Interface Guide

26

USB Hub Controllers and Peripheral Devices

➔

Universal Serial Bus (USB)

The USB standard defines a bus product that requires a host controller and enables plug-and-play connectivity .

The most recently released final specification, USB 2 .0, defines high speed and allows complete backward compatibility with USB 1 .1 .

USB products fall into three categories: hubs, host controllers and peripherals .

USB 1 .1 supported speeds of up to

12 Mbps and cables up to 5 meters long for these devices . USB 2 .0 extends the connection speed to 480

Mbps to support next-generation peripherals of higher-performance PCs and applications . USB 2 .0 officially defines three speeds: low (1.5 Mbps), full (12 Mbps) and high (480 Mbps) .

The lowest speed is ideal for human interface devices such as a mouse, game pad or keyboard; while full speed is well suited for “data dumps” to the

PC via digital still cameras, PDA cradles and flash-card readers . Modems, printers, scanners and storage drives are just a few of the items that can take advantage of USB’s highest speed specification .

The USB On-The-Go (OTG) supplement to USB 2 .0 specifies a new class of devices aimed at the portable market . USB OTG defines devices that can operate as standard

USB peripherals when connected to a standard USB host controller .

However, these same devices can operate as reduced-function host controllers to support selected

USB OTG peripheral devices . Endequipment manufacturers can specify what type of peripherals their devices will support when in OTG host mode .

This new specification allows easy sharing of contact information between

USB OTG PDAs and cell phones or printing of photographs directly from an OTG-enabled digital still camera without a PC .

Technical Information

Speed

• The USB 2.0 standard defines three speeds: low speed (LS) 1.5 Mbps, full speed (FS) 12 Mbps and high speed (HS) 480 Mbps . It requires full backward and forward compatibility for devices and cables . All three modes offer both asynchronous and isochronous (real-time) data transmission over a simple and inexpensive 4-wire cable to meet requirements of peripherals including keyboards, mice, printers, speakers, scanners, external storage devices and digital still cameras .

Transfer Type

• USB 2.0 defines four types of transfers: bulk, control, interrupt and isochronous . Bulk transfer is intended for applications such as printers, scanners and mass storage, where latency isn’t critical but accuracy is . All devices must include control transfers for configuration . Interrupt transfer is for devices such as mice, keyboards and game pads that must receive the host’s or device’s attention periodically . Isochronous transfer offers guaranteed delivery time but no error-checking or automatic retransmission of data received with errors, making it the better choice for audio or video applications .

RS232/lrDA Serial-to-USB Converter

TUSB3410

Get samples, datasheets, evaluation modules and app reports at:

www.ti.com/sc/device/ TUSB3410

USB-to-Serial Bridge

The TUSB3410 provides an easy way to move a serial-based legacy device to a fast, flexible USB interface by bridging between a USB port and an enhanced UART serial port . The

TUSB3410 contains all the necessary logic to communicate with the host computer using the USB bus .

Key Features

• USB full-speed compliant: data rate of 12 Mbps

• 8052 microcontroller with 16 Kbytes of RAM that can be loaded from the host or from external onboard memory via an I

2 C bus

• Integrated, enhanced UART features including:

Programmable software/hardware flow control

Automatic RS-485 bus transceiver control, with and without echo

Software-selectable baud rate from

50 to 921 .6 kbaud

Built-in, two-channel DMA controller for USB/UART bulk I/O

• Evaluation module to jump-start

USB development or for use as a complete USB-to-RS232 converter

Host

(PC or OTG DRD)

Out

USB

In

TUSB3410

S

OUT

S

IN

Legacy

Serial

Peripheral

Applications

• Handheld meters

• Health metrics/monitors

• Any legacy serial device that needs to be upgraded to USB

TUSB3410 data flow.

Interface Guide

Texas Instruments 1Q 2009

USB Hub Controllers and Peripheral Devices

➔

27

USB Devices

USB Hub Controllers

TUSB2036

TUSB2046B

TUSB2077A

TUSB2136

TUSB5052

USB family of products.

USB Peripherals

TUSB3210

TUSB3410

TUSB6250

USB OTG

TUSB6020

USB PHY

TUSB1105

TUSB1106

TUSB2551

USB Selection Guide

Device Speed

USB Hub Controllers

TUSB2036 Full (1.1)

TUSB2046B

TUSB2077A

TUSB2136

TUSB5052

Full (1.1)

Full (1.1)

Full (1.1)

Full (1.1)

Ports I

2

C

2/3

4

7

1/2

1-5

Voltage

(V)

No

No

No

Yes

Yes

Voltage

(V)

3.3

3.3

3.3

3.3

3.3

Remote

Wakeup

Package

32 LQFP

32 LQFP

48 LQFP

64 LQFP

100 LQFP

Description

2/3-Port Hub for USB with Optional Serial EEPROM Interface

4-Port Hub for USB with Optional Serial EEPROM Interface

7-Port USB Hub with Optional Serial EEPROM Interface

2-Port Hub with Integrated General-Purpose Function Controller

5-Port Hub with Integrated Bridge to Two Serial Ports

Price*

1.15

1.20

1.95

3.25

5.10

Device

USB Peripherals

TUSB3210

TUSB3410

TUSB6015

TUSB6250

Speed

Full

Full

High

Full, High

3.3

3.3

1.5, 1.8, 3.3

3.3

Voltage

(V)

Yes

Yes

Yes

Yes

Package

64 LQFP

32 LQFP

80 BGA

80 TQFP

Local Bus

Interface

Description

USB Full-Speed General-Purpose Device Controller

USB-to-Serial Converter (RS-232, RS-485)

USB 2.0 High-Speed to Muxed NOR Flash Bridge Controller

USB 2.0 High-Speed, Low-Power ATA/ATAPI Bridge Solution

Price*

2.50

2.25

2.80

Device Speed

USB On-The-Go (OTG)

TUSB6020 High 1.5, 1.8, 3.3

Package(s)

80 QFP VLYNQ™

Description

USB 2.0 High-Speed On-The-Go to Local Bus Interface Controller

Price*

Web

Device

USB Transceivers

TUSB1105

TUSB1106

TUSB2551

Speed

Full, Low

Full, Low

Full, Low

Voltage

(V)

1.6, 3.6

1.6, 3.6

1.6, 3.6

Package(s)

16RTZ, 16RGT

16RTZ, 16PW

14PW, 16RGT

Single ended

Input

Yes

No

No

Description

USB Transceivers

USB Transceivers

USB Transceivers

*Suggested resale price in U.S. dollars in quantities of 1,000.

USB Port Protection –

Transient voltage suppressor protects USB 1.1 devices from ESD and electrical noise transients.

Device Description

USB Port Protection

SN65220 Single Suppressor

SN65240 Dual Suppressor

SN75240 Dual Suppressor

*Suggested resale price in U.S. dollars in quantities of 1,000.

Temp Range

(°C)

–40 to 85

–40 to 85

0 to 70

Price*

0.33

0.41

0.38

Price*

Web

Web

Web

Resources

For a complete list of resources (evaluation modules, data sheets and application notes), visit interface.ti.com

Literature Number Description

Application Notes

SLLA122 Selection and Specification of Crystals for Texas Instruments USB

2.0 Devices

SLLA154 VIDs, PIDs and Firmware: Design Decisions When Using TI USB

Device Controllers

SLLU043

SLLA170B

SLLAA276

TUSB3410 UART Evaluation Board

USB/Serial Applications Using TUSB3410/5052 and the VCP Software

MSP430 USB Connectivity Using TUSB3410

Texas Instruments 1Q 2009

Interface Guide