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TPS25751D Scheda tecnica(PDF) 29 Page - Texas Instruments

Il numero della parte TPS25751D
Spiegazioni elettronici  TPS25751 USB Type-C® and USB PD Controller with Integrated Power Switches Optimized for Power Applications
PDF  89 Pages
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Produttore elettronici  TI1 [Texas Instruments]
Homepage  http://www.ti.com
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TPS25751D Scheda tecnica(HTML) 29 Page - Texas Instruments

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Figure 8-9 shows the simplified circuit determining ZDRIVER. It is specified such that noise at the receiver is
bounded.
Driver
R
DRIVER
C
DRIVER
Z
DRIVER
Figure 8-9. ZDRIVER Circuit
8.3.1.5 USB-PD BMC Receiver
The receiver block of the TPS25751 receives a signal that follows the allowed Rx masks defined in the USB PD
specification. The receive thresholds and hysteresis come from this mask.
Figure 8-10 shows an example of a multi-drop USB-PD connection (only the CC wire). This connection has
the typical Sink (device) to Source (host) connection, but also includes cable USB-PD Tx/Rx blocks. Only one
system can be transmitting at a time. All other systems are Hi-Z (ZBMCRX). The USB-PD Specification also
specifies the capacitance that can exist on the wire as well as a typical DC bias setting circuit for attach
detection.
Tx
Rx
Pullup for
Attach
Detection
CRECEIVER
Connector
CCablePlug_CC
Rx
Tx
Tx
Rx
Connector
Rx
Tx
RD for
Attach
Detection
Cable
Source
System
Sink
System
CRECEIVER
623¶ 3'
communication only
(eMarker #1)
623¶¶ 3'
communication only
(eMarker #2)
CC wire
CCablePlug_CC
Figure 8-10. Example USB-PD Multi-Drop Configuration
8.3.1.6 Squelch Receiver
The TPS25751 has a squelch receiver to monitor for the bus idle condition as defined by the USB PD
specification.
8.3.2 Power Management
The TPS25751 power management block receives power and generates voltages to provide power to the
TPS25751 internal circuitry. These generated power rails are LDO_3V3 and LDO_1V5. LDO_3V3 can also be
used as a low power output for external EEPROM memory. The power supply path is shown in Figure 8-11.
www.ti.com
TPS25751
SLVSH93 – OCTOBER 2023
Copyright © 2023 Texas Instruments Incorporated
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