Tuesday, July 23, 2024

STSPIN32G4, The first motor controller with an built-in MCU solves 2 main challenges

STSPIN32G4, The first motor controller with an built-in MCU solves 2 main challenges

Creator: STMicroelectronics

The STSPIN32G4 integrates a three-phase gate driver, an STM32G431, and an influence administration system beneath one package deal to unravel main engineering challenges, thus enabling new purposes. Whereas ST continues to supply STSPIN motor drivers, we additionally realized that engineers nonetheless face a number of conundrums. Designers need to run extra highly effective purposes however should additionally shrink their PCBs and cut back prices. Equally, purposes demand extra effectivity, however bettering it by a couple of decimal share factors stays a wrestle. ST engineers thus launched the STSPIN32G4 as a result of no different built-in motor controller provided such a strong mainstream MCU and such a versatile energy administration system.

STSPIN32G4 and the primary problem: How you can make issues extra highly effective in a smaller design?

Extra energy beneath one roof


Let’s take the instance of an engineer engaged on a high-end vacuum cleaner with a high-speed motor. The MCU contained in the STSPIN32G4 will stand out, on this occasion, due to its computational throughput. A lower-performance CPU core means a decrease conversion price when designing a field-oriented management (FOC) sensorless software. The engineer within the vacuum cleaner instance must use two or three shunt resistors to compensate for the MCU’s decrease efficiency. Then again, the higher computational throughput means a single shunt is ample. Consequently, utilizing the STSPIN32G4 allows the creation of a strong software with fewer elements.

Extra peripherals in a single gadget

A crew engaged on a collaborative robotic or a guided automobile would additionally respect the MCU within the STSPIN32G4 for causes apart from the bump in DMIPS. On this occasion, engineers should drive two units of wheels, however conventional motor controllers don’t have sufficient analog-to-digital converters to deal with such a job. Consequently, engineers find yourself utilizing two motor drivers. The STSPIN32G4 is exclusive as a result of it offers two units of PWM timers and 12-bit ADCs, amongst different issues. It, subsequently, turns into potential to drive two motors with only one built-in gadget.

Saving 65% area

Whereas it’s inconceivable to enumerate all of the options within the STSPIN32G4, the fact is that its built-in nature is among the greatest methods to unravel the area problem. Motor management purposes are more and more smaller, whether or not for comfort, prices, or to face out higher. Because of its built-in nature, the STSPIN32G4 helps cut back the general design dimension by 65% in comparison with discrete options. Virtually, it permits engineers to place the management system in the back of the motor and design a a lot smaller e-bike, vacuum cleaner, or energy software, amongst different issues.

STSPIN32G4 and the second problem: how one can make issues extra vitality environment friendly whereas holding prices down?

A extra environment friendly energy administration

Based on our benchmarks, utilizing the brand new gadget lowers the general energy consumption by 3% to five% in comparison with a system that makes use of exterior elements. A saving of only a single % already has a major impression. ST supplied such energy effectivity by bringing the standard standby consumption to solely 15 µA due to a really low-quiescent regulator. Therefore, we anticipate engineers to create considerably extra compact designs while not having an exterior cooling system, thus decreasing the BoM.

The motor controller additionally helps a provide voltage of as much as 75 V, in comparison with solely 48 V beforehand. Moreover, the STSPIN32G4 comes with an over-current safety mechanism and a drain-source voltage (VDS) monitoring system that acts as a redundancy. It displays the exterior MOSFETs and turns all gate driver outputs off if it detects an over-voltage situation. Consequently, we anticipate engineers to make use of the STSPIN32G4 in home equipment. Certainly, a white good linked to a grid usually suffers from vast voltage variations from the mains. The higher provide voltage vary and safety options of the brand new gadget will higher deal with these irregular circumstances.

A extra versatile energy administration

Engineers typically draw back from built-in options, fearing they might limit their optimization capabilities. Therefore, ST ensured a excessive stage of customization. As an illustration, builders can program registers via an I2C interface to make use of the STSPIN32G4’s VCC buck converter. Furthermore, we revealed an software be aware exhibiting how one can use the buck regulator in a buck-boost configuration by including a couple of exterior elements. Lastly, engineers can bypass the buck and LDO regulators to depend on solely an exterior Vcc provide.

Groups that designed a extremely exact energy provide to satisfy the stringent necessities of their software can, thus, ignore the STSPIN32G4 regulators. In distinction, others can simplify their designs by utilizing its VCC buck converter to energy a couple of exterior elements, like a reminiscence module. Equally, builders can select to allow or disable the standby mode. Such a characteristic is significant for merchandise like energy instruments. When customers choose a drill after months and even years, they need to use it instantly. In such a case, engineers will need to utterly disconnect their system from the battery to maximise its utilization.

Engineers additionally get much more flexibility in how they drive a motor. They might use a 6-step driver circuit or a field-oriented management, each with or with no sensor and with one, two, and even three shunts. It provides builders the flexibility to regulate how a lot measurement information they collect. Consequently, it additionally turns into potential to qualify an STSPIN32G4 and use it in many various purposes, which may help an organization shorten its time to market and optimize its operations.

How you can get began


ST launched two improvement boards to allow groups to check and experiment with the STSPIN32G4. The EVSPIN32G4 makes use of STL110N10F7 energy MOSFETs and a warmth sink to permit an output present of as much as 20 A RMS. Consequently, groups can push the brand new units to develop extra highly effective designs. Nonetheless, ST can also be conscious that not each designer will use the STSPIN32G4 in high-powered techniques. Therefore, we’re additionally launching the EVSPIN32G4NH, an identical improvement board with out passive cooling; NH on the finish of the nomenclature stands for “no warmth sink”. We additionally up to date the X-CUBE-MCSDK to assist the brand new boards and units.


Extra just lately, our groups launched two reference designs. The EVLSPIN32G4-ACT drives a three-phase brushless motor supporting as much as 5 ARMS and might handle a provide enter of 48 V for a shocking 250 W whole energy in a board measuring solely 62 mm x 50 mm. Moreover, it may well hook up with the STWIN.field (STEVAL-STWINBX1) to quickly create a high-speed information logger. Because of our FP-IND-DATALOGMC software program pack and Fast Begin Information, engineers have a step-by-step course of to attach each boards and run purposes that may collect information from the sensors on the STWIN.field and the motor itself. We even supply a GUI to assist visualize the knowledge.


The opposite board is the EVSPIN32G4-DUAL, which mixes the STSPIN32G4 and the STDRIVE101, a triple half-bridge gate driver. Consequently, the board can drive two three-phase brushless motors for as much as 10 ARMS output present and a provide of 74 V thanks to 2 energy levels. Because of the operational amplifiers of the STSPIN32G4, it’s potential to have a sensor-less system with a single shunt present sensing or use Corridor sensors and encoders with the embedded MCU. Put merely, the reference design reveals how one can create a strong twin motor software in a small issue for residence home equipment, e-mobility, pumps, instruments, and extra.

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