TheAardvark I2C/SPI Host Adapter is a fast and powerful I2C bus and SPI bus hostadapter through USB. It allows a developer to interface a Windows, Linux, orMac OS X PC via USB to a downstream embedded system environment and transferserial messages using the I2C and SPI protocols.

　　Overview

　　I2C master and slave up to 800 kHz

　　I2C multi-master support

　　SPI master up to 8 MHz

　　SPI slave up to 4 MHz

　　GPIO with selectable pins

　　I2C

　　True 800 kbps performance over higher bandwidth USB versusslower RS-232.

　　Supports standard mode (100 kbps) and fast (400 kbps) modeas well as various speeds ranging from 1 kHz to 800 kHz.

　　Supports inter-bit and inter-byte clock stretching.

　　Supports multi-master.

　　Master transmit and receive.

　　Asynchronous slave transmit and receive.

　　Software configurable I2C pull-up resistors.

　　Software configurable target power pins to power downstreamdevices.

　　Repeated Start, 10-bit slave addressing, and CombinedFormat transactions.

　　TheAardvark I2C/SPI Host Adapter is compatible with:

　　Display Data Channel (DDC)

　　System Management Bus (SMBus)

　　Power Management Bus (PMBus)

　　Smart Battery Bus (SBBus)

　　Intelligent Platform Management Interface (IPMI)

　　Two-Wire Interface (TWI)

　　Learnmore about I2C in the I2C Background Article.

　　? Actual system bus speed may vary as a function of capacitance.

　　SPI

　　Operates in master or slave mode.

　　From 0.125 kHz up to 8 Mbps master signaling rate.

　　Up to 4 Mbps slave signaling rate.

　　Full duplex master transmit/receive.

　　Asynchronous slave transmit/receive.

　　Software configurable target power pins to power downstreamdevices.

　　Software configurable Slave Select (SS) polarity in mastermode.

　　Learnmore about SPI in the SPI Background article.

　　GPIO - General Purpose IO

　　I2C and SPI pins can be repurposed for more general use,allowing them to be used for custom signals on target systems.

　　GPIO functionality can also be combined with I2C or SPI tointeract with your target system.

　　GPIO configuration is cached internally to preservesettings between operational modes.

　　Low Cost

　　TheAardvark adapter comes complete with a royalty-free API.

　　Thelow cost makes it affordable for a company to provide every developer withtheir own interface. The benefits of every developer having their own interfaceare:

　　Lesstime wasted because developers do nothave to share tools or go to the lab to debug simple problems.

　　Less wasted time means higherproductivity because developers can identify and fix problems quickly andeasily with less down-time.

　　Higher productivity means shorter development cycles. Projects get done on time and on budget