Battery Charging Specification
`
`Revision 1.1
`
`April 15, 2009
`
`SAMSUNG ELECTRONICS CO., LTD., v. AFFINITY LABS OF TEXAS, LLC
`IPR2014-01181 EXHIBIT 2027 – 1
`
`

`
`Copyright © 2009, USB Implementers Forum, Inc.
`
`All rights reserved.
`
`A LICENSE IS HEREBY GRANTED TO REPRODUCE THIS SPECIFICATION FOR
`INTERNAL USE ONLY. NO OTHER LICENSE, EXPRESS OR IMPLIED, BY ESTOPPEL OR
`OTHERWISE, IS GRANTED OR INTENDED HEREBY.
`
`USB-IF AND THE AUTHORS OF THIS SPECIFICATION EXPRESSLY DISCLAIM ALL
`LIABILITY FOR INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS, RELATING
`TO IMPLEMENTATION OF INFORMATION IN THIS SPECIFICATION. USB-IF AND THE
`AUTHORS OF THIS SPECIFICATION ALSO DO NOT WARRANT OR REPRESENT THAT
`SUCH IMPLEMENTATION(S) WILL NOT INFRINGE THE INTELLECTUAL PROPERTY
`RIGHTS OF OTHERS.
`
`THIS SPECIFICATION IS PROVIDED "AS IS" AND WITH NO WARRANTIES, EXPRESS OR
`IMPLIED, STATUTORY OR OTHERWISE. ALL WARRANTIES ARE EXPRESSLY
`DISCLAIMED. NO WARRANTY OF MERCHANTABILITY, NO WARRANTY OF NON-
`INFRINGEMENT, NO WARRANTY OF FITNESS FOR ANY PARTICULAR PURPOSE, AND
`NO WARRANTY ARISING OUT OF ANY PROPOSAL, SPECIFICATION, OR SAMPLE.
`
`IN NO EVENT WILL USB-IF OR USB-IF MEMBERS BE LIABLE TO ANOTHER FOR THE
`COST OF PROCURING SUBSTITUTE GOODS OR SERVICES, LOST PROFITS, LOSS OF
`USE, LOSS OF DATA OR ANY INCIDENTAL, CONSEQUENTIAL, INDIRECT, OR SPECIAL
`DAMAGES, WHETHER UNDER CONTRACT ; TORT, WARRANTY, OR OTHERWISE,
`ARISING IN ANY WAY OUT OF THE USE OF THIS SPECIFICATION, WHETHER OR NOT
`SUCH PARTY HAD ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES.
`
`SAMSUNG ELECTRONICS CO., LTD., v. AFFINITY LABS OF TEXAS, LLC
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`Battery Charging Specification, Revision 1.1 (cid:9)
`
`April 15, 2009
`
`Contributors
`
`Mark Lai (cid:9)
`Sammy Mbanta (cid:9)
`Kenneth Ma (cid:9)
`Shimon Elkayam (cid:9)
`Dan Ellis (cid:9)
`Graham Connolly (cid:9)
`Joel Silverman (cid:9)
`Nathan Sherman (cid:9)
`Mark Rodda (cid:9)
`Juha Heikkila (cid:9)
`Richard Petrie (cid:9)
`Sten Carlsen (cid:9)
`Terry Rample, Chair (cid:9)
`Morgan Monks (cid:9)
`Dave HagIan (cid:9)
`Mark Bohm (cid:9)
`Morten Christiansen (cid:9)
`Nicolas Florenchie (cid:9)
`Patrizia Milazzo (cid:9)
`Shaun Reemeyer (cid:9)
`George Paparrizos (cid:9)
`Wei Ming (cid:9)
`Ivo Huber (cid:9)
`Pasi Palojarvi (cid:9)
`Mark Paxson (cid:9)
`Ed Beeman (cid:9)
`
`Allion Test Labs
`Astec Power
`Broadcom
`Broadcom
`DisplayLink
`Fairchild
`Kawasaki
`Microsoft
`Motorola
`Nokia
`Nokia
`Nokia
`Qualcomm
`SMSC
`SMSC
`SMSC
`ST Ericsson
`ST Ericsson
`ST Ericsson
`ST Ericsson
`Summit Microelectronics
`Telecommunication Metrology Center of MII
`Texas Instruments
`Texas Instruments
`USB-IF
`USB-IF
`
`Revision History
`
`Revision
`BC 1.0
`BC 1.1
`
`Date
`Mar 8, 2007
`April 15, 2009
`
`Author
`Terry Rample
`Terry Rample
`
`Description
`First release
`Major updates to all sections. Added Data
`Contact Detect protocol, and Accessory
`Charger Adapter.
