at91sam9g20-cu ATMEL Corporation, at91sam9g20-cu Datasheet - Page 772

• Manufacturer Part Number: at91sam9g20-cu
• Description: At91 Arm Thumb Microcontrollers
• Manufacturer: ATMEL Corporation

41.8.3
772
AT91SAM9G20 Preliminary
Power-down Sequence
Tsclk min (22 µs) is obtained for the maximum frequency of the internal RC oscillator (44 kHz).
This gives:
Shown below is an example of the implementation on the AT91SAM9G20-EK Rev.C.
Switch off the VDDIOM and VDDIOP power supplies prior to, or at the same time, as
VDDCORE. No power-up or power-down restrictions apply to VDDBU, VDDPL, VDDANA and
VDDUSB.
• T2 = Tres = 30 µs
• T3 = 3 x Tslck
• T4 = 14 x Tslck
• T2 = Tres = 30 µs
• T3 = 66 µs
• T4 = 308 µs
REGULATED
FORCE
POWER
ON
5V ONLY
J1
J1
J3
J3
SHDN
1
2
C1
C1
330μF
330μF
Q2
Q2
Si1563EDH
Si1563EDH
5V
C14
C14
15PF
15PF
+
+
6
1
CR1
CR1
5V
5V
R3
R3
100K
100K
5
2
R9
R9
10K
10K
10 SQUARE CM COPPER AREA FOR HEAT SINKING
5V
4
3
R166
R166
10K
10K
R165
R165
15K
15K
MN1
MN1
LT1963AEQ-3.3
LT1963AEQ-3.3
C2
C2
10μF
10μF
10V
10V
2
WITH NO SOLDER MASK
VIN
SD
2
3
1
MMSD4148
MMSD4148
R10
R10
10K
10K
-
-
+
+
GND
GND
6
3
MN15A
MN15A
LM293
LM293
D1
D1
VOUT
1
R167
R167
10K
10K
FB
5
5V
4
3V3 CURRENT MEASURE
C15
C15
4.7μF
4.7μF
C3
C3
10μF
10μF
R169
R169
NOT POPULATED
NOT POPULATED
J2
J2
5V
5
1
R161
R161
R162
R162
15K
15K
C1M
MN3
MN3
C4
C4
10μF
10μF
VIN
EN
82K
82K
8
C5
C5
1μF
1μF
TPS60500
TPS60500
C1P
6
GND
5
6
9
C2M
3
+
+
-
-
5V
C6
C6
1μF
1μF
8
4
VOUT
MN15B
MN15B
LM293
LM293
C2P
PG
FB
4
7
7
10
2
C11
C11
22μF
22μF
6384B–ATARM–15-Dec-08
NOT POPULATED
NOT POPULATED
R163
R163
10K
10K
5V
2
R168
R168
IRLML6402
IRLML6402
C147
C147
100NF
100NF
30K
30K
R7
R7
1V0
R164
R164
1K
1K
R11
R11
120K
120K
10PF
10PF
C12
C12
3
Q3
Q3
3V3