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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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TPS65982ABZBHR датащи(PDF) 35 Page - Texas Instruments |
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TPS65982ABZBHR датащи(HTML) 35 Page - Texas Instruments |
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35 / 121 page  R DRIVER DRIVER DRIVER ZDRIVER 1 s R C = + ´ ´ DC Bias DC Bias VOH VOL DC Bias DC Bias VOH VOL USB-PD Modem Digitally Adjustable VREF Level Shifter Level Shifter Driver Digitally Adjustable VREF C_CC2 C_CC1 LDO_BMC PD_TX PD_RX 35 TPS65982 www.ti.com SLVSD02D – MARCH 2015 – REVISED JUNE 2019 Product Folder Links: TPS65982 Submit Documentation Feedback Copyright © 2015–2019, Texas Instruments Incorporated Feature Description (continued) Figure 14. USB-PD BMC TX/Rx Block Diagram Figure 15 shows the transmission of the BMC data on top of the DC bias. Note, The DC bias can be anywhere between the minimum threshold for detecting a UFP attach (VD_CCH_USB) and the maximum threshold for detecting a UFP attach to a DFP (VD_CCH_3P0) defined in the Cable Plug and Orientation Detection section. This means that the DC bias can be below VOH of the transmitter driver or above VOH. Figure 15. TX Driver Transmission with DC Bias The transmitter drives a digital signal onto the C_CCn lines. The signal peak VTXP is adjustable by application code and sets the VOH/VOL for the BMC data that is transmitted, and is defined in USB-PD TX Driver Voltage Adjustment Parameter. Keep in mind that the settings in a final system must meet the TX masks defined in the USB-PD Specifications. When driving the line, the transmitter driver has an output impedance of ZDRIVER. ZDRIVER is determined by the driver resistance and the shunt capacitance of the source and is frequency dependent. ZDRIVER impacts the noise ingression in the cable. Figure 16 shows the simplified circuit determining ZDRIVER. It is specified such that noise at the receiver is bounded. ZDRVER is defined by Equation 1. (1) |
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