ON Semiconductor Centralized and Distributed Door Control Module Solution

ON Semiconductor Centralized and Distributed Door Control Module Solution

According to IC Insights estimates, by 2030, Electronic products will account for 50% of the cost of the entire vehicle. The continuous development of automotive electronics has greatly improved the handling, safety and comfort of automobiles. However, with the increasing number of automotive electronic devices, the complexity of automotive system design is also increasing. Take the door control system as an example, window lift, door switch, rearview mirror folding, level and up and down adjustment, electric heating, turn signal, floor lamp, security light, control panel background light, button, rear view in advanced configuration Mirror electric anti-glare, etc., the functional requirements are more and more, and the design is more and more complex. In response to the increasingly complex automotive door control design, ON semiconductor, the world’s leading semiconductor manufacturer, provides a wealth of device selection and system solutions.

Electronic door control is broadly divided into two architectures: centralized control and decentralized control. The centralized control controls and drives each load in the door through the central module, which can reduce the overall cost, but increases the complexity of the controller, lacks flexibility, and the cost of product upgrades is high; the decentralized control is for each door. The internal load is controlled by the respective ECU modules independently, and can also be controlled by the driver’s side ECU through the CAN/LIN bus. It is characterized by simple structure, better interchangeability and compatibility, and easy upgrade, but the cost is high. ON Semiconductor can provide complete solutions for two different architectures to fully meet the different needs of different customers.

ON Semiconductor Centralized and Distributed Door Control Module Solution

Figure 1: Two architectures for electronic door control design

Centralized Gating Module Solution

ON Semiconductor provides a wide range of automotive components for door control solutions: including automotive-grade low-dropout (LDO) power products, door locks, window lifts, rearview mirror adjustment motor drives, light bulbs, relay drives, automotive-grade intelligent FET, to stand-alone LIN transceivers, stand-alone CAN transceivers, FlexRay transceivers, and system-level basis chips (SBCs) covered in in-vehicle networking (IVN).

1)LDOproduct

LDO linear regulators for battery and post-regulation with standard/low quiescent current, high power supply rejection ratio (PSRR)/ultra-low quiescent current, and tracker and current sense functions. ON Semiconductor offers LDO products that fully support the characteristics of automotive applications including primary and secondary power supply. In the reference design based on ON Semiconductor’s automotive LDO, the quiescent current is 8µA~200µA, the output Voltage is 0.7V~10V, suitable for low ESR capacitors, and the output current is 100mA~3A.

ON Semiconductor Centralized and Distributed Door Control Module Solution

Figure 2: Reference Power Supply Design and Simulation Model

According to the different definitions of quiescent current Iq between battery power and load power supply, ON Semiconductor divides LDO products into four grades:

Ÿ Standard Iq LDO: 100µA

Ÿ Low Iq LDO: 50µA

Ÿ Ultra-low Iq LDO: 25µA

Ÿ Very low Iq LDO: Iq<25µA

NCV42xx and NCV85xx are devices with standard quiescent current Iq > 60 μA. As secondary power supplies, the NCV42xx devices are a family of rugged LDOs that offer multiple integrated features such as fault protection and thermal overload. The NCV85xx is a family of micropower LDOs offering 2.5 V, 3.3 V, 5 V, 8 V, and 10 V adjustable and fixed outputs in various thermally enhanced packages.

NCV86xx is compatible with standard quiescent current LDO pins, with extremely low quiescent current, up to 33 μA < Iq < 50 μA; NCV87xx has ultra-low quiescent current Iq < 33 μA, which is compatible with very low quiescent current LDO pins.

2) Motor drive products

The ON Semiconductor NCV7703 integrates three independent half-bridges that can be configured as high-side, low-side and H-bridges via standard SPI communication for automotive DC motor control applications. NCV7703 has extremely low quiescent current in sleep mode, only 1µA; the lowest operating voltage is 5V; 3 sets of high-side and low-side can be connected as half-bridge and H-bridge. Other features include compatibility with 5V and 3.3V systems; 0.5A continuous operating current (peak 1A), Rdson typical value of 0.8Ω; overvoltage, undervoltage lockout; fault feedback; 1.4A overcurrent threshold detection, selectable shutdown; 3A automatic shutdown limit; over temperature alarm and protection; ESD protection up to 6kV.

The NCV7707 is a power driver chip for an automotive body control system that controls the front door loads, and can control rearview mirror functions such as mirror position, heating and folding, including electric anti-dazzle rearview mirrors. In addition, it integrates the door lock and safety lock H-bridge driver and four-group lamp driver. Key features of the NCV7707 include an integrated PWM generator; can be used for electric anti-dazzle mirror control, ambient light adjustment, advanced short-circuit handling, and PWM for motor output. The added value includes PWM high flexibility; ambient light adjustment; fast electric anti-glare rearview mirror adjustment time; capable of driving high-power locks.

