Z8F1680MM00MODG

Reference Design Control a Microstepper Motor with the Z8F1680 MCU RD000403-0814 Overview Zilog’s Z8F1680 MCU-based Microstepper Motor Reference Design is a complete and easy-to-use platform that demonstrates the features set of the Z8F1680 Microcontroller, which is optimized for microstepper motor control. This Microstepper Motor Reference Design drives a unipolar stepper motor using the Z8F1680 MCU’s onboard analog comparators for one-shot feedback current limiting. It also uses the Z8F1680 MCU’s multichannel timer as a microstepper sine/cosine current generator. The Microstepper Motor Reference Design, shown in Figure 1, is designed to be operated by either any battery or an external power supply of 5V DC to 12V DC. Figure 1. Zilog’s Microstepper Motor Reference Design Features The key features of the Microstepper Motor Reference Design are: • Stepper motor • Sine/cosine microstepping • Current limiting • Speed control • Directional control of the motor • One-step advancing of the motor • Current generator for each coil RD000403-0814 Page 1 of 9 Control a Microstepper Motor with the Z8F1680 MCU Reference Design Potential Applications The Microstepper Motor Reference Design can be used to develop a number of applications; a number of potential applications are listed below. • Precision surgical procedures • Motorized position camera • HVAC coolant control • Robotic arms for a factory production line • Robot controls • Valve control for a fluid control system • Motorized curtains or window cover controls • Laser or optical precision positioning equipment – Linear actuators – Linear stages – Goniometers – Mirror mounts • Packaging machinery • CD/DVD disk drives • Flatbed/image scanners • Computer printers • Plotters • Slot machines • Intelligent lighting • Retrieval or exploration/drilling machinery Discussion The Microstepper Motor Reference Design employs Zilog’s full-featured Z8F1680 MCU to receive user commands to drive a unipolar stepper motor. The Z8F1680 MCU’s multichannel timer is used as a microstepper sine/cosine current generator. Microstepping, or sine/cosine microstepping, is a stepper motor drive technique in which the current in the motor windings is controlled to approximate a sinusoidal waveform. Microstepping produces a much smoother rotation than that of a full step drive, plus it provides greater resolution and freedom from resonance problems because it involves more steps per revolution. RD000403-0814 Page 2 of 9 Control a Microstepper Motor with the Z8F1680 MCU Reference Design In a conventional full step drive, an equal amount of current is applied to each of a motor’s stator coils. The magnetic rotor aligns itself in the coil’s magnetic field. With each motor step, current is reversed in one of the coils, and the rotor realigns to the new magnetic field to move the rotor one motor step (i.e., 90 degrees). With microstepping, varying amounts of current are applied to a motor’s coils so that the magnetic field smoothly transitions from one polarity to the next. Each full step is divided into several microsteps of varying current to produce a larger number of magnetic fields that the rotor can align with. The result is a smoother motor rotation, quieter operation, and greater motor resolution. This reference design is a physical demonstration of this theory. To learn more, see the Z8 Encore! XP F1680 Microstepping Controller Application Note (AN0272), which is available free for download from the Zilog website. Principles of Operation The Microstepper Motor Reference Design offers the following control switches and buttons, which demonstrate the microstepping functions of a unipolar microstepper motor. ON/OFF Switch (SW4). This switch turns the power to the Microstepper Motor Reference Design Board either ON or OFF. SPEED Knob (R1). Rotate this knob counterclockwise to slow rotation, and clockwise to speed rotation if the motor is operating in Run Mode. RUN/STOP Button (SW1). A pushbutton toggle switch to allow a motor to run or to stop a motor from running. DIRECTION Button (SW2). A pushbutton toggle switch that allows a motor to rotate clockwise or counterclockwise if the motor is operating in Run Mode. STEP Button (SW3). A single push and release of this pushbutton switch allows the motor, when in Stop Mode, to take a single step in whichever direction the motor is currently rotating. Caution: The motor must first be stopped prior to using the STEP button; otherwise, damage may occur to the motor. Power Connector