General description

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. The UJA113xA is available in number of variants as detailed in Section 3.

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 messages to remain in partial networking Sleep/Standby mode during CAN FD

communication without generating bus errors.

A number of configuration settings are stored in non-volatile memory. This makes it possible to adapt the poweron and limp home behavior of the UJA113xA to meet the specific requirements of an application.

General

• Generic SBC functions:

– Fully integrated buck-boost converter

– 5 V/3.3 V voltage regulator delivering up to 500 mA

– Separate voltage regulator with optional protection against shorts to battery and loss of module ground

– CAN transceiver and up to two LIN transceivers

– Two-channel battery monitoring with integrated A/D converter

– Watchdog with Window and Timeout modes and on-chip oscillator

– Serial Peripheral Interface (SPI) for communicating with the microcontroller

– ECU power management system

– Protected general-purpose high-voltage I/O pins configurable as high-side drivers (HS), low-side drivers

(LS) or wake-up inputs

– Four internal PWM/pulse timers in derivatives containing high-voltage I/O pins

(see Table 1)

• Qualified for use in road vehicles with a nominal 12 V system:

– Excellent ElectroMagnetic Compatibility (EMC) performance

– ±6 kV ElectroStatic Discharge (ESD) protection according to the Human Body Model (HBM) on the CAN/LIN

bus pins

– ±6 kV ESD protection according to IEC 61000-4-2 on the CAN/LIN bus pins, the sensor supply output

(VEXT) and the HVIO pins

– ±40 V short-circuit proof CAN/LIN bus pins

– Battery and CAN/LIN bus pins are protected against transients in accordance with ISO 7637-3

– Very low-current Standby and Sleep modes with full wake-up capability

• Supports remote flash programming via the CAN-bus

• Compact 10 mm × 10 mm HTQFP48 package with low thermal resistance

• Dark green product (halogen free and Restriction of Hazardous Substances (RoHS) compliant)

• Hardware and software compatible with the UJA113x product family