AM625 datasheet(101/235 Pages) TI

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7.10.2.2.1 Power-Up Sequencing

Figure 7-5 describes the device power-up sequencing.

AM64x_ELCH_01

VDDSHV_MCU , VDDSHV0 , VDDSHV1 , VDDSHV2 , VDDSHV3 ,

(3)

VDDSHV4 , VDDSHV5 , VDDSHV6 , VDDSHV_CANUART , VDDA_3P3_USB,

(3)

VMON_3P3_SOC

(4)

VSYS, VMON_VSYS

VDDS_OSC0, VDDSHV_MCU , VDDSHV0 , VDDSHV1 , VDDSHV2 , VDDSHV3 ,

(5)

VDDSHV4 , VDDSHV5 ,

, VDDA_MCU,

VDDSHV6

VDDSHV_CANUART

(5)

VDDA_PLL0, VDDA_PLL1, VDDA_PLL2, VDDA_1P8_CSIRX0, VDDA_1P8_OLDI0,

VDDA_1P8_USB, VMON_1P8_SOC , VDDA_TEMP0, VDDA_TEMP1

(6)

VDDS_DDR , VDDS_DDR_C

(7)

VDD_CORE

, VDD_CANUART , VDDA_CORE_CSIRX0 , VDDA_CORE_USB ,

(8)(10)

(8)

(12)

VDDA_DDR_PLL0

VDD_CORE

, VDDR_CORE

, VDDA_CANUART ,VDDA_CORE_CSIRX0 ,

(9)(10)

(10)

(9)

VDDA_CORE_USB0 ,VDDA_DDR_PLL0

(9)

(12)

VPP

(11)

MCU_PORz

MCU_OSC0_XI, MCU_OSC0_XO

Hi-Z

VSYS

VMON_VSYS

Note 1

Note 2

Figure 7-5. Power-Up Sequencing

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=0-6] 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 conencted 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=0-6] 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=0-6] 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 conencted 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=0-6] 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.

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SPRSP58 – JUNE 2022

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