Automotive smart taillight application case based on Chipsea Technology CS32F116Q

With the continuous development of automobile intelligence, people have begun to pursue a better driving experience and have put forward higher requirements for comprehensive automobile safety performance, including automobile taillight systems with important prompt functions.

Usually, the light group at the rear of a car is a very important part of the vehicle lighting system, consisting of brake lights, reversing lights, turn signals, and fog lights. The main function of the taillight is to alert the vehicle behind and convey the driving status of the vehicle in front.

In order to improve the display effect and stability of tail lights, the solution usually uses a combination of MCU + LED driver chip . In view of the need to comply with vehicle specifications, it is necessary to meet AEC-Q100 reliability certification to improve system stability.

Chipsea Technology CS32F116Q is a general-purpose automotive-grade MCU based on the ARM  Cortex-M3 core, which meets the requirements of AEC-Q100 certification and can be widely used in scenarios such as car light control, car motor control , car window control, and car sensor detection .

01

CS32F116Q product advantages

▌High-performance processor: ARM Cortex-M3 core, 72MHz operating frequency, supports single-cycle multiplication and hardware division.

▌Rich clock sources: It has an 8MHz internal RC high-speed oscillator and a 40kHz internal RC low-speed oscillator. It also supports external crystal oscillators from 4 to 16MHz and supports phase-locked loop (PLL) frequency multiplication.

▌Large-capacity storage: Integrated 128KBytes Flash memory and 20KBytes S RAM , providing sufficient storage space.

▌Advanced timer and PWM controller : Features 3 16-bit timers, each timer has four independent channels for input capture/output comparison/PWM generation/single pulse mode, while supporting incremental encoder input and Hall sensor input; 16-bit PWM advanced control timer with dead zone control and emergency braking.

▌High -precision ADC : Provides two 12-Bit high-precision ADCs with a sampling rate of up to 1Msps and 16 input channels.

▌Powerful communication interface : 3 USART interfaces , communication rate up to 4.5Mb/s; 2 I2C interfaces, supporting standard mode and fast mode; 2 SPI interfaces; 1 CAN  2.0B interface; 1 USB  2.0 interface. USART/I2C/SPI can realize direct transmission of data through 7-channel DMA .

▌Identity authentication and security features: Supports CRC and 96-bit UID, providing identity authentication function.

▌Rich GPIO: LQFP48: 37 pcs, LQFP64: 51 pcs, LQFP100: 80 pcs, enabling a variety of peripheral connections.

CS32F116Q system block diagram

02

CS32F116Q tail light application solution

This solution uses CS32F116Q as the main control chip, paired with two 9-channel RGB  LED driver chips and a 36-channel RGB LED driver chip, which has first-class application characteristics.

First of all, the wide voltage power supply of 9V~16V and anti-reverse connection design ensure sufficient power support while enhancing power supply security.

Secondly, all lamp beads can present a breathing light effect of alternating light and dark, creating a charming visual effect and leading a new trend in driving lighting effects. The light control can also be turned on and off in sequence to create a running water lamp effect, which is cool and creative .

Finally, this solution communicates with the BCM through the CAN/LIN interface to achieve diversified display control and meet the personalized innovation and stable and reliable application needs of different users for automotive taillight systems.

CS32F116Q tail light solution system block diagram

CS32F116Q has 2 I2C bus interfaces (I2C0, I2C1), can work in multi-master mode or slave mode, and supports standard mode and fast mode to provide diverse options. Two 9-channel RGB LED driver chips can be mounted on the I2C0 bus at the same time to complete precise data transmission through different device addresses, further controlling two groups of LEDs and controlling the light of 18 lamp beads. I2C1 communicates with the 36-channel RGB LED driver chip to control 36 LEDs to create eye-catching turn instructions.

In this solution, the 400K fast mode is used to communicate with external devices in a timely manner.

In addition, CS32F116Q has 3 efficient USART interfaces, of which the communication rate of USART 1 interface can reach 4.5Mb/s, and the communication rate of other interfaces (USART2, USART3) can reach 2.25Mb/s, which is fast and stable. The USART interface has hardware CTS and RTS signal management, supports IrDA SIR ENDEC transmission codec, is compatible with ISO7816 smart cards and provides LIN master/slave functions. All USART interfaces can use DMA operations, greatly improving efficiency.

This solution uses the LIN slave function of USART to communicate precise information with the external single-wire LIN.

CS32F116Q tail light scheme reverse side

CS32F116Q tail light scheme front view

As can be seen from the above physical diagram, this solution uses a daughter-motherboard connection method. The motherboard is an LED driver board, and the daughter board is a CS32F116Q minimum system board. The 8- PIN SWD interface is used to implement program burning.

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