Datasheet

Electrical characteristics
i.MX RT1015 Crossover Processors Data Sheet for Consumer Products, Rev. 0.1, 03/2019
NXP Semiconductors 21
4.2.1.2 Power-down sequence
The following restrictions must be followed:
• VDD_SNVS_IN supply must be turned off after any other power supply or be connected (shorted)
with VDD_HIGH_IN supply.
• If a coin cell is used to power VDD_SNVS_IN, then ensure that it is removed after any other supply
is switched off.
4.2.1.3 Power supplies usage
All I/O pins should 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 “Power Rail” columns in pin list tables of Section 6, Package information
and contact assignments.”
4.2.2 Integrated LDO voltage regulator parameters
Various internal supplies can be powered ON from internal LDO voltage regulators. All the supply pins
named *_CAP must be connected to external capacitors. The on-board LDOs are intended for internal use
only and should not be used to power any external circuitry. See the i.MX RT1015 Reference Manual
(IMXRT1015RM) for details on the power tree scheme.
NOTE
The *_CAP signals should not be powered externally. These signals are
intended for internal LDO operation only.
4.2.2.1 Digital regulators (LDO_SNVS)
There are one digital LDO regulator (“Digital”, because of the logic loads that they drive, not because of
their construction). The advantages of the regulator is to reduce the input supply variation because of its
input supply ripple rejection and its on-die trimming. This translates into more stable voltage for the
on-chip logics.
The regulator has two basic modes:
• Power Gate. The regulation FET is switched fully off limiting the current draw from the supply.
The analog part of the regulator is powered down here limiting the power consumption.
• Analog regulation mode. The regulation FET is controlled such that the output voltage of the
regulator equals the programmed target voltage. The target voltage is fully programmable in 25 mV
steps.
For additional information, see the i.MX RT1015 Reference Manual (IMXRT1015RM).