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TPS254900A-Q1 Datasheet(PDF) 25 Page - Texas Instruments |
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TPS254900A-Q1 Datasheet(HTML) 25 Page - Texas Instruments |
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25 / 39 page  25 TPS254900A-Q1 www.ti.com SLUSCU5A – NOVEMBER 2017 – REVISED JANUARY 2018 Product Folder Links: TPS254900A-Q1 Submit Documentation Feedback Copyright © 2017–2018, Texas Instruments Incorporated Passing the IEC 61000-4-2 test for DP_IN and DM_IN requires connecting a discharge resistor to OUT during USB 2.0 high-speed enumeration. In client mode, because the power switch is OFF, OUT must be 5 V so that the device can work normally (usually powered by an external downstream USB port). If the OUT voltage is low, the communication may not work properly. 8.4.6 High-Bandwidth Data-Line Switch The D+ and D– data lines pass through the device to enable monitoring and handshaking while supporting the charging operation. A wide-bandwidth signal switch allows data to pass through the device without corrupting signal integrity. The data-line switches are turned on in any of the CDP, SDP or client operating modes. The EN input must be at logic high for the data-line switches to be enabled. NOTE • While in CDP mode, the data switches are ON, even during CDP handshaking. • The data switches are only for the USB-2.0 differential pair. In the case of a USB-3.0 host, the super-speed differential pairs must be routed directly to the USB connector without passing through the TPS254900A-Q1 device. • Data switches are OFF during OUT (VBUS) discharge. |
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