`
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`Battery Charging Specification, Revision 1.1
`
`April 15, 2009
`
`Table of Contents
`
`1.
`
`Introduction (cid:9)
`1.1 (cid:9)
`Scope (cid:9)
`1.2 (cid:9) Background (cid:9)
`1.3 (cid:9) Reference Documents (cid:9)
`1.4 (cid:9) Definitions of Terms (cid:9)
`1.4.1 (cid:9)
`Attach versus Connect (cid:9)
`1.4.2 (cid:9)
`Downstream Port (cid:9)
`1.4.3 (cid:9)
`Standard Downstream Port (cid:9)
`1.4.4 (cid:9) Charging Downstream Port (cid:9)
`1.4.5 (cid:9)
`Dedicated Charging Port (cid:9)
`1.4.6 (cid:9) Charging Port (cid:9)
`1.4.7 (cid:9)
`USB Charger (cid:9)
`1.4.8 (cid:9)
`Portable Device (cid:9)
`1.4.9 (cid:9)
`Dead Battery Threshold (cid:9)
`1.4.10 Weak Battery Threshold (cid:9)
`1.5 Parameter Values (cid:9)
`2. Dead Battery Provision (cid:9)
`2.1 Background (cid:9)
`2.2 Provision Conditions (cid:9)
`2.2.1 (cid:9)
`Compliance Testing (cid:9)
`2.2.2 (cid:9)
`No Battery Case (cid:9)
`2.2.3 (cid:9)
`Dead/Weak/No Battery — No Connect (cid:9)
`2.2.4 (cid:9)
`Dead/Weak/No Battery — With Connect (cid:9)
`2.2.5 (cid:9)
`Current Usage — Direct Power Up (cid:9)
`2.2.6 (cid:9)
`Current Usage — Battery Charging (cid:9)
`2.2.7 (cid:9)
`Current Usage — Unrelated Modes (cid:9)
`2.2.8 (cid:9)
`Inrush Tests (cid:9)
`2.2.9 (cid:9)
`Drawing Current After Connect (cid:9)
`2.2.10 (cid:9) Connect and Disconnect (cid:9)
`2.2.11 (cid:9) Specify Connect Times (cid:9)
`2.3 OTG Considerations (cid:9)
`3. Charging Port Detection (cid:9)
`3.1 Overview (cid:9)
`3.2 Charger Detection Hardware (cid:9)
`3.2.1 (cid:9)
`Dedicated Charging Port (cid:9)
`3.2.2 (cid:9)
`Standard Downstream Port (cid:9)
`3.2.3 (cid:9) Charging Downstream Port (cid:9)
`3.3 Data Contact Detect (cid:9)
`3.3.1 (cid:9)
`Problem Description (cid:9)
`3.3.2 (cid:9)
`Hardware Detection (cid:9)
`3.3.3 (cid:9) Charger Detect Delay (cid:9)
`3.4 Charger Detection Timing (cid:9)
`3.4.1 (cid:9)
`High Speed (cid:9)
`3.4.2 (cid:9)
`Full Speed (cid:9)
`3.4.3 (cid:9)
`Low Speed (cid:9)
`3.4.4 (cid:9)
`Dead Battery (cid:9)
`3.5 Charging Current Limits (cid:9)
`3.6 Ground Current and Noise Margins (cid:9)
`3.6.1 (cid:9)
`Low-speed and Full-speed Communication (cid:9)
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`Battery Charging Specification, Revision 1.1 (cid:9)
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`April 15, 2009
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`3.6.2 (cid:9)
`High-speed Communication (cid:9)
`Charger Detect Output Signal (cid:9)
`3.7
`Signal Integrity (cid:9)
`3.8
`3.9
`Resistive Detection Mechanism (cid:9)
`4. Charging Specifications (cid:9)
`4.1 Charging Port (cid:9)
`4.2 Portable Devices (cid:9)
`4.3 Devices With Multiple Downstream Ports (cid:9)
`5. Parameter Values (cid:9)
`6. Accessory Charger Adapter (cid:9)
`6.1
`Introduction (cid:9)
`6.2 Adapter Ports (cid:9)
`6.3 Connectivity Options (cid:9)
`6.4 Architecture (cid:9)
`6.5 Modes of Operation (cid:9)
`6.6 Legacy Considerations (cid:9)
`6.7 Requirements (cid:9)
`6.8 Docking Station (cid:9)
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`FiCiUreS
`
`Figure 3-1 System Overview (cid:9)
`Figure 3-2 Dedicated Charging Port (cid:9)
`Figure 3-3 Standard Downstream Port (cid:9)
`Figure 3-4 Charging Downstream Port (cid:9)
