AS82527

Overview

The AS82527 is a serial communications controller manufactured by Rochester Electronics, LLC, designed to perform serial communication functions according to the Controller Area Network (CAN) protocol. This highly integrated device handles message transmission and reception, filtering, transmit search, and interrupt search with minimal host microcontroller interaction. It supports CAN Specification 2.0 for standard and extended data and remote frames. The component features 15 message objects with an 8-byte data length, including 14 Tx/Rx buffers and one Rx buffer with a programmable mask. It offers flexible CPU interfaces such as 8-bit or 16-bit multiplexed modes and a serial interface. The device is available in 44-lead PLCC and QFP packages.

Feature Summary

• Performs complete CAN protocol serial communication tasks including message handling and filtering autonomously.
• Supports CAN Specification 2.0 with programmable global masks for standard and extended identifiers.
• Provides flexible CPU interface options including multiplexed and non-multiplexed configurations.
• Integrates two 8-bit bidirectional I/O ports and configurable output drivers.

Applications

• Automotive electronic control units requiring CAN bus connectivity
• Industrial automation systems utilizing Controller Area Network protocols
• Embedded systems needing autonomous serial message processing

Procurement Notes

Verify the specific package variant, either 44-lead PLCC or QFP, against the design requirements. Confirm that the manufacturer is Rochester Electronics, LLC, as they often distribute components originally designed by other entities like Intel. Ensure the CAN specification version 2.0 support aligns with the network architecture. Check for any pinout compatibility notes if replacing legacy parts like the 82526.

Selection Notes

Select this component when a dedicated hardware solution for CAN protocol handling is required to reduce host CPU load. Consider the available CPU interface modes, such as 8-bit or 16-bit multiplexed, to match the system bus architecture. Evaluate the need for the 15 message objects and their buffering capabilities against the application's throughput requirements. Verify package availability in PLCC or QFP formats suitable for the target PCB layout.

Part Context

The AS82527 serves as a specialized serial communications controller within the CAN protocol ecosystem. Originally associated with Intel Corporation designs, it is now distributed by Rochester Electronics. It provides a robust alternative for systems requiring reliable, low-host-interaction CAN communication, supporting both standard and extended frame formats defined in CAN Specification 2.0.

Replacement Considerations

The datasheet indicates pinout compatibility with the 82526. Verify electrical parameters and interface timing characteristics before substituting other CAN controllers. Ensure the replacement supports the same CAN Specification 2.0 standards and message object configurations.