“The leading semiconductor component distributor dedicated to the Asia-Pacific market, General Assembly Holdings, announced that its subsidiary Pinjia has launched CAN/LIN communication based on Microchip PIC16F1779, Onsemi NCV78343 and OSRAM LEDs Matrix headlight solution.
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On September 15, 2021, the leading semiconductor component distributor dedicated to the Asia-Pacific region-General Assembly Holdings announced that its subsidiary Pinjia has launched PIC16F1779, Onsemi NCV78343 and OSRAM based on Microchip Technology (Microchip) PIC16F1779 ) LED CAN/LIN communication matrix headlight solution.
Figure 1-The physical diagram of the CAN/LIN communication matrix headlight solution launched by Dalian Dapinjia and a number of well-known companies
As people’s requirements for automobiles continue to increase, more and more Electronic control devices are applied to automobiles. While these electronic control devices improve the comfort of the car, they have also led to the increasing complexity of the car wiring harness. For this reason, Dalian Dapinjia has launched a CAN/LIN communication matrix headlight solution based on Microchip, Onsemi and OSRAM products, aiming to replace the cumbersome field connection with a serial communication network to solve the above problems.
Figure 2-Block diagram of the CAN/LIN communication matrix headlight solution launched by Dalian Dapinjia and a number of well-known companies
The core part of this solution uses Microchip’s PIC16F1779 MCU, which integrates peripheral modules independent of the core to achieve switching power supply control, logic control and communication functions. Compared to pure analog or ASIC implementation solutions, flexibility can be significantly improved. And PIC16F1779 can independently control up to four LED channels, which is a unique ability that most LED drive controllers do not have, and is especially suitable for the design of combined headlights/taillights. In addition, this solution also integrates onsemi’s NCV78343 matrix control chip and OSRAM’s excellent LED products, which will further improve the performance of CAN/LIN communication matrix headlights.
Figure 3-The application diagram of the CAN/LIN communication matrix headlight solution launched by Dalian Dapinjia and a number of well-known companies
As an excellent communication matrix headlight solution, it integrates a four-channel LED dimming engine on a single MCU, which can realize up to four completely independent LED string constant current drives, and adopts a SEPIC buck-boost topology. , The application range is wider. For different LED loads, you only need to adjust the output voltage and current on the software.
The LED dimming engine is composed of analog peripherals integrated in the microcontroller. These modules are connected through the MCC configuration to form four independent LED dimming drivers. After the configuration is completed, the system can control the switch mode power converter by itself almost without the intervention of the central processing unit (CPU), which can free up the CPU to perform other important tasks, such as monitoring functions, communication functions or new intelligence in the system Features.
Core technical advantages:
• PIC16F1779 single hybrid power MCU (built-in PRG slope compensation, OPA operational amplifier, COMP comparator, COG complementary waveform generator, DAC, ADC, USART and other peripherals), which can realize four-channel SEPIC buck-boost constant current drive, CAN /LIN protocol processing, matrix chip animation control;
• Use PCMC peak current mode to quickly respond to load changes, SEPIC topology to achieve buck-boost, single-channel constant current up to 1A (pay attention to LED heat dissipation), support PWM dimming;
• Hardware-level overvoltage protection, which automatically turns off the PWM output when overvoltage;
• Detect the terminal voltage of the LED light string, can judge the LED open circuit, short circuit and other faults, and feedback to the BCM simulator through CAN communication to Display on the indicator;
• NTC thermistor detects the temperature of the LED to achieve overheating protection and over-temperature derating operation;
• Adopt photoresistor to detect the intensity of ambient light to realize automatic headlight function;
• Simulate BCM sending CAN commands to control headlights on and off, dimming, switch animation, matrix control, reset, voltage/status/fault feedback;
• Four-way drive realizes combined headlight functions, including high beam, low beam, daytime running lights, position lights, and turn signals. (Daytime running lights and position lights share the third group of drivers, adjust the brightness through software);
• NCV78343 UART Over CAN communication, which can support long-distance transmission. Automatic addressing at power-on, 4 cascade connection to realize independent control of 48 (12*4) LEDs;
• Modular design, easy to modify and replace modules, to match different functional requirements;
• Support MPLAB X IDE MCC graphical code configuration plug-in, graphically generate the underlying driver, rapid development;
• The well-designed SAC_CAN_LED_Lib SDK development kit provides four-channel PCMC constant voltage/constant current driver, PWM dimming, MCP25625 CAN driver, USART driver, frequency jitter and other functions, and API interface;
• After signing the NDA, the schematic diagram, PCB diagram, bill of materials, software example source code, SDK development kit, and CAN communication protocol can be provided.
Scheme specifications:
• PWM frequency: 333KHz (250KHz~500KHz software adjustable);
• Conversion efficiency: 82%~85%;
• Over-temperature protection: Derating to 80% when the temperature is above 112.5℃, and derating to 70% when the temperature is above 122.5℃. (Software adjustable);
• LED fault detection: support;
• LIN communication: support (use MCC to generate code);
• CAN communication: support (drive API provided in the SDK), support for control, status, and fault feedback;
• Switch control: support;
• Digital jitter: support (software adjustable);
• Soft start: support (software adjustable);
• Input anti-reverse connection: support;
• Current resolution: 6.66666667mA (related to the value of the LED current sampling resistor, with large resistance and high resolution);
• Maximum power: 40W x 4 channels;
• Input voltage: DC 9V~24V;
• Matrix control: NCV78343 maximum 1.5A*12 LEDs*4 channels;
• Animation effects: boot animation, shutdown animation.
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