Controller 48-Pin TQFP

The COM20022I is a member of the family of Embedded ARCNET Controllers from Standard Microsystems Corporation. The device is a general purpose communications controller for networking microcontrollers and intelligent peripherals in industrial, automotive, and embedded control environments using an ARCNET protocol engine. The small 48 pin package, flexible microcontroller and media interfaces, eight-page message support, and extended temperature range of the COM20022I make it the only true network controller optimized for use in industrial, embedded, and automotive applications. Using an ARCNET protocol engine is the ideal solution for embedded control applications because it provides a deterministic token-passing protocol, a highly reliable and proven networking scheme, and a data rate of up to 10 Mbps when using the COM20022I. A token-passing protocol provides predictable response times because each network event occurs within a predetermined time interval, based upon the number of nodes on the network. The deterministic nature of ARCNET is essential in real time applications. The integration of the 2Kx8 RAM buffer on-chip, the Command Chaining feature, the 10 Mbps maximum data rate, and the internal diagnostics make the COM20022I the highest performance embedded communications device available. With only one COM20022I and one microcontroller, a complete communications node may be implemented. New Features    Data Rates up to 10 Mbps    Selectable 8/16 Bit Wide Bus with Data Swapper    Programmable DMA Channel    Programmable Reconfiguration Times    48 Pin TQFP RoHS Compliant PackagesIdeal for Industrial/Factory/Building Automation and Transportation ApplicationsDeterministic (ANSI 878.1) Token Passing ARCNET ProtocolMinimal Microcontroller and Media Interface Logic RequiredFlexible Interface for Use with All Microcontrollers or MicroprocessorsAutomatically Detects Type of Microcontroller InterfaceFull 2K x 8 On-Chip Dual Port RAMCommand Chaining for Packet QueuingSequential Access to Internal RAMSoftware Programmable Node IDEight 256 Byte Pages Allow Four Pages TX and RX Plus Scratch-Pad MemoryNext ID ReadableInternal Clock Scaler and Clock Multiplier for Adjusting Network SpeedOperating Temperature Range of -40°C to +85°CSelf-Reconfiguring ProtocolSupports up to 255 NodesSupports Various Network Topologies (Star, Tree, Bus...)CMOS, Single +5V SupplyDuplicate Node ID DetectionPowerful DiagnosticsReceive All Packets ModeFlexible Media Interface:    Traditional Hybrid Interface for Long Distances up to Four Miles at 2.5 Mbps    RS485 Differential Driver Interface for Low Cost, Low Power, High Reliability