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AM6548BACDXEAF Datasheet(PDF) 263 Page - Texas Instruments |
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AM6548BACDXEAF Datasheet(HTML) 263 Page - Texas Instruments |
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263 / 282 page  – A to B = C to D – Matching skew: < 60pS A B MCU_OSPI[x]_CLK R1 OSPI/QSPI/SPI device clock input 0 * Ω OSPI_Board_03 C D 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 VSS 76.8 k 1% Ω ± 23.2 k 1% Ω ± 16 k 1% 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. www.ti.com AM6548, AM6528, AM6526 SPRSP52B – DECEMBER 2019 – REVISED JUNE 2021 Copyright © 2021 Texas Instruments Incorporated Submit Document Feedback 263 Product Folder Links: AM6548 AM6528 AM6526 |
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