AM3359 datasheet(102/256 Pages) TI1

102 / 256 page

VDDS_RTC,

CAP_VDD_RTC

RTC_PWRONRSTn

PMIC_POWER_EN

All other 1.8-V Supplies

VDDSHV 1-6

VDDS_DDR

All 3.3-V Supplies

VDD_CORE, VDD_MPU

PWRONRSTn

CLK_M_OSC

1.8 V

1.1 V

1.8 V

1.8 V/1.5 V/1.35 V

3.3 V

1.1 V

102

AM3359, AM3358, AM3357, AM3356, AM3354, AM3352, AM3351

SPRS717L – OCTOBER 2011 – REVISED MARCH 2020

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Product Folder Links: AM3359 AM3358 AM3357 AM3356 AM3354 AM3352 AM3351

Power and Clocking

RTC_PWRONRSTn should be asserted for at least 1 ms to provide enough time for the internal RTC LDO output to

reach a valid level before RTC reset is released.

The CAP_VDD_RTC terminal operates as an input to the RTC core voltage domain when the internal RTC LDO is

disabled by connecting the RTC_KALDO_ENn terminal to VDDS_RTC. If the internal RTC LDO is disabled,

CAP_VDD_RTC should be sourced from an external 1.1-V power supply.

When using the ZCZ package option, VDD_MPU and VDD_CORE power inputs may be powered from the same

source if the application only uses operating performance points (OPPs) that define a common power supply voltage

for VDD_MPU and VDD_CORE. The ZCE package option has the VDD_MPU domain merged with the VDD_CORE

domain.

If a USB port is not used, the respective VDDA1P8V_USB terminal may be connected to any 1.8-V power supply and

the respective VDDA3P3V_USB terminal may be connected to any 3.3-V power supply. If the system does not have a

3.3-V power supply, the VDDA3P3V_USB terminal may be connected to ground.

If the system uses mDDR or DDR2 memory devices, VDDS_DDR can be ramped simultaneously with the other 1.8-V

I/O power supplies.

VDDS_RTC should be ramped at the same time or before CAP_VDD_RTC, but these power inputs can be ramped

independent of other power supplies if PMIC_POWER_EN functionality is not required. If CAP_VDD_RTC is ramped

after VDD_CORE, there might be a small amount of additional leakage current on VDD_CORE. The power sequence

shown provides the lowest leakage option.

To configure VDDSHVx [1-6] as 1.8 V, power up the respective VDDSHVx [1-6] to 1.8 V following the recommended

sequence. To configure VDDSHVx [1-6] as 3.3 V, power up the respective VDDSHVx [1-6] to 3.3 V following the

recommended sequence.

If all the 1.8-V supplies are not sourced from the same power supply, it is required to power up VDDS before other

1.8-V supplies. Further, it is also recommended to source VDDS and VDDSHvx [x = 1-6] when configured as 1.8V

from the same power supply.

Figure 6-5. Power-Supply Sequencing With Internal RTC LDO Disabled

AM3359 Datasheet(PDF) 102 Page - Texas Instruments

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