32-bit MCUs Optimized for Motor Control in Robotics and More

Renesas Electronics has unveiled the RX66T Group of microcontrollers (MCUs). The chips are the first members of Renesas’ flagship 32-bit RX MCU family based on the new third-generation RXv3 CPU core. The new MCUs leverage advanced CPU core technology to achieve substantially improved performance, as much as 2.5 times better than previous RX family MCUs.

Combining the powerful new RXv3 core with the strengths of the current RX62T and RX63T MCUs, the new RX66T MCUs address the real-time performance and enhanced stability required by inverter control. The new MCUs are ideal for use in industrial applications in next-generation smart factory equipment, such as industrial motors, power conditioners and robots, as well as smart home appliances, including air conditioners and washing machines.
When operating at 160 MHz, the RX66T MCUs achieve best-in-class performance of 928 CoreMark 2, enabling more precise inverter control. The MCUs can control up to four motors simultaneously, making them well-suited for conventional motor control and applications requiring multi-axis motor control, such as compact industrial robots and personal robots, which are quickly growing in popularity.

In addition, the RX66T’s extra processing capacity allows developers to add programs utilizing embedded AI (e-AI) for motor fault detection. Such programs can detect motor faults and identify fault location in real time based on the motor’s current or vibration characteristics. Providing this capability offers developers the significant value-add of productivity, safety, and quality. The RX66T MCUs also integrate a 5V power supply that delivers excellent noise tolerance.

With more and more devices ranging from robots and power conditioners to washers and dryers joining the Internet of Things, motorized devices in the field will require online firmware updates throughout their life cycles. Applying e-AI for predictive failure diagnostics requires endpoint MCUs to be securely updated with learning results generated in the cloud. The RX66T MCU Group incorporates Renesas’ Trusted Secure IP (TSIP), which has a track record of CAVP certification3 and provides secure firmware updates and encrypted communication.

Key Features of the RX66T MCU Group:

  • Supports inverter control with a maximum operating frequency of 160 MHz, 928 CoreMark, on-chip floating point-unit (FPU), and 5V power supply
  • High-speed flash memory with 120 MHz maximum read operation to reduce speed differential with the CPU and realize both high performance and a consistent execution
  • Reduces footprint and component count by generating three-phase complementary pulse width modulation (PWM) output for up to four motors using 112-pin and 144-pin package MCUs, and up to three motors using 64-pin, 80-pin and 100-pin package MCUs
  • Configurations available with 16 KB of error correction code (ECC) SRAM, and up to 128 KB of SRAM with single-cycle access and single-bit error detection (parity checking) for high reliability
  • Ability to generate high-resolution PWM signals with a minimum state change duration of 195 picoseconds (1.6 times better than existing RX products) for power conditioner or digital power supply control applications
  • Renesas’ Trusted Secure IP (TSIP) provides secure firmware updates and encrypted communication with a track record of CAVP certification

The Renesas Motor Workbench 2.0 supports 20kHz real-time debugging and adds 10 new functions and an RX66T CPU card for the 24V Motor Control Evaluation Kit are available now.

The new RX66T Group comprises 80 MCUs with pin counts ranging from 64 to 144 pins and on-chip flash memory sizes of 256 KB to 1,024 KB. Mass production starts today for the widely used 100-pin package MCU with 256 KB or 512 KB of program flash and 64 KB of SRAM. Other MCU versions will release over time. Pricing for the RX66T MCU Group starts at $3.25 per unit in 10,000-unit quantities.

Renesas Electronics | www.renesas.com

Full-Bridge 600V/3.5A Power Driver Features SiP Format

STMicroelectronics’ has released its PWD5F60 high-density power driver, the second in a new series of power-driver systems-in-package addressing high-voltage brushed DC and single-phase brushless motor applications. It integrates a 600V/3.5A single-phase MOSFET bridge with gate drivers, bootstrap diodes, protection features, and two comparators in a 15 mm x 7 mm outline. The thermally efficient system-in-package occupies 60% less board real-estate than discrete components, while boosting reliability and simplifying design and assembly.

As a single-phase full-bridge module, the PWD5F60 is tailored for driving brushed DC motors in applications such as industrial pumps and fans, blowers, domestic appliances, and factory-automation systems. It is particularly targeted at the appliances using single-phase brushless motors that guarantee high durability and efficiency at a reasonable cost. It is also cost-effective and convenient for use in power supply units.

With on-resistance of 1.3 8Ω, the PWD5F60’s integrated N-channel MOSFETs ensure high efficiency for handling medium-power loads. The gate drivers are optimized for reliable switching and low EMI (electromagnetic interference), while the integrated bootstrap diodes enable high-voltage startup with no need for external diodes and passive components to supply the high-side inputs.

Flexibility is assured by two embedded uncommitted comparators that allow an easy implementation of peak current control or over-current and over-temperature protection features. The peak-current control used in conjunction with positioning Hall-effect sensors allows to achieve a stand-alone controller with no need of a dedicated MCU and hence drastically reducing the cost of control electronics. Further flexible features include adjustable dead-time and the option to configure the MOSFETs as a single full bridge or two half bridges. Operating voltage range extends from 10 V to 20 V and inputs are compatible with 3.3 V-15 V control signals to ease interfacing with Hall sensors or a host microcontroller or DSP

Cross-conduction prevention and under-voltage lockout are already built-in to protect the device by preventing operation in low-efficiency or dangerous conditions. The PWD5F60 is in production and available now, packaged as a multi-island VFQFPN device, from $2.15 for orders of 1,000 pieces.

STMicroelectronics | www.st.com