`Figure 3-5 Data Pin Offset (cid:9)
`Figure 3-6 Data Contact Detect — No Remote Device (cid:9)
`Figure 3-7 Data Contact Detect — Standard Downstream Port (cid:9)
`Figure 3-8 Data Contact Detect — Dedicated Charging Port (cid:9)
`Figure 3-9 High-speed Charger Detection Timing (cid:9)
`Figure 3-10 Full-Speed Charger Detection Timing (cid:9)
`Figure 3-11 Low-Speed Charger Detection Timing (cid:9)
`Figure 3-12 Dead Battery Charger Detection Timing (cid:9)
`Figure 3-13 Charger Detect Output Signal (cid:9)
`Figure 4-1 Dedicated Charging Port Voltage versus Current (cid:9)
`Figure 4-2 Portable Device Current from Dedicated Charging Port (cid:9)
`Figure 4-3 Portable Device Current from Charging Downstream Port (cid:9)
`Figure 4-4 Current Limiting Example (cid:9)
`Figure 6-1 Accessory Charger Adapter Ports (cid:9)
`Figure 6-2 Charger Port Labeling and Indicator (cid:9)
`Figure 6-3 Accessory Charger Adapter Architecture (cid:9)
`Figure 6-4 Docking Station (cid:9)
`
`Tables
`
`Table 5-1 Voltages (cid:9)
`Table 5-2 Currents (cid:9)
`Table 5-3 Resistances (cid:9)
`Table 5-4 Capacitances (cid:9)
`Table 5-5 Times (cid:9)
`Table 6-1 Connectivity Options (cid:9)
`Table 6-2 Modes of Operation (cid:9)
`
`Acronyms
`
`Accessory Charger Adapter
`Dead Battery Provision
`Full Speed
`Global Positioning System
`High Speed
`Low Speed
`Personal Computer
`Physical Layer Interface for High Speed USB
`Start of Frame
`Targetted Peripheral List
`Universal Serial Bus
`USB Implementers Forum
`Voltage line of the USB interface
`
`ACA (cid:9)
`DBP (cid:9)
`FS (cid:9)
`GPS (cid:9)
`HS (cid:9)
`LS (cid:9)
`PC (cid:9)
`PHY (cid:9)
`SOF (cid:9)
`TPL (cid:9)
`USB (cid:9)
`USB-IF (cid:9)
`VBUS (cid:9)
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`Battery Charging Specification, Revision 1.1 (cid:9)
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`April 15, 2009
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`1. Introduction
`1.1 Scope
`The Battery Charging Working Group is chartered with creating specifications that define limits as well as
`detection, control and reporting mechanisms to permit devices to draw current in excess of the USB 2.0
`specification for charging and/or powering up from dedicated chargers, hosts, hubs and charging
`downstream ports. These mechanisms are backward compatible with USB 2.0 compliant hosts and
`peripherals.
`
`1.2 Background
`
`The USB ports on personal computers are convenient places for portable devices to draw current for
`charging their batteries. This convenience has led to the creation of USB Chargers that simply expose a
`USB standard-A receptacle. This allows portable devices to use the same USB cable to charge from either
`a PC or from a USB Charger.
`
`If a portable device is attached to a USB host or hub, then the USB 2.0 specification requires that after
`connecting, a portable device must draw less than:
`•
`2.5 mA average if the bus is suspended
`•
`100 mA if bus is not suspended and not configured
`•
`500 mA if bus is not suspended and configured for 500 mA
`
`If a portable device is attached to a USB Charger, it is allowed to draw a current of IDEV DCHG. If a portable
`device is attached to a charging downstream port, it is allowed to draw a current of IDEV COP LFS or
`IDEV CDP HS, regardless of suspend.
