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UJA1078ATW Datasheet(PDF) 3 Page - NXP Semiconductors |
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UJA1078ATW Datasheet(HTML) 3 Page - NXP Semiconductors |
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3 / 54 page  UJA1078A All information provided in this document is subject to legal disclaimers. © NXP B.V. 2011. All rights reserved. Product data sheet Rev. 2 — 28 January 2011 3 of 54 NXP Semiconductors UJA1078A High-speed CAN/dual LIN core system basis chip WAKE1 and WAKE2 inputs can be switched off to reduce current flow Output signal (WBIAS) to bias the wake-up pins, selectable sampling time of 16 ms or 64 ms Standby mode with very low standby current and full wake-up capability; V1 active to maintain supply to the microcontroller Sleep mode with very low sleep current and full wake-up capability 2.5 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/LIN/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 2.6 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 ISO 7637 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 ISO 7637, pulse 4 Stable output under all conditions |
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