The 3.3V Neuron chip (CY7C53120L8/3150L) is a low-power version of the 5V Neuron chip with a number of feature enhancements. The CY7C53120L8/3150L Neuron chip implements a device for LonWorks distributed intelligent control networks. It incorporates, on a single chip, the necessary communication and control functions, both in hardware and firmware, that facilitate the design of a LonWorks device. The CY7C53120L8/3150L supports all the functionality of the 5V CY7C531x0 Neuron chip. Additionally it features 4KB of RAM, 8KB of Flash memory (CY7C53120L8), and hardware UART/SPI. The CY7C53120L8/3150L has an 11-pin configurable I/O block. The I/Os are all 5V-tolerant to allow interfacing to TTL Compatible 5V components and microcontrollers. The CY7C53120L8/3150L contains a very flexible five-pin communication port that can be configured to interface with a wide variety of media transceivers at a wide range of data rates. The communication port can operate at either 3.3V or 5V. In 5V mode the communication port is completely backward compatible with existing 5V transceivers. The most common transceiver types are twisted-pair, powerline, RF, IR, fiber-optics, and coaxial.