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Application Scenario:
The SJA1000T/N,112 is used in an automotive setting to enable communication between various electronic control units (ECUs) in a car, such as the engine control unit (ECU), transmission control unit (TCU), and others. This allows for real-time data exchange and coordination of various functions in the vehicle.
Circuit Connection:
Here's a detailed connection for one SJA1000T/N,112 in this automotive application:
1. Power Supply:
- Pin 6 (VDD): Connect to +5V power supply.
- Pin 5 (VSS): Connect to the ground (0V).
2. CAN Bus Connection:
- Pin 9 (CANH): Connect to the high side of the CAN bus.
- Pin 10 (CANL): Connect to the low side of the CAN bus.
3. Crystal Oscillator:
- Pins 18 (XTAL1) and 19 (XTAL2): Connect a 16 MHz crystal oscillator across these pins to provide the clock source.
4. Reset and Control Signals:
- Pin 4 (RESET): Connect to a reset circuit for initializing the chip.
- Pin 12 (INT): Connect to an interrupt controller to signal when a message is received or transmitted.
5. SPI Interface:
- Pins 14 (SCK), 15 (SI), and 16 (SO): Connect these pins to a microcontroller or host processor for configuring and controlling the SJA1000T/N,112 via SPI communication.
6. Mode Control:
- Pin 1 (STB): Connect to a logic level signal (High for Normal Mode, Low for Standby Mode).
- Pin 3 (INH): Connect to a logic level signal (Low for Normal Mode, High for Standby Mode).
7. Can Termination:
- For the last node on the CAN bus, connect a 120-ohm termination resistor between Pin 9 (CANH) and Pin 10 (CANL).
Considerations in Circuit Design:
When designing a circuit using the SJA1000T/N,112, several important considerations need to be taken into account:
1. Power Supply and Grounding: Ensure stable power supply and proper grounding to avoid noise and interference issues.
2. CAN Bus Termination: Proper termination is crucial for signal integrity. Terminate the CAN bus at both ends with 120-ohm resistors to minimize reflections.
3. Crystal Oscillator: Use a high-quality 16 MHz crystal oscillator to ensure accurate timing for CAN communication.
4. Microcontroller Interface: Design the microcontroller interface circuitry for SPI communication to configure and control the SJA1000T/N,112 effectively.
5. Interrupt Handling: Implement interrupt handling in your microcontroller firmware to respond to events generated by the SJA1000T/N,112, such as message reception or transmission completion.
6. Mode Control: Carefully control the STB and INH pins to switch between Normal and Standby modes as needed for power management.
7. Multiple SJA1000T/N,112 Chips: If multiple SJA1000T/N,112 chips are used in the same system, ensure proper addressing and bus management to prevent conflicts.
By addressing these considerations and following the detailed circuit connection, you can create a robust and reliable CAN communication system using the SJA1000T/N,112 in an automotive application.
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(1)Such as a deficiency in quantity, delivery of wrong items, and apparent external defects (breakage and rust, etc.), and we acknowledge such problems.
(2)We are informed of the defect described above within 90 days after the delivery of SJA1000T/N,112.
(3)The PartNo is unused and only in the original unpacked packaging.
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(1)Inform us within 90 days
(2)Obtain Requesting Return Authorizations
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