`
`In order for a portable device determine how much current it is allowed to draw from an upstream USB port,
`there needs to be mechanisms that allow the portable device to distinguish between a host or hub and a
`USB charger. This specification defines just such mechanisms.
`
`Since portable devices can be attached to USB chargers from various manufacturers, it is important that all
`USB chargers behave the same way. This specification defines the requirements for a USB charger. USB
`chargers that meet these requirements and pass the associated compliance tests are eligible to be added to
`the USB-IF Integrators List.
`
`If a portable device has a dead or weak battery, then the Connect Timing Engineering Change Notice (ECN)
`issued by the USB-IF on the USB 2.0 spec allows that device to draw up to 100 mA for a time of
`TSVLD CON WKB. The conditions associated with this ECN are contained in Section 2 of this specification,
`and are referred to as the Dead Battery Provision.
`
`1.3 Reference Documents
`The following specifications contain information relevant to the Battery Charging Specification.
`
`• OTG and Embedded Host Supplement, Revision 2.0
`• USB 2.0 Specification
`
`1.4 Definitions of Terms
`This section contains definitions for some of the terms used in this specification.
`
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`Battery Charging Specification, Revision 1.1 (cid:9)
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`April 15, 2009
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`1.4.1 Attach versus Connect
`
`This specification makes a distinction between the words "attach" and "connect". A downstream device is
`considered to be attached to an upstream port when there is a physical cable between the two.
`
`A downstream device is considered to be connected to an upstream port when it is attached to the upstream
`port, and when the downstream device has pulled either the D+ or D- data line high through a 1.5k0
`resistor, in order to enter low-speed, full-speed or high-speed signaling.
`
`1.4.2 Downstream Port
`
`In this specification, a Downstream Port refers to either a Standard Downstream Port or a Charging
`Downstream Port.
`
`1.4.3 Standard Downstream Port
`
`In this specification, a Standard Downstream Port refers to a downstream port on a device that complies with
`the USB 2.0 definition of a host or hub. A Standard Downstream Port expects a downstream device to draw
`less than 2.5 mA average when unconnected or suspended, up to 100 mA maximum when connected and
`not suspended, and up to 500 mA maximum if so configured and not suspended. A downstream device can
`be enumerated when it is connected to a Standard Downstream Port.
`
`A Standard Downstream Port pulls the D+ and D- lines to ground through a 15 kf") (typical) resistor.
`A Standard Downstream Port may have the ability to sense when a Portable Device is driving the D+ line to
`VDP SRC, and then react in some way. Portable Devices are required to drive D+ to VDP SRC whenever they
`draw more than IsusP while not connected, as described in the Dead Battery Provision.
`
`1.4.4 Charging Downstream Port
`
`A Charging Downstream Port is a downstream port on a device that complies with the USB 2.0 definition of a
`host or a hub, except that it is required to support the Charging Downstream Port features specified herein.
`
`When not in a USB session, a Charging Downstream Port outputs a voltage of VDM SRC on its D- line when
`it senses a voltage greater than VDAT REF but less than VLGC, on its D+ line.
`
`A Charging Downstream Port is capable of outputting a current of IcDP from VBUS at any time.
`
`1.4.5 Dedicated Charging Port
`
`A Dedicated Charging Port is a downstream port on a device that outputs power through a USB connector,
`but is not capable of enumerating a downstream device. A Dedicated Charging Port is required to output at
`a minimum current of IDCHG at an average voltage of VCHG.
`
`A Dedicated Charging Port is required to short the D+ line to the D- line.
`
`1.4.6 Charging Port
`
`A Charging Port is either a Dedicated Charging Port or a Charging Downstream Port.
`
`1.4.7 USB Charger
`
`A USB Charger is a device with a Dedicated Charging Port, such as a wall adapter or car power adapter.
`
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`1.4.8 Portable Device
`
`A Portable Device is considered to be any USB or OTG device that is capable of operating from its own
`battery, and is also capable of drawing current from USB for the purposes of operating and/or charging its
`battery.
`
`1.4.9 Dead Battery Threshold
`
`The Dead Battery Threshold is defined as the maximum charge level of a battery such that below this
`threshold, a device is assured of not being able to power up successfully.
`
`A Dead Battery is defined as one that is below the Dead Battery Threshold.
