AM652X datasheet(256/277 Pages) TI1

256 / 277 page

Device

USBn_VBUS

SPRSP08_USB_VBUS_01

VSS

76.8 k

Ω

23.2 k

Ω

16 k

Ω

VBUS signal

(BZX84C6V8 or equivalent)

6.8V

MCU_OSPI[x]_CLK

OSPI/QSPI/SPI

device clock input

OSPI_Board_03

MCU_OSPI[x]_DQS

OSPI device DQS

256

AM6548, AM6528, AM6546

AM6526, AM6527

SPRSP08I – NOVEMBER 2017 – REVISED DECEMBER 2019

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Product Folder Links: AM6548 AM6528 AM6546 AM6526 AM6527

Applications, Implementation, and Layout

•

Propagation delays and matching:

–

A to B = C to D

–

Matching skew: < 60pS

*0 Ω resistor (R1), located as close as possible to the MCU_OSPI[x]_CLK pin, is placeholder for fine tuning, if needed

Figure 7-3. OSPI Interface High Level Schematic

7.2.3

USB Design Guidelines

The USB 3.1 specification allows the VBUS voltage to be as high as 5.5 V for normal operation, and as

high as 20 V when the Power Delivery addendum is supported. Some automotive applications require a

max voltage to be 30 V.

The AM65xx device requires the VBUS signal voltage be scaled down using an external resistor divider

(as shown in the Figure 7-4), which limits the voltage applied to the actual device pin (USB0_VBUS,

USB1_VBUS). The tolerance of these external resistors should be equal to or less than 1%, and the

leakage current of zener diode at 5 V should be less than 100 nA.

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

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

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