UJA1076 datasheet(3/47 Pages) NXP

3 / 47 page

UJA1076_2

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Product data sheet

Rev. 02 — 27 May 2010

3 of 47

NXP Semiconductors

UJA1076

High-speed CAN core system basis chip

2.4 Control and Diagnostic features

Safe and predictable behavior under all conditions

Programmable watchdog with independent clock source:

Window, Timeout (with optional cyclic wake-up) and Off modes supported (with

automatic re-enable in the event of an interrupt)

16-bit Serial Peripheral Interface (SPI) for configuration, control and diagnosis

Global enable output for controlling safety-critical hardware

Limp home output (LIMP) for activating application-specific ‘limp home’ hardware in

the event of a serious system malfunction

Overtemperature shutdown

Interrupt output pin; interrupts can be individually configured to signal V1/V2

undervoltage, CAN/local wake-up and cyclic and power-on interrupt events

Bidirectional reset pin with variable power-on reset length to support a variety of

microcontrollers

Software-initiated system reset

2.5 Voltage regulators

Main voltage regulator V1:

Scalable voltage regulator for the microcontroller, its peripherals and additional

external transceivers

±2 % accuracy

3.3 V and 5 V versions available

Delivers up to 250 mA and can be combined with an external PNP transistor for

better heat distribution over the PCB

Selectable current threshold at which the external PNP transistor starts to deliver

current

Undervoltage warning at 90 % of nominal output voltage and undervoltage reset at

90 % or 70 % of nominal output voltage

Can operate at VBAT voltages down to 4.5 V (e.g. during cranking), in accordance

with ISO7637 pulse 4/4b and ISO16750-2

Stable output under all conditions

Voltage regulator V2 for CAN transceiver:

Dedicated voltage regulator for on-chip high-speed CAN transceiver

Undervoltage warning at 90 % of nominal output voltage

Can be switched off; CAN transceiver can be supplied by V1 or by an external

voltage regulator

Can operate at VBAT voltages down to 5.5 V (e.g. during cranking) in accordance

with ISO7637, pulse 4

Stable output under all conditions

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