Table 6-7, Figure 6-5, and Figure 6-6 define device power sequencing requirements when there is no plans to use RTC
Only low-power mode or RTC + IO + DDR low-power mode.
Table 6-5 No Low-Power Mode Sequencing –
Supply / Signal Assignments See: Figure 6-5 and Figure 6-6
| WAVEFORM |
SUPPLY / SIGNAL NAME |
| A |
System power |
| B |
VDDSHV0(1), VDDSHV1(1), VDDA_3P3_USB |
| C |
VDDSHV0(2), VDDSHV1,(2), VDDS_OSC0, VDDS_RTC, VDDA_PLL0, VDDA_PLL1, VDDS_WKUP, VDDS0,
VDDS1, VDDA_ADC,
VDDA_1P8_DSI, VDDA_1P8_USB |
| D |
VDDA_3P3_SDIO(3)(4), VDDSHV2(3), VDDSHV3(3), VDDSHV4(3) |
| E |
VDDS_DDR(5) |
| F |
VDD_CORE, VDDA_CORE_DSI(6), VDDA_CORE_DSI_CLK(6), VDDA_CORE_USB(6), VDDA_DDR_PLL0(6), VDD_RTC |
| G |
WKUP_OSC0_XI, WKUP_OSC0_XO |
| H |
PORz |
(1) VDDSHV0 and VDDSHV1 are dual voltage IO supplies which can be
operated at 1.8V or 3.3V depending on the application requirements. When any of
the VDDSHVx [x=0-1] 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.
(2) VDDSHV0 and VDDSHV1 are dual voltage IO supplies which can be
operated at 1.8V or 3.3V depending on the application requirements. When any of
the VDDSHVx [x=0-1] 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.
(3) VDDA_3P3_SDIO was designed to support power-up or power-down
without any dependency on other power rails. VDDSHV2, VDDSHV3, and VDDSHV4 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.
(4) VDDA_3P3_SDIO is the 3.3V power
rail for the internal SDIO_LDO. This power rail must be sourced from the same
3.3V power supply that provides power to a UHS-I SD Card connected to MMC1,
which allows the MMC1 IOs and the SD Card IOs to power-up and power-down at the
same time when the SD Card power supply is powered off to reset the SD Card. For
this use case the SDIO_LDO output (CAP_VDDSHV_MMC) is used to power the VDDSHV3
IO power rail, which will ramp-up and ramp-down along with the VDDA_3P3_SDIO
power rail.
(5) VDDS_DDR does not have any specific power sequence requirement, but the JEDEC
standard for DDR devices requires the potential applied to its VDD1
power rail to always be greater than the potential applied to its
VDD2 power rail during the power-up and power-down
sequences.
(6) VDDA_CORE_DSI, VDDA_CORE_DSI_CLK, VDDA_CORE_USB, VDDA_DDR_PLL0,
and VDD_RTC shall be sourced from the same power source as VDD_CORE. Care should
be taken to ensure that voltage differential between VDD_CORE and VDDA_CORE_USB
is within +/- 1%.