Microcomputer Components

Standalone Full-CAN Controller

SAE 81C90/91

● Full CAN controller for data rate up to 1 Mbaud

● Complies with CAN specification V2.0 part A (part B passive)

● Up to 16 messages simultaneous (each with maximum data length)

● Message identifier reprogrammable “on the fly”

● Several transmit jobs can be sent with a single command

● Transmit check

● Basic CAN feature

● Time stamp for eight messages

● Two host interfaces (parallel and serial)

● User-configurable outputs for different bus concepts

● Programmable clock output

● Two 8 bit I/O-Port extension (P-LCC-44-1 package only)

The device comes in two versions:

SAE 81C90 in a P-LCC-44-1 package with two 8-bit l/O ports, and

SAE 81C91 in a P-LCC-28-1 package without l/O ports.

Introduction

The Siemens Stand Alone Full CAN (SFCAN) circuit incorporates all the parts for completely autonomous transmission and reception of messages using the CAN protocol. The flexible, programmable interface allows hookup to different implementations of the physical layer. The link to a host controller can be made either by a multiplexed 8-bit address/data bus or by a high-speed, serial synchronous interface.

Figure 1 Logic Symbol

Absolute Maximum Ratings

Ambient temperature under bias (T_A): ..................................................................... – 40 to + 110 ˚C

Storage temperature (T_STG)........................................................................................ – 50 to + 150 ˚C

Voltage on V_CC pins with respect to ground (V_SS) ..................................................... – 0.5 to + 6.0 V

Voltage on any pin with respect to ground (V_SS).................................................– 0.5 to VCC + 0.5 V

Input current on any pin during overload condition.................................................. – 10 to + 10 mA

Absolute sum of all input currents during overload condition ............................................. |100 mA|

Power dissipation..................................................................................................................... 0.5 W

Note: Stresses above those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. During overload conditions (V_IN > V_CC or V_IN < V_SS) the voltage on pins with respect to ground (V_SS) must not exceed the values defined by the Absolute Maximum Ratings.

Pin Configurations (top view)