UJA1135A
Overview
The UJA113xA System Basis Chip (SBC) contains a fully integrated buck and boost converter along with a number of features commonly found in the latest generation of automotive Electronic Control Units (ECUs). It interfaces directly with CAN and LIN bus lines, supplies the microcontroller, handles input and output signals and supports fail-safe features including a watchdog and advanced ‘limp home’ functionality configurable via non-volatile memory.
- To satisfy the demand for SBCs that operate at low battery supply voltages and feature low power dissipation, a switched mode power supply (SMPS) with automatic down (Buck mode) or up conversion (Boost mode) has been integrated into the UJA113xA. In Boost mode, the SMPS of the UJA1131A and UJA1132A variants can continue supplying a microcontroller during dips in the battery voltage, ensuring uninterrupted operation. The boost stage of the UJA1135A and the UJA1136A has limited output current capability, and is suitable for supplying the memory in a microcontroller to prevent information being lost. The SMPS requires only a single external coil and some capacitors but no separate semiconductors. The UJA113xA implements the standard CAN physical layer as defined in ISO 11898-2:2016. This implementation enables reliable communication in the CAN FD fast phase at data rates up to 5 Mbit/s. The UJA113xAHW/xFx variants support ISO 11898-2:2016 compliant CAN partial networking with a selective wake-up function incorporating CAN FD-passive. CAN FD-passive is a feature that allows CAN FD bus traffic to be ignored in Sleep/Standby mode. CAN FD-passive partial networking is the perfect fit for networks that support both CAN FD and classic CAN communications. It allows normal CAN controllers that do not need to communicate CAN FD
