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TPS25820 Datasheet(PDF) 10 Page - Texas Instruments |
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TPS25820 Datasheet(HTML) 10 Page - Texas Instruments |
10 / 35 page 10 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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