Features: · High Performance/Low Cost
· Microcontroller Based on Popular 8051
Architecture
· Intel 8051 Instruction Set Compatible
· Drop-In Replacement for 80C32 PLCC
· Network Supports up to 255 Nodes
· Powerful Network Diagnostics
· Maximum 507 Byte Packets
· Duplicate Node ID Detection
· Self-Configuring Network Protocol
· Retains all 8051 Peripherals Including Serial I/O and Two Timers
· Utilizes ARCNET Token Bus Network Engine
· Requires No Special Emulators
· 5 Mbps to 156 Kbps Network Data Rate
· Network Interface Supports RS-485, Twisted Pair, Coaxial, and Fiber Optic Interfaces
· Receive All Mode Allows Any Packet to Be ReceivedPinout
SpecificationsOperating Temperature Range....................................................................................... 0oC to +70oC
Storage Temperature Range .................................................................................... -55oC to +150oC
Lead Temperature (soldering, 10 seconds)............................................................................. +325 oC
Positive Voltage on any pin, with respect to ground ............................................................ VCC+0.5V
Negative Voltage on any pin, with respect to ground .................................................................. -0.5V
Maximum VCC ................................................................................................................................. +7V
*Stresses above those listed may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other condition above those indicated in the operational sections of this specification is not implied.
NOTE: When powering this device from laboratory or system power supplies, it is important that the Absolute Maximum Ratings not be exceeded or device failure can result. Some power supplies exhibit voltage spikes or "glitches" on their outputs when the AC power is switched on or off. In addition, voltage transients on the AC power line may appear on the DC output. If this possibility exists it is suggested that a clamp circuit be used.
DescriptionThe COM20051 is a low-cost, highly-integrated microcontroller incorporating a high-performance network controller based on the ARCNET Token Bus Standard (ANSI 878.1). The COM20051 is based around the popular Intel 8051 architecture. The device is implemented using a microcontroller core compatible with the Intel 80C32 ROMless version of the 8051 architecture.
The COM20051 is ideal for distributed control networking applications such as those found in industrial/machine controls, building/factory automation, consumer products, instrumentation and automobiles. The COM20051 contains many features that are beneficial for embedded control applications. The microcontroller is a fully-functional 16MHz 80C32 that is comparable to the Intel 80C32 with 2 timers.
In contrast to other embedded controller/networking solutions, the COM20051 adds a fully-featured, robust, powerful, and simple network interface while retaining all of the basic 8051 peripherals, such as the serial port and counter/timers. In addition, the COM20051 supports an Emulation Mode that permits the use of a standard 80C32 emulator in conjunction with the COM20051 to develop software drivers for the network core. ARCNET core is mapped to a 256-byte page of the External Data Memory Space of the 80C32. This
COM20051 Data Sheet
