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USB PLUSPOWER SPECIFICATIONS
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The USB PlusPower specification was developed by an industry group as an addendum
to the USB standard. Its purpose is to define a standard method for bus powering
USB peripheral devices with higher power requirements than can be handled by
the USB standard.
As stated in this specification, “This document is one of a set of closely
related documents. The primary document is the USB Core Specification, which
constitutes the baseline specification…Only those characteristics that
differ from the baseline are defined in this document. That is, if a particular
mechanical or electrical characteristic … is not present in this document,
the user of this document must refer to the baseline document for those characteristics.”
The current version of the USB Core Specification may be downloaded from: http://www.usb.org/developers/docs/
The current version of the USB PlusPower specification may be downloaded here.
Revision History
The USB PlusPower specification is now at revision level 0.8f. For the complete
revision history, see below.
| Date |
Version |
Contents |
| 990326 |
0.8e |
Section 3.1.1.4 replaced (strange format) drawing
Section 3.1.2.3.2 Change voltage tolerance
Section 4.2.3 and 4.3.3, key position 2 current changes
Section 4.3.3, phrase added: “clamping diode” |
| 990308 |
0.8d |
Section 4: Power management section
replaced.
Section 3.1.2.3: Voltage tolerances
modified.
Section 3.1.1.7: TBD (Plug perspective)
removed.
Section 3.1.1.9: TBD (interface
dimensions) removed.
Section 2.1: Tertiary document
reference removed.
Section 1.4: TBD section removed. |
| 981109 |
0.8 |
Updated illustrations
Removed key positions 3 & 4
from Host connector description
Added current specs to Power
Mgmt section
Removed “optional” from Power Mgmt section |
| 981019 |
0.7D |
Section 1.1, IP Disclaimer: Added statement
Section 3.1, Upstream Connection:
Updated drawings
Section 3.2, Downstream Connection:
Added Polarizing Information
Updated Table of Contents |
| 981007 |
0.7C |
Section 1.3, Revision History: Put table in reverse order per committee
recommendation
Section 3.1, Upstream Connection:
Added paragraph describing 2 versions of PlusPower connector
Section 3.1.1.2, Key Position
Colors: Corrected color assignment table
Section 3.2, Downstream Connection:
Updated drawings with metric dimensions.
Section 3.2.2.3 Contact Assignments and Plugging Sequence: Added table |
| 980824 |
0.7B |
Section 3.2, Downstream Connection: Added details of recommended device
connector. Updated Table of Contents |
| 980707 |
0.7A |
Modified Outline Structure of Document
Section 3.1, Upstream Connection:
Added basic PlusPower description
Section 3.1.1, Mechanical: Added
information describing PlusPower connector including color information,
retention latch description and placeholder for interface dimensions
Section 3.1.2.4, Electrical:
Added Plugging Sequence
Section 3.2, Downstream Connection:
Reworded paragraph
Section 4.2.2, Safety Circuit:
Reworded paragraph to reflect IEC 950 reqmts.
Updated Table of Contents |
| 980629 |
0.6C |
Section 3.1, Mechanical: Added plug illustration (more to be added at
next revision)
Section 3.1.2 Downstream (Device-Side)
Connection: Added statement concerning captive cable assemblies.
Section 3.2.3.1, Key Position
1 Voltage Table: Removed note allowing variable voltages for key position
1.
Section 3.3, Power Management: Removed portion added for V 0.6B and added
simplified revision. |
| 980512 |
0.6B |
Section 3.1, Mechanical: Added illustrations (more to be added at a later
revision) Section 3.3, Power Management: Added definitions and details |
| 980415 |
0.6A |
Section 2.1, Scope: Modified description of ASCSI documents
Section 3.2, Electrical: Added
table showing voltage assignments
Section 3.3, Power Management: Added table describing power management
options |
| 980128 |
0.6 |
Initial Revision |
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