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USB controller LSI includes dedicated software

Posted: 29 Aug 2008     Print Version  Bookmark and Share

Keywords:USB controller LSI  dedicated software  interface tools  embedded devices 


Seiko Epson Corp. has developed the S1R72U01, a USB controller LSI that includes dedicated software for connecting a mouse or keyboard. Recently, the principles of universal design have been employed in various devices, highlighting a growing trend towards ease of use. As interface tools that are very inexpensive and easy-to-use, the mouse and keyboard are increasingly being used with embedded devices other than personal computers. However, before connection between a mouse or keyboard and an embedded device can actually be achieved, developers must deal with the following issues:

- Acquisition of USB know-how

- USB software development requires a lengthy time period and many man-hours

- Inexpensive CPUs in the 8bit and 16bit class are not equipped with USB host functions

Epson's newly-developed S1R72U01 incorporates all the USB software to enable connection with a mouse or keyboard in the chip, thus making it unnecessary for developers to have any knowledge at all about USB. Moreover, this product is able to connect with and control inexpensive CPUs in the 8-bit and 16-bit class and allows quick and easy connection with a mouse or keyboard and embedded devices.

Main Features:

* Easy to use—Requires absolutely no knowledge of USB; control is possible with UART serial interface

* Ideal for small systems—Control is possible with 8bit or 16bit CPU; package is small; compatible with various clocks

* Compatible with mouse and keyboard—Equipped with human interface device class and USB host stack; development of USB software is completely unnecessary

* Easy connection—UART serial interface allows for easy connection with CPU

* Compatible with single source—Operates on single 3V to 5.5V power source Small package QFN, 7mm square, 48-pin; QFP, 9mm square, 48-pin


1) USB host functions

- Equipped with 1 USB host port

- Incorporates USB software

- USB host stack; Human interface device class

- Full-speed mode (12Mbps) and low-speed mode (1.5Mbps)

- Incorporates host termination function

- VBUS power supply (when using this function, 5V power supply is necessary)

2) Others

- CPU interface—UART serial interface

- Power supply voltage—Single 3V to 5.5V power supply, CPU interface = 1.8V to 5V

- External clock—12MHz and 24MHz crystal oscillator and ceramic resonator (direct input of 12MHz and 24MHz is possible)

- Package—QFN package: 7mm square, 0.5mm pitch, 48-pin, QFP package: 9mm square (including lead), 0.5mm pitch, 48-pin

- Operating temperature range -40°C to +85°C

- Samples—Now shipping Rs.257.15 ($6 US)

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