Jack (J5). A single 5VDC to 12VDC power supply can be connected to this jack to power the Microstepper Motor Reference Design. Power Terminal Block Connector (J1). An external 5VDC to 12VDC power supply can be connected to this terminal block to power the Microstepper Motor Reference Design. Terminal Block Connectors (J2, J3, J4). The microstepper motor’s wires are connected to the Microstepper Motor Reference Design through these terminal block connectors, as follows: • Connect the brown wire to J2-1 • Connect the green wire to J2-2 RD000403-0814 Page 3 of 9 Control a Microstepper Motor with the Z8F1680 MCU Reference Design • Connect the black wire to J3-1 • Connect the orange wire to J3-2 • Connect the red wire to J4-1 • Connect the yellow wire to J4-2 Testing Procedure Observe the following procedure to become familiar with the features of the Microstepper Motor Reference Design. 1. Switch ON/OFF SW4 to the OFF position. 2. Connect the 5V DC to 12V DC power supply to either Power Jack J5 or to Terminal Block J1. Ensure that the positive and negative connections from the power supply are connected to their corresponding terminal block connectors , both positive and negative. 3. Switch ON/OFF SW4 to the ON position. 4. Push the RUN/STOP button once. The microstepper motor will start to rotate. 5. Rotate the SPEED knob counterclockwise to slow the motor’s rotation. 6. Rotate the SPEED knob clockwise to accelerate the motor’s rotation. 7. Push the DIRECTION button once. The microstepper motor will immediately change the direction of its rotation. 8. Push the RUN/STOP button once. The microstepper motor will stop its rotation. 9. Push the STEP button once. The microstepper motor will advance one microstep in the direction in which it last rotated. Repeat this step a few times to observe this microstepping function. 10. Push the DIRECTION button once. The microstepper motor will change the direction of its rotation. 11. Push the STEP button once. The microstepper motor will advance one microstep in the new direction. Repeat this step a few times to observe this microstepping function. 12. Switch ON/OFF SW4 to the OFF position to conclude this test procedure. Electrical Specifications Table 1 presents the electrical specifications for the Microstepper Motor Reference Design. These specifications reflect all available data as a result of testing prior to qualification and characterization. Therefore, the data presented in this table are subject to change. Stresses greater than those listed in Table 1 may cause permanent damage to the device. These ratings are stress ratings only. Operation of the device at any condition outside RD000403-0814 Page 4 of 9 Control a Microstepper Motor with the Z8F1680 MCU Reference Design those indicated in the operational sections of these specifications is not implied. Exposure to absolute maximum rating conditions for extended periods affects device reliability. For improved reliability, unused inputs must be tied to one of the supply voltages (VDD or VSS). Table 1. Electrical Specifications for the Microstepper Motor Reference Design Parameter Min Max Units Notes Input power supply 5 12 Volts Applied on J1 or J5 connector Max voltage range, all other pins -0.3 5.5 Volts For Z8F1680: GPIO I/O pins and Reset. External Pull-ups are not enabled. Storage temperature 20 30 Degrees Celsius Ambient temperature 20 30 Degrees Celsius Packaging Figure 2 shows an assembly diagram of the Microstepper Motor Reference Design Board. Figure 2. Microstepper Motor Reference Design Board Assembly Diagram RD000403-0814 Page 5 of 9 Control a Microstepper Motor with the Z8F1680 MCU Reference Design Mechanical Profile Figure 3 shows top- and side-view dimensions of the Microstepper Motor Reference Design Board. Figure 3. Microstepper Motor Reference Design Board Dimensions Ordering Information The Microstepper Motor Reference Design is available as an individual board and as part of a kit, as shown in the Kit Contents section that follows. Both products can be ordered from the Zilog Store using the part numbers listed in Table 2. Table 2. Microstepper Motor Reference Design Ordering Information Part Number Description Store Product ID Z8F1680MM00MODG Microstepper Motor Design Board RD10031 Z8F1680MM00KITG Microstepper Motor Design Kit RD10032 Kit Contents The Microstepper Motor Reference Design Kit contains the following items: • Microstepper Motor Reference Design Board • Stepper Motor PF35T-48L4 • AC-5VDC Power Adapter RD000403-0814 Page 6 of 9 