`
`1.4.10 Weak Battery Threshold
`
`The Weak Battery Threshold is defined as the minimum charge level of a battery such that above this
`threshold, a device is assured of being able to power up successfully.
`
`A Weak Battery is defined as one that is above the Dead Battery Threshold and below the Weak Battery
`Threshold. A device with a Weak Battery may or may not be able to power up a device successfully.
`A Good Battery is defined as one that is above the Weak Battery Threshold.
`
`1.5 Parameter Values
`Parameter names are used throughout the paper, instead of parameter values. All parameter values are
`found in Section 5.
`
`2. Dead Battery Provision
`
`2.1 Background
`The USB 2.0 specification allows a downstream device to draw a suspend current of up to 2.5 mA average
`from a Standard Downstream Port when the device is not connected or when the bus is suspended. If the
`bus is not suspended, then the device can draw up to 500mA, depending on the configuration the host
`enables.
`
`This limit of only 2.5 mA when not connected can be problematic for Portable Devices with a Dead Battery or
`a Weak Battery. Some Portable Devices require more than 100mA for several seconds just to power up.
`Thus, some Portable Devices with Dead Batteries or Weak Batteries may not be able to power up when
`attached to a Standard Downstream Port if they can only draw 2.8mA when not connected.
`
`After a Portable Device detects that it is attached to a Charging Port, it is allowed to draw up to 1.8A as
`described in Section 3.
`
`2.2 Provision Conditions
`Portable Devices that draw more than 2.5mA from a Downstream Port while not connected may still be
`certified, providing they meet the conditions specified below. These conditions are in addition to the
`compliance tests required for all devices.
`
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`2.2.1 Compliance Testing
`
`When submitting Portable Devices for compliance testing that use the Dead Battery Provision, the vendor
`shall provide a Dead Battery for the tests, and shall declare whether or not the Portable Device should be
`tested with no battery.
`
`2.2.2 No Battery Case
`
`Portable Devices that do not have a battery installed may also use the Dead Battery Provision, provided they
`meet the following requirements:
`
`•
`If a good battery were installed, the Portable Device would be able to run off of battery power
`• The case where the battery is not installed is an exceptional use case for this Portable Device, and
`not likely to occur very often, if at all.
`
`Bus-powered devices that do not normally have a battery are not eligible to use the Dead Battery Provision.
`Examples of such devices would include a bus-powered hub, bus-powered printer or bus-powered mouse.
`
`2.2.3 Dead/Weak/No Battery — No Connect
`
`Any USB device is allowed to draw a current of ISUSP for an unlimited amount of time from a Downstream
`Port when not connected.
`
`In addition to this, a Portable Device with a Dead Battery, Weak Battery or no battery is allowed to draw luNrr
`from a Downstream Port for up to TUNIT ISUSP after attaching, in order to determine if it will likely be able to
`connect. If, after this time, the Portable Device determines that it definitely will not be able to connect, then
`the Portable Device shall reduce its current draw to less than IsusP.
`
`For example, consider a Portable Device that does not have a battery installed. If it needed the battery to
`get to a state where it could connect, then the Portable Device can only draw current for TUNIT ISUSP to
`determine that it will never be able to connect.
`
`2.2.4 Dead/Weak/No Battery — With Connect
`
`A Portable Device with a Dead Battery, Weak Battery or no battery is allowed to draw luNrr from a
`Downstream Port under the following conditions.
`
`• Portable Device shall drive the D+ line to VDP SRC from the time it starts drawing more than ISUSP,
`until the time that it connects
`• Portable Device shall use this current to get to a state where it connects and enumerates
`• Portable Device shall not draw more than ISUSP after a time of TSVLD CON WKB plus TCON ISUSP
`from detecting a voltage on VBUS
`
`See Section 3.4.4 for timing details.
`
`In contrast, a self powered device or portable device with a good battery is not allowed to draw more than
`ISUSP after a time of TSVLD CON PWD plus TCON ISUSP from detecting a voltage on VBUS.
`
`2.2.5 Current Usage — Direct Power Up
`If a Portable Device is able to power up, connect and enumerate with less than IUNIT, then such a device
`with a Dead Battery or Weak Battery is allowed to use the current from a Downstream Port to power up
`directly.
