UJA1078A
High-speed CAN/dual LIN core system basis chip
Rev. 2 — 28 January 2011
Product data sheet
1. General description
The UJA1078A core System Basis Chip (SBC) replaces the basic discrete components
commonly found in Electronic Control Units (ECU) with a high-speed Controller Area
Network (CAN) and two Local Interconnect Network (LIN) interfaces.
The UJA1078A supports the networking applications used to control power and sensor
peripherals by using a high-speed CAN as the main network interface and the LIN
interfaces as local sub-busses.
The core SBC contains the following integrated devices:
•
High-speed CAN transceiver, inter-operable and downward compatible with CAN
transceiver TJA1042, and compatible with the ISO 11898-2 and ISO 11898-5
standards
•
LIN transceivers compliant with LIN 2.1, LIN 2.0 and SAE J2602, and compatible with
LIN 1.3
•
Advanced independent watchdog (UJA1078A/xx/WD versions)
•
250 mA voltage regulator for supplying a microcontroller; extendable with external
PNP transistor for increased current capability and dissipation distribution
•
•
•
•
Separate voltage regulator for supplying the on-board CAN transceiver
Serial Peripheral Interface (SPI) (full duplex)
2 local wake-up input ports
Limp home output port
In addition to the advantages gained from integrating these common ECU functions in a
single package, the core SBC offers an intelligent combination of system-specific
functions such as:
•
Advanced low-power concept
•
Safe and controlled system start-up behavior
•
Detailed status reporting on system and sub-system levels
The UJA1078A is designed to be used in combination with a microcontroller that
incorporates a CAN controller. The SBC ensures that the microcontroller always starts up
in a controlled manner.
NXP Semiconductors
UJA1078A
High-speed CAN/dual LIN core system basis chip
2. Features and benefits
2.1 General
Contains a full set of CAN and LIN ECU functions:
CAN transceiver and two LIN transceivers
Scalable 3.3 V or 5 V voltage regulator delivering up to 250 mA for a
microcontroller and peripheral circuitry; an external PNP transistor can be
connected for better heat distribution over the PCB
Separate voltage regulator for the CAN transceiver (5 V)
Watchdog with Window and Timeout modes and on-chip oscillator
Serial Peripheral Interface (SPI) for communicating with the microcontroller
ECU power management system
Designed for automotive applications:
Enhanced ElectroMagnetic Compatibility (EMC) performance
±8
kV ElectroStatic Discharge (ESD) protection Human Body Model (HBM) on the
CAN/LIN bus pins and the wake-up pins
±6
kV ElectroStatic Discharge protection IEC 61000-4-2 on the CAN/LIN bus pins
and the wake-up pins
±58
V short-circuit proof CAN/LIN bus pins
Battery and CAN/LIN bus pins are protected against transients in accordance with
ISO 7637-3
Supports remote flash programming via the CAN bus
Small 6.1 mm
×
11 mm HTSSOP32 package with low thermal resistance
Pb-free; Restriction of Hazardous Substances Directive (RoHS) and dark green
compliant
2.2 CAN transceiver
ISO 11898-2 and ISO 11898-5 compliant high-speed CAN transceiver
Dedicated low dropout voltage regulator for the CAN bus:
Independent of the microcontroller supply
Significantly improves EMC performance
Bus connections are truly floating when power is off
SPLIT output pin for stabilizing the recessive bus level
2.3 LIN transceivers
2
×
LIN 2.1 compliant LIN transceivers
Compliant with SAE J2602
Downward compatible with LIN 2.0 and LIN 1.3
Low slope mode for optimized EMC performance
Integrated LIN termination diode at pin DLIN
2.4 Power management
Wake-up via CAN, LIN or local wake-up pins with wake-up source detection
2 wake-up pins:
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
2 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 V
BAT
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 V
BAT
voltages down to 5.5 V (e.g. during cranking) in accordance
with ISO 7637, pulse 4
Stable output under all conditions
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
3. Ordering information
Table 1.
Ordering information
Package
Name
UJA1078ATW/5V0/WD
UJA1078ATW/3V3/WD
UJA1078ATW/5V0
UJA1078ATW/3V3
[1]
UJA1078ATW/5V0xx versions contain a 5 V regulator (V1); UJA1078ATW/3V3xx versions contain a 3.3 V regulator (V1); WD versions
contain a watchdog.
Type number
[1]
Description
plastic thermal enhanced thin shrink small outline package;
32 leads; body width 6.1 mm; lead pitch 0.65 mm; exposed die
pad
Version
SOT549-1
HTSSOP32
4. Block diagram
UJA1078A
BAT
V1
V2
GND
V1
UV
V2
UV
EXT. PNP
CTRL
VEXCTRL
VEXCC
WBIAS
V1
V2
SCK
SDI
SDO
SCSN
WAKE1
WAKE2
WDOFF
EN
DLIN
LIN1
TXDL1
RXDL1
HS-CAN
LIN2
TXDL2
RXDL2
BAT
LIN2
LIN1
BAT
WAKE
SYSTEM
CONTROLLER
INTN
RSTN
OSC
TEMP
LIMP
V2
CANH
CANL
TXDC
RXDC
SPLIT
015aaa184
Fig 1.
Block diagram
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
4 of 54
NXP Semiconductors
UJA1078A
High-speed CAN/dual LIN core system basis chip
5. Pinning information
5.1 Pinning
TXDL2
RXDL2
TXDL1
V1
RXDL1
RSTN
INTN
EN
SDI
1
2
3
4
5
6
7
8
9
32 BAT
31 VEXCTRL
30 TEST2
29 VEXCC
28 WBIAS
27 LIN2
26 DLIN
25 LIN1
24 SPLIT
23 GND
22 CANL
21 CANH
20 V2
19 WAKE2
18 WAKE1
17 LIMP
015aaa185
UJA1078A
SDO 10
SCK 11
SCSN 12
TXDC 13
RXDC 14
TEST1 15
WDOFF
16
Fig 2.
Pin configuration
5.2 Pin description
Table 2.
Symbol
TXDL2
RXDL2
TXDL1
V1
RXDL1
RSTN
INTN
EN
SDI
SDO
SCK
SCSN
TXDC
RXDC
TEST1
WDOFF
LIMP
UJA1078A
Pin description
Pin
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
Description
LIN2 transmit data input
LIN2 receive data output
LIN1 transmit data input
voltage regulator output for the microcontroller (5 V or 3.3 V depending on
SBC version)
LIN1 receive data output
reset input/output to and from the microcontroller
interrupt output to the microcontroller
enable output
SPI data input
SPI data output
SPI clock input
SPI chip select input
CAN transmit data input
CAN receive data output
test pin; pin should be connected to ground
WDOFF pin for deactivating the watchdog
limp home output
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
5 of 54
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