Power, Reset And Control; Power Supply Unit (Psu) And Recommended Power-Up Sequence - Dave Embedded Systems AXEL LITE Hardware Manual

AXEL LITE Hardware Manual
5

Power, reset and control

5.1 Power Supply Unit (PSU) and recommended power-up
sequence
Implementing correct power-up sequence for i.MX6 processors is not a
trivial task because several power rails are involved. AXEL LITE SOM
simplifies this task by embedding all the required circuitry. The following
picture shows a simplified block diagram of PSU/voltage monitoring
circuitry:
3.3VIN
2
Axel Lite CPU module
Carrier board
8
PSU
POWER
MANAGEMENT
CIRCUITRY
VIN
i.MX6
1 4
PMIC PF0100 E0
October, 2016
3
CPU_PORn (active-low) is driven
low
PMIC_PWRON signal is pulled-up
5
(unless carrier board circuitry keeps
this signal low for any reason)
6
PMIC transitions from OFF to ON
state
7
PMIC initiates power-up sequence
needed by MX6 processor
9
CPU_PORn is released
* Please refer to reset scheme
ON BOARD
PERIPHERALS
AND MEMORIES
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