The Aardvark I2C/SPI Host Adapter is a fast and powerful I2C bus and SPI bus host adapter through USB. It allows a developer to interface a Windows, Linux, or Mac OS X PC via USB to a downstream embedded system environment and transfer serial 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 ban**idth USB versus slower RS-232.
· Supports standard mode (100 kbps) and fast (400 kbps) mode as 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 downstream devices.
· Repeated Start, 10-bit slave addressing, and Combined Format transactions.
The Aardvark 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)
Learn more 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 downstream devices.
· Software configurable Slave Select (SS) polarity in master mode.
Learn more 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 to interact with your target system.
· GPIO configuration is cached internally to preserve settings between operational modes.
Low Cost
The Aardvark adapter comes complete with a royalty-free API.
The low cost makes it affordable for a company to provide every developer with their own interface. The benefits of every developer having their own interface are:
· Less time wasted because developers do not have to share tools or go to the lab to debug simple problems.
· Less wasted time means higher productivity because developers can identify and fix problems quickly and easily with less down-time.
· Higher productivity means shorter development cycles. Projects get done on time and on budget
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