2.3.4 Typical 5V Application Circuit with One-Wire-Control

The preceding figure shows a typical 12V one-wire bus application circuit running from a 5V voltage regulator contained within the LIN transceiver ATA6625 device. In this application, directly connect the pin PB4 (PWRON) to VS; the ATA8510/15 enters the IDLEMode after power-up of the ATA6625 and stays there after the software in the Flash asserts the EN pin on the ATA6625 to HIGH. The system can be completely switched ON or OFF with a command via the one-wire bus. Use this application only when there is a need to separate the external host μC over a certain distance from the ATA8510/15. In these scenarios, the ATA8510/15 can work autonomously and communicate to the external host μC via a one-wire bus.

Together with 24-Kbyte ROM firmware, use the application software within the Flash for controlling the ATA8510/15 and the ATA6625. Use a simplified LIN-compliant physical layer for one-wire communication because the ATA8510/15 does not natively support one-wire commands. However, implement the one-wire communication through the use of application Flash software (ATA8510). The ATA8515 is not suitable for this application.

The ports PC0..PC2 have internal 50-kΩ pull-up resistors and can be left open. However, connect the ports PB1, PB2 and PB5 to ground. The ANT_TUNE pin must be left open because the application example uses a non-loop antenna. For more details regarding the use of a 2.4-5.5V supply and its distribution within the ATA8510/15, refer to Typical 5V Application Circuit with External Microcontroller.