AM652X datasheet(143/277 Pages) TI1

143 / 277 page

143

AM6548, AM6528, AM6546

AM6526, AM6527

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SPRSP08I – NOVEMBER 2017 – REVISED DECEMBER 2019

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Product Folder Links: AM6548 AM6528 AM6546 AM6526 AM6527

Specifications

Characteristics – Crystal Mode. For more information about WKUP_LFOSC0 clock source configuration, refer to device TRM.

(4) PORz should be pulled to VDDSHV0. MCU_PORz should be pulled to VDDSHV0_WKUP.

(5) MCU_BYP_POR should be pulled to VDDSHV0_WKUP.

(6) If any of the VDDSHV[0-8] rails are used as 3.3 V only, then these rails must be ramped-up with the 3.3 V power supplies.

(7) If MCU_BYP_POR is configured at 3.3 V only, then this signal must be ramped-up at the same time with the 3.3 V power supplies.

(8) If any of the RESETz, MCU_RESETz signals are configured at 3.3 V only, then these signals must be ramped-up at the same time with

the 3.3 V power supplies.

(9) OSC1 crystal clock sources is enabled by default. For the oscillator start-up time, see Table 5-25, OSC1 Switching Characteristics –

Crystal Mode. For more information about OSC1 clock source configuration, refer to device TRM.

(10) Blue dashed lines are not valid windows but show alternate ramp possibilities based on the associated note.

(11) If WKUP LDO is used to power the WKUP domain, connect CAP_VDD_WKUP pin to VDD_WKUP0/1 pin. VDD_WKUP0/1 will start

ramping after VDDA_LDO_WKUP reaches a certain threshold. If WKUP LDO is bypassed, connect VDD_WKUP0/1 with VDD_MCU.

(12) PORz_OUT and MCU_PORz_OUT should be pulled down.

(13) Refer to the Clock Specifications section for the oscillator start-up time.

5.9.2.3

Power-Down Sequencing

A typical power down sequence is to have the Power-on-Reset asserted, clock shut down, and ramp down

all the power supplies sequentially in the exact reverse order of the power-up sequencing. In other words,

the power supply that has been ramped up first should be the last one that is ramped down.

For AM654x/AM652x, there are no specific power-down sequencing requirements, except for asserting

Power-on-Reset before ramping down the rails while bypassing internal POR.

AM652X Datasheet(PDF) 143 Page - Texas Instruments