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TPS25820 Datasheet(PDF) 10 Page - Texas Instruments

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No. de pieza TPS25820
Descripción Electrónicos  TPS25821 USB Type-C 1.5-A Source Controller and Power Switch
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Fabricante Electrónico  TI1 [Texas Instruments]
Página de inicio  http://www.ti.com
Logo TI1 - Texas Instruments

TPS25820 Datasheet(HTML) 10 Page - Texas Instruments

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TPS25820, TPS25821
SLVSE24 – NOVEMBER 2017
www.ti.com
Product Folder Links: TPS25820 TPS25821
Submit Documentation Feedback
Copyright © 2017, Texas Instruments Incorporated
7 Detailed Description
7.1 Overview
The TPS25820 and TPS25821 devices are highly integrated USB Type-C source controllers with built-in power
switches developed for the USB Type-C connector and cable. The TPS25820 supports VCONN, while the
TPS25821 does not. The devices provide all of the functionality needed to support a USB Type-C DFP in a
system where USB power delivery (PD) source capabilities (for example, VBUS > 5 V) are not implemented. The
devices are designed to be compliant to the USB Type
‑C specification, release 1.3 which added new
requirements to discharge VCONN.
7.1.1 USB Type C Basic
For a detailed description of the Type-C spec refer to the USB-IF website to download the latest released
version. Some of the basic concepts of the Type-C spec that pertains to understanding the operation of the
TPS25820/21 (a Downward Facing Port, DFP device) are described as follows.
USB Type-C removes the need for different plug and receptacle types for host and device functionality. The
Type-C receptacle replaces both Type-A and Type-B receptacles since the Type-C cable is plug-able in either
direction between host and device. A host-to-device logical relationship is maintained via the configuration
channel (CC). Optionally hosts and devices can be either providers or consumers of power when USB PD
communication is used to swap roles.
All USB Type-C ports operate in one of below three data modes:
Host mode: the port can only be host (also provider of power)
Device mode: the port can only be device (also consumer of power)
Dual-Role mode: the port can be either host or device
Port types:
DFP (Downstream Facing Port): Host, specifically associated with flow of data (Host or Hub) in a USB link
Source: Port that asserts Rp (pull-up resistor) on CC pin and provides power on VBUS when attached to a
Sink (device). At power-up a DFP is a source.
UFP (Upstream Facing Port): Device, specifically associated with flow of data (device) in a USB link
Sink: Port that asserts Rd (pull-down) on CC pin and consumes power from VBUS when attached. At power-
up a UFP is a sink
DRP (Dual-Role Port): Host or Device
Valid Source-to-Sink connections:
Table 1 describes valid Source-to-Sink connections
Source to Source or Sink to Sink have no function
Table 1. Valid Source-to-Sink Connections
POWER ROLES
SOURCE ONLY
SINK ONLY
DUAL ROLE POWER (DRP)
Source Only
Not allowed
Allowed
Allowed
Sink Only
Allowed
Not allowed
Allowed
Dual Role Power
(DRP)
Allowed
Allowed
Allowed
7.1.2 Configuration Channel
The function of the configuration channel is to detect connections and configure the interface across the USB
Type-C cables and connectors.
Functionally the Configuration Channel (CC) is used to serve the following purposes:
Detect connect to the USB ports
Resolve cable orientation and twist connections to establish USB data bus routing
Establish Source and Sink roles between two connected ports
Discover and configure power: USB Type-C current modes or USB Power Delivery
Discovery and configure optional Alternate and Accessory modes


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