iMX RT1052 OEM Developer’s Kit - User’s Guide
Page 17
Copyright 2018 © Embedded Artists AB
There are two voltage regulators:
3.3V/2A that is the main supply voltage for both the
iMX RT1052 OEM board
and the
iMX
OEM Carrier board
.
This is a buck dcdc regulator to minimize power dissipation. The regulator can be switched
on/off by control signal EXT_PWR_EN.
3.3V/25mA that is the secondary supply voltage that is "always on". It powers the
VDD_SNVS_IN supply input on the i.MX RT1052. Current consumption is typically very low
on this supply. This is a linear regulator.
Note that due to the erratas on i.MX RT1052 rev A0 silicon, the secondary supply voltage is
2.9V instead of 3.3V and it has much higher current rating (350 mA) than normally needed.
The
iMX OEM Carrier board
supports both 2.9 and 3.3V on VIN_ALWAYSON. When R25
(2.2Mohm) is mounted the voltage is 2.9V and when R25 is removed the voltage is 3.3V.
The picture below illustrates the location of relevant jumpers and LEDs.
Figure 12 – Location of Power Supply Connectors and Jumpers
Powering Selector
J29
Left (1-2): Power via +5V DC (J1)
Right (2-3): Power via USB (J22), default
Power Supply Input
J1
2.1mm ID, 5.5mm OD jack.
Center positive
Input Power Enable
J21 default inserted
DCDC enable ctrl
JP1 default inserted
Peripheral Voltage Control
J5
Upper (1-2): Peripheral voltage controlled by PERI_PWREN
(default when Q7 has been removed - boards shipped
after April 2018)
Lower (2-3): Peripheral voltage always on
(default on boards shipped before April 2018)
Peripheral 3.3V
supply
LED3
Peripheral 3.3V supply
LED1 - Over-voltage
LED2 - Input voltage ok
Secondary (3.3V) Voltage Control
J28
Right (1-2): 3.3V always-on voltage (default)
Left (2-3): 3.3V main voltage