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Aiwei Electronics launches multi-channel half-bridge driver chips for industrial applications.

Date：2024-11-04
The rapid development of automation and intelligence in the industrial sector has driven the widespread application of multi-channel half-bridge driver chips in areas such as DC motors, LEDs, relays, and high/low-side driver domain controllers. To meet the above requirements for domain control applications, AWINIC has launched the AWD89XX series of multi-channel half-bridge driver chips. This series integrates up to 12 half-bridges, each equipped with independent overcurrent and overvoltage protection, as well as SPI diagnostic functionality, making it a highly integrated, intelligent, safe, and efficient driver IC solution. This series not only addresses market demands for high performance, low cost, compact size, high safety, and diverse functionality but also promotes the self-reliance of the industrial chain and advances the development of critical core technologies.
 
Product Overview
 
The AWD89XX series of multi-channel half-bridge driver chips offers multiple half-bridge output options. Various load configurations, such as single half-bridge, H-bridge, and parallel half-bridge, enable a wide range of load current applications. This solution has been applied in scenarios such as DC motors, digital output modules for industrial bus distributed I/O, indicator lights, alarm lights, and relay drivers.
  • Supply voltage range: 4.5V~32V
  • Low power consumption mode
  • Compatible with 5V/3.3V power supply systems
  • Supports 5MHz SPI communication
  • Supports daisy-chain communication
  • Built-in PWM generator with output frequencies of 80Hz, 100Hz, 200Hz, 400Hz, 800Hz, and 2kHz, with 8-bit duty cycle resolution
  • Integrated protection: overcurrent protection, short-circuit protection, open-load detection, undervoltage protection, overvoltage protection, and overtemperature protection
  • Package: WBTSSOP-24L 7.8mm×4.4mm×1.2mm
Features ——SPI Communication Interface
 
The AWD89XX series of multi-channel half-bridge driver chips features a 16-bit serial communication interface (SPI) with daisy-chain functionality, supporting a communication frequency of 5MHz for efficient configuration and diagnostics.
Multi-slave parallel application schematic

Figure 1: Multi-slave parallel application schematic
Daisy-chain cascading application schematic

Figure 2: Daisy-chain cascading application schematic

Application Scenarios 

1. Half-Bridge Driver Applications

Half-bridge output application with simultaneous output waveforms from 3 built-in PWM generators

Figure 3: Half-bridge output application with simultaneous output waveforms from 3 built-in PWM generators

2. High-Side Driver Applications

Figure 4: High-side driver application and voltage rising edge waveform of high-side output

3. Low-Side Driver Applications
Low-side driver application and voltage falling edge waveform of low-side output

Figure 5: Low-side driver application and voltage falling edge waveform of low-side output

4. Multi-Half-Bridge Parallel Applications
Multi-channel half-bridge parallel application driving BDC motor startup, operation, and stop output voltage and current waveforms

Figure 6: Multi-channel half-bridge parallel application driving BDC motor startup, operation, and stop output voltage and current waveforms

5. Massage Chair Airbag Valve Applications

The SPI daisy-chain topology efficiently connects air valve driver units across different zones of a massage chair, enhancing modular design, simplifying maintenance and upgrades, significantly reducing system EMI, and delivering an intelligent, efficient, and low-interference comfortable experience.
Massage chair schematic

Figure 7: Massage chair schematic

6. Industrial Bus Distributed I/O Applications

In the design of blade-style I/O modules, the SPI interface-based multi-channel half-bridge technology not only optimizes circuit layout for compact structures but also significantly enhances product reliability. This design allows each digital output port to be conveniently configured as PNP or NPN output based on specific application requirements, increasing module flexibility.

7. High-Definition Smart Dome Camera Applications

In the construction of high-definition network dome cameras, a single SPI interface 8-channel half-bridge is used to drive two stepper motors, controlling the horizontal and vertical rotation of the gimbal, enabling flexible two-dimensional adjustment of the surveillance view. The SPI interface design not only optimizes data transmission efficiency but also significantly reduces the number of I/O ports required, simplifying system wiring and reducing overall design complexity. 

High-definition smart dome camera schematic

Figure 8: High-definition smart dome camera schematic

8. Extended Applications

With up to 12 independently controllable half-bridges, the AWD89XX chip demonstrates exceptional flexibility and scalability. Each half-bridge's upper and lower transistors can be independently controlled, allowing the formation of multiple H-bridge circuits or flexible configurations as 12 high-side or low-side drivers. Additionally, multiple half-bridges can be paralleled to increase current capacity, breaking the limitations of traditional solutions and providing unprecedented freedom for designers. This is particularly beneficial in domain control scenarios, meeting the demand for a large number of high-side or low-side drivers.

Conclusion

The highly integrated design of the AWD89XX series offers significant advantages, providing up to 12 high-side or low-side drivers on a single chip. It also incorporates comprehensive protection mechanisms, including overcurrent, overvoltage, undervoltage, and overtemperature protections. Combined with SPI communication fault diagnosis and reporting mechanisms, it lays a solid foundation for system-level functional safety.

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