Unlock the potential of H-bridge motor control with MPC17510 and STM32F091RC

H-Bridge 2 Click is based on the MPC17510, an H-Bridge DC motor driver with up to 15V and 1.2A from NXP Semiconductors. This IC is an efficient integrated H-bridge driver with very low RDS ON output stage MOSFETs. H-bridge, in general, allows the current to flow in one or another direction. To achieve this, a special network of four output MOSFETs is used so that only two conduct the current through the source. Switching the MOSFET pairs' biasing allows current to flow in both directions. A particular problem can be the simultaneous switching of all MOSFETs, which results in short-circuit through a pair of MOSFETs. This leads to the destruction of the IC. The MPC17510 employs cross-conduction suppression timings and logic to prevent this, ensuring that only one pair of MOSFETs is conducted at a time. Suppose the input voltage of either the logic section or the power section drops under the detection threshold. In that case, the H-Bridge 2 click outputs will become tri-stated, meaning that the outputs will be put into a high impedance mode (disconnected). The onboard jumper labeled VIN SEL allows selection between the mikroBUS™ power rail (selected by another jumper, labeled as VCC SEL) and the external voltage input (up to 15V) from the VIN screw terminal. It should be noted that the mikroBUS™ only allows enough power for light loads (smaller

motors); thus, the external voltage input should be selected when working with heavier loads. H-Bridge 2 Click is controlled via several pins. The EN pin of the MPC17510 is routed to the CS pin of the mikroBUS™, which is labeled as END on the Click board™. When set to a HIGH logic level, this pin enables the IC itself. Pulling this pin to a LOW logic state will make both low-side MOSFETs biased and conductive, performing the dynamic motor braking. The pin is pulled up internally, so the IC will be enabled, even if the END pin is left afloat. The #GIN pin is used to drive the gate of the external MOSFET. This pin is routed to the AN pin of the mikroBUS™, labeled as the GIN. The Click board™ can drive an external MOSFET, which can be used as an auxiliary switch for controlling either another small motor or some other type of load, with up to 15V and no more than 200mA of continuous current. When the #GIN pin is driven to a LOW logic level, the external MOSFET becomes biased and conductive, allowing current to flow through a load connected between the S1 and S2 inputs of the onboard screw terminal. This pin is also pulled up internally so that the external MOSFET is not conducive if this pin is left afloat. PWM and RST pins of the mikroBUS™, labeled as PWM and DIR on the Click board™, are routed to the 74LVC1G3157, a two-channel analog multiplexer/demultiplexer IC, from Nexperia.

This IC routes the PWM signal from the MCU to either IN1 or IN2 inputs of the MPC17510 IC. The 74LVC1G3157 IC is driven by a logic state applied to the DIR pin: when the DIR is set to a HIGH logic level, the PWM signal will be routed from the PWM pin to the IN2 input pin of the MPC17510 IC. Else, the PWM signal will be routed to the IN1 input pin of the MPC17510 IC. Depending on the PWM signal path, the motor will rotate either in a clockwise or counter-clockwise direction, with speed determined by the pulse width ratio of the applied PWM signal. This way, the rotation direction is controlled by a logic state applied to the DIR pin, while the motor rotation speed is controlled by the PWM pulse ratio applied to the PWM pin. The PWM signal frequency should stay below 200kHz. Besides the VIN SEL and the VCC SEL jumpers, the Click board™ also has three screw terminals used to connect external voltage (VIN, GND), auxiliary load (S1, S2), and main load, motor (M1, M2). These terminals ensure the necessary conductors' simple, firm, and secure connection. The H-Bridge 2 click comes with a mikroC, mikroBASIC, and mikroPASCAL compilers compatible library, which contains functions for easy and simple operation of this Click board™. The provided example application demonstrates their usage and can be used as a reference for custom projects.

Nucleo-64 with STM32F091RC MCU offers a cost-effective and adaptable platform for developers to explore new ideas and prototype their designs. This board harnesses the versatility of the STM32 microcontroller, enabling users to select the optimal balance of performance and power consumption for their projects. It accommodates the STM32 microcontroller in the LQFP64 package and includes essential components such as a user LED, which doubles as an ARDUINO® signal, alongside user and reset push-buttons, and a 32.768kHz crystal oscillator for precise timing operations. Designed with expansion and flexibility in mind, the Nucleo-64 board features an ARDUINO® Uno V3 expansion connector and ST morpho extension pin

headers, granting complete access to the STM32's I/Os for comprehensive project integration. Power supply options are adaptable, supporting ST-LINK USB VBUS or external power sources, ensuring adaptability in various development environments. The board also has an on-board ST-LINK debugger/programmer with USB re-enumeration capability, simplifying the programming and debugging process. Moreover, the board is designed to simplify advanced development with its external SMPS for efficient Vcore logic supply, support for USB Device full speed or USB SNK/UFP full speed, and built-in cryptographic features, enhancing both the power efficiency and security of projects. Additional connectivity is

provided through dedicated connectors for external SMPS experimentation, a USB connector for the ST-LINK, and a MIPI® debug connector, expanding the possibilities for hardware interfacing and experimentation. Developers will find extensive support through comprehensive free software libraries and examples, courtesy of the STM32Cube MCU Package. This, combined with compatibility with a wide array of Integrated Development Environments (IDEs), including IAR Embedded Workbench®, MDK-ARM, and STM32CubeIDE, ensures a smooth and efficient development experience, allowing users to fully leverage the capabilities of the Nucleo-64 board in their projects.