`
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`2.2.6 Current Usage — Battery Charging
`
`If a Portable Device is not able to power up and connect with less than luNrr, then such a device with a Dead
`Battery or Weak Battery is allowed to use IUNIT from the Downstream Port to first charge its battery to its
`Weak Battery Threshold. Upon reaching its Weak Battery Threshold, the Portable Device is required to
`power up, connect and enumerate.
`
`2.2.7 Current Usage — Unrelated Modes
`
`The Portable Device is not allowed to delay connecting and enumerating in order to go into modes that are
`unrelated to powering up, connecting and enumerating. Such modes might include, but are not limited to:
`
`• Charging the battery beyond the Weak Battery Threshold
`• Making a phone call
`• Playing a game, song or video
`• Establishing a wireless connection such as Bluetooth or WiFi or GPS
`
`2.2.8 Inrush Tests
`
`A Portable Device with a Dead Battery, Weak Battery or no battery shall pass inrush tests.
`
`2.2.9 Drawing Current After Connect
`
`After a Portable Device with a Dead Battery, Weak Battery or no battery connects, it is allowed to draw up to
`luNIT for TCON ISUSP. After TCON ISUSP, the device is required to comply with the USB 2.0 specification rules
`for going into the suspended state.
`
`2.2.10 Connect and Disconnect
`
`A Portable Device is allowed to draw more than IsusP under the Dead Battery Provision only when it is
`disconnected.
`
`A Portable Device is allowed to connect and disconnect multiple times from when it first detects VBUS until
`TSVLD CON WKB later.
`
`After TSVLD CON WKB plus TCON ISUSP from detecting VBUS, a Portable Device must not draw more than
`ISUSP when it is disconnected, regardless of the state of its battery.
`
`2.2.11 Specify Connect Times
`When applying to use the Dead Battery Provision for a Portable Device, the vendor shall specify both the
`typical and maximum times that a device with a Dead Battery, Weak Battery or no battery will take to
`connect after being attached to a Downstream Port. These attach to connect times shall assume a new
`battery and room temperature.
`
`2.3 OTG Considerations
`A Portable Device with a Dead Battery cannot differentiate between a PC and an OTG A-device. Thus, the
`Portable Device will treat both the same.
`
`If an OTG A-device is connected to a Portable Device with a dead battery, then the OTG A-device is under
`no obligation to provide any more current than it normally would to any device on its Targeted Peripheral List
`(TPL).
`
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`If a Portable Device with a Dead Battery draws more current than the OTG A-device can provide, then the
`OTG A-device is allowed to end the session by dropping VBUS. If the Portable Device does not connect
`before the OTG A-device would normally time out the session, then the OTG A-device is allowed to end the
`session by dropping VBUS.
`
`3. Charging Port Detection
`3.1 Overview
`Figure 3 -1 is a block diagram showing a Portable Device attached to a USB port.
`
`Connector
`
`Cable
`
`Optional
`Connector
`
`Portable
`Device
`
`VBUS
`
`D-
`
`ID
`
`GND
`
`VBUS
`
`D-
`
`D+
`
`GND
`
`Host, Hub,
`or
`USB Charger
`
`Figure 3-1 System Overview
`
`Upon being attached to a USB port, a Portable Device detects that the voltage on VBUS is greater than its
`session valid voltage. For peripheral only devices, the session valid voltage can be between 0.8V to 4.0V.
`For OTG devices, the session valid voltage can be between 0.8V to 2.0V.
`
`A Portable Device that does not support charger detection will assume that it is attached to a Standard
`Downstream Port and the Dead Battery Provision as defined in Section 2 will apply. A Portable Device that
`does support charger detection can check if the upstream port is a Standard Downstream Port or a Charging
`Port. If such a Portable Device is attached to a Charging Port, then it is allowed to draw currents as defined
`in Section 3.4.
`
`The requirements specified in the following subsections for Portable Devices only apply to Portable Devices
`that implement the charger detection mechanism being described in that subsection.
`
`3.2 Charger Detection Hardware
`This section briefly describes the hardware used to do charger detection. The following sections provide
`more details of its operation.
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`April 15, 2009
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`3.2.1 Dedicated Charging Port
`
`Figure 3-2 shows a Portable Device attached to a Dedicated Charging Port.
