Fail-safe System Basis Chips
The UJA106x family is designed to offer standardized, fail-safe System Basis Chips (SBCs) for any kind of automotive body multiplexing application that uses CAN and/or LIN communication.
The UJA106x family members combine one or more transceivers, voltage regulators and system functionality that is explained in this document. The following table gives an overview of the UJA106x family members and the included physical layers.
All devices are pin and function compatible and only differ in which physical layers are integrated.
All SBC’s of this family are as identical as possible in order to allow an easy migration from one SBC to another in one and the same application. Thus, the family approach ensures that even a late change from one Physical Layer to another can easily be performed.
The SBC family is already prepared to operate within 42V environments but also allows operation in conventional 14V and 28V environments without carrying overhead for the included 42V feature.
Within this report, application information is offered supporting ECU developers with respect to hardware and software design issues. Following figure roughly shows, how the UJA106x is embedded in a typical ECU.
Integration of the UJA106x into an application is quite easy even though the high level of details in the data sheet might give a different impression. There are several control bits, dealing with general configuration, that only need to be configured to the used application hardware once. After initial configuration of the hardware only a few bits are used during operation of the system.
The main complexity of the UJA106x deals with fail-safe mechanisms, which the user does not need to take care of. This is the reason for many of the state transitions and conditions in the state diagram of the SBC. This document shows that from the user point of view the SBC is quite simple.
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