4.2.3.2
Power ON/OFF Sequences for Single Supply
Figure 4-9. ATSAMA5D27-WLSOM1 Single Supply Connection: Power-On Sequence
SYSTEM STATUS
OFF
STARTUP
POWER-UP
NRST RELEASED
SYSTEM BOOT
I²C COMMAND
VLDO2 POWER UP
VDD_MAIN
5.0V
nSTART_SOM
VDD_3V3
VDDBU
VDDANA
VDDISC
VDDSDHC
VDD_DDR
NRST
PMIC_I2C
VLDO2
t1
t2
t3
t4
a
b
c
d
e
f
Figure 4-10. ATSAMA5D27-WLSOM1 Single Supply Connection: Power-Off Sequence
SYSTEM STATUS
SYSTEM ON
POWER-OFF REQUEST
NRST ASSERTS
SYSTEM OFF
VDD_MAIN
5.0V
SHDN
VDD_3V3
VDDBU
VDDANA
VDDISC
VDDSDHC
VDD_DDR
NRST
PMIC_I2C
VLDO2
t2
t3
t1
a
b
c
d
e
f
Table 4-1. ATSAMA5D27-WLSOM1 Simple Supply Timing Table
Symbol
Description
Min.
Typ.
Max.
Unit
t1
Power-Up Request Timing
0.5
–
2000
ms
t2
VDD_DDR Power-Up Timing
–
8
–
ms
t3
NRST Timing for Release
–
16
–
ms
t4
VLDO2 Power-Up Timing after I²C Request
–
0.5
1
ms
t5
VLDO2 Power-Down Timing after I²C Request
–
–
1
ms
t6
VDD_3V3 Power-Down Timing
–
10
–
µs
t7
NRST Forced to Low Timing
–
–
10
µs
SAMA5D27 Wireless SOM1
Functional Description
©
2021 Microchip Technology Inc.
and its subsidiaries
Complete Datasheet
DS60001590D-page 28
