Renesas Electronics Corporation
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Mini BLDC Servo

Overview

The growing presence of robotic systems has increased the demand for small, precise, and cost-efficient BLDC servo applications. This trend drives higher integration, combining motor control with position sensing to enable advanced control algorithms. The system offers a low-power servo implementation capable of driving up to 75W BLDC motors with precise position control.

System Benefits:

  • Flash-based MCU for reliable and efficient operation
  • Optional interfaces tailored to system requirements
  • Support for multiple control algorithms
  • High-accuracy speed control for precision applications
  • Low parts count for cost-effective designs

Block Diagram

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4:3 ratio Connector Arrow.29 Connected signals line.110 Connector Line.65 Sheet.1 Sheet.2 Sheet.3 Sheet.4 WS120 WS120 WS120 HVPAK HVPAK HVPAK Connector 2 Resistor - Fixed Ground Sheet.24 Sheet.25 Connector Arrow Connected signals arrow Connector Arrow.28 Connected signals arrow.30 Bi-directional Sheet.32 Rectangle Circle.130 Circle.131 Line.132 Line.134 Bi-directional.38 Sheet.39 Rectangle Circle.130 Circle.131 Line.132 Line.134 RS-485 RS-485 RS-485 Bi-directional.46 Bi-directional.47 Vertical Wire Bundle 2 2 2 Sheet.50 Vertical Wire Bundle.51 2 2 2 Sheet.53 Vertical Wire Bundle.54 3 3 3 Sheet.56 Sheet.57 Rectangle Circle.130 Circle.131 Line.132 Line.134 Resistor - Fixed.63 Connector Line Connector Line.66 Ground.67 Sheet.68 Sheet.69 Resistor - Fixed.70 Connected signals line Connected signals line.72 Capacitor Non-polarized Sheet.84 Sheet.85 Sheet.86 Sheet.87 Connected signals line.88 Ground.89 Sheet.90 Sheet.91 Digital Control/Position Digital Control/Position Digital Control/Position 3.3V 3.3V 3.3V 3.3V 3.3V 3.3V 24V 24V 24V Vertical Wire Bundle.96 6 6 6 Sheet.98 Vertical Wire Bundle.99 2 2 2 Sheet.101 IPS IPS IPS Bi-directional.103 Vertical Wire Bundle.104 3 3 3 Sheet.106 Connector Arrow.107 Resistor - Fixed.108 Connector Line.109 High-Speed UART ABI and Step/Dir High-Speed UART ABI and Step/Dir High-Speed UARTABI and Step/Dir BLDC Motor Square.40 Inductor.10 Sheet.115 Sheet.116 Sheet.117 Inductor.14 Sheet.119 Sheet.120 Sheet.121 Inductor.18 Sheet.123 Sheet.124 Sheet.125 Dynamic connector Dynamic connector.27 Dynamic connector.25 Square Sheet.130 Square.41 Sheet.132 Sheet.133 Sheet.134 Ground.135 Sheet.136 Sheet.137 Connector Arrow.138 Vertical Wire Bundle.139 3 3 3 Sheet.141 PWM / 0-10V Analog Control PWM / 0-10V Analog Control PWM / 0-10V Analog Control 3.3V 3.3V 3.3V DC/DC Buck DC/DC Buck DC/DC Buck Sheet.144 MCU MCU MCU Vdd Vdd Vdd SCI/I2C SCI/I2C SCI/I2C I2C I2C I2C UART UART UART ADC ADC ADC PWM PWM PWM SCI/GPIO SCI/GPIO SCI/GPIO ADC ADC ADC

MCU

RA Arm Cortex-M MCUs

DC/DC Buck

Buck Regulators (Integrated FETs)

RS-485

RS-485/422 with Enhanced ESD Protection