Datasheet

Electrical Characteristics
i.MX 6DualPlus/6QuadPlus Automotive Applications Processors, Rev. 3, 11/2018
NXP Semiconductors 33
4.2 Power Supplies Requirements and Restrictions
The system design must comply with power-up sequence, power-down sequence, and steady state
guidelines as described in this section to ensure the reliable operation of the device. Any deviation from
these sequences may result in the following situations:
• Excessive current during power-up phase
• Prevention of the device from booting
• Irreversible damage to the processor
4.2.1 Power-Up Sequence
For power-up sequence, the restrictions are as follows:
• VDD_SNVS_IN supply must be turned ON before any other power supply. It may be connected
(shorted) with VDD_HIGH_IN supply.
• If a coin cell is used to power VDD_SNVS_IN, then ensure that it is connected before any other
supply is switched on.
• The SRC_POR_B signal controls the processor POR and must be immediately asserted at
power-up and remain asserted until the VDD_ARM_CAP, VDD_SOC_CAP, and VDD_PU_CAP
supplies are stable. VDD_ARM_IN and VDD_SOC_IN may be applied in either order with no
restrictions.
NOTE
Ensure that there is no back voltage (leakage) from any supply on the board
towards the 3.3 V supply (for example, from the external components that
use both the 1.8 V and 3.3 V supplies).
NOTE
USB_OTG_VBUS and USB_H1_VBUS are not part of the power supply
sequence and can be powered at any time.
4.2.2 Power-Down Sequence
There are no special restrictions for i.MX 6DualPlus/6QuadPlus SoC.
4.2.3 Power Supplies Usage
• All I/O pins must not be externally driven while the I/O power supply for the pin (NVCC_xxx) is
OFF. This can cause internal latch-up and malfunctions due to reverse current flows. For
information about I/O power supply of each pin, see the “Power Group” column of Table 96, “21
x 21 mm Functional Contact Assignments”.
• When the SATA interface is not used, the SATA_VP and SATA_VPH supplies should be grounded.
The input and output supplies for rest of the ports (SATA_REXT, SATA_PHY_RX_N,
SATA_PHY_RX_P, and SATA_PHY_TX_N) can remain unconnected. It is recommended not to
turn OFF the SATA_VPH supply while the SATA_VP supply is ON, as it may lead to excessive