The control scheme of NCV7707 electric anti-dazzle rearview mirror is shown in Figure 3. Electric anti-dazzle is controlled by NCV7707, SPI controls electric anti-dazzle rearview mirror; integrates 6-bit DAC and brightness control logic; integrates discharge low-side;

ON Semiconductor Centralized and Distributed Door Control Module Solution

Figure 3: NCV7707 electric anti-dazzle rearview mirror control scheme

NCV7710 is an automotive body control system driver chip that integrates an H-bridge to control the door lock motor. The NCV7710 is controlled via 24-bit SPI and is a simplified version of the NCV7707. Key features of the NCV7710 include advanced short-circuit handling; PWM for motor output; and SPI interface for control and diagnostics. The added value is that it can drive high-power locks, and the hardware and software are compatible with NCV7707.

3)Light bulb/Relay Drive Products

NCV7608 is a general-purpose integrated driver. The integrated 8 sets of outputs can be used as high-side or low-side at will. Each channel can provide 350mA driving current, which can drive different types of motors and loads, such as light bulbs, LEDs and relays. The NCV7240 is an 8-channel low-side driver, each channel provides 600mA drive capability, the output is controlled by 16-bit SPI, and provides convenient fault reporting, including open circuit, short circuit, overload and over temperature. In addition, the outputs can be controlled in parallel through the INx pins, and a dedicated limp-home mode pin (LHI) enables OUT1-OUT4 while turning off OUT5-OUT8.

SmartFET is used for high/low side drive of external load. Automotive grade high/low side smart FET devices provided by ON Semiconductor include NCV8401A, NCV8402A, NCV8402AD, NCV8403A, NCV8405A, NCV8406A, NCV8408, NCV8440A and other low-side drivers, as well as NCV8450A, NCV8452, NCV8460A, NCV8461 and other high-side drivers. These devices feature protection MOSFETs with multiple protection features added to them.

4) Communication circuit products

The NCV7340-3 high-speed low-power CAN transceiver relies on the ISO11898-2 standard to connect the CAN controller to the CAN high-speed bus. The chip is ideal for larger networks, stabilizes the bus by using the Vsplit function, and can enter a low-power mode to reduce overall power consumption. Its key features include providing system-level ESD protection with a withstand voltage of ±12kV; the same functionality and performance as the AMIS42665; and improved EMI performance.

The NCV7425 is a System Basis Chip (SBC) that integrates a LIN v2.1 transceiver and LDO. It meets the requirements of high performance, reliability and low cost. It provides 3.3V and 5V output options and supports 150mA loads. Its added value is that it increases system reliability, reduces BOM and reduces cost compared to discrete components.

Decentralized Gating Module Solutions

ON Semiconductor has specially developed power stage driver chips NCV7462 and NCV7707 for distributed gate control modules. NCV7462 is a system basis chip that integrates CAN and LIN transceivers, 2 groups of LDOs, 2 groups of low-side relay drivers with op amps, and 5 groups of high-side drivers, which meet the requirements of high performance, reliability and low cost. The main feature of NCV7462 is that it is a highly integrated SBC device that integrates CAN/LIN transceivers, rectifiers, stable drivers, watchdogs and other functions, and can also bring added value to customers to increase system reliability. The NCV7707 is dedicated to controlling the front door loads, including mirror position, heating and folding, in addition to two sets of half bridges for controlling the lock motors, and four sets of high-side output drive bulbs.

ON Semiconductor Centralized and Distributed Door Control Module Solution

Figure 4: Schematic diagram of the decentralized gating module

The power stage chips NCV7462 and NCV7707 are directly powered by the battery, and the external circuit needs a reverse polarity protection circuit. The built-in LDOVR1 of the NCV7462 supplies power to the microprocessor uC. The microprocessor uC controls NCV7462 and NCV7707 through SPI communication, and reads its status information at the same time. These devices have provided perfect fault detection and protection functions, thus avoiding the use of too many discrete components, greatly reducing the size of the module, and improving the EMC (electromagnetic compatibility) characteristics of the module.

Figure 5: NCV7462 and NCV7707 highly integrated decentralized gating solution

Summarize

As a leading supplier of high-efficiency semiconductor solutions for automotive electronics, ON Semiconductor uses advanced technology and rich experience to provide customers with complete solutions and rich device selection for door design. Whether it is a centralized gated design or a decentralized design, ON Semiconductor can provide a variety of products, including power LDOs, different load drivers, transceiver products that meet different in-vehicle network protocols such as CAN, LIN, and FlexRay, and highly integrated functions. SBC chips, etc., provide a comprehensive guarantee to meet the different design needs of customers.

The Links:   QM200HA-H NL8048AC19-13BD

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