• Supports either Single-TT or Multi-TT configura-
tions for Full-Speed and Low-Speed connections
(when connected to a High-Speed host)
• Bypass Switch for low power single port operation
- Battery charging detection using a PMIC
- Stereo and mono/mic audio
- USB1.1 Data
• Enhanced configuration options available through
serial I
2
C Slave Port
- VID/PID/DID
- String Descriptors
- Configuration options for Hub
• Internal Default configuration option when serial
I
2
C host is not available
• MultiTRAK
TM
- Dedicated Transaction Translator per port
• PortMap
- Configurable port mapping and disable
sequencing
• PortSwap
- Configurable differential intra-pair signal
swapping
• PHYBoost
- Programmable USB transceiver drive
strength for recovering signal integrity
• VariSense
TM
- Programmable USB receiver sensitivity
• flexPWR
®
Technology
- Low current design ideal for battery powered
applications
- Internal supply switching provides low power
modes
• External 12, 19.2, 26, or 38.4 MHz clock input
• Internal 3.3V & 1.2V Voltage Regulators for single
supply operation
- External VBAT and 1.8V dual supply input
option
• Internal Short Circuit protection of USB differential
signal pins
• ±5kV HBM ESD Protection
• 25-pin WLCS (1.95mm x 1.95mm Wafer Level
Chip Scale) Package - 0.4mm ball pitch
Target Applications
The USB3803 is targeted for applications where more
than one USB port is required. As mobile devices add
more features and the systems become more complex,
it is necessary to have more than one USB port to com-
municate with internal and peripheral devices.
•
•
•
•
•
•
•
•
•
•
Mobile Phones
Ultra Mobile PCs
Tablet Computers
Digital Still Cameras
Digital Video Camcorders
Gaming Consoles
PDAs
Portable Media Players
GPS Personal Navigation Devices
Media Players/Viewers
2014-2018 Microchip Technology Inc.
DS00001691C-page 1
USB3803
TO OUR VALUED CUSTOMERS
It is our intention to provide our valued customers with the best documentation possible to ensure successful use of your Microchip
products. To this end, we will continue to improve our publications to better suit your needs. Our publications will be refined and
enhanced as new volumes and updates are introduced.
If you have any questions or comments regarding this publication, please contact the Marketing Communications Department via
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We welcome your feedback.
Most Current Data Sheet
To obtain the most up-to-date version of this data sheet, please register at our Worldwide Web site at:
http://www.microchip.com
You can determine the version of a data sheet by examining its literature number found on the bottom outside corner of any page.
The last character of the literature number is the version number, (e.g., DS30000000A is version A of document DS30000000).
Errata
An errata sheet, describing minor operational differences from the data sheet and recommended workarounds, may exist for cur-
rent devices. As device/documentation issues become known to us, we will publish an errata sheet. The errata will specify the
revision of silicon and revision of document to which it applies.
To determine if an errata sheet exists for a particular device, please check with one of the following:
• Microchip’s Worldwide Web site;
http://www.microchip.com
• Your local Microchip sales office (see last page)
When contacting a sales office, please specify which device, revision of silicon and data sheet (include -literature number) you are
using.
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to receive the most current information on all of our products.
DS00001691C-page 2
2014-2018 Microchip Technology Inc.
USB3803
Table of Contents
1.0 General Description ........................................................................................................................................................................ 4
2.0 Acronyms and Definitions ............................................................................................................................................................... 7
6.0 Serial Slave Interface .................................................................................................................................................................... 40
7.0 USB Descriptors ........................................................................................................................................................................... 44
Appendix A: Revision History .............................................................................................................................................................. 87
The Microchip Web Site ...................................................................................................................................................................... 88
Customer Change Notification Service ............................................................................................................................................... 88
Customer Support ............................................................................................................................................................................... 88
Product Identification System ............................................................................................................................................................. 89
2014-2018 Microchip Technology Inc.
DS00001691C-page 3
USB3803
1.0
GENERAL DESCRIPTION
The USB3803 is a family of low-power, USB 2.0 hub controllers with three downstream ports. “USB3803” is a generic
term referring to the entire family, which includes the following devices:
• USB3803C
• USB3803Ci
The USB3803 is available in two temperature ranges (commercial and industrial) and is recommended for new designs.
