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  • Mini high-speed CAN system basis for MCU

  • Created: Sep 08, 2014

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Summary

A system base chip (SBC) refers to an IC in which a plurality of functions is necessary for electronic module combination. These functional groups can be voltage regulator, voltage monitoring, reset generator, watchdog, bus interface, wakeup logic, and power driver. The power bandwidth of this IC is very different: It is a relatively complex device that can be easily configured, which has a hard-wired functionality.


The circuit uses a UJA1167 mini high-speed CAN System Basis Chip (SBC) containing an ISO 11898-2/5 compliant HS-CAN transceiver and an integrated 5V/100mA supply for a microcontroller. It also features a watchdog and a Serial Peripheral Interface (SPI). The UJA1167 can be operated in very low-current standby and sleep modes with bus and local wake-up capability and support. The microcontroller supply is switched OFF in sleep mode. The UJA1167TK version contains a battery-related high-voltage output for controlling an external voltage regulator, while the UJA1167TK/VX is equipped with a 5V sensor supply. The UJA1167 implements the standard CAN physical layer as defined in the current ISO-11898 standard.


Pending the release of the updated version of ISO-11898 including CAN FD, additional timing parameters defining loop delay symmetry are included. This implementation enables reliable communication in the CAN FD fast phase at data rates up to 2 Mbit/s. A number of configuration settings are stored in a non-volatile memory, allowing the SBC to be adapted for use in a specific application. This makes it possible to configure the power-on behavior of the UJA1167 to meet the requirements of different applications such as in modern automobile.

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