USB3803 datasheet(4/99 Pages) MICROCHIP

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USB3803

DS00001691B-page 4

 2014-2015 Microchip Technology Inc.

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

• USB3803B

• USB3803Bi

The USB3803 is available in two functional revisions (USB3803B and USB3803C) and two temperature ranges (com-

mercial and industrial). USB3803C is recommended for new designs. The difference between functional revisions is the

inclusion of an integrated USB bypass switch in the USB3803C device. This device specific feature, which does not

pertain to the USB3803B, is called out independently throughout the document. Table 1-1 provides a summary of the

feature differences between family members.

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 (USB3803C only) 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. Auto-

matic 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 resis-

tors on D+ and D– pins.

The integrated USB switch (USB3803C only) allows the USB3803C 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:

MultiTRAKTM 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. MultiTRAKTM 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.

TABLE 1-1:

USB3803 FAMILY DIFFERENCES

Part Number

USB Bypass Switch

0°C to +70°C

-40°C to +85°C

USB3803C

USB3803Ci

USB3803B

USB3803Bi

USB3803 Datasheet(PDF) 4 Page - Microchip Technology

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