible reset time.
46.14.1 Core Power Supply POR Characteristics
46.14.2 Backup Power Supply POR Characteristics
Dynamic
t
res
NRST
VDD
V
th+
V
th-
Vop
Static
Vnop
Table 46-28. Core Power Supply POR Characteristics
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
V
th+
Threshold Voltage Rising
Minimum Slope of +2.0V/30ms
0.5
0.7
0.89
V
V
th-
Threshold Voltage Falling
Minimum Slope of +2.0V/30ms
0.4
0.6
0.85
V
t
RES
Reset Time
30
70
130
µ
s
I
DD
Current consumption
After t
RES
3
7
µ
A
Table 46-29. Backup Power Supply POR Characteristics
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
V
th+
Threshold Voltage Rising
Minimum Slope of +2.0V/30ms
1.42
4.52
1.62
V
V
th-
Threshold Voltage Falling
Minimum Slope of +2.0V/30ms
1.35
1.45
1.55
V
t
RES
Reset Time
V
DDBU
is 3.3V
30
80
220
µ
s
V
DDBU
is 1.8V
40
100
330
I
DD
Current consumption
After t
RES
6
8.5
µ
A