The USB3803 device includes an integrated USB bypass switch. This device-specific feature is called out independently
throughout the document.
Table 1-1
provides a summary of the feature differences between USB3803C and
USB3803Ci:
TABLE 1-1:
USB3803 FAMILY DIFFERENCES
USB Bypass Switch
X
X
0°C to +70°C
X
X
-40°C to +85°C
Part Number
USB3803C
USB3803Ci
The USB3803 can attach to an upstream port as a full-speed hub or as a full-/hi-speed hub and supports low-speed,
full-speed, and hi-speed (if operating as a hi-speed hub) downstream devices on all of the enabled downstream ports.
The USB3803 has been specifically optimized for mobile embedded applications. The pin-count has been reduced by
optimizing the USB3803 for mobile battery-powered embedded systems where power consumption, small package
size, minimal BOM, and battery charger detection capabilities are critical design requirements. Standby mode and
Bypass mode power has been minimized. Instead of a dedicated crystal, reference clock inputs are aligned to mobile
applications. Flexible integrated power regulators ease integration into battery powered devices. Automatic battery
charger detection is available on the upstream port. All required resistors on the USB ports are integrated into the hub.
This includes all series termination resistors on D+ and D– pins and all required pull-down and pull-up resistors on D+
and D– pins.
The integrated USB switch allows the USB3803 to bypass the USB Hub and directly connect the upstream and Port 3
downstream USB port for operational modes that do not require Hi-Speed media transfers. The bypass switch enables
multiple connectivity options to the USB port while preserving the high speed signal quality in USB Hub Mode.
The USB3803 integrated battery charger detection circuitry supports USB-IF 1.1 charger detection methods. These cir-
cuits are used to detect the attachment and type of a USB Charger and provide an interrupt output to the portable device
indicating that charger information is available to be read from USB3803 status registers via the serial interface.
The USB3803 includes programmable features such as:
MultiTRAK
TM
Technology
which utilizes a dedicated Transaction Translator (TT) per port to maintain consistent full-
speed data throughput regardless of the number of active downstream connections. MultiTRAK
TM
outperforms conven-
tional USB 2.0 hubs with a single TT in USB full-speed data transfers.
PortMap
which provides flexible port mapping and disable sequences. The downstream ports of a USB3803 hub can
be reordered or disabled in any sequence to support multiple platform designs with minimum effort. For any port that is
disabled, the USB3803 hub controllers automatically reorder the remaining ports to match the USB host controller’s port
numbering scheme.
PortSwap
which adds per-port programmability to USB differential-pair pin locations. PortSwap allows direct alignment
of USB signals (D+/D-) to connectors to avoid uneven trace length or crossing of the USB differential signals on the
PCB.
PHYBoost
which provides programmable levels of Hi-Speed USB signal drive
strength in the upstream and downstream port transceivers. PHYBoost attempts to
restore USB signal integrity in a compromised system environment. The graphic on
the right shows an example of Hi-Speed USB eye diagrams before and after PHY-
Boost signal integrity restoration.
VariSense
TM
which controls the USB receiver sensitivity enabling programmable lev-
els of USB signal receive sensitivity. This capability allows operation in a sub-optimal system environment, such as
when a captive USB cable is used.
DS00001691C-page 4
2014-2018 Microchip Technology Inc.
USB3803
1.1
Customer Selectable Features
A default configuration is available in the USB3803 following a reset. This configuration may be sufficient for most appli-
cations. The USB3803 hub may also be configured by an external microcontroller. When using the microcontroller inter-
face, the hub appears as an I
2
C slave device.
The USB3803 hub supports customer selectable features including:
•
•
•
•
•
•
•
•
Optional customer configuration via I
2
C
Compound devices on a port-by-port basis
Customizable vendor ID, product ID, and device ID
Configurable downstream port power-on time reported to the host
Indication of the maximum current that the hub consumes from the USB upstream port
Indication of the maximum current required for the hub controller
Configurable as a Self-Powered and Bus-Powered Hub
Custom string descriptors (up to 30 characters):
- Product string
- Manufacturer string
- Serial number string
• When available, I
2
C configurable options for default configuration may include:
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