`
`Portable Device
`
`Dedicated Charging Port
`
`RDAT LKG
`
`VDAT LKG
`
`VDP_SRC
`
`—ce-
`
`-e
`
`IDP_SRC
`
`.-
`
`PHY
`
`CHG_DET
`
`- — VDAT REF
`
`RDAT LKG
`
`
`
`VDAT_LKG
`
`IDM_SINK
`
`I /
`
`RDM_DWN
`
`VBUS
`D+
`
`ID
`
`GND
`
`RDCHG_DAT
`
`Figure 3-2 Dedicated Charging Port
`
`The Portable Device contains a current source, IDP SRC, and a pull-down resistor, RDM OWN, which are used
`to detect when the data pins of the plug have made contact with the data pins of the receptacle. See
`Section 3.3 for more details.
`
`The Portable Device also contains a voltage source, VDP SRC, a current sink, IDM SINK, and a comparator,
`VDAT REF, for determining whether the Portable Device is attached to a Charging Port or a Standard
`Downstream Port.
`
`As shown above, the Portable Device is attached to a Dedicated Charging Port. A Dedicated Charging Port
`is required to short the D+ and D- lines with a resistance of RDCHG DAT. The Portable Device first checks
`that the connector pins have made contact by turning on IDP SRC and RDM DWN. If the pins have made
`contact, then D+ goes low.
`
`To detect the presence of a Dedicated Charging Port, the Portable Device turns on VDP SRC and IDM SINK.
`If nothing is attached to the Portable Device, then D- gets pulled to ground by lom SINK. The voltage on D- is
`less than VDAT REF, so the CHG_DET signal is low. If a Dedicated Charging Port is attached to the Portable
`Device, then the voltage on D- is VDP SRC. This is greater than VDAT REF and less than VLGC, so the
`CHG_DET signal is high.
`
`The charger detection mechanism is defined such that it will work when the PHY has a leakage resistance of
`RDAT LKG and a leakage voltage of VDAT LKG.
`
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`Battery Charging Specification, Revision 1.1
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`April 15, 2009
`
`3.2.2 Standard Downstream Port
`
`Figure 3-3 shows a Portable Device attached to a Standard Downstream Port.
`
`Portable Device
`
`VBUS
`D+
`
`RDAT LKG
`
`VDAT_LKG
`
`PHY
`
`CHG_DET
`
`RDAT_LKG
`
`
`VDAT LKG
`
`VDP_SRC
`
`—e-
`
`
`
`ID P_S RC
`
`- — VDAT REF
`
`I DM_SINK
`
`I
`
`i
`
`RDM_DWN
`
`Standard Downstream Port
`
`i RDP_DWN
`
`RDAT LKG
`
`VDAT_LKG
`
`PHY
`
`RDAT LKG
`
`VDAT_LKG
`
`ID
`
`GND
`
`i RDM_DVVN
`
`Figure 3-3 Standard Downstream Port
`When the Portable Device turns on VDP SRC and IDM SINK, the D- line remains below VDAT REF, and the
`CHG_DET signal is not asserted. The Portable Device knows that it is not attached to a Charging Port.
`
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`Battery Charging Specification, Revision 1.1
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`April 15, 2009
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`3.2.3 Charging Downstream Port
`
`Figure 3-4 shows a Portable Device attached to a Charging Downstream Port.
`
`Portable Device
`
`VBUS
`
`D+
`
`Charging Downstream Port
`
`RDAT LKG
`
`VDAT_LKG
`
`PHY
`
`CHG_DET
`
`RDAT_LKG
`
`
`
`VDAT LKG
`
`VDP_SRC -cr"-
`
`RDP_DWN
`
`''' —0
`
`IDP_SRC
`
`- — VDAT_REF
`
`IDM_SINK
`
`/
`
`RDM DVVN
`
`D-
`
`ID
`
`GND
`
`VDAT_REF — -
`
`PRTBL_DET
`
`IDP_SINK
`
`VDM_SRC
`
`DM_DWN
`
`RDAT LKG
`
`VDAT LKG
`
`PHY
`
`RDAT LKG
`
`VDAT_LKG
`
`Figure 3 -4 Charging Downstream Port
`As before, the Portable Device turns on VDP SRC and IDM SINK to check if it is attached to a Charging Port.
`When the Charging Downstream Port detects that D+ is greater than VDAT REF and less than VLGC, then
`PRTBL_DET is asserted and the Charging Downstream Port knows that a Portable Device is attached. The
`Charging Downstream Port responds by driving a voltage of VDM SRC onto D-. This causes the CHG_DET
`signal in the Portable Device to be asserted, and the Portable Device knows that it is attached to a Charging
`Port.
