AM652X datasheet(260/277 Pages) TI1

260 / 277 page

260

AM6548, AM6528, AM6546

AM6526, AM6527

SPRSP08I – NOVEMBER 2017 – REVISED DECEMBER 2019

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Applications, Implementation, and Layout

needs its own high-frequency decoupling capacitor, not shown in Figure 7-6.

(2) In this Figure, the VDD_WKUP0 and VDD_WKUP1 supplies are sourced through the WKUP LDO, not an external supply.

(3) Refer to Figure 7-10 through for details about external capacitor connections when using the SDIO LDO.

7.2.8.1

LVCMOS External Capacitor Connections

Each VDDSHV8, VDDSHV[5:0], and VDDSHV[2:0]_WKUP can be configured as 1.8 V or 3.3 V. Figure 7-

7 through Figure 7-10 illustrate different system configurations for the dual-voltage I/O supplies.

VDDSHV8, VDDSHV[5:0], and VDDSHV[2:0]_WKUP are the dual-voltage LVCMOS I/O supplies, while

VDDS8 and VDDS[5:0] are the dual-voltage LVCMOS I/O bias supplies. If any of the VDDSHV8 and

VDDSHV[5:0]] or VDDSHV[2:0]_WKUP are configured for 3.3 V operation, the corresponding VDDS8 and

VDDS[5:0] or VDDS[2:0]_WKUP should be sourced from the internal I/O Bias LDO. When any of the

VDDSHV[8:0] or VDDSHV[2:0]_WKUP are configured for 1.8 V operation, both VDDS[8:0] and

VDDSHV[8:0] or VDDS[2:0]_WKUP and VDDSHV[2:0]_WKUP should be supplied from the same source.

Two I/O Bias LDOs are integrated on this device to share load current. The recommended load sharing is

as follows:

•

IOLDO0 : VDDS0, VDDS1, VDDS2, VDDS5, VDDS7, VDDS8

•

IOLDO1 : VDDS3, VDDS4, VDDS6

Figure 7-7 shows all VDDSHV8, VDDSHV[5:0], and VDDSHV[2:0]_WKUP supplies configured for 3.3V

operation.

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