Controller Chip Ties Parallel Buses To The Serial I²C Bus

The first parallel-to-serial I²C interface lets designers add I²C interfaces to any digital system. The PCA9564 controller provides a 400-kHz I²C serial bus and operates from 2.5 to 3.3 V. The chip is optimized to interface to the 8051-family of microcontrollers. It can also be used with most other processor and DSP chips, and it enables multiple I²C devices or SMBus components to tie into the processor. It can operate as an I²C master or slave and as a transmitter or receiver. At the same time, it controls all of the I²C-bus specific sequences, protocol, arbitration, and timing, with no external clock source required. The controller is available in a 20-pin small-outline, TSSOP, or HVQFN package. It costs $2.25 each in lots of 10,000 units.