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Mini High-Speed CAN System Basis Chip for Partial Networking
- This page contains information on a product that is not recommended for new designs.
This part is not recommended for new designs. For new designs, we recommend UJA1168ATK.
The UJA1168 is a mini high-speed CAN System Basis Chip (SBC) containing an ISO 11898-2/5/6 compliant HS-CAN transceiver and an integrated 5 V/100 mA supply for a microcontroller. It also features a watchdog and a Serial Peripheral Interface (SPI). The UJA1168 can be operated in very low-current Standby and Sleep modes with bus and local wake-up capability and supports ISO 11898-6 compliant CAN partial networking by means of a selective wake-up function. The microcontroller supply is switched off in Sleep mode. The UJA1168TK and UJA1168TK/FD versions contain a battery-related high-voltage output (INH) for controlling an external voltage regulator, while the UJA1168TK/VX and UJA1168TK/VX/FD are equipped with a 5 V sensor supply (VEXT).
A dedicated implementation of the partial networking protocol has been embedded into the UJA1168/FD variants, UJA1168TK/FD and UJA1168TK/VX/FD. This function is called ‘FD-passive’ and is the ability to ignore CAN FD frames while waiting for a valid wake-up frame in Sleep/Standby mode. This additional feature of partial networking is a good fit for networks that support both CAN FD and standard CAN 2.0 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.
The UJA1168 implements the standard CAN physical layer as defined in the current ISO11898 standard (-2, -5 and -6). Pending the release of the updated version of ISO11898 including CAN FD, additional timing parameters defining loop delay symmetry are included. This implementation enables reliable communication in the CAN FD fast phase at data rates up to 2 Mbit/s.
A number of configuration settings are stored in non-volatile memory, allowing the SBC to be adapted for use in a specific application. This makes it possible to configure the power-on behavior of the UJA1168 to meet the requirements of different applications.
HVSON14 Package
Product Details
Features
General
- ISO 11898-2, ISO 11898-5 and ISO 11898-6 compliant high-speed CAN transceiver
- Loop delay symmetry timing enables reliable communication at data rates up to 2 Mbit/s in the CAN FD fast phase
- Autonomous bus biasing according to ISO 11898-6
- Fully integrated 5 V/100 mA low-drop voltage regulator for 5 V microcontroller supply (V1)
- Bus connections are truly floating when power to pin BAT is off
- No ‘false’ wake-ups due to CAN FD frame detection in UJA1168TK/FD and UJA1168TK/VX/FD
Designed for Automotive Applications
- ±8 kV ElectroStatic Discharge (ESD) protection, according to the Human Body Model (HBM) on the CAN bus pins
- ±6 kV ESD protection, according to IEC 61000-4-2 on the CAN bus pins, the sensor supply output VEXT and on pins BAT and WAKE
- CAN bus pins short-circuit proof to ±58 V
- Battery and CAN bus pins protected against automotive transients according to ISO 7637-3
- Very low quiescent current in Standby and Sleep modes with full wake-up capability
- Leadless HVSON14 package (3.0 mm x 4.5 mm) with improved Automated Optical Inspection (AOI) capability and low thermal resistance
- Dark green product (halogen free and Restriction of Hazardous Substances (RoHS) compliant)
Low-Drop Voltage Regulator for 5 V Microcontroller Supply (V1)
- 5 V nominal output; ±2 % accuracy
- 100 mA output current capability
- Current limiting above 150 mA
- On-resistance of 5 Ω (max)
- Support for microcontroller RAM retention down to a battery voltage of 2 V
- Undervoltage reset with selectable detection thresholds: 60 %, 70 %, 80 % or 90 % of output voltage
- Excellent transient response with a 4.7 μF ceramic output capacitor
- Short-circuit to GND/overload protection on pin V1
- Turned off in Sleep mode
Power Management
- Standby mode featuring very low supply current; voltage V1 remains active to maintain the supply to the microcontroller
- Sleep mode featuring very low supply current with voltage V1 switched off
- Remote wake-up capability via standard CAN wake-up pattern or via ISO 11898-6 compliant selective wake-up frame detection
- Local wake-up via the WAKE pin
- Wake-up source recognition
- Local and/or remote wake-up can be disabled to reduce current consumption
- High-voltage output (INH) for controlling an external voltage (UJA1168TK and UJA1168TK/FD)
System Control and Diagnostic Features
- Mode control via the Serial Peripheral Interface (SPI)
- Overtemperature warning and shutdown
- Watchdog with independent clock source
- Watchdog can be operated in Window, Timeout and Autonomous modes
- Optional cyclic wake-up in watchdog Timeout mode
- Watchdog automatically re-enabled when wake-up event captured
- Watchdog period selectable between 8 ms and 4 s
- Supports remote flash programming via the CAN bus
- 16-, 24- and 32-bit SPI for configuration, control and diagnosis
- Bidirectional reset pin with variable power-on reset length to support a variety of microcontrollers
- Configuration of selected functions via non-volatile memory
Sensor Supply Voltage (pin VEXT of UJA1168TK/VX and UJA1168TK/VX/FD)
- 5 V nominal output; ±2 % accuracy
- 30 mA output current capability
- Current limiting above 30 mA
- Excellent transient response with a 4.7 μF ceramic output load capacitor
- Protected against short-circuits to GND and to the battery
- High ESD robustness of ±6 kV according to IEC 61000-4-2
- Can handle negative voltages as low as -18 V
Part numbers include: UJA1168TK.
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