AM6546 datasheet(264/284 Pages) TI

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MCU_OSPI[x]_CLK

OSPI/QSPI/SPI

device clock input

OSPI_Board_03

MCU_OSPI[x]_DQS

OSPI device DQS

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

Figure 9-3. OSPI Interface High Level Schematic

9.2.3 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 9-4), 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.

(1)

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

Figure 9-4. USB VBUS Detect Voltage Divider / Clamp Circuit

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

9-4 limits the input current to the actual device pin in a case where VBUS is applied while the device is powered

off.

AM6548, AM6528, AM6546, AM6526

SPRSP52B – DECEMBER 2019 – REVISED JUNE 2021

www.ti.com

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AM6546 데이터시트(PDF) 264 Page - Texas Instruments