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TPS65982ABZBHR bảng dữ liệu(PDF) 35 Page - Texas Instruments

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tên linh kiện TPS65982ABZBHR
Giải thích chi tiết về linh kiện  USB Type-C and USB PD Controller, Power Switch, and High-Speed Multiplexer
PDF  121 Pages
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nhà sản xuất  TI1 [Texas Instruments]
Trang chủ  http://www.ti.com
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TPS65982ABZBHR bảng dữ liệu(HTML) 35 Page - Texas Instruments

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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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