`
`Once the Portable Device knows that it is attached to a Charging Port, it can distinguish between a
`Dedicating Charging Port and a Charging Downstream Port by pulling either D+ or D- to a logic high. If the
`Portable Device is attached to a Dedicated Charging Port, then the other data line will go high as well. If the
`Portable Device is attached to a Charging Downstream Port, then the other data line will stay low.
`
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`3.3 Data Contact Detect
`
`3.3.1 Problem Description
`
`USB plugs and receptacles are designed such that when the plug is inserted into the receptacle, the power
`pins make contact before the data pins make contact. This is illustrated in Figure 3-5.
`
`Plug (cid:9)
`
`Receptacle
`
`VBUS
`
`D+
`
`GND
`
`VBUS
`
`D+
`
`GND
`
`Figure 3-5 Data Pin Offset
`
`As a result, when a Portable Device is attached to an upstream port, the Portable Device will detect VBUS
`before the data pins have made contact. The time between power pins and data pins making contact
`depends on how fast the plug is inserted into the receptacle. Delays of more than several hundred
`milliseconds have been observed.
`
`The way that a Portable Device distinguishes between a Charging Port and a Standard Downstream Port is
`to look at the data lines. If the Portable Device makes a decision before the data pins have made contact,
`then the Portable Device will determine that it is attached to a Standard Downstream Port.
`
`If a Portable Device is attached to a Charging Port, and incorrectly determines that it is attached to a
`Standard Downstream Port, then the following would occur. The Portable Device will connect, and wait to
`be enumerated. While waiting to be enumerated, the Portable Device would only be allowed to draw IsusP,
`even though it was attached to a Charging Port.
`
`• To avoid this situation, the Portable Device is required to detect when the data pins have made
`contact.
`
`3.3.2 Hardware Detection
`
`In order to detect when the data pins have made contact, the Portable Device is required to pre-bias the data
`pins in such a way that when contact is made, at least one of the data pins changes state. Once this state
`change has been detected, the Portable Device is then allowed to check if it is attached to a Charging Port
`or a Standard Downstream Port.
`
`This section describes a contact detect mechanism that works with worst case resistances allowed by the
`USB 2.0 spec, for both the Portable Device and remote device. If the Portable Device is known to have
`resistances that are tighter than those allowed by the USB 2.0 spec, or if the Portable Device uses a
`comparator instead of a the single ended receiver, then the Portable Device is allowed to use a different
`method for pre-biasing the data pins. However, whatever method is used is required to work for worst case
`resistances in the remote device.
`
`The recommended method for Data Contact Detection is for the Portable Device to use a current source on
`the D+ line. When the Portable Device detects that VBUS is asserted, it turns on the current source,
`IDP SRC, on D+, and turns on the pull-down resistor, RDM DWN, on D-. If nothing is attached to the Portable
`
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`April 15, 2009
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`Device, the D+ line stays high. When either a Charging Port or Standard Downstream Port is attached to
`the Portable Device, the D+ line goes low.
`
`Figure 3-6 shows the case where nothing is attached to the Portable Device.
`
`Portable Device
`
`LGC_HI
`
`IDP_SRC
`
`D+
`(> 2.0V)
`
`300k
`
`Figure 3-6 Data Contact Detect — No Remote Device
`The current source, 1DP SRC, is pulling the D+ line high. As per the USB 2.0 spec, the PHY is allowed to
`have an input impedance of 300kfl. If this 300k0 were pulling D+ to ground, then the minimum current
`required to keep D+ at logic high is:
`
`•
`
`1DP SRC > V / R = 2V / 300kil = 7uA
`
`Figure 3-7 shows the case where the Portable Device is attached to a Standard Downstream Port.
`
`Portable Device
`
`Standard Downstream Port
`
`LGC_LO
`
`3.6V
`
`1DP_SRC
`
`300k
`
`D+
`(< 0.8V)
`
`3.6V
`
`1 300k
`
`24.8k
`
`Figure 3-7 Data Contact Detect — Standard Downstream Port
`
`In this case, the D+ line should go to a logic low when the Portable Device is attached to a Standard
`Downstream Port. The pull-down resistor in the Standard Downstream Port is pulling the D+ line low, and
`could have a value as high as 24.8kf2. The leakage current from the Portable Device and Downstre