IC compliant with ISO 11992-1

ON Semiconductor is going to produce CAN transceiver chips for truck/trailer communication. The NCV7390 is pin-compatible with legacy proprietary ICs (integrated circuits) by Wabco (now ZF).

Currently, ON Semiconductor tests the NVC7390 transceiver on interoperability with legacy CAN transceivers developed by Wabco, one of the market-leading manufacturers of ECUs implementing CAN interfaces compliant with the ISO 11992 series. This standard specifies a CAN-based link between towing and towed road vehicles. It is mandated in Europe for all heavy-duty commercial vehicles. The Wabco chip was produced by ON Semiconductor, but it was not available on the open market. For the NVC7390, the chipmaker uses a new technology with improved capabilities. Test samples are available for dedicated customers.

The NCV7390 transceiver provides a CAN-based point-to-point connection for serial data interchange between towing and towed vehicle or other similar automotive applications. It is the interface between a CAN protocol controller and the cable. The IC supplies a differential voltage, but allows switching in error conditions to a single−wire transmission. It complies with ISO 11992-1 and supports 12-V as well as 24-V power supplies. The AEC−Q100 qualified chip features a sleep mode with low-current consumption and a CAN wake-up function.

There are two logical states for the two CAN lines: dominant or recessive. The bus is in the recessive state, when the driving sections of both transceivers connected to the bus are passive. The recessive state is specified by a voltage level of typical one-third battery voltage at CAN-H and typical two-third battery voltage at CAN-L. If one transceiver became active, the bus changes into the dominant state. The dominant state is specified by a voltage level of typical two-third of battery voltage at CAN-H and one third at CAN-L.

The transceiver includes a bus driving section with biasing and driver outputs for CAN-H and CAN-L. The biasing outputs for the recessive state are active, if the corresponding enable input is set to a low state. To change to the dominant state, it is only necessary to activate the driver output by a low level at the TxD input. The biasing and driver outputs are implemented as open drain push and pull driver. The bus receiving section consists of an integrated RF (radio frequency) filter followed by three comparators. Comparators sense the state of the bus lines. The reception of a dominant state causes a low-level at RxD pin.

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