Control a Microstepper Motor with the Z8F1680 MCU Reference Design Related Documentation The documents associated with the Microstepper Motor Reference Design are listed in Table 3. Each of these documents can be obtained from the Zilog website by clicking the link associated with its document number. Table 3. Microstepper Motor Reference Design Documentation Document Number Description RD0004 This Microstepper Motor Reference Design document PS0250 Z8F1680 Series Product Specification UM0188 eZ8 CPU Core User Manual UM0181 USB SmartCable User Manual AN0272 Z8 Encore! XP F1680 Microstepping Controller Application Note AN0272-SC01 Source code for Z8 Encore! XP Z8F1680 Microstepping Controller Application Note RD000403-0814 Page 7 of 9 Control a Microstepper Motor with the Z8F1680 MCU Reference Design Appendix A. Schematic Diagrams Figure 4 presents a schematic diagram of the Microstepper Motor Reference Design. J1 VIN 5-12V 2 1 5V VR1 REG1117-3.3 3 D1 1N4004 1 + C9 .1uF Vin C8 10uF 10V 3.3V GND SW4 POWER 2 Vout Vout C1 .1uF + C2 10uF 10V TP1 GND J5 1 3 2 C3 6V 3.3V SPEED .1uF R5 1K R4 11K 1K C4 10nF PWMB R7 11K 1K PA2/DE0/X2IN PA3/CTS0/X2OUT PE3/T4CHA PD6/DE1 PA4/RXD0/IRRX0 PA5/TXD0/IRTX0 PD5/TXD1/IRTX1 PA6/T1IN/T1OUT PC4/MOSI/LED PC5/SCK/LED PA7/T1OUT C5 10nF PE5/T4CHC PB3/CLKIN/ANA3 PB5/VREF PB4/ANA7 PB2/AMPINP/ANA2 PB1/AMPINN/ANA1 PB0/AMPOUT/ANA0 PD1/C1INN PD2/C1INP PC3/MISO/LED PC2/SS/ANA6/LED 1K RUN/STOP DIRECTION STEP P/B P/B P/B SW1 SW2 R9 10K R10 1K 10K R11 R12 3.3V FDV303N Q1 FDV303N Q2 1.0 1W R13 10K 1 3 5 P1 3.3V RST GND DBG GND NC DEBUG CONN 2 4 6 R16 10K D2 1N4002 D3 1N4002 FDV303N Q3 R14 R15 10K 5V PHASE A C6 10nF 3.3V SW3 33 32 31 30 29 28 27 26 25 24 23 12 13 14 15 16 17 18 19 20 21 22 R8 1K R6 1 2 3 4 5 6 7 8 9 10 11 PD7/COUT0 PE2/SDA PE1/SCL AVSS VSS2 PA1/T0OUT/XOUT PA0/T0IN/T0OUT/XIN VDD2 AVDD PE0/T4IN PE6/T4CHD R3 R1 10K R2 PD4/RXD1/IRRX1 PC6/T2IN/T2OUT/LED PC7/T2OUT/LED VDD1 PD0/RESET DBG PD3/CTS1/COUT1 VSS1 PE4/T4CHB PC0/ANA4/C0INP/LED PC1/ANA5/C0INN/LED PWMA 44 43 42 41 40 39 38 37 36 35 34 U1 Z8F1680AN020SG 3.3V D4 1N4002 1.0 1W C7 10nF R17 10K R18 1K FDV303N Q4 STEPPER MOTOR 1 2 3 4 5 6 2 1 2 1 2 1 J2 J3 J4 D5 1N4002 PHASE B Figure 4. A Schematic Diagram of the Microstepper Motor Reference Design RD000403-0814 Page 8 of 9 Control a Microstepper Motor with the Z8F1680 MCU Reference Design Customer Support To share comments, get your technical questions answered, or report issues you may be experiencing with our products, please visit Zilog’s Technical Support page at  http://support.zilog.com. To learn more about this product, find additional documentation, or to discover other facets about Zilog product offerings, please visit the Zilog Knowledge Base at http:// zilog.com/kb or consider participating in the Zilog Forum at http://zilog.com/forum. This publication is subject to replacement by a later edition. To determine whether a later edition exists, please visit the Zilog website at http://www.zilog.com. Warning: DO NOT USE THIS PRODUCT IN LIFE SUPPORT SYSTEMS. LIFE SUPPORT POLICY ZILOG’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS PRIOR WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF ZILOG CORPORATION. As used herein Life support devices or systems are devices which (a) are intended for surgical implant into the body, or (b) support or sustain life and whose failure to perform when properly used in accordance with instructions for use provided in the labeling can be reasonably expected to result in a significant injury to the user. A critical component is any component in a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system or to affect its safety or effectiveness. Document Disclaimer ©2014 Zilog, Inc. All rights reserved. Information in this publication concerning the devices, applications, or technology described is intended to suggest possible uses and may be superseded. ZILOG, INC. DOES NOT ASSUME LIABILITY FOR OR PROVIDE A REPRESENTATION OF ACCURACY OF THE INFORMATION, DEVICES, OR TECHNOLOGY DESCRIBED IN THIS DOCUMENT. ZILOG ALSO DOES NOT ASSUME LIABILITY FOR INTELLECTUAL PROPERTY INFRINGEMENT RELATED IN ANY MANNER TO USE OF INFORMATION, DEVICES, OR TECHNOLOGY DESCRIBED HEREIN OR OTHERWISE. The information contained within this document has been verified according to the general principles of electrical and mechanical engineering. Z8 Encore! XP is a trademark or registered trademark of Zilog, Inc. All other product or service names are the property of their respective owners. RD000403-0814 Page 9 of 9