AM652X datasheet(285/299 Pages) TI1

285 / 299 page

Device

USBn_VBUS

SPRSP08_USB_VBUS_01

VSS

76.8 k

Ω

23.2 k

Ω

16 k

Ω

VBUS signal

285

AM6548, AM6528, AM6546

AM6526, AM6527

www.ti.com

SPRSP08E – NOVEMBER 2017 – REVISED OCTOBER 2018

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Product Folder Links: AM6548 AM6528 AM6546 AM6526 AM6527

Applications, Implementation, and Layout

Figure 7-4. USB VBUS Detect Voltage Divider / Clamp Circuit(1)

(1) USBn_VBUS, where n = 0 or 1.

The USB0_VBUS and USB1_VBUS pins may be considered to be fail-safe because the external circuit in

Figure 7-4 limits the input current to the actual device pin in a case where VBUS is applied while the

device is powered off.

7.5

Power Distribution Network Implementation Guidance

The Sitara Processor Power Distribution Networks: Implementation and Analysis (SPRAC76) available

from http://www.ti.com/lit/pdf/sprac76 provides guidance for successful implementation of the power

distribution network. This includes PCB stackup guidance as well as guidance for optimizing the selection

and placement of the decoupling capacitors. TI supports only designs that follow the board design

guidelines contained in the application report.

7.6

External Capacitors

Figure 7-5 shows an example of the external decoupling capacitor connections.

AM652X 数据表(PDF) 285 Page - Texas Instruments