Table 7-4 and Figure 7-5 describes the device power-up sequencing.
Note: The power supply sequencing
requirements defined in this section does not include entry or exit from low power
modes. See
Section 7.11.2.2.3,
Partial IO Power Sequencing for more information on power supply sequence
requirements when entering or exiting low power modes.
Table 7-4 Power-Up Sequencing – Supply / Signal Assignments See: Figure 7-5
WAVEFORM |
SUPPLY / SIGNAL NAME |
A |
VSYS(1), VMON_VSYS(2) |
B |
VDDSHV_CANUART(3), VDDSHV_MCU(3), VDDSHV0(3), VDDSHV1(3), VDDSHV2(3), VDDSHV3(3), VDDA_3P3_USB, VMON_3P3_SOC(4) |
C |
VDDSHV_CANUART(5), VDDSHV_MCU(5), VDDSHV0(5), VDDSHV1(5), VDDSHV2(5), VDDSHV3(5), VDDA_MCU, VDDS_OSC0, VDDA_PLL0, VDDA_PLL1, VDDA_PLL2,
VDDA_1P8_CSIRX0, VDDA_1P8_USB, VDDA_TEMP0, VDDA_TEMP1,
VMON_1P8_SOC(6) |
D |
VDDSHV4(7), VDDSHV5(7), VDDSHV6(7) |
E |
VDDS_DDR(8), VDDS_DDR_C(8) |
F |
VDD_CANUART(9) |
G |
VDD_CANUART(10), VDD_CORE(10)(12), VDDA_CORE_CSIRX0(10), VDDA_CORE_USB0(10), VDDA_DDR_PLL0(10) |
H |
VDD_CANUART(11), VDD_CORE(11)(12), VDDA_CORE_CSIRX0(11), VDDA_CORE_USB0(11), VDDA_DDR_PLL0(11), VDDR_CORE(12) |
I |
VPP(13) |
J |
MCU_PORz |
K |
MCU_OSC0_XI, MCU_OSC0_XI |
(1) VSYS represents the name of a
supply which sources power to the entire system. This supply is expected to be a
pre-regulated supply that sources power management devices which source all
other supplies.
(2) VMON_VSYS input is used to
monitor VSYS via an external resistor divider circuit. For more information, see
the System Power Supply Monitor Design Guidelines.
(3) VDDSHV_CANUART, VDDSHV_MCU, and
VDDSHVx [x=0-3] are dual voltage IO supplies which can be operated at 1.8V or
3.3V depending on the application requirements.VDDSHV_CANUART shall be connected to an always-on power source when using
Partial IO low power mode, or connected to any valid IO power source when not
using Partial IO low power mode. When VDDSHV_CANUART is not connected to an
always-on power source and is operating at 3.3V, it shall be ramped up with
other 3.3V supplies during the 3.3V ramp period defined by this waveform.When any of the VDDSHV_MCU and VDDSHVx [x=0-3]
IO supplies are operating at 3.3V, they shall be ramped up with other 3.3V
supplies during the 3.3V ramp period defined by this waveform.
(4) The VMON_3P3_SOC input is used to
monitor supply voltage and shall be connected to the respective 3.3V supply
source.
(5) VDDSHV_CANUART, VDDSHV_MCU, and
VDDSHVx [x=0-3] are dual voltage IO supplies which can be operated at 1.8V or
3.3V depending on the application requirements.VDDSHV_CANUART shall be connected to an always-on power source when using
Partial IO low power mode, or connected to any valid IO power source when not
using Partial IO low power mode. When VDDSHV_CANUART is not connected to an
always-on power source and is operating at 1.8V, it shall be ramped up with
other 1.8V supplies during the 1.8V ramp period defined by this waveform.When any of the VDDSHV_MCU and VDDSHVx [x=0-3]
IO supplies are operating at 1.8V, they shall be ramped up with other 1.8V
supplies during the 1.8V ramp period defined by this waveform.
(6) The VMON_1P8_SOC input is used to
monitor supply voltage and shall be connected to the respective 1.8V supply
source.
(7) VDDSHV4, VDDSHV5, and VDDSHV6
were designed to support power-up, power-down, or dynamic voltage change without
any dependency on other power rails. This capability is required to support
UHS-I SD Cards.
(8) VDDS_DDR and VDDS_DDR_C are
expected to be powered by the same source such that they ramp together.
(9) VDD_CANUART shall be connected to
an always-on power source when using Partial IO low power mode.When VDD_CANUART is connected to an always-on
power source, the potential applied to VDD_CORE must never be greater than the
potential applied to VDD_CANUART + 0.18V during power-up or power-down. This
requires VDD_CANUART to ramp up before and ramp down after VDD_CORE. VDD_CANUART
does not have any ramp requirements beyond the one defined for VDD_CORE.
(10) VDD_CANUART shall be connected to
the same power source as VDD_CORE, VDDA_CORE_CSIRX0, VDDA_CORE_USB, and
VDDA_DDR_PLL0 when not using Partial IO low power mode.VDD_CANUART, VDD_CORE, VDDA_CORE_CSIRX0,
VDDA_CORE_USB, and VDDA_DDR_PLL0 can be operated at 0.75V or 0.85V. When these
supplies are operating at 0.75V, they shall be ramped up prior to VDDR_CORE as
defined by this waveform.
(11) VDD_CANUART shall be connected to
the same power source as VDD_CORE, VDD_CORE, VDDA_CORE_CSIRX0, VDDA_CORE_USB,
and VDDA_DDR_PLL0 when not using Partial IO low power mode.VDD_CANUART, VDD_CORE, VDDA_CORE_CSIRX0,
VDDA_CORE_USB, and VDDA_DDR_PLL0 can be operated at 0.75V or 0.85V. When these
supplies are operating at 0.85V, they shall be powered from the same source as
VDDR_CORE and ramped during the 0.85V ramp period defined by this waveform.
(12) The potential applied to
VDDR_CORE must never be greater than the potential applied to VDD_CORE + 0.18V
during power-up or power-down. This requires VDD_CORE to ramp up before and ramp
down after VDDR_CORE when VDD_CORE is operating at 0.75V. VDD_CORE does not have
any ramp requirements beyond the one defined for VDDR_CORE.VDD_CORE and VDDR_CORE are expected to be
powered by the same source so they ramp together when VDD_CORE is operating at
0.85V.
(13) VPP is the 1.8V eFuse programming supply, which shall be left floating (HiZ) or
grounded during power-up/down sequences and during normal device operation. This
supply shall only be